*/
#include "avformat.h"
-AVInputFormat *first_iformat;
-AVOutputFormat *first_oformat;
-AVImageFormat *first_image_format;
+#undef NDEBUG
+#include <assert.h>
+
+/**
+ * @file libavformat/utils.c
+ * Various utility functions for using ffmpeg library.
+ */
+
+/** head of registered input format linked list. */
+AVInputFormat *first_iformat = NULL;
+/** head of registered output format linked list. */
+AVOutputFormat *first_oformat = NULL;
+/** head of registered image format linked list. */
+AVImageFormat *first_image_format = NULL;
void av_register_input_format(AVInputFormat *format)
{
const char *ext, *p;
char ext1[32], *q;
+ if(!filename)
+ return 0;
+
ext = strrchr(filename, '.');
if (ext) {
ext++;
p = extensions;
for(;;) {
q = ext1;
- while (*p != '\0' && *p != ',')
+ while (*p != '\0' && *p != ',' && q-ext1<sizeof(ext1)-1)
*q++ = *p++;
*q = '\0';
if (!strcasecmp(ext1, ext))
int score_max, score;
/* specific test for image sequences */
+ if (!short_name && filename &&
+ filename_number_test(filename) >= 0 &&
+ av_guess_image2_codec(filename) != CODEC_ID_NONE) {
+ return guess_format("image2", NULL, NULL);
+ }
if (!short_name && filename &&
filename_number_test(filename) >= 0 &&
guess_image_format(filename)) {
return fmt;
}
+/**
+ * Guesses the codec id based upon muxer and filename.
+ */
+enum CodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
+ const char *filename, const char *mime_type, enum CodecType type){
+ if(type == CODEC_TYPE_VIDEO){
+ enum CodecID codec_id= CODEC_ID_NONE;
+
+ if(!strcmp(fmt->name, "image2") || !strcmp(fmt->name, "image2pipe")){
+ codec_id= av_guess_image2_codec(filename);
+ }
+ if(codec_id == CODEC_ID_NONE)
+ codec_id= fmt->video_codec;
+ return codec_id;
+ }else if(type == CODEC_TYPE_AUDIO)
+ return fmt->audio_codec;
+ else
+ return CODEC_ID_NONE;
+}
+
+/**
+ * finds AVInputFormat based on input format's short name.
+ */
AVInputFormat *av_find_input_format(const char *short_name)
{
AVInputFormat *fmt;
/* memory handling */
/**
- * Default packet destructor
+ * Default packet destructor.
*/
-static void av_destruct_packet(AVPacket *pkt)
+void av_destruct_packet(AVPacket *pkt)
{
av_free(pkt->data);
pkt->data = NULL; pkt->size = 0;
*/
int av_new_packet(AVPacket *pkt, int size)
{
- void *data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
+ void *data;
+ if((unsigned)size > (unsigned)size + FF_INPUT_BUFFER_PADDING_SIZE)
+ return AVERROR_NOMEM;
+ data = av_malloc(size + FF_INPUT_BUFFER_PADDING_SIZE);
if (!data)
return AVERROR_NOMEM;
memset(data + size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
return 0;
}
+/**
+ * Allocate and read the payload of a packet and intialized its fields to default values.
+ *
+ * @param pkt packet
+ * @param size wanted payload size
+ * @return >0 (read size) if OK. AVERROR_xxx otherwise.
+ */
+int av_get_packet(ByteIOContext *s, AVPacket *pkt, int size)
+{
+ int ret= av_new_packet(pkt, size);
+
+ if(ret<0)
+ return ret;
+
+ pkt->pos= url_ftell(s);
+
+ ret= get_buffer(s, pkt->data, size);
+ if(ret<=0)
+ av_free_packet(pkt);
+ else
+ pkt->size= ret;
+
+ return ret;
+}
+
+/* This is a hack - the packet memory allocation stuff is broken. The
+ packet is allocated if it was not really allocated */
+int av_dup_packet(AVPacket *pkt)
+{
+ if (pkt->destruct != av_destruct_packet) {
+ uint8_t *data;
+ /* we duplicate the packet and don't forget to put the padding
+ again */
+ if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
+ return AVERROR_NOMEM;
+ data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
+ if (!data) {
+ return AVERROR_NOMEM;
+ }
+ memcpy(data, pkt->data, pkt->size);
+ memset(data + pkt->size, 0, FF_INPUT_BUFFER_PADDING_SIZE);
+ pkt->data = data;
+ pkt->destruct = av_destruct_packet;
+ }
+ return 0;
+}
+
/* fifo handling */
int fifo_init(FifoBuffer *f, int size)
int fifo_size(FifoBuffer *f, uint8_t *rptr)
{
int size;
+
+ if(!rptr)
+ rptr= f->rptr;
if (f->wptr >= rptr) {
size = f->wptr - rptr;
return size;
}
-/* get data from the fifo (return -1 if not enough data) */
+/**
+ * Get data from the fifo (returns -1 if not enough data).
+ */
int fifo_read(FifoBuffer *f, uint8_t *buf, int buf_size, uint8_t **rptr_ptr)
{
- uint8_t *rptr = *rptr_ptr;
+ uint8_t *rptr;
int size, len;
+ if(!rptr_ptr)
+ rptr_ptr= &f->rptr;
+ rptr = *rptr_ptr;
+
if (f->wptr >= rptr) {
size = f->wptr - rptr;
} else {
return 0;
}
+/**
+ * Resizes a FIFO.
+ */
+void fifo_realloc(FifoBuffer *f, unsigned int new_size){
+ unsigned int old_size= f->end - f->buffer;
+
+ if(old_size < new_size){
+ uint8_t *old= f->buffer;
+
+ f->buffer= av_realloc(f->buffer, new_size);
+
+ f->rptr += f->buffer - old;
+ f->wptr += f->buffer - old;
+
+ if(f->wptr < f->rptr){
+ memmove(f->rptr + new_size - old_size, f->rptr, f->buffer + old_size - f->rptr);
+ f->rptr += new_size - old_size;
+ }
+ f->end= f->buffer + new_size;
+ }
+}
+
void fifo_write(FifoBuffer *f, uint8_t *buf, int size, uint8_t **wptr_ptr)
{
int len;
uint8_t *wptr;
+
+ if(!wptr_ptr)
+ wptr_ptr= &f->wptr;
wptr = *wptr_ptr;
+
while (size > 0) {
len = f->end - wptr;
if (len > size)
*wptr_ptr = wptr;
}
+/* get data from the fifo (return -1 if not enough data) */
+int put_fifo(ByteIOContext *pb, FifoBuffer *f, int buf_size, uint8_t **rptr_ptr)
+{
+ uint8_t *rptr = *rptr_ptr;
+ int size, len;
+
+ if (f->wptr >= rptr) {
+ size = f->wptr - rptr;
+ } else {
+ size = (f->end - rptr) + (f->wptr - f->buffer);
+ }
+
+ if (size < buf_size)
+ return -1;
+ while (buf_size > 0) {
+ len = f->end - rptr;
+ if (len > buf_size)
+ len = buf_size;
+ put_buffer(pb, rptr, len);
+ rptr += len;
+ if (rptr >= f->end)
+ rptr = f->buffer;
+ buf_size -= len;
+ }
+ *rptr_ptr = rptr;
+ return 0;
+}
+
int filename_number_test(const char *filename)
{
char buf[1024];
+ if(!filename)
+ return -1;
return get_frame_filename(buf, sizeof(buf), filename, 1);
}
-/* guess file format */
+/**
+ * Guess file format.
+ */
AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened)
{
AVInputFormat *fmt1, *fmt;
/************************************************************/
/* input media file */
+/**
+ * Open a media file from an IO stream. 'fmt' must be specified.
+ */
+static const char* format_to_name(void* ptr)
+{
+ AVFormatContext* fc = (AVFormatContext*) ptr;
+ if(fc->iformat) return fc->iformat->name;
+ else if(fc->oformat) return fc->oformat->name;
+ else return "NULL";
+}
+
+static const AVClass av_format_context_class = { "AVFormatContext", format_to_name };
+
+AVFormatContext *av_alloc_format_context(void)
+{
+ AVFormatContext *ic;
+ ic = av_mallocz(sizeof(AVFormatContext));
+ if (!ic) return ic;
+ ic->av_class = &av_format_context_class;
+ return ic;
+}
+
+/**
+ * Allocates all the structures needed to read an input stream.
+ * This does not open the needed codecs for decoding the stream[s].
+ */
+int av_open_input_stream(AVFormatContext **ic_ptr,
+ ByteIOContext *pb, const char *filename,
+ AVInputFormat *fmt, AVFormatParameters *ap)
+{
+ int err;
+ AVFormatContext *ic;
+
+ ic = av_alloc_format_context();
+ if (!ic) {
+ err = AVERROR_NOMEM;
+ goto fail;
+ }
+ ic->iformat = fmt;
+ if (pb)
+ ic->pb = *pb;
+ ic->duration = AV_NOPTS_VALUE;
+ ic->start_time = AV_NOPTS_VALUE;
+ pstrcpy(ic->filename, sizeof(ic->filename), filename);
+
+ /* allocate private data */
+ if (fmt->priv_data_size > 0) {
+ ic->priv_data = av_mallocz(fmt->priv_data_size);
+ if (!ic->priv_data) {
+ err = AVERROR_NOMEM;
+ goto fail;
+ }
+ } else {
+ ic->priv_data = NULL;
+ }
+
+ err = ic->iformat->read_header(ic, ap);
+ if (err < 0)
+ goto fail;
+
+ if (pb)
+ ic->data_offset = url_ftell(&ic->pb);
+
+ *ic_ptr = ic;
+ return 0;
+ fail:
+ if (ic) {
+ av_freep(&ic->priv_data);
+ }
+ av_free(ic);
+ *ic_ptr = NULL;
+ return err;
+}
+
+/** Size of probe buffer, for guessing file type from file contents. */
#define PROBE_BUF_SIZE 2048
/**
int buf_size,
AVFormatParameters *ap)
{
- AVFormatContext *ic = NULL;
- int err, must_open_file;
- unsigned char buf[PROBE_BUF_SIZE];
+ int err, must_open_file, file_opened;
+ uint8_t buf[PROBE_BUF_SIZE];
AVProbeData probe_data, *pd = &probe_data;
-
- ic = av_mallocz(sizeof(AVFormatContext));
- if (!ic) {
- err = AVERROR_NOMEM;
- goto fail;
- }
- ic->duration = AV_NOPTS_VALUE;
- ic->start_time = AV_NOPTS_VALUE;
- pstrcpy(ic->filename, sizeof(ic->filename), filename);
- pd->filename = ic->filename;
+ ByteIOContext pb1, *pb = &pb1;
+
+ file_opened = 0;
+ pd->filename = "";
+ if (filename)
+ pd->filename = filename;
pd->buf = buf;
pd->buf_size = 0;
/* do not open file if the format does not need it. XXX: specific
hack needed to handle RTSP/TCP */
must_open_file = 1;
- if ((fmt && (fmt->flags & AVFMT_NOFILE))
-#ifdef CONFIG_NETWORK
- || (fmt == &rtp_demux && !strcmp(filename, "null"))
-#endif
- ) {
+ if (fmt && (fmt->flags & AVFMT_NOFILE)) {
must_open_file = 0;
+ pb= NULL; //FIXME this or memset(pb, 0, sizeof(ByteIOContext)); otherwise its uninitalized
}
if (!fmt || must_open_file) {
/* if no file needed do not try to open one */
- if (url_fopen(&ic->pb, filename, URL_RDONLY) < 0) {
+ if (url_fopen(pb, filename, URL_RDONLY) < 0) {
err = AVERROR_IO;
goto fail;
}
+ file_opened = 1;
if (buf_size > 0) {
- url_setbufsize(&ic->pb, buf_size);
+ url_setbufsize(pb, buf_size);
}
if (!fmt) {
/* read probe data */
- pd->buf_size = get_buffer(&ic->pb, buf, PROBE_BUF_SIZE);
- url_fseek(&ic->pb, 0, SEEK_SET);
+ pd->buf_size = get_buffer(pb, buf, PROBE_BUF_SIZE);
+ if (url_fseek(pb, 0, SEEK_SET) == (offset_t)-EPIPE) {
+ url_fclose(pb);
+ if (url_fopen(pb, filename, URL_RDONLY) < 0) {
+ err = AVERROR_IO;
+ goto fail;
+ }
+ }
}
}
/* if still no format found, error */
if (!fmt) {
err = AVERROR_NOFMT;
- goto fail1;
+ goto fail;
}
/* XXX: suppress this hack for redirectors */
#ifdef CONFIG_NETWORK
if (fmt == &redir_demux) {
- err = redir_open(ic_ptr, &ic->pb);
- url_fclose(&ic->pb);
- av_free(ic);
+ err = redir_open(ic_ptr, pb);
+ url_fclose(pb);
return err;
}
#endif
- ic->iformat = fmt;
-
/* check filename in case of an image number is expected */
- if (ic->iformat->flags & AVFMT_NEEDNUMBER) {
- if (filename_number_test(ic->filename) < 0) {
+ if (fmt->flags & AVFMT_NEEDNUMBER) {
+ if (filename_number_test(filename) < 0) {
err = AVERROR_NUMEXPECTED;
- goto fail1;
+ goto fail;
}
}
-
- /* allocate private data */
- if (fmt->priv_data_size > 0) {
- ic->priv_data = av_mallocz(fmt->priv_data_size);
- if (!ic->priv_data) {
- err = AVERROR_NOMEM;
- goto fail1;
- }
- } else
- ic->priv_data = NULL;
-
- /* default pts settings is MPEG like */
- av_set_pts_info(ic, 33, 1, 90000);
-
- err = ic->iformat->read_header(ic, ap);
- if (err < 0)
- goto fail1;
- *ic_ptr = ic;
+ err = av_open_input_stream(ic_ptr, pb, filename, fmt, ap);
+ if (err)
+ goto fail;
return 0;
- fail1:
- if (!fmt || must_open_file) {
- url_fclose(&ic->pb);
- }
fail:
- if (ic) {
- av_freep(&ic->priv_data);
- }
- av_free(ic);
+ if (file_opened)
+ url_fclose(pb);
*ic_ptr = NULL;
return err;
+
}
+/*******************************************************/
+
/**
- * Read a packet from a media file
+ * Read a transport packet from a media file.
+ *
+ * This function is absolete and should never be used.
+ * Use av_read_frame() instead.
+ *
* @param s media file handle
* @param pkt is filled
- * @return 0 if OK. AVERROR_xxx if error.
+ * @return 0 if OK. AVERROR_xxx if error.
*/
int av_read_packet(AVFormatContext *s, AVPacket *pkt)
{
- AVPacketList *pktl;
-
- pktl = s->packet_buffer;
- if (pktl) {
- /* read packet from packet buffer, if there is data */
- *pkt = pktl->pkt;
- s->packet_buffer = pktl->next;
- av_free(pktl);
- return 0;
- } else {
- return s->iformat->read_packet(s, pkt);
- }
+ return s->iformat->read_packet(s, pkt);
}
+/**********************************************************/
-/* return TRUE if the stream has accurate timings for at least one component */
-static int av_has_timings(AVFormatContext *ic)
+/**
+ * Get the number of samples of an audio frame. Return (-1) if error.
+ */
+static int get_audio_frame_size(AVCodecContext *enc, int size)
{
- int i;
- AVStream *st;
-
- for(i = 0;i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->start_time != AV_NOPTS_VALUE &&
- st->duration != AV_NOPTS_VALUE)
- return 1;
+ int frame_size;
+
+ if (enc->frame_size <= 1) {
+ /* specific hack for pcm codecs because no frame size is
+ provided */
+ switch(enc->codec_id) {
+ case CODEC_ID_PCM_S16LE:
+ case CODEC_ID_PCM_S16BE:
+ case CODEC_ID_PCM_U16LE:
+ case CODEC_ID_PCM_U16BE:
+ if (enc->channels == 0)
+ return -1;
+ frame_size = size / (2 * enc->channels);
+ break;
+ case CODEC_ID_PCM_S8:
+ case CODEC_ID_PCM_U8:
+ case CODEC_ID_PCM_MULAW:
+ case CODEC_ID_PCM_ALAW:
+ if (enc->channels == 0)
+ return -1;
+ frame_size = size / (enc->channels);
+ break;
+ default:
+ /* used for example by ADPCM codecs */
+ if (enc->bit_rate == 0)
+ return -1;
+ frame_size = (size * 8 * enc->sample_rate) / enc->bit_rate;
+ break;
+ }
+ } else {
+ frame_size = enc->frame_size;
}
- return 0;
+ return frame_size;
}
-/* estimate the stream timings from the one of each components. Also
- compute the global bitrate if possible */
-static void av_update_stream_timings(AVFormatContext *ic)
+
+/**
+ * Return the frame duration in seconds, return 0 if not available.
+ */
+static void compute_frame_duration(int *pnum, int *pden, AVStream *st,
+ AVCodecParserContext *pc, AVPacket *pkt)
{
- int64_t start_time, end_time, end_time1;
- int i;
- AVStream *st;
+ int frame_size;
- start_time = MAXINT64;
- end_time = MININT64;
- for(i = 0;i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->start_time != AV_NOPTS_VALUE) {
- if (st->start_time < start_time)
- start_time = st->start_time;
- if (st->duration != AV_NOPTS_VALUE) {
- end_time1 = st->start_time + st->duration;
- if (end_time1 > end_time)
- end_time = end_time1;
+ *pnum = 0;
+ *pden = 0;
+ switch(st->codec->codec_type) {
+ case CODEC_TYPE_VIDEO:
+ if(st->time_base.num*1000LL > st->time_base.den){
+ *pnum = st->time_base.num;
+ *pden = st->time_base.den;
+ }else if(st->codec->time_base.num*1000LL > st->codec->time_base.den){
+ *pnum = st->codec->time_base.num;
+ *pden = st->codec->time_base.den;
+ if (pc && pc->repeat_pict) {
+ *pden *= 2;
+ *pnum = (*pnum) * (2 + pc->repeat_pict);
}
}
+ break;
+ case CODEC_TYPE_AUDIO:
+ frame_size = get_audio_frame_size(st->codec, pkt->size);
+ if (frame_size < 0)
+ break;
+ *pnum = frame_size;
+ *pden = st->codec->sample_rate;
+ break;
+ default:
+ break;
}
- if (start_time != MAXINT64) {
- ic->start_time = start_time;
- if (end_time != MAXINT64) {
- ic->duration = end_time - start_time;
- if (ic->file_size > 0) {
- /* compute the bit rate */
- ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
- (double)ic->duration;
- }
+}
+
+static int is_intra_only(AVCodecContext *enc){
+ if(enc->codec_type == CODEC_TYPE_AUDIO){
+ return 1;
+ }else if(enc->codec_type == CODEC_TYPE_VIDEO){
+ switch(enc->codec_id){
+ case CODEC_ID_MJPEG:
+ case CODEC_ID_MJPEGB:
+ case CODEC_ID_LJPEG:
+ case CODEC_ID_RAWVIDEO:
+ case CODEC_ID_DVVIDEO:
+ case CODEC_ID_HUFFYUV:
+ case CODEC_ID_FFVHUFF:
+ case CODEC_ID_ASV1:
+ case CODEC_ID_ASV2:
+ case CODEC_ID_VCR1:
+ return 1;
+ default: break;
}
}
+ return 0;
+}
+static int64_t lsb2full(int64_t lsb, int64_t last_ts, int lsb_bits){
+ int64_t mask = lsb_bits < 64 ? (1LL<<lsb_bits)-1 : -1LL;
+ int64_t delta= last_ts - mask/2;
+ return ((lsb - delta)&mask) + delta;
}
-static void fill_all_stream_timings(AVFormatContext *ic)
+static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
+ AVCodecParserContext *pc, AVPacket *pkt)
{
- int i;
- AVStream *st;
+ int num, den, presentation_delayed;
+ /* handle wrapping */
+ if(st->cur_dts != AV_NOPTS_VALUE){
+ if(pkt->pts != AV_NOPTS_VALUE)
+ pkt->pts= lsb2full(pkt->pts, st->cur_dts, st->pts_wrap_bits);
+ if(pkt->dts != AV_NOPTS_VALUE)
+ pkt->dts= lsb2full(pkt->dts, st->cur_dts, st->pts_wrap_bits);
+ }
+
+ if (pkt->duration == 0) {
+ compute_frame_duration(&num, &den, st, pc, pkt);
+ if (den && num) {
+ pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
+ }
+ }
+
+ if(is_intra_only(st->codec))
+ pkt->flags |= PKT_FLAG_KEY;
+
+ /* do we have a video B frame ? */
+ presentation_delayed = 0;
+ if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ /* XXX: need has_b_frame, but cannot get it if the codec is
+ not initialized */
+ if (( st->codec->codec_id == CODEC_ID_H264
+ || st->codec->has_b_frames) &&
+ pc && pc->pict_type != FF_B_TYPE)
+ presentation_delayed = 1;
+ /* this may be redundant, but it shouldnt hurt */
+ if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts > pkt->dts)
+ presentation_delayed = 1;
+ }
+
+ if(st->cur_dts == AV_NOPTS_VALUE){
+ if(presentation_delayed) st->cur_dts = -pkt->duration;
+ else st->cur_dts = 0;
+ }
+
+// av_log(NULL, AV_LOG_DEBUG, "IN delayed:%d pts:%lld, dts:%lld cur_dts:%lld st:%d pc:%p\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts, pkt->stream_index, pc);
+ /* interpolate PTS and DTS if they are not present */
+ if (presentation_delayed) {
+ /* DTS = decompression time stamp */
+ /* PTS = presentation time stamp */
+ if (pkt->dts == AV_NOPTS_VALUE) {
+ /* if we know the last pts, use it */
+ if(st->last_IP_pts != AV_NOPTS_VALUE)
+ st->cur_dts = pkt->dts = st->last_IP_pts;
+ else
+ pkt->dts = st->cur_dts;
+ } else {
+ st->cur_dts = pkt->dts;
+ }
+ /* this is tricky: the dts must be incremented by the duration
+ of the frame we are displaying, i.e. the last I or P frame */
+ if (st->last_IP_duration == 0)
+ st->cur_dts += pkt->duration;
+ else
+ st->cur_dts += st->last_IP_duration;
+ st->last_IP_duration = pkt->duration;
+ st->last_IP_pts= pkt->pts;
+ /* cannot compute PTS if not present (we can compute it only
+ by knowing the futur */
+ } else if(pkt->pts != AV_NOPTS_VALUE || pkt->dts != AV_NOPTS_VALUE || pkt->duration){
+ if(pkt->pts != AV_NOPTS_VALUE && pkt->duration){
+ int64_t old_diff= ABS(st->cur_dts - pkt->duration - pkt->pts);
+ int64_t new_diff= ABS(st->cur_dts - pkt->pts);
+ if(old_diff < new_diff && old_diff < (pkt->duration>>3)){
+ pkt->pts += pkt->duration;
+// av_log(NULL, AV_LOG_DEBUG, "id:%d old:%Ld new:%Ld dur:%d cur:%Ld size:%d\n", pkt->stream_index, old_diff, new_diff, pkt->duration, st->cur_dts, pkt->size);
+ }
+ }
+
+ /* presentation is not delayed : PTS and DTS are the same */
+ if (pkt->pts == AV_NOPTS_VALUE) {
+ if (pkt->dts == AV_NOPTS_VALUE) {
+ pkt->pts = st->cur_dts;
+ pkt->dts = st->cur_dts;
+ }
+ else {
+ st->cur_dts = pkt->dts;
+ pkt->pts = pkt->dts;
+ }
+ } else {
+ st->cur_dts = pkt->pts;
+ pkt->dts = pkt->pts;
+ }
+ st->cur_dts += pkt->duration;
+ }
+// av_log(NULL, AV_LOG_DEBUG, "OUTdelayed:%d pts:%lld, dts:%lld cur_dts:%lld\n", presentation_delayed, pkt->pts, pkt->dts, st->cur_dts);
+
+ /* update flags */
+ if (pc) {
+ pkt->flags = 0;
+ /* key frame computation */
+ switch(st->codec->codec_type) {
+ case CODEC_TYPE_VIDEO:
+ if (pc->pict_type == FF_I_TYPE)
+ pkt->flags |= PKT_FLAG_KEY;
+ break;
+ case CODEC_TYPE_AUDIO:
+ pkt->flags |= PKT_FLAG_KEY;
+ break;
+ default:
+ break;
+ }
+ }
+}
+
+void av_destruct_packet_nofree(AVPacket *pkt)
+{
+ pkt->data = NULL; pkt->size = 0;
+}
+
+static int av_read_frame_internal(AVFormatContext *s, AVPacket *pkt)
+{
+ AVStream *st;
+ int len, ret, i;
+
+ for(;;) {
+ /* select current input stream component */
+ st = s->cur_st;
+ if (st) {
+ if (!st->need_parsing || !st->parser) {
+ /* no parsing needed: we just output the packet as is */
+ /* raw data support */
+ *pkt = s->cur_pkt;
+ compute_pkt_fields(s, st, NULL, pkt);
+ s->cur_st = NULL;
+ return 0;
+ } else if (s->cur_len > 0 && st->discard < AVDISCARD_ALL) {
+ len = av_parser_parse(st->parser, st->codec, &pkt->data, &pkt->size,
+ s->cur_ptr, s->cur_len,
+ s->cur_pkt.pts, s->cur_pkt.dts);
+ s->cur_pkt.pts = AV_NOPTS_VALUE;
+ s->cur_pkt.dts = AV_NOPTS_VALUE;
+ /* increment read pointer */
+ s->cur_ptr += len;
+ s->cur_len -= len;
+
+ /* return packet if any */
+ if (pkt->size) {
+ got_packet:
+ pkt->duration = 0;
+ pkt->stream_index = st->index;
+ pkt->pts = st->parser->pts;
+ pkt->dts = st->parser->dts;
+ pkt->destruct = av_destruct_packet_nofree;
+ compute_pkt_fields(s, st, st->parser, pkt);
+ return 0;
+ }
+ } else {
+ /* free packet */
+ av_free_packet(&s->cur_pkt);
+ s->cur_st = NULL;
+ }
+ } else {
+ /* read next packet */
+ ret = av_read_packet(s, &s->cur_pkt);
+ if (ret < 0) {
+ if (ret == -EAGAIN)
+ return ret;
+ /* return the last frames, if any */
+ for(i = 0; i < s->nb_streams; i++) {
+ st = s->streams[i];
+ if (st->parser && st->need_parsing) {
+ av_parser_parse(st->parser, st->codec,
+ &pkt->data, &pkt->size,
+ NULL, 0,
+ AV_NOPTS_VALUE, AV_NOPTS_VALUE);
+ if (pkt->size)
+ goto got_packet;
+ }
+ }
+ /* no more packets: really terminates parsing */
+ return ret;
+ }
+
+ st = s->streams[s->cur_pkt.stream_index];
+
+ s->cur_st = st;
+ s->cur_ptr = s->cur_pkt.data;
+ s->cur_len = s->cur_pkt.size;
+ if (st->need_parsing && !st->parser) {
+ st->parser = av_parser_init(st->codec->codec_id);
+ if (!st->parser) {
+ /* no parser available : just output the raw packets */
+ st->need_parsing = 0;
+ }
+ }
+ }
+ }
+}
+
+/**
+ * Return the next frame of a stream.
+ *
+ * The returned packet is valid
+ * until the next av_read_frame() or until av_close_input_file() and
+ * must be freed with av_free_packet. For video, the packet contains
+ * exactly one frame. For audio, it contains an integer number of
+ * frames if each frame has a known fixed size (e.g. PCM or ADPCM
+ * data). If the audio frames have a variable size (e.g. MPEG audio),
+ * then it contains one frame.
+ *
+ * pkt->pts, pkt->dts and pkt->duration are always set to correct
+ * values in AV_TIME_BASE unit (and guessed if the format cannot
+ * provided them). pkt->pts can be AV_NOPTS_VALUE if the video format
+ * has B frames, so it is better to rely on pkt->dts if you do not
+ * decompress the payload.
+ *
+ * @return 0 if OK, < 0 if error or end of file.
+ */
+int av_read_frame(AVFormatContext *s, AVPacket *pkt)
+{
+ AVPacketList *pktl;
+
+ pktl = s->packet_buffer;
+ if (pktl) {
+ /* read packet from packet buffer, if there is data */
+ *pkt = pktl->pkt;
+ s->packet_buffer = pktl->next;
+ av_free(pktl);
+ return 0;
+ } else {
+ return av_read_frame_internal(s, pkt);
+ }
+}
+
+/* XXX: suppress the packet queue */
+static void flush_packet_queue(AVFormatContext *s)
+{
+ AVPacketList *pktl;
+
+ for(;;) {
+ pktl = s->packet_buffer;
+ if (!pktl)
+ break;
+ s->packet_buffer = pktl->next;
+ av_free_packet(&pktl->pkt);
+ av_free(pktl);
+ }
+}
+
+/*******************************************************/
+/* seek support */
+
+int av_find_default_stream_index(AVFormatContext *s)
+{
+ int i;
+ AVStream *st;
+
+ if (s->nb_streams <= 0)
+ return -1;
+ for(i = 0; i < s->nb_streams; i++) {
+ st = s->streams[i];
+ if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ return i;
+ }
+ }
+ return 0;
+}
+
+/**
+ * Flush the frame reader.
+ */
+static void av_read_frame_flush(AVFormatContext *s)
+{
+ AVStream *st;
+ int i;
+
+ flush_packet_queue(s);
+
+ /* free previous packet */
+ if (s->cur_st) {
+ if (s->cur_st->parser)
+ av_free_packet(&s->cur_pkt);
+ s->cur_st = NULL;
+ }
+ /* fail safe */
+ s->cur_ptr = NULL;
+ s->cur_len = 0;
+
+ /* for each stream, reset read state */
+ for(i = 0; i < s->nb_streams; i++) {
+ st = s->streams[i];
+
+ if (st->parser) {
+ av_parser_close(st->parser);
+ st->parser = NULL;
+ }
+ st->last_IP_pts = AV_NOPTS_VALUE;
+ st->cur_dts = 0; /* we set the current DTS to an unspecified origin */
+ }
+}
+
+/**
+ * Updates cur_dts of all streams based on given timestamp and AVStream.
+ *
+ * Stream ref_st unchanged, others set cur_dts in their native timebase
+ * only needed for timestamp wrapping or if (dts not set and pts!=dts)
+ * @param timestamp new dts expressed in time_base of param ref_st
+ * @param ref_st reference stream giving time_base of param timestamp
+ */
+static void av_update_cur_dts(AVFormatContext *s, AVStream *ref_st, int64_t timestamp){
+ int i;
+
+ for(i = 0; i < s->nb_streams; i++) {
+ AVStream *st = s->streams[i];
+
+ st->cur_dts = av_rescale(timestamp,
+ st->time_base.den * (int64_t)ref_st->time_base.num,
+ st->time_base.num * (int64_t)ref_st->time_base.den);
+ }
+}
+
+/**
+ * Add a index entry into a sorted list updateing if it is already there.
+ *
+ * @param timestamp timestamp in the timebase of the given stream
+ */
+int av_add_index_entry(AVStream *st,
+ int64_t pos, int64_t timestamp, int distance, int flags)
+{
+ AVIndexEntry *entries, *ie;
+ int index;
+
+ if((unsigned)st->nb_index_entries + 1 >= UINT_MAX / sizeof(AVIndexEntry))
+ return -1;
+
+ entries = av_fast_realloc(st->index_entries,
+ &st->index_entries_allocated_size,
+ (st->nb_index_entries + 1) *
+ sizeof(AVIndexEntry));
+ if(!entries)
+ return -1;
+
+ st->index_entries= entries;
+
+ index= av_index_search_timestamp(st, timestamp, AVSEEK_FLAG_ANY);
+
+ if(index<0){
+ index= st->nb_index_entries++;
+ ie= &entries[index];
+ assert(index==0 || ie[-1].timestamp < timestamp);
+ }else{
+ ie= &entries[index];
+ if(ie->timestamp != timestamp){
+ if(ie->timestamp <= timestamp)
+ return -1;
+ memmove(entries + index + 1, entries + index, sizeof(AVIndexEntry)*(st->nb_index_entries - index));
+ st->nb_index_entries++;
+ }else if(ie->pos == pos && distance < ie->min_distance) //dont reduce the distance
+ distance= ie->min_distance;
+ }
+
+ ie->pos = pos;
+ ie->timestamp = timestamp;
+ ie->min_distance= distance;
+ ie->flags = flags;
+
+ return index;
+}
+
+/**
+ * build an index for raw streams using a parser.
+ */
+static void av_build_index_raw(AVFormatContext *s)
+{
+ AVPacket pkt1, *pkt = &pkt1;
+ int ret;
+ AVStream *st;
+
+ st = s->streams[0];
+ av_read_frame_flush(s);
+ url_fseek(&s->pb, s->data_offset, SEEK_SET);
+
+ for(;;) {
+ ret = av_read_frame(s, pkt);
+ if (ret < 0)
+ break;
+ if (pkt->stream_index == 0 && st->parser &&
+ (pkt->flags & PKT_FLAG_KEY)) {
+ av_add_index_entry(st, st->parser->frame_offset, pkt->dts,
+ 0, AVINDEX_KEYFRAME);
+ }
+ av_free_packet(pkt);
+ }
+}
+
+/**
+ * Returns TRUE if we deal with a raw stream.
+ *
+ * Raw codec data and parsing needed.
+ */
+static int is_raw_stream(AVFormatContext *s)
+{
+ AVStream *st;
+
+ if (s->nb_streams != 1)
+ return 0;
+ st = s->streams[0];
+ if (!st->need_parsing)
+ return 0;
+ return 1;
+}
+
+/**
+ * Gets the index for a specific timestamp.
+ * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond to
+ * the timestamp which is <= the requested one, if backward is 0
+ * then it will be >=
+ * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
+ * @return < 0 if no such timestamp could be found
+ */
+int av_index_search_timestamp(AVStream *st, int64_t wanted_timestamp,
+ int flags)
+{
+ AVIndexEntry *entries= st->index_entries;
+ int nb_entries= st->nb_index_entries;
+ int a, b, m;
+ int64_t timestamp;
+
+ a = - 1;
+ b = nb_entries;
+
+ while (b - a > 1) {
+ m = (a + b) >> 1;
+ timestamp = entries[m].timestamp;
+ if(timestamp >= wanted_timestamp)
+ b = m;
+ if(timestamp <= wanted_timestamp)
+ a = m;
+ }
+ m= (flags & AVSEEK_FLAG_BACKWARD) ? a : b;
+
+ if(!(flags & AVSEEK_FLAG_ANY)){
+ while(m>=0 && m<nb_entries && !(entries[m].flags & AVINDEX_KEYFRAME)){
+ m += (flags & AVSEEK_FLAG_BACKWARD) ? -1 : 1;
+ }
+ }
+
+ if(m == nb_entries)
+ return -1;
+ return m;
+}
+
+#define DEBUG_SEEK
+
+/**
+ * Does a binary search using av_index_search_timestamp() and AVCodec.read_timestamp().
+ * this isnt supposed to be called directly by a user application, but by demuxers
+ * @param target_ts target timestamp in the time base of the given stream
+ * @param stream_index stream number
+ */
+int av_seek_frame_binary(AVFormatContext *s, int stream_index, int64_t target_ts, int flags){
+ AVInputFormat *avif= s->iformat;
+ int64_t pos_min, pos_max, pos, pos_limit;
+ int64_t ts_min, ts_max, ts;
+ int64_t start_pos, filesize;
+ int index, no_change;
+ AVStream *st;
+
+ if (stream_index < 0)
+ return -1;
+
+#ifdef DEBUG_SEEK
+ av_log(s, AV_LOG_DEBUG, "read_seek: %d %lld\n", stream_index, target_ts);
+#endif
+
+ ts_max=
+ ts_min= AV_NOPTS_VALUE;
+ pos_limit= -1; //gcc falsely says it may be uninitalized
+
+ st= s->streams[stream_index];
+ if(st->index_entries){
+ AVIndexEntry *e;
+
+ index= av_index_search_timestamp(st, target_ts, flags | AVSEEK_FLAG_BACKWARD); //FIXME whole func must be checked for non keyframe entries in index case, especially read_timestamp()
+ index= FFMAX(index, 0);
+ e= &st->index_entries[index];
+
+ if(e->timestamp <= target_ts || e->pos == e->min_distance){
+ pos_min= e->pos;
+ ts_min= e->timestamp;
+#ifdef DEBUG_SEEK
+ av_log(s, AV_LOG_DEBUG, "using cached pos_min=0x%llx dts_min=%lld\n",
+ pos_min,ts_min);
+#endif
+ }else{
+ assert(index==0);
+ }
+
+ index= av_index_search_timestamp(st, target_ts, flags & ~AVSEEK_FLAG_BACKWARD);
+ assert(index < st->nb_index_entries);
+ if(index >= 0){
+ e= &st->index_entries[index];
+ assert(e->timestamp >= target_ts);
+ pos_max= e->pos;
+ ts_max= e->timestamp;
+ pos_limit= pos_max - e->min_distance;
+#ifdef DEBUG_SEEK
+ av_log(s, AV_LOG_DEBUG, "using cached pos_max=0x%llx pos_limit=0x%llx dts_max=%lld\n",
+ pos_max,pos_limit, ts_max);
+#endif
+ }
+ }
+
+ if(ts_min == AV_NOPTS_VALUE){
+ pos_min = s->data_offset;
+ ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
+ if (ts_min == AV_NOPTS_VALUE)
+ return -1;
+ }
+
+ if(ts_max == AV_NOPTS_VALUE){
+ int step= 1024;
+ filesize = url_fsize(&s->pb);
+ pos_max = filesize - 1;
+ do{
+ pos_max -= step;
+ ts_max = avif->read_timestamp(s, stream_index, &pos_max, pos_max + step);
+ step += step;
+ }while(ts_max == AV_NOPTS_VALUE && pos_max >= step);
+ if (ts_max == AV_NOPTS_VALUE)
+ return -1;
+
+ for(;;){
+ int64_t tmp_pos= pos_max + 1;
+ int64_t tmp_ts= avif->read_timestamp(s, stream_index, &tmp_pos, INT64_MAX);
+ if(tmp_ts == AV_NOPTS_VALUE)
+ break;
+ ts_max= tmp_ts;
+ pos_max= tmp_pos;
+ if(tmp_pos >= filesize)
+ break;
+ }
+ pos_limit= pos_max;
+ }
+
+ no_change=0;
+ while (pos_min < pos_limit) {
+#ifdef DEBUG_SEEK
+ av_log(s, AV_LOG_DEBUG, "pos_min=0x%llx pos_max=0x%llx dts_min=%lld dts_max=%lld\n",
+ pos_min, pos_max,
+ ts_min, ts_max);
+#endif
+ assert(pos_limit <= pos_max);
+
+ if(no_change==0){
+ int64_t approximate_keyframe_distance= pos_max - pos_limit;
+ // interpolate position (better than dichotomy)
+ pos = av_rescale(target_ts - ts_min, pos_max - pos_min, ts_max - ts_min)
+ + pos_min - approximate_keyframe_distance;
+ }else if(no_change==1){
+ // bisection, if interpolation failed to change min or max pos last time
+ pos = (pos_min + pos_limit)>>1;
+ }else{
+ // linear search if bisection failed, can only happen if there are very few or no keframes between min/max
+ pos=pos_min;
+ }
+ if(pos <= pos_min)
+ pos= pos_min + 1;
+ else if(pos > pos_limit)
+ pos= pos_limit;
+ start_pos= pos;
+
+ ts = avif->read_timestamp(s, stream_index, &pos, INT64_MAX); //may pass pos_limit instead of -1
+ if(pos == pos_max)
+ no_change++;
+ else
+ no_change=0;
+#ifdef DEBUG_SEEK
+av_log(s, AV_LOG_DEBUG, "%Ld %Ld %Ld / %Ld %Ld %Ld target:%Ld limit:%Ld start:%Ld noc:%d\n", pos_min, pos, pos_max, ts_min, ts, ts_max, target_ts, pos_limit, start_pos, no_change);
+#endif
+ assert(ts != AV_NOPTS_VALUE);
+ if (target_ts <= ts) {
+ pos_limit = start_pos - 1;
+ pos_max = pos;
+ ts_max = ts;
+ }
+ if (target_ts >= ts) {
+ pos_min = pos;
+ ts_min = ts;
+ }
+ }
+
+ pos = (flags & AVSEEK_FLAG_BACKWARD) ? pos_min : pos_max;
+ ts = (flags & AVSEEK_FLAG_BACKWARD) ? ts_min : ts_max;
+#ifdef DEBUG_SEEK
+ pos_min = pos;
+ ts_min = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
+ pos_min++;
+ ts_max = avif->read_timestamp(s, stream_index, &pos_min, INT64_MAX);
+ av_log(s, AV_LOG_DEBUG, "pos=0x%llx %lld<=%lld<=%lld\n",
+ pos, ts_min, target_ts, ts_max);
+#endif
+ /* do the seek */
+ url_fseek(&s->pb, pos, SEEK_SET);
+
+ av_update_cur_dts(s, st, ts);
+
+ return 0;
+}
+
+static int av_seek_frame_byte(AVFormatContext *s, int stream_index, int64_t pos, int flags){
+ int64_t pos_min, pos_max;
+#if 0
+ AVStream *st;
+
+ if (stream_index < 0)
+ return -1;
+
+ st= s->streams[stream_index];
+#endif
+
+ pos_min = s->data_offset;
+ pos_max = url_fsize(&s->pb) - 1;
+
+ if (pos < pos_min) pos= pos_min;
+ else if(pos > pos_max) pos= pos_max;
+
+ url_fseek(&s->pb, pos, SEEK_SET);
+
+#if 0
+ av_update_cur_dts(s, st, ts);
+#endif
+ return 0;
+}
+
+static int av_seek_frame_generic(AVFormatContext *s,
+ int stream_index, int64_t timestamp, int flags)
+{
+ int index;
+ AVStream *st;
+ AVIndexEntry *ie;
+
+ if (!s->index_built) {
+ if (is_raw_stream(s)) {
+ av_build_index_raw(s);
+ } else {
+ return -1;
+ }
+ s->index_built = 1;
+ }
+
+ st = s->streams[stream_index];
+ index = av_index_search_timestamp(st, timestamp, flags);
+ if (index < 0)
+ return -1;
+
+ /* now we have found the index, we can seek */
+ ie = &st->index_entries[index];
+ av_read_frame_flush(s);
+ url_fseek(&s->pb, ie->pos, SEEK_SET);
+
+ av_update_cur_dts(s, st, ie->timestamp);
+
+ return 0;
+}
+
+/**
+ * Seek to the key frame at timestamp.
+ * 'timestamp' in 'stream_index'.
+ * @param stream_index If stream_index is (-1), a default
+ * stream is selected, and timestamp is automatically converted
+ * from AV_TIME_BASE units to the stream specific time_base.
+ * @param timestamp timestamp in AVStream.time_base units
+ * or if there is no stream specified then in AV_TIME_BASE units
+ * @param flags flags which select direction and seeking mode
+ * @return >= 0 on success
+ */
+int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ int ret;
+ AVStream *st;
+
+ av_read_frame_flush(s);
+
+ if(flags & AVSEEK_FLAG_BYTE)
+ return av_seek_frame_byte(s, stream_index, timestamp, flags);
+
+ if(stream_index < 0){
+ stream_index= av_find_default_stream_index(s);
+ if(stream_index < 0)
+ return -1;
+
+ st= s->streams[stream_index];
+ /* timestamp for default must be expressed in AV_TIME_BASE units */
+ timestamp = av_rescale(timestamp, st->time_base.den, AV_TIME_BASE * (int64_t)st->time_base.num);
+ }
+ st= s->streams[stream_index];
+
+ /* first, we try the format specific seek */
+ if (s->iformat->read_seek)
+ ret = s->iformat->read_seek(s, stream_index, timestamp, flags);
+ else
+ ret = -1;
+ if (ret >= 0) {
+ return 0;
+ }
+
+ if(s->iformat->read_timestamp)
+ return av_seek_frame_binary(s, stream_index, timestamp, flags);
+ else
+ return av_seek_frame_generic(s, stream_index, timestamp, flags);
+}
+
+/*******************************************************/
+
+/**
+ * Returns TRUE if the stream has accurate timings in any stream.
+ *
+ * @return TRUE if the stream has accurate timings for at least one component.
+ */
+static int av_has_timings(AVFormatContext *ic)
+{
+ int i;
+ AVStream *st;
- av_update_stream_timings(ic);
+ for(i = 0;i < ic->nb_streams; i++) {
+ st = ic->streams[i];
+ if (st->start_time != AV_NOPTS_VALUE &&
+ st->duration != AV_NOPTS_VALUE)
+ return 1;
+ }
+ return 0;
+}
+
+/**
+ * Estimate the stream timings from the one of each components.
+ *
+ * Also computes the global bitrate if possible.
+ */
+static void av_update_stream_timings(AVFormatContext *ic)
+{
+ int64_t start_time, start_time1, end_time, end_time1;
+ int i;
+ AVStream *st;
+
+ start_time = MAXINT64;
+ end_time = MININT64;
+ for(i = 0;i < ic->nb_streams; i++) {
+ st = ic->streams[i];
+ if (st->start_time != AV_NOPTS_VALUE) {
+ start_time1= av_rescale_q(st->start_time, st->time_base, AV_TIME_BASE_Q);
+ if (start_time1 < start_time)
+ start_time = start_time1;
+ if (st->duration != AV_NOPTS_VALUE) {
+ end_time1 = start_time1
+ + av_rescale_q(st->duration, st->time_base, AV_TIME_BASE_Q);
+ if (end_time1 > end_time)
+ end_time = end_time1;
+ }
+ }
+ }
+ if (start_time != MAXINT64) {
+ ic->start_time = start_time;
+ if (end_time != MININT64) {
+ ic->duration = end_time - start_time;
+ if (ic->file_size > 0) {
+ /* compute the bit rate */
+ ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
+ (double)ic->duration;
+ }
+ }
+ }
+
+}
+
+static void fill_all_stream_timings(AVFormatContext *ic)
+{
+ int i;
+ AVStream *st;
+
+ av_update_stream_timings(ic);
for(i = 0;i < ic->nb_streams; i++) {
st = ic->streams[i];
if (st->start_time == AV_NOPTS_VALUE) {
- st->start_time = ic->start_time;
- st->duration = ic->duration;
+ if(ic->start_time != AV_NOPTS_VALUE)
+ st->start_time = av_rescale_q(ic->start_time, AV_TIME_BASE_Q, st->time_base);
+ if(ic->duration != AV_NOPTS_VALUE)
+ st->duration = av_rescale_q(ic->duration, AV_TIME_BASE_Q, st->time_base);
}
}
}
bit_rate = 0;
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
- bit_rate += st->codec.bit_rate;
+ bit_rate += st->codec->bit_rate;
}
ic->bit_rate = bit_rate;
}
ic->file_size != 0) {
filesize = ic->file_size;
if (filesize > 0) {
- duration = (int64_t)((8 * AV_TIME_BASE * (double)filesize) / (double)ic->bit_rate);
for(i = 0; i < ic->nb_streams; i++) {
st = ic->streams[i];
+ duration= av_rescale(8*filesize, st->time_base.den, ic->bit_rate*(int64_t)st->time_base.num);
if (st->start_time == AV_NOPTS_VALUE ||
st->duration == AV_NOPTS_VALUE) {
st->start_time = 0;
}
}
-static void flush_packet_queue(AVFormatContext *s)
-{
- AVPacketList *pktl;
-
- for(;;) {
- pktl = s->packet_buffer;
- if (!pktl)
- break;
- s->packet_buffer = pktl->next;
- av_free_packet(&pktl->pkt);
- av_free(pktl);
- }
-}
-
#define DURATION_MAX_READ_SIZE 250000
/* only usable for MPEG-PS streams */
AVPacket pkt1, *pkt = &pkt1;
AVStream *st;
int read_size, i, ret;
- int64_t start_time, end_time, end_time1;
+ int64_t end_time;
int64_t filesize, offset, duration;
+ /* free previous packet */
+ if (ic->cur_st && ic->cur_st->parser)
+ av_free_packet(&ic->cur_pkt);
+ ic->cur_st = NULL;
+
+ /* flush packet queue */
+ flush_packet_queue(ic);
+
+ for(i=0;i<ic->nb_streams;i++) {
+ st = ic->streams[i];
+ if (st->parser) {
+ av_parser_close(st->parser);
+ st->parser= NULL;
+ }
+ }
+
/* we read the first packets to get the first PTS (not fully
accurate, but it is enough now) */
url_fseek(&ic->pb, 0, SEEK_SET);
st = ic->streams[pkt->stream_index];
if (pkt->pts != AV_NOPTS_VALUE) {
if (st->start_time == AV_NOPTS_VALUE)
- st->start_time = (int64_t)((double)pkt->pts * ic->pts_num * (double)AV_TIME_BASE / ic->pts_den);
+ st->start_time = pkt->pts;
}
av_free_packet(pkt);
}
- /* we compute the minimum start_time and use it as default */
- start_time = MAXINT64;
- for(i = 0; i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->start_time != AV_NOPTS_VALUE &&
- st->start_time < start_time)
- start_time = st->start_time;
- }
- if (start_time != MAXINT64)
- ic->start_time = start_time;
-
/* estimate the end time (duration) */
/* XXX: may need to support wrapping */
filesize = ic->file_size;
if (offset < 0)
offset = 0;
- /* flush packet queue */
- flush_packet_queue(ic);
-
url_fseek(&ic->pb, offset, SEEK_SET);
read_size = 0;
for(;;) {
read_size += pkt->size;
st = ic->streams[pkt->stream_index];
if (pkt->pts != AV_NOPTS_VALUE) {
- end_time = (int64_t)((double)pkt->pts * ic->pts_num * (double)AV_TIME_BASE / ic->pts_den);
+ end_time = pkt->pts;
duration = end_time - st->start_time;
if (duration > 0) {
if (st->duration == AV_NOPTS_VALUE ||
av_free_packet(pkt);
}
- /* estimate total duration */
- end_time = MININT64;
- for(i = 0;i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->duration != AV_NOPTS_VALUE) {
- end_time1 = st->start_time + st->duration;
- if (end_time1 > end_time)
- end_time = end_time1;
- }
- }
-
- /* update start_time (new stream may have been created, so we do
- it at the end */
- if (ic->start_time != AV_NOPTS_VALUE) {
- for(i = 0; i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->start_time == AV_NOPTS_VALUE)
- st->start_time = ic->start_time;
- }
- }
-
- if (end_time != MININT64) {
- /* put dummy values for duration if needed */
- for(i = 0;i < ic->nb_streams; i++) {
- st = ic->streams[i];
- if (st->duration == AV_NOPTS_VALUE &&
- st->start_time != AV_NOPTS_VALUE)
- st->duration = end_time - st->start_time;
- }
- ic->duration = end_time - ic->start_time;
- }
+ fill_all_stream_timings(ic);
url_fseek(&ic->pb, 0, SEEK_SET);
}
static void av_estimate_timings(AVFormatContext *ic)
{
- URLContext *h;
int64_t file_size;
/* get the file size, if possible */
if (ic->iformat->flags & AVFMT_NOFILE) {
file_size = 0;
} else {
- h = url_fileno(&ic->pb);
- file_size = url_filesize(h);
+ file_size = url_fsize(&ic->pb);
if (file_size < 0)
file_size = 0;
}
ic->file_size = file_size;
- if (ic->iformat == &mpegps_demux) {
+ if ((ic->iformat == &mpegps_demux || ic->iformat == &mpegts_demux) && file_size && !ic->pb.is_streamed) {
/* get accurate estimate from the PTSes */
av_estimate_timings_from_pts(ic);
} else if (av_has_timings(ic)) {
#endif
}
-/* state for codec information */
-#define CSTATE_NOTFOUND 0
-#define CSTATE_DECODING 1
-#define CSTATE_FOUND 2
-
static int has_codec_parameters(AVCodecContext *enc)
{
int val;
val = enc->sample_rate;
break;
case CODEC_TYPE_VIDEO:
- val = enc->width;
+ val = enc->width && enc->pix_fmt != PIX_FMT_NONE;
+ break;
+ default:
+ val = 1;
+ break;
+ }
+ return (val != 0);
+}
+
+static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
+{
+ int16_t *samples;
+ AVCodec *codec;
+ int got_picture, ret=0;
+ AVFrame picture;
+
+ if(!st->codec->codec){
+ codec = avcodec_find_decoder(st->codec->codec_id);
+ if (!codec)
+ return -1;
+ ret = avcodec_open(st->codec, codec);
+ if (ret < 0)
+ return ret;
+ }
+
+ if(!has_codec_parameters(st->codec)){
+ switch(st->codec->codec_type) {
+ case CODEC_TYPE_VIDEO:
+ ret = avcodec_decode_video(st->codec, &picture,
+ &got_picture, (uint8_t *)data, size);
+ break;
+ case CODEC_TYPE_AUDIO:
+ samples = av_malloc(AVCODEC_MAX_AUDIO_FRAME_SIZE);
+ if (!samples)
+ goto fail;
+ ret = avcodec_decode_audio(st->codec, samples,
+ &got_picture, (uint8_t *)data, size);
+ av_free(samples);
break;
default:
- val = 1;
break;
}
- return (val != 0);
+ }
+ fail:
+ return ret;
}
+/* absolute maximum size we read until we abort */
+#define MAX_READ_SIZE 5000000
+
+/* maximum duration until we stop analysing the stream */
+#define MAX_STREAM_DURATION ((int)(AV_TIME_BASE * 2.0))
+
/**
* Read the beginning of a media file to get stream information. This
* is useful for file formats with no headers such as MPEG. This
*
* @param ic media file handle
* @return >=0 if OK. AVERROR_xxx if error.
+ * @todo let user decide somehow what information is needed so we dont waste time geting stuff the user doesnt need
*/
int av_find_stream_info(AVFormatContext *ic)
{
- int i, count, ret, got_picture, size, read_size;
- AVCodec *codec;
+ int i, count, ret, read_size;
AVStream *st;
- AVPacket *pkt;
- AVFrame picture;
+ AVPacket pkt1, *pkt;
AVPacketList *pktl=NULL, **ppktl;
- short samples[AVCODEC_MAX_AUDIO_FRAME_SIZE / 2];
- uint8_t *ptr;
- int min_read_size, max_read_size;
-
- /* typical mpeg ts rate is 40 Mbits. DVD rate is about 10
- Mbits. We read at most 0.2 second of file to find all streams */
-
- /* XXX: base it on stream bitrate when possible */
- if (ic->iformat == &mpegts_demux) {
- /* maximum number of bytes we accept to read to find all the streams
- in a file */
- min_read_size = 6000000;
- } else {
- min_read_size = 250000;
- }
- /* max read size is 2 seconds of video max */
- max_read_size = min_read_size * 10;
+ int64_t last_dts[MAX_STREAMS];
+ int64_t duration_sum[MAX_STREAMS];
+ int duration_count[MAX_STREAMS]={0};
- /* set initial codec state */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
- if (has_codec_parameters(&st->codec))
- st->codec_info_state = CSTATE_FOUND;
- else
- st->codec_info_state = CSTATE_NOTFOUND;
- st->codec_info_nb_repeat_frames = 0;
- st->codec_info_nb_real_frames = 0;
+ if(st->codec->codec_type == CODEC_TYPE_VIDEO){
+/* if(!st->time_base.num)
+ st->time_base= */
+ if(!st->codec->time_base.num)
+ st->codec->time_base= st->time_base;
+ }
+ //only for the split stuff
+ if (!st->parser) {
+ st->parser = av_parser_init(st->codec->codec_id);
+ }
}
+ for(i=0;i<MAX_STREAMS;i++){
+ last_dts[i]= AV_NOPTS_VALUE;
+ duration_sum[i]= INT64_MAX;
+ }
+
count = 0;
read_size = 0;
ppktl = &ic->packet_buffer;
/* check if one codec still needs to be handled */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
- if (st->codec_info_state != CSTATE_FOUND)
+ if (!has_codec_parameters(st->codec))
+ break;
+ /* variable fps and no guess at the real fps */
+ if( st->codec->time_base.den >= 1000LL*st->codec->time_base.num
+ && duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
+ break;
+ if(st->parser && st->parser->parser->split && !st->codec->extradata)
break;
}
if (i == ic->nb_streams) {
/* NOTE: if the format has no header, then we need to read
some packets to get most of the streams, so we cannot
stop here */
- if (!(ic->iformat->flags & AVFMT_NOHEADER) ||
- read_size >= min_read_size) {
+ if (!(ic->ctx_flags & AVFMTCTX_NOHEADER)) {
/* if we found the info for all the codecs, we can stop */
ret = count;
break;
}
} else {
/* we did not get all the codec info, but we read too much data */
- if (read_size >= max_read_size) {
+ if (read_size >= MAX_READ_SIZE) {
ret = count;
break;
}
}
+ /* NOTE: a new stream can be added there if no header in file
+ (AVFMTCTX_NOHEADER) */
+ ret = av_read_frame_internal(ic, &pkt1);
+ if (ret < 0) {
+ /* EOF or error */
+ ret = -1; /* we could not have all the codec parameters before EOF */
+ for(i=0;i<ic->nb_streams;i++) {
+ st = ic->streams[i];
+ if (!has_codec_parameters(st->codec))
+ break;
+ }
+ if (i == ic->nb_streams)
+ ret = 0;
+ break;
+ }
+
pktl = av_mallocz(sizeof(AVPacketList));
if (!pktl) {
ret = AVERROR_NOMEM;
*ppktl = pktl;
ppktl = &pktl->next;
- /* NOTE: a new stream can be added there if no header in file
- (AVFMT_NOHEADER) */
pkt = &pktl->pkt;
- if (ic->iformat->read_packet(ic, pkt) < 0) {
- /* EOF or error */
- ret = -1; /* we could not have all the codec parameters before EOF */
- if ((ic->iformat->flags & AVFMT_NOHEADER) &&
- i == ic->nb_streams)
- ret = 0;
- break;
+ *pkt = pkt1;
+
+ /* duplicate the packet */
+ if (av_dup_packet(pkt) < 0) {
+ ret = AVERROR_NOMEM;
+ break;
}
+
read_size += pkt->size;
- /* open new codecs */
- for(i=0;i<ic->nb_streams;i++) {
- st = ic->streams[i];
- if (st->codec_info_state == CSTATE_NOTFOUND) {
- /* set to found in case of error */
- st->codec_info_state = CSTATE_FOUND;
- codec = avcodec_find_decoder(st->codec.codec_id);
- if (codec) {
- if(codec->capabilities & CODEC_CAP_TRUNCATED)
- st->codec.flags |= CODEC_FLAG_TRUNCATED;
-
- ret = avcodec_open(&st->codec, codec);
- if (ret >= 0)
- st->codec_info_state = CSTATE_DECODING;
+ st = ic->streams[pkt->stream_index];
+ st->codec_info_duration += pkt->duration;
+ if (pkt->duration != 0)
+ st->codec_info_nb_frames++;
+
+ {
+ int index= pkt->stream_index;
+ int64_t last= last_dts[index];
+ int64_t duration= pkt->dts - last;
+
+ if(pkt->dts != AV_NOPTS_VALUE && last != AV_NOPTS_VALUE && duration>0){
+ if(duration*duration_count[index]*10/9 < duration_sum[index]){
+ duration_sum[index]= duration;
+ duration_count[index]=1;
+ }else{
+ int factor= av_rescale(duration, duration_count[index], duration_sum[index]);
+ duration_sum[index] += duration;
+ duration_count[index]+= factor;
}
+ if(st->codec_info_nb_frames == 0 && 0)
+ st->codec_info_duration += duration;
+ }
+ last_dts[pkt->stream_index]= pkt->dts;
+ }
+ if(st->parser && st->parser->parser->split && !st->codec->extradata){
+ int i= st->parser->parser->split(st->codec, pkt->data, pkt->size);
+ if(i){
+ st->codec->extradata_size= i;
+ st->codec->extradata= av_malloc(st->codec->extradata_size);
+ memcpy(st->codec->extradata, pkt->data, st->codec->extradata_size);
}
}
+
+ /* if still no information, we try to open the codec and to
+ decompress the frame. We try to avoid that in most cases as
+ it takes longer and uses more memory. For MPEG4, we need to
+ decompress for Quicktime. */
+ if (!has_codec_parameters(st->codec) /*&&
+ (st->codec->codec_id == CODEC_ID_FLV1 ||
+ st->codec->codec_id == CODEC_ID_H264 ||
+ st->codec->codec_id == CODEC_ID_H263 ||
+ st->codec->codec_id == CODEC_ID_H261 ||
+ st->codec->codec_id == CODEC_ID_VORBIS ||
+ st->codec->codec_id == CODEC_ID_MJPEG ||
+ st->codec->codec_id == CODEC_ID_PNG ||
+ st->codec->codec_id == CODEC_ID_PAM ||
+ st->codec->codec_id == CODEC_ID_PGM ||
+ st->codec->codec_id == CODEC_ID_PGMYUV ||
+ st->codec->codec_id == CODEC_ID_PBM ||
+ st->codec->codec_id == CODEC_ID_PPM ||
+ st->codec->codec_id == CODEC_ID_SHORTEN ||
+ (st->codec->codec_id == CODEC_ID_MPEG4 && !st->need_parsing))*/)
+ try_decode_frame(st, pkt->data, pkt->size);
+
+ if (av_rescale_q(st->codec_info_duration, st->time_base, AV_TIME_BASE_Q) >= MAX_STREAM_DURATION) {
+ break;
+ }
+ count++;
+ }
- st = ic->streams[pkt->stream_index];
- if (st->codec_info_state == CSTATE_DECODING) {
- /* decode the data and update codec parameters */
- ptr = pkt->data;
- size = pkt->size;
- while (size > 0) {
- switch(st->codec.codec_type) {
- case CODEC_TYPE_VIDEO:
- ret = avcodec_decode_video(&st->codec, &picture,
- &got_picture, ptr, size);
- break;
- case CODEC_TYPE_AUDIO:
- ret = avcodec_decode_audio(&st->codec, samples,
- &got_picture, ptr, size);
- break;
- default:
- ret = -1;
- break;
- }
- if (ret < 0) {
- /* if error, simply ignore because another packet
- may be OK */
- break;
+ // close codecs which where opened in try_decode_frame()
+ for(i=0;i<ic->nb_streams;i++) {
+ st = ic->streams[i];
+ if(st->codec->codec)
+ avcodec_close(st->codec);
+ }
+ for(i=0;i<ic->nb_streams;i++) {
+ st = ic->streams[i];
+ if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ if(st->codec->codec_id == CODEC_ID_RAWVIDEO && !st->codec->codec_tag && !st->codec->bits_per_sample)
+ st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
+
+ if(duration_count[i] && st->codec->time_base.num*1000LL <= st->codec->time_base.den &&
+ st->time_base.num*duration_sum[i]/duration_count[i]*1000LL > st->time_base.den){
+ AVRational fps1;
+ int64_t num, den;
+
+ num= st->time_base.den*duration_count[i];
+ den= st->time_base.num*duration_sum[i];
+
+ av_reduce(&fps1.num, &fps1.den, num*1001, den*1000, FFMAX(st->time_base.den, st->time_base.num)/4);
+ av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den, num, den, FFMAX(st->time_base.den, st->time_base.num)/4);
+ if(fps1.num < st->r_frame_rate.num && fps1.den == 1 && (fps1.num==24 || fps1.num==30)){ //FIXME better decission
+ st->r_frame_rate.num= fps1.num*1000;
+ st->r_frame_rate.den= fps1.den*1001;
}
- if (got_picture) {
- /* we got the parameters - now we can stop
- examining this stream */
- /* XXX: add a codec info so that we can decide if
- the codec can repeat frames */
- if (st->codec.codec_id == CODEC_ID_MPEG1VIDEO &&
- ic->iformat != &mpegts_demux &&
- st->codec.sub_id == 2) {
- /* for mpeg2 video, we want to know the real
- frame rate, so we decode 40 frames. In mpeg
- TS case we do not do it because it would be
- too long */
- st->codec_info_nb_real_frames++;
- st->codec_info_nb_repeat_frames += st->codec.coded_frame->repeat_pict;
+ }
+
+ /* set real frame rate info */
+ /* compute the real frame rate for telecine */
+ if ((st->codec->codec_id == CODEC_ID_MPEG1VIDEO ||
+ st->codec->codec_id == CODEC_ID_MPEG2VIDEO) &&
+ st->codec->sub_id == 2) {
+ if (st->codec_info_nb_frames >= 20) {
+ float coded_frame_rate, est_frame_rate;
+ est_frame_rate = ((double)st->codec_info_nb_frames * AV_TIME_BASE) /
+ (double)st->codec_info_duration ;
+ coded_frame_rate = 1.0/av_q2d(st->codec->time_base);
#if 0
- /* XXX: testing */
- if ((st->codec_info_nb_real_frames % 24) == 23) {
- st->codec_info_nb_repeat_frames += 2;
- }
+ printf("telecine: coded_frame_rate=%0.3f est_frame_rate=%0.3f\n",
+ coded_frame_rate, est_frame_rate);
#endif
- /* stop after 40 frames */
- if (st->codec_info_nb_real_frames >= 40) {
- av_reduce(
- &st->r_frame_rate,
- &st->r_frame_rate_base,
- (int64_t)st->codec.frame_rate * st->codec_info_nb_real_frames,
- (st->codec_info_nb_real_frames + (st->codec_info_nb_repeat_frames >> 1)) * st->codec.frame_rate_base,
- 1<<30);
- goto close_codec;
- }
- } else {
- close_codec:
- st->codec_info_state = CSTATE_FOUND;
- avcodec_close(&st->codec);
- break;
+ /* if we detect that it could be a telecine, we
+ signal it. It would be better to do it at a
+ higher level as it can change in a film */
+ if (coded_frame_rate >= 24.97 &&
+ (est_frame_rate >= 23.5 && est_frame_rate < 24.5)) {
+ st->r_frame_rate = (AVRational){24000, 1001};
}
}
- ptr += ret;
- size -= ret;
+ }
+ /* if no real frame rate, use the codec one */
+ if (!st->r_frame_rate.num){
+ st->r_frame_rate.num = st->codec->time_base.den;
+ st->r_frame_rate.den = st->codec->time_base.num;
}
}
- count++;
- }
-
- /* close each codec if there are opened */
- for(i=0;i<ic->nb_streams;i++) {
- st = ic->streams[i];
- if (st->codec_info_state == CSTATE_DECODING)
- avcodec_close(&st->codec);
}
- /* set real frame rate info */
+ av_estimate_timings(ic);
+#if 0
+ /* correct DTS for b frame streams with no timestamps */
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
- if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
- if (!st->r_frame_rate){
- st->r_frame_rate = st->codec.frame_rate;
- st->r_frame_rate_base = st->codec.frame_rate_base;
+ if (st->codec->codec_type == CODEC_TYPE_VIDEO) {
+ if(b-frames){
+ ppktl = &ic->packet_buffer;
+ while(ppkt1){
+ if(ppkt1->stream_index != i)
+ continue;
+ if(ppkt1->pkt->dts < 0)
+ break;
+ if(ppkt1->pkt->pts != AV_NOPTS_VALUE)
+ break;
+ ppkt1->pkt->dts -= delta;
+ ppkt1= ppkt1->next;
+ }
+ if(ppkt1)
+ continue;
+ st->cur_dts -= delta;
}
}
}
+#endif
+ return ret;
+}
+/*******************************************************/
- av_estimate_timings(ic);
- return ret;
+/**
+ * start playing a network based stream (e.g. RTSP stream) at the
+ * current position
+ */
+int av_read_play(AVFormatContext *s)
+{
+ if (!s->iformat->read_play)
+ return AVERROR_NOTSUPP;
+ return s->iformat->read_play(s);
+}
+
+/**
+ * Pause a network based stream (e.g. RTSP stream).
+ *
+ * Use av_read_play() to resume it.
+ */
+int av_read_pause(AVFormatContext *s)
+{
+ if (!s->iformat->read_pause)
+ return AVERROR_NOTSUPP;
+ return s->iformat->read_pause(s);
}
/**
- * Close a media file (but not its codecs)
+ * Close a media file (but not its codecs).
*
* @param s media file handle
*/
void av_close_input_file(AVFormatContext *s)
{
int i, must_open_file;
+ AVStream *st;
+
+ /* free previous packet */
+ if (s->cur_st && s->cur_st->parser)
+ av_free_packet(&s->cur_pkt);
if (s->iformat->read_close)
s->iformat->read_close(s);
for(i=0;i<s->nb_streams;i++) {
- av_free(s->streams[i]);
- }
- if (s->packet_buffer) {
- AVPacketList *p, *p1;
- p = s->packet_buffer;
- while (p != NULL) {
- p1 = p->next;
- av_free_packet(&p->pkt);
- av_free(p);
- p = p1;
+ /* free all data in a stream component */
+ st = s->streams[i];
+ if (st->parser) {
+ av_parser_close(st->parser);
}
- s->packet_buffer = NULL;
+ av_free(st->index_entries);
+ av_free(st->codec);
+ av_free(st);
}
+ flush_packet_queue(s);
must_open_file = 1;
- if ((s->iformat->flags & AVFMT_NOFILE)
-#ifdef CONFIG_NETWORK
- || (s->iformat == &rtp_demux && !strcmp(s->filename, "null"))
-#endif
- ) {
+ if (s->iformat->flags & AVFMT_NOFILE) {
must_open_file = 0;
}
if (must_open_file) {
}
/**
- * Add a new stream to a media file. Can only be called in the
- * read_header function. If the flag AVFMT_NOHEADER is in the format
- * description, then new streams can be added in read_packet too.
+ * Add a new stream to a media file.
*
+ * Can only be called in the read_header() function. If the flag
+ * AVFMTCTX_NOHEADER is in the format context, then new streams
+ * can be added in read_packet too.
*
* @param s media file handle
- * @param id file format dependent stream id
+ * @param id file format dependent stream id
*/
AVStream *av_new_stream(AVFormatContext *s, int id)
{
st = av_mallocz(sizeof(AVStream));
if (!st)
return NULL;
- avcodec_get_context_defaults(&st->codec);
+
+ st->codec= avcodec_alloc_context();
if (s->iformat) {
/* no default bitrate if decoding */
- st->codec.bit_rate = 0;
+ st->codec->bit_rate = 0;
}
st->index = s->nb_streams;
st->id = id;
st->start_time = AV_NOPTS_VALUE;
st->duration = AV_NOPTS_VALUE;
+ st->cur_dts = AV_NOPTS_VALUE;
+
+ /* default pts settings is MPEG like */
+ av_set_pts_info(st, 33, 1, 90000);
+ st->last_IP_pts = AV_NOPTS_VALUE;
+
s->streams[s->nb_streams++] = st;
return st;
}
int ret, i;
AVStream *st;
- /* default pts settings is MPEG like */
- av_set_pts_info(s, 33, 1, 90000);
+ // some sanity checks
+ for(i=0;i<s->nb_streams;i++) {
+ st = s->streams[i];
+
+ switch (st->codec->codec_type) {
+ case CODEC_TYPE_AUDIO:
+ if(st->codec->sample_rate<=0){
+ av_log(s, AV_LOG_ERROR, "sample rate not set\n");
+ return -1;
+ }
+ break;
+ case CODEC_TYPE_VIDEO:
+ if(st->codec->time_base.num<=0 || st->codec->time_base.den<=0){ //FIXME audio too?
+ av_log(s, AV_LOG_ERROR, "time base not set\n");
+ return -1;
+ }
+ if(st->codec->width<=0 || st->codec->height<=0){
+ av_log(s, AV_LOG_ERROR, "dimensions not set\n");
+ return -1;
+ }
+ break;
+ }
+ }
+
ret = s->oformat->write_header(s);
if (ret < 0)
return ret;
/* init PTS generation */
for(i=0;i<s->nb_streams;i++) {
+ int64_t den = AV_NOPTS_VALUE;
st = s->streams[i];
- switch (st->codec.codec_type) {
+ switch (st->codec->codec_type) {
case CODEC_TYPE_AUDIO:
- av_frac_init(&st->pts, 0, 0,
- (int64_t)s->pts_num * st->codec.sample_rate);
+ den = (int64_t)st->time_base.num * st->codec->sample_rate;
break;
case CODEC_TYPE_VIDEO:
- av_frac_init(&st->pts, 0, 0,
- (int64_t)s->pts_num * st->codec.frame_rate);
+ den = (int64_t)st->time_base.num * st->codec->time_base.den;
break;
default:
break;
}
+ if (den != AV_NOPTS_VALUE) {
+ if (den <= 0)
+ return AVERROR_INVALIDDATA;
+ av_frac_init(&st->pts, 0, 0, den);
+ }
}
return 0;
}
-/**
- * Write a packet to an output media file. The packet shall contain
- * one audio or video frame.
- *
- * @param s media file handle
- * @param stream_index stream index
- * @param buf buffer containing the frame data
- * @param size size of buffer
- * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
- */
-int av_write_frame(AVFormatContext *s, int stream_index, const uint8_t *buf,
- int size)
-{
- AVStream *st;
- int64_t pts_mask;
- int ret, frame_size;
+//FIXME merge with compute_pkt_fields
+static int compute_pkt_fields2(AVStream *st, AVPacket *pkt){
+ int b_frames = FFMAX(st->codec->has_b_frames, st->codec->max_b_frames);
+ int num, den, frame_size;
- st = s->streams[stream_index];
- pts_mask = (1LL << s->pts_wrap_bits) - 1;
- ret = s->oformat->write_packet(s, stream_index, (uint8_t *)buf, size,
- st->pts.val & pts_mask);
- if (ret < 0)
- return ret;
+// av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts:%lld dts:%lld cur_dts:%lld b:%d size:%d st:%d\n", pkt->pts, pkt->dts, st->cur_dts, b_frames, pkt->size, pkt->stream_index);
+
+/* if(pkt->pts == AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE)
+ return -1;*/
+
+ /* duration field */
+ if (pkt->duration == 0) {
+ compute_frame_duration(&num, &den, st, NULL, pkt);
+ if (den && num) {
+ pkt->duration = av_rescale(1, num * (int64_t)st->time_base.den, den * (int64_t)st->time_base.num);
+ }
+ }
+
+ //XXX/FIXME this is a temporary hack until all encoders output pts
+ if((pkt->pts == 0 || pkt->pts == AV_NOPTS_VALUE) && pkt->dts == AV_NOPTS_VALUE && !b_frames){
+ pkt->dts=
+// pkt->pts= st->cur_dts;
+ pkt->pts= st->pts.val;
+ }
+
+ //calculate dts from pts
+ if(pkt->pts != AV_NOPTS_VALUE && pkt->dts == AV_NOPTS_VALUE){
+ if(b_frames){
+ if(st->last_IP_pts == AV_NOPTS_VALUE){
+ st->last_IP_pts= -pkt->duration;
+ }
+ if(st->last_IP_pts < pkt->pts){
+ pkt->dts= st->last_IP_pts;
+ st->last_IP_pts= pkt->pts;
+ }else
+ pkt->dts= pkt->pts;
+ }else
+ pkt->dts= pkt->pts;
+ }
+
+ if(st->cur_dts && st->cur_dts != AV_NOPTS_VALUE && st->cur_dts >= pkt->dts){
+ av_log(NULL, AV_LOG_ERROR, "error, non monotone timestamps %Ld >= %Ld\n", st->cur_dts, pkt->dts);
+ return -1;
+ }
+ if(pkt->dts != AV_NOPTS_VALUE && pkt->pts != AV_NOPTS_VALUE && pkt->pts < pkt->dts){
+ av_log(NULL, AV_LOG_ERROR, "error, pts < dts\n");
+ return -1;
+ }
+
+// av_log(NULL, AV_LOG_DEBUG, "av_write_frame: pts2:%lld dts2:%lld\n", pkt->pts, pkt->dts);
+ st->cur_dts= pkt->dts;
+ st->pts.val= pkt->dts;
/* update pts */
- switch (st->codec.codec_type) {
+ switch (st->codec->codec_type) {
case CODEC_TYPE_AUDIO:
- if (st->codec.frame_size <= 1) {
- frame_size = size / st->codec.channels;
- /* specific hack for pcm codecs because no frame size is provided */
- switch(st->codec.codec_id) {
- case CODEC_ID_PCM_S16LE:
- case CODEC_ID_PCM_S16BE:
- case CODEC_ID_PCM_U16LE:
- case CODEC_ID_PCM_U16BE:
- frame_size >>= 1;
- break;
- default:
- break;
- }
- } else {
- frame_size = st->codec.frame_size;
+ frame_size = get_audio_frame_size(st->codec, pkt->size);
+
+ /* HACK/FIXME, we skip the initial 0-size packets as they are most likely equal to the encoder delay,
+ but it would be better if we had the real timestamps from the encoder */
+ if (frame_size >= 0 && (pkt->size || st->pts.num!=st->pts.den>>1 || st->pts.val)) {
+ av_frac_add(&st->pts, (int64_t)st->time_base.den * frame_size);
}
- av_frac_add(&st->pts,
- (int64_t)s->pts_den * frame_size);
break;
case CODEC_TYPE_VIDEO:
- av_frac_add(&st->pts,
- (int64_t)s->pts_den * st->codec.frame_rate_base);
+ av_frac_add(&st->pts, (int64_t)st->time_base.den * st->codec->time_base.num);
break;
default:
break;
}
+ return 0;
+}
+
+static void truncate_ts(AVStream *st, AVPacket *pkt){
+ int64_t pts_mask = (2LL << (st->pts_wrap_bits-1)) - 1;
+
+// if(pkt->dts < 0)
+// pkt->dts= 0; //this happens for low_delay=0 and b frames, FIXME, needs further invstigation about what we should do here
+
+ pkt->pts &= pts_mask;
+ pkt->dts &= pts_mask;
+}
+
+/**
+ * Write a packet to an output media file.
+ *
+ * The packet shall contain one audio or video frame.
+ *
+ * @param s media file handle
+ * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
+ * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
+ */
+int av_write_frame(AVFormatContext *s, AVPacket *pkt)
+{
+ int ret;
+
+ ret=compute_pkt_fields2(s->streams[pkt->stream_index], pkt);
+ if(ret<0)
+ return ret;
+
+ truncate_ts(s->streams[pkt->stream_index], pkt);
+
+ ret= s->oformat->write_packet(s, pkt);
+ if(!ret)
+ ret= url_ferror(&s->pb);
return ret;
}
/**
- * write the stream trailer to an output media file and and free the
- * file private data.
+ * interleave_packet implementation which will interleave per DTS.
+ * packets with pkt->destruct == av_destruct_packet will be freed inside this function.
+ * so they cannot be used after it, note calling av_free_packet() on them is still safe
+ */
+static int av_interleave_packet_per_dts(AVFormatContext *s, AVPacket *out, AVPacket *pkt, int flush){
+ AVPacketList *pktl, **next_point, *this_pktl;
+ int stream_count=0;
+ int streams[MAX_STREAMS];
+
+ if(pkt){
+ AVStream *st= s->streams[ pkt->stream_index];
+
+// assert(pkt->destruct != av_destruct_packet); //FIXME
+
+ this_pktl = av_mallocz(sizeof(AVPacketList));
+ this_pktl->pkt= *pkt;
+ if(pkt->destruct == av_destruct_packet)
+ pkt->destruct= NULL; // non shared -> must keep original from being freed
+ else
+ av_dup_packet(&this_pktl->pkt); //shared -> must dup
+
+ next_point = &s->packet_buffer;
+ while(*next_point){
+ AVStream *st2= s->streams[ (*next_point)->pkt.stream_index];
+ int64_t left= st2->time_base.num * (int64_t)st ->time_base.den;
+ int64_t right= st ->time_base.num * (int64_t)st2->time_base.den;
+ if((*next_point)->pkt.dts * left > pkt->dts * right) //FIXME this can overflow
+ break;
+ next_point= &(*next_point)->next;
+ }
+ this_pktl->next= *next_point;
+ *next_point= this_pktl;
+ }
+
+ memset(streams, 0, sizeof(streams));
+ pktl= s->packet_buffer;
+ while(pktl){
+//av_log(s, AV_LOG_DEBUG, "show st:%d dts:%lld\n", pktl->pkt.stream_index, pktl->pkt.dts);
+ if(streams[ pktl->pkt.stream_index ] == 0)
+ stream_count++;
+ streams[ pktl->pkt.stream_index ]++;
+ pktl= pktl->next;
+ }
+
+ if(s->nb_streams == stream_count || (flush && stream_count)){
+ pktl= s->packet_buffer;
+ *out= pktl->pkt;
+
+ s->packet_buffer= pktl->next;
+ av_freep(&pktl);
+ return 1;
+ }else{
+ av_init_packet(out);
+ return 0;
+ }
+}
+
+/**
+ * Interleaves a AVPacket correctly so it can be muxed.
+ * @param out the interleaved packet will be output here
+ * @param in the input packet
+ * @param flush 1 if no further packets are available as input and all
+ * remaining packets should be output
+ * @return 1 if a packet was output, 0 if no packet could be output,
+ * < 0 if an error occured
+ */
+static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
+ if(s->oformat->interleave_packet)
+ return s->oformat->interleave_packet(s, out, in, flush);
+ else
+ return av_interleave_packet_per_dts(s, out, in, flush);
+}
+
+/**
+ * Writes a packet to an output media file ensuring correct interleaving.
+ *
+ * The packet must contain one audio or video frame.
+ * If the packets are already correctly interleaved the application should
+ * call av_write_frame() instead as its slightly faster, its also important
+ * to keep in mind that completly non interleaved input will need huge amounts
+ * of memory to interleave with this, so its prefereable to interleave at the
+ * demuxer level
+ *
+ * @param s media file handle
+ * @param pkt the packet, which contains the stream_index, buf/buf_size, dts/pts, ...
+ * @return < 0 if error, = 0 if OK, 1 if end of stream wanted.
+ */
+int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt){
+ AVStream *st= s->streams[ pkt->stream_index];
+
+ //FIXME/XXX/HACK drop zero sized packets
+ if(st->codec->codec_type == CODEC_TYPE_AUDIO && pkt->size==0)
+ return 0;
+
+//av_log(NULL, AV_LOG_DEBUG, "av_interleaved_write_frame %d %Ld %Ld\n", pkt->size, pkt->dts, pkt->pts);
+ if(compute_pkt_fields2(st, pkt) < 0)
+ return -1;
+
+ if(pkt->dts == AV_NOPTS_VALUE)
+ return -1;
+
+ for(;;){
+ AVPacket opkt;
+ int ret= av_interleave_packet(s, &opkt, pkt, 0);
+ if(ret<=0) //FIXME cleanup needed for ret<0 ?
+ return ret;
+
+ truncate_ts(s->streams[opkt.stream_index], &opkt);
+ ret= s->oformat->write_packet(s, &opkt);
+
+ av_free_packet(&opkt);
+ pkt= NULL;
+
+ if(ret<0)
+ return ret;
+ if(url_ferror(&s->pb))
+ return url_ferror(&s->pb);
+ }
+}
+
+/**
+ * @brief Write the stream trailer to an output media file and
+ * free the file private data.
*
* @param s media file handle
- * @return 0 if OK. AVERROR_xxx if error. */
+ * @return 0 if OK. AVERROR_xxx if error.
+ */
int av_write_trailer(AVFormatContext *s)
{
- int ret;
+ int ret, i;
+
+ for(;;){
+ AVPacket pkt;
+ ret= av_interleave_packet(s, &pkt, NULL, 1);
+ if(ret<0) //FIXME cleanup needed for ret<0 ?
+ goto fail;
+ if(!ret)
+ break;
+
+ truncate_ts(s->streams[pkt.stream_index], &pkt);
+ ret= s->oformat->write_packet(s, &pkt);
+
+ av_free_packet(&pkt);
+
+ if(ret<0)
+ goto fail;
+ if(url_ferror(&s->pb))
+ goto fail;
+ }
+
ret = s->oformat->write_trailer(s);
+fail:
+ if(ret == 0)
+ ret=url_ferror(&s->pb);
+ for(i=0;i<s->nb_streams;i++)
+ av_freep(&s->streams[i]->priv_data);
av_freep(&s->priv_data);
return ret;
}
int i, flags;
char buf[256];
- fprintf(stderr, "%s #%d, %s, %s '%s':\n",
+ av_log(NULL, AV_LOG_INFO, "%s #%d, %s, %s '%s':\n",
is_output ? "Output" : "Input",
index,
is_output ? ic->oformat->name : ic->iformat->name,
is_output ? "to" : "from", url);
if (!is_output) {
- fprintf(stderr, " Duration: ");
+ av_log(NULL, AV_LOG_INFO, " Duration: ");
if (ic->duration != AV_NOPTS_VALUE) {
int hours, mins, secs, us;
secs = ic->duration / AV_TIME_BASE;
secs %= 60;
hours = mins / 60;
mins %= 60;
- fprintf(stderr, "%02d:%02d:%02d.%01d", hours, mins, secs,
+ av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%01d", hours, mins, secs,
(10 * us) / AV_TIME_BASE);
} else {
- fprintf(stderr, "N/A");
+ av_log(NULL, AV_LOG_INFO, "N/A");
}
- fprintf(stderr, ", bitrate: ");
+ if (ic->start_time != AV_NOPTS_VALUE) {
+ int secs, us;
+ av_log(NULL, AV_LOG_INFO, ", start: ");
+ secs = ic->start_time / AV_TIME_BASE;
+ us = ic->start_time % AV_TIME_BASE;
+ av_log(NULL, AV_LOG_INFO, "%d.%06d",
+ secs, (int)av_rescale(us, 1000000, AV_TIME_BASE));
+ }
+ av_log(NULL, AV_LOG_INFO, ", bitrate: ");
if (ic->bit_rate) {
- fprintf(stderr,"%d kb/s", ic->bit_rate / 1000);
+ av_log(NULL, AV_LOG_INFO,"%d kb/s", ic->bit_rate / 1000);
} else {
- fprintf(stderr, "N/A");
+ av_log(NULL, AV_LOG_INFO, "N/A");
}
- fprintf(stderr, "\n");
+ av_log(NULL, AV_LOG_INFO, "\n");
}
for(i=0;i<ic->nb_streams;i++) {
AVStream *st = ic->streams[i];
- avcodec_string(buf, sizeof(buf), &st->codec, is_output);
- fprintf(stderr, " Stream #%d.%d", index, i);
+ avcodec_string(buf, sizeof(buf), st->codec, is_output);
+ av_log(NULL, AV_LOG_INFO, " Stream #%d.%d", index, i);
/* the pid is an important information, so we display it */
/* XXX: add a generic system */
if (is_output)
else
flags = ic->iformat->flags;
if (flags & AVFMT_SHOW_IDS) {
- fprintf(stderr, "[0x%x]", st->id);
+ av_log(NULL, AV_LOG_INFO, "[0x%x]", st->id);
+ }
+ if (strlen(st->language) > 0) {
+ av_log(NULL, AV_LOG_INFO, "(%s)", st->language);
}
- fprintf(stderr, ": %s\n", buf);
+ av_log(NULL, AV_LOG_INFO, ": %s\n", buf);
}
}
{ "4cif", 704, 576, 0, 0 },
};
+/**
+ * parses width and height out of string str.
+ */
int parse_image_size(int *width_ptr, int *height_ptr, const char *str)
{
int i;
return 0;
}
+/**
+ * Converts frame rate from string to a fraction.
+ *
+ * First we try to get an exact integer or fractional frame rate.
+ * If this fails we convert the frame rate to a double and return
+ * an approximate fraction using the DEFAULT_FRAME_RATE_BASE.
+ */
int parse_frame_rate(int *frame_rate, int *frame_rate_base, const char *arg)
{
int i;
/* Then, we try to parse it as fraction */
cp = strchr(arg, '/');
+ if (!cp)
+ cp = strchr(arg, ':');
if (cp) {
char* cpp;
*frame_rate = strtol(arg, &cpp, 10);
}
else {
/* Finally we give up and parse it as double */
- *frame_rate_base = DEFAULT_FRAME_RATE_BASE;
+ *frame_rate_base = DEFAULT_FRAME_RATE_BASE; //FIXME use av_d2q()
*frame_rate = (int)(strtod(arg, 0) * (*frame_rate_base) + 0.5);
}
if (!*frame_rate || !*frame_rate_base)
return 0;
}
-/* Syntax:
+/**
+ * Converts date string to number of seconds since Jan 1st, 1970.
+ *
+ * @code
+ * Syntax:
* - If not a duration:
* [{YYYY-MM-DD|YYYYMMDD}]{T| }{HH[:MM[:SS[.m...]]][Z]|HH[MM[SS[.m...]]][Z]}
* Time is localtime unless Z is suffixed to the end. In this case GMT
* Return the date in micro seconds since 1970
- * - If duration:
+ *
+ * - If a duration:
* HH[:MM[:SS[.m...]]]
* S+[.m...]
+ * @endcode
*/
int64_t parse_date(const char *datestr, int duration)
{
const char *q;
int is_utc, len;
char lastch;
+ int negative = 0;
+
+#undef time
time_t now = time(0);
len = strlen(datestr);
}
}
} else {
+ if (p[0] == '-') {
+ negative = 1;
+ ++p;
+ }
q = small_strptime(p, time_fmt[0], &dt);
if (!q) {
dt.tm_sec = strtol(p, (char **)&q, 10);
}
t += val;
}
- return t;
+ return negative ? -t : t;
}
-/* syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done. Return
- 1 if found */
+/**
+ * Attempts to find a specific tag in a URL.
+ *
+ * syntax: '?tag1=val1&tag2=val2...'. Little URL decoding is done.
+ * Return 1 if found.
+ */
int find_info_tag(char *arg, int arg_size, const char *tag1, const char *info)
{
const char *p;
return 0;
}
-/* Return in 'buf' the path with '%d' replaced by number. Also handles
- the '%0nd' format where 'n' is the total number of digits and
- '%%'. Return 0 if OK, and -1 if format error */
+/**
+ * Returns in 'buf' the path with '%d' replaced by number.
+ *
+ * Also handles the '%0nd' format where 'n' is the total number
+ * of digits and '%%'. Return 0 if OK, and -1 if format error.
+ */
int get_frame_filename(char *buf, int buf_size,
const char *path, int number)
{
}
/**
- *
- * Print on stdout a nice hexa dump of a buffer
+ * Print nice hexa dump of a buffer
+ * @param f stream for output
* @param buf buffer
* @param size buffer size
*/
-void av_hex_dump(uint8_t *buf, int size)
+void av_hex_dump(FILE *f, uint8_t *buf, int size)
{
int len, i, j, c;
len = size - i;
if (len > 16)
len = 16;
- printf("%08x ", i);
+ fprintf(f, "%08x ", i);
for(j=0;j<16;j++) {
if (j < len)
- printf(" %02x", buf[i+j]);
+ fprintf(f, " %02x", buf[i+j]);
else
- printf(" ");
+ fprintf(f, " ");
}
- printf(" ");
+ fprintf(f, " ");
for(j=0;j<len;j++) {
c = buf[i+j];
if (c < ' ' || c > '~')
c = '.';
- printf("%c", c);
+ fprintf(f, "%c", c);
}
- printf("\n");
+ fprintf(f, "\n");
}
}
+/**
+ * Print on 'f' a nice dump of a packet
+ * @param f stream for output
+ * @param pkt packet to dump
+ * @param dump_payload true if the payload must be displayed too
+ */
+ //FIXME needs to know the time_base
+void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload)
+{
+ fprintf(f, "stream #%d:\n", pkt->stream_index);
+ fprintf(f, " keyframe=%d\n", ((pkt->flags & PKT_FLAG_KEY) != 0));
+ fprintf(f, " duration=%0.3f\n", (double)pkt->duration / AV_TIME_BASE);
+ /* DTS is _always_ valid after av_read_frame() */
+ fprintf(f, " dts=");
+ if (pkt->dts == AV_NOPTS_VALUE)
+ fprintf(f, "N/A");
+ else
+ fprintf(f, "%0.3f", (double)pkt->dts / AV_TIME_BASE);
+ /* PTS may be not known if B frames are present */
+ fprintf(f, " pts=");
+ if (pkt->pts == AV_NOPTS_VALUE)
+ fprintf(f, "N/A");
+ else
+ fprintf(f, "%0.3f", (double)pkt->pts / AV_TIME_BASE);
+ fprintf(f, "\n");
+ fprintf(f, " size=%d\n", pkt->size);
+ if (dump_payload)
+ av_hex_dump(f, pkt->data, pkt->size);
+}
+
void url_split(char *proto, int proto_size,
+ char *authorization, int authorization_size,
char *hostname, int hostname_size,
int *port_ptr,
char *path, int path_size,
}
if (proto_size > 0)
*q = '\0';
+ if (authorization_size > 0)
+ authorization[0] = '\0';
if (*p == '\0') {
if (proto_size > 0)
proto[0] = '\0';
hostname[0] = '\0';
p = url;
} else {
+ char *at,*slash; // PETR: position of '@' character and '/' character
+
p++;
if (*p == '/')
p++;
if (*p == '/')
p++;
- q = hostname;
- while (*p != ':' && *p != '/' && *p != '?' && *p != '\0') {
- if ((q - hostname) < hostname_size - 1)
+ at = strchr(p,'@'); // PETR: get the position of '@'
+ slash = strchr(p,'/'); // PETR: get position of '/' - end of hostname
+ if (at && slash && at > slash) at = NULL; // PETR: not interested in '@' behind '/'
+
+ q = at ? authorization : hostname; // PETR: if '@' exists starting with auth.
+
+ while ((at || *p != ':') && *p != '/' && *p != '?' && *p != '\0') { // PETR:
+ if (*p == '@') { // PETR: passed '@'
+ if (authorization_size > 0)
+ *q = '\0';
+ q = hostname;
+ at = NULL;
+ } else if (!at) { // PETR: hostname
+ if ((q - hostname) < hostname_size - 1)
+ *q++ = *p;
+ } else {
+ if ((q - authorization) < authorization_size - 1)
*q++ = *p;
+ }
p++;
}
if (hostname_size > 0)
}
/**
- * Set the pts for a given stream
+ * Set the pts for a given stream.
+ *
* @param s stream
* @param pts_wrap_bits number of bits effectively used by the pts
* (used for wrap control, 33 is the value for MPEG)
* @param pts_num numerator to convert to seconds (MPEG: 1)
* @param pts_den denominator to convert to seconds (MPEG: 90000)
*/
-void av_set_pts_info(AVFormatContext *s, int pts_wrap_bits,
+void av_set_pts_info(AVStream *s, int pts_wrap_bits,
int pts_num, int pts_den)
{
s->pts_wrap_bits = pts_wrap_bits;
- s->pts_num = pts_num;
- s->pts_den = pts_den;
+ s->time_base.num = pts_num;
+ s->time_base.den = pts_den;
}
/* fraction handling */
/**
- * f = val + (num / den) + 0.5. 'num' is normalized so that it is such
- * as 0 <= num < den.
+ * f = val + (num / den) + 0.5.
+ *
+ * 'num' is normalized so that it is such as 0 <= num < den.
*
* @param f fractional number
* @param val integer value
f->den = den;
}
-/* set f to (val + 0.5) */
+/**
+ * Set f to (val + 0.5).
+ */
void av_frac_set(AVFrac *f, int64_t val)
{
f->val = val;
}
/**
- * Fractionnal addition to f: f = f + (incr / f->den)
+ * Fractionnal addition to f: f = f + (incr / f->den).
*
* @param f fractional number
* @param incr increment, can be positive or negative
img_fmt->next = NULL;
}
-/* guess image format */
+/**
+ * Guesses image format based on data in the image.
+ */
AVImageFormat *av_probe_image_format(AVProbeData *pd)
{
AVImageFormat *fmt1, *fmt;
return fmt;
}
+/**
+ * Guesses image format based on file name extensions.
+ */
AVImageFormat *guess_image_format(const char *filename)
{
AVImageFormat *fmt1;
projects / ffmpeg / blobdiff