/*
- * Various utilities for ffmpeg system
+ * various utility functions for use within FFmpeg
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
*
* This file is part of FFmpeg.
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "avformat.h"
-#include "opt.h"
-#include "avstring.h"
+#include "libavcodec/opt.h"
+#include "libavutil/avstring.h"
#include "riff.h"
#include <sys/time.h>
#include <time.h>
/**
* @file libavformat/utils.c
- * Various utility functions for using ffmpeg library.
+ * various utility functions for use within FFmpeg
*/
static void av_frac_init(AVFrac *f, int64_t val, int64_t num, int64_t den);
static void av_frac_add(AVFrac *f, int64_t incr);
-/** head of registered input format linked list. */
+/** head of registered input format linked list */
AVInputFormat *first_iformat = NULL;
-/** head of registered output format linked list. */
+/** head of registered output format linked list */
AVOutputFormat *first_oformat = NULL;
AVInputFormat *av_iformat_next(AVInputFormat *f)
return guess_format("image2", NULL, NULL);
}
#endif
- /* find the proper file type */
+ /* Find the proper file type. */
fmt_found = NULL;
score_max = 0;
fmt = first_oformat;
{
if (pkt->destruct != av_destruct_packet) {
uint8_t *data;
- /* we duplicate the packet and don't forget to put the padding
- again */
+ /* We duplicate the packet and don't forget to add the padding again. */
if((unsigned)pkt->size > (unsigned)pkt->size + FF_INPUT_BUFFER_PADDING_SIZE)
return AVERROR(ENOMEM);
data = av_malloc(pkt->size + FF_INPUT_BUFFER_PADDING_SIZE);
if (score > *score_max) {
*score_max = score;
fmt = fmt1;
- }
+ }else if (score == *score_max)
+ fmt = NULL;
}
return fmt;
}
{"year", "set the year", OFFSET(year), FF_OPT_TYPE_INT, DEFAULT, INT_MIN, INT_MAX, E},
{"analyzeduration", "how many microseconds are analyzed to estimate duration", OFFSET(max_analyze_duration), FF_OPT_TYPE_INT, 3*AV_TIME_BASE, 0, INT_MAX, D},
{"cryptokey", "decryption key", OFFSET(key), FF_OPT_TYPE_BINARY, 0, 0, 0, D},
+{"indexmem", "max memory used for timestamp index (per stream)", OFFSET(max_index_size), FF_OPT_TYPE_INT, 1<<20, 0, INT_MAX, D},
+{"rtbufsize", "max memory used for buffering real-time frames", OFFSET(max_picture_buffer), FF_OPT_TYPE_INT, 3041280, 0, INT_MAX, D}, /* defaults to 1s of 15fps 352x288 YUYV422 video */
{NULL},
};
return err;
}
-/** Size of probe buffer, for guessing file type from file contents. */
+/** size of probe buffer, for guessing file type from file contents */
#define PROBE_BUF_MIN 2048
#define PROBE_BUF_MAX (1<<20)
pd->buf_size = 0;
if (!fmt) {
- /* guess format if no file can be opened */
+ /* guess format if no file can be opened */
fmt = av_probe_input_format(pd, 0);
}
- /* do not open file if the format does not need it. XXX: specific
+ /* Do not open file if the format does not need it. XXX: specific
hack needed to handle RTSP/TCP */
if (!fmt || !(fmt->flags & AVFMT_NOFILE)) {
/* if no file needed do not try to open one */
goto fail;
}
- /* check filename in case of an image number is expected */
+ /* check filename in case an image number is expected */
if (fmt->flags & AVFMT_NEEDNUMBER) {
if (!av_filename_number_test(filename)) {
err = AVERROR_NUMEXPECTED;
AVStream *st;
av_init_packet(pkt);
ret= s->iformat->read_packet(s, pkt);
+ if (ret < 0)
+ return ret;
st= s->streams[pkt->stream_index];
switch(st->codec->codec_type){
/**********************************************************/
/**
- * Get the number of samples of an audio frame. Return (-1) if error.
+ * Get the number of samples of an audio frame. Return -1 on error.
*/
static int get_audio_frame_size(AVCodecContext *enc, int size)
{
/**
- * Return the frame duration in seconds, return 0 if not available.
+ * 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)
st->start_time = pts;
}
+static void update_initial_durations(AVFormatContext *s, AVStream *st, AVPacket *pkt)
+{
+ AVPacketList *pktl= s->packet_buffer;
+
+ assert(pkt->duration && !st->cur_dts);
+
+ for(; pktl; pktl= pktl->next){
+ if(pktl->pkt.stream_index != pkt->stream_index)
+ continue;
+ if(pktl->pkt.pts == pktl->pkt.dts && pktl->pkt.dts == AV_NOPTS_VALUE
+ && !pktl->pkt.duration){
+ pktl->pkt.pts= pktl->pkt.dts= st->cur_dts;
+ st->cur_dts += pkt->duration;
+ pktl->pkt.duration= pkt->duration;
+ }else
+ break;
+ }
+}
+
static void compute_pkt_fields(AVFormatContext *s, AVStream *st,
AVCodecParserContext *pc, AVPacket *pkt)
{
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(st->cur_dts == 0 && pkt->duration != 0)
+ update_initial_durations(s, st, pkt);
}
}
- /* correct timestamps with byte offset if demuxers only have timestamps on packet boundaries */
+ /* correct timestamps with byte offset if demuxers only have timestamps
+ on packet boundaries */
if(pc && st->need_parsing == AVSTREAM_PARSE_TIMESTAMPS && pkt->size){
/* this will estimate bitrate based on this frame's duration and size */
offset = av_rescale(pc->offset, pkt->duration, pkt->size);
pkt->dts += offset;
}
- /* do we have a video B frame ? */
+ /* do we have a video B-frame ? */
delay= st->codec->has_b_frames;
presentation_delayed = 0;
/* XXX: need has_b_frame, but cannot get it if the codec is
// av_log(NULL, AV_LOG_DEBUG, "IN delayed:%d pts:%"PRId64", dts:%"PRId64" cur_dts:%"PRId64" 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(delay <=1){
+ if(delay==0 || (delay==1 && pc)){
if (presentation_delayed) {
- /* DTS = decompression time stamp */
- /* PTS = presentation time stamp */
+ /* DTS = decompression timestamp */
+ /* PTS = presentation timestamp */
if (pkt->dts == AV_NOPTS_VALUE)
pkt->dts = st->last_IP_pts;
update_initial_timestamps(s, pkt->stream_index, pkt->dts, pkt->pts);
pkt->dts = st->cur_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 */
+ of the frame we are displaying, i.e. the last I- or P-frame */
if (st->last_IP_duration == 0)
st->last_IP_duration = pkt->duration;
st->cur_dts = pkt->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 */
+ by knowing the future */
} 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= FFABS(st->cur_dts - pkt->duration - pkt->pts);
pkt->flags |= PKT_FLAG_KEY;
else if (pc) {
pkt->flags = 0;
- /* key frame computation */
+ /* keyframe computation */
if (pc->pict_type == FF_I_TYPE)
pkt->flags |= PKT_FLAG_KEY;
}
compute_pkt_fields(s, st, st->parser, pkt);
if((s->iformat->flags & AVFMT_GENERIC_INDEX) && pkt->flags & PKT_FLAG_KEY){
+ ff_reduce_index(s, st->index);
av_add_index_entry(st, st->parser->frame_offset, pkt->dts,
0, 0, AVINDEX_KEYFRAME);
}
goto got_packet;
}
}
- /* no more packets: really terminates parsing */
+ /* no more packets: really terminate parsing */
return ret;
}
+ if(s->cur_pkt.pts != AV_NOPTS_VALUE &&
+ s->cur_pkt.dts != AV_NOPTS_VALUE &&
+ s->cur_pkt.pts < s->cur_pkt.dts){
+ av_log(s, AV_LOG_WARNING, "Invalid timestamps stream=%d, pts=%"PRId64", dts=%"PRId64", size=%d\n",
+ s->cur_pkt.stream_index,
+ s->cur_pkt.pts,
+ s->cur_pkt.dts,
+ s->cur_pkt.size);
+// av_free_packet(&s->cur_pkt);
+// return -1;
+ }
+
st = s->streams[s->cur_pkt.stream_index];
if(st->codec->debug & FF_DEBUG_PTS)
av_log(s, AV_LOG_DEBUG, "av_read_packet stream=%d, pts=%"PRId64", dts=%"PRId64", size=%d\n",
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 */
+ /* no parser available: just output the raw packets */
st->need_parsing = AVSTREAM_PARSE_NONE;
}else if(st->need_parsing == AVSTREAM_PARSE_HEADERS){
st->parser->flags |= PARSER_FLAG_COMPLETE_FRAMES;
}
if(st->parser && (s->iformat->flags & AVFMT_GENERIC_INDEX)){
- st->parser->last_frame_offset=
+ st->parser->next_frame_offset=
st->parser->cur_offset= s->cur_pkt.pos;
}
}
}
}
+void ff_reduce_index(AVFormatContext *s, int stream_index)
+{
+ AVStream *st= s->streams[stream_index];
+ unsigned int max_entries= s->max_index_size / sizeof(AVIndexEntry);
+
+ if((unsigned)st->nb_index_entries >= max_entries){
+ int i;
+ for(i=0; 2*i<st->nb_index_entries; i++)
+ st->index_entries[i]= st->index_entries[2*i];
+ st->nb_index_entries= i;
+ }
+}
+
int av_add_index_entry(AVStream *st,
int64_t pos, int64_t timestamp, int size, int distance, int flags)
{
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= 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];
// 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
+ /* linear search if bisection failed, can only happen if there
+ are very few or no keyframes between min/max */
pos=pos_min;
}
if(pos <= pos_min)
int i;
AVPacket pkt;
- if(st->index_entries && st->nb_index_entries){
+ if(st->nb_index_entries){
+ assert(st->index_entries);
ie= &st->index_entries[st->nb_index_entries-1];
url_fseek(s->pb, ie->pos, SEEK_SET);
av_update_cur_dts(s, st, ie->timestamp);
duration = INT64_MIN;
for(i = 0;i < ic->nb_streams; i++) {
st = ic->streams[i];
- if (st->start_time != AV_NOPTS_VALUE) {
+ if (st->start_time != AV_NOPTS_VALUE && st->time_base.den) {
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 (duration != INT64_MIN) {
ic->duration = duration;
if (ic->file_size > 0) {
- /* compute the bit rate */
+ /* compute the bitrate */
ic->bit_rate = (double)ic->file_size * 8.0 * AV_TIME_BASE /
(double)ic->duration;
}
/* get accurate estimate from the PTSes */
av_estimate_timings_from_pts(ic, old_offset);
} else if (av_has_duration(ic)) {
- /* at least one components has timings - we use them for all
+ /* at least one component has timings - we use them for all
the components */
fill_all_stream_timings(ic);
} else {
- /* less precise: use bit rate info */
+ /* less precise: use bitrate info */
av_estimate_timings_from_bit_rate(ic);
}
av_update_stream_timings(ic);
val = 1;
break;
}
- return (enc->codec_id != CODEC_ID_NONE && val != 0);
+ return enc->codec_id != CODEC_ID_NONE && val != 0;
}
static int try_decode_frame(AVStream *st, const uint8_t *data, int size)
switch(st->codec->codec_type) {
case CODEC_TYPE_VIDEO:
ret = avcodec_decode_video(st->codec, &picture,
- &got_picture, (uint8_t *)data, size);
+ &got_picture, data, size);
break;
case CODEC_TYPE_AUDIO:
data_size = FFMAX(size, AVCODEC_MAX_AUDIO_FRAME_SIZE);
if (!samples)
goto fail;
ret = avcodec_decode_audio2(st->codec, samples,
- &data_size, (uint8_t *)data, size);
+ &data_size, data, size);
av_free(samples);
break;
default:
return CODEC_ID_NONE;
}
+static void compute_chapters_end(AVFormatContext *s)
+{
+ unsigned int i;
+
+ for (i=0; i+1<s->nb_chapters; i++)
+ if (s->chapters[i]->end == AV_NOPTS_VALUE) {
+ assert(s->chapters[i]->start <= s->chapters[i+1]->start);
+ assert(!av_cmp_q(s->chapters[i]->time_base, s->chapters[i+1]->time_base));
+ s->chapters[i]->end = s->chapters[i+1]->start;
+ }
+
+ if (s->nb_chapters && s->chapters[i]->end == AV_NOPTS_VALUE) {
+ assert(s->start_time != AV_NOPTS_VALUE);
+ assert(s->duration > 0);
+ s->chapters[i]->end = av_rescale_q(s->start_time + s->duration,
+ AV_TIME_BASE_Q,
+ s->chapters[i]->time_base);
+ }
+}
+
/* absolute maximum size we read until we abort */
#define MAX_READ_SIZE 5000000
else return ((int[]){24,30,60,12,15})[i-60*12]*1000*12;
}
+/*
+ * Is the time base unreliable.
+ * This is a heuristic to balance between quick acceptance of the values in
+ * the headers vs. some extra checks.
+ * Old DivX and Xvid often have nonsense timebases like 1fps or 2fps.
+ * MPEG-2 commonly misuses field repeat flags to store different framerates.
+ * And there are "variable" fps files this needs to detect as well.
+ */
+static int tb_unreliable(AVCodecContext *c){
+ if( c->time_base.den >= 101L*c->time_base.num
+ || c->time_base.den < 5L*c->time_base.num
+/* || c->codec_tag == ff_get_fourcc("DIVX")
+ || c->codec_tag == ff_get_fourcc("XVID")*/
+ || c->codec_id == CODEC_ID_MPEG2VIDEO)
+ return 1;
+ return 0;
+}
+
int av_find_stream_info(AVFormatContext *ic)
{
int i, count, ret, read_size, j;
if (!has_codec_parameters(st->codec))
break;
/* variable fps and no guess at the real fps */
- if( (st->codec->time_base.den >= 101LL*st->codec->time_base.num || st->codec->codec_id == CODEC_ID_MPEG2VIDEO)
+ if( tb_unreliable(st->codec)
&& duration_count[i]<20 && st->codec->codec_type == CODEC_TYPE_VIDEO)
break;
if(st->parser && st->parser->parser->split && !st->codec->extradata)
// if(st->codec->codec_type == CODEC_TYPE_VIDEO)
// av_log(NULL, AV_LOG_ERROR, "%f\n", dur);
if(duration_count[index] < 2)
- memset(duration_error, 0, MAX_STREAMS * sizeof(*duration_error));
+ memset(duration_error[index], 0, sizeof(*duration_error));
for(i=1; i<MAX_STD_TIMEBASES; i++){
int framerate= get_std_framerate(i);
int ticks= lrintf(dur*framerate/(1001*12));
/* 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. */
+ it takes longer and uses more memory. For MPEG-4, 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 ||
count++;
}
- // close codecs which where opened in try_decode_frame()
+ // close codecs which were opened in try_decode_frame()
for(i=0;i<ic->nb_streams;i++) {
st = ic->streams[i];
if(st->codec->codec)
st->codec->codec_tag= avcodec_pix_fmt_to_codec_tag(st->codec->pix_fmt);
if(duration_count[i]
- && (st->codec->time_base.num*101LL <= st->codec->time_base.den || st->codec->codec_id == CODEC_ID_MPEG2VIDEO) /*&&
- //FIXME we should not special case mpeg2, but this needs testing with non mpeg2 ...
+ && tb_unreliable(st->codec) /*&&
+ //FIXME we should not special-case MPEG-2, but this needs testing with non-MPEG-2 ...
st->time_base.num*duration_sum[i]/duration_count[i]*101LL > st->time_base.den*/){
double best_error= 2*av_q2d(st->time_base);
best_error= best_error*best_error*duration_count[i]*1000*12*30;
url_fseek(ic->pb, ic->data_offset, SEEK_SET);
}
+ compute_chapters_end(ic);
+
#if 0
- /* correct DTS for b frame streams with no timestamps */
+ /* 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) {
av_free(st->index_entries);
av_free(st->codec->extradata);
av_free(st->codec);
+ av_free(st->filename);
av_free(st);
}
for(i=s->nb_programs-1; i>=0; i--) {
av_freep(&s->programs[i]->stream_index);
av_freep(&s->programs[i]);
}
+ av_freep(&s->programs);
flush_packet_queue(s);
av_freep(&s->priv_data);
+ while(s->nb_chapters--) {
+ av_free(s->chapters[s->nb_chapters]->title);
+ av_free(s->chapters[s->nb_chapters]);
+ }
+ av_freep(&s->chapters);
av_free(s);
}
st->cur_dts = AV_NOPTS_VALUE;
st->first_dts = AV_NOPTS_VALUE;
- /* default pts settings is MPEG like */
+ /* default pts setting is MPEG-like */
av_set_pts_info(st, 33, 1, 90000);
st->last_IP_pts = AV_NOPTS_VALUE;
for(i=0; i<MAX_REORDER_DELAY+1; i++)
}
}
+AVChapter *ff_new_chapter(AVFormatContext *s, int id, AVRational time_base, int64_t start, int64_t end, const char *title)
+{
+ AVChapter *chapter = NULL;
+ int i;
+
+ for(i=0; i<s->nb_chapters; i++)
+ if(s->chapters[i]->id == id)
+ chapter = s->chapters[i];
+
+ if(!chapter){
+ chapter= av_mallocz(sizeof(AVChapter));
+ if(!chapter)
+ return NULL;
+ dynarray_add(&s->chapters, &s->nb_chapters, chapter);
+ }
+ av_free(chapter->title);
+ chapter->title = av_strdup(title);
+ chapter->id = id;
+ chapter->time_base= time_base;
+ chapter->start = start;
+ chapter->end = end;
+
+ return chapter;
+}
/************************************************************/
/* output media file */
if(st->codec->codec_tag){
//FIXME
//check that tag + id is in the table
- //if neither is in the table -> ok
+ //if neither is in the table -> OK
//if tag is in the table with another id -> FAIL
//if id is in the table with another tag -> FAIL unless strict < ?
}else
case CODEC_TYPE_AUDIO:
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 */
+ /* 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);
}
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->dts= 0; //this happens for low_delay=0 and B-frames, FIXME, needs further investigation about what we should do here
if (pkt->pts != AV_NOPTS_VALUE)
pkt->pts &= pts_mask;
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
+ pkt->destruct= NULL; // not shared -> must keep original from being freed
else
av_dup_packet(&this_pktl->pkt); //shared -> must dup
}
/**
- * Interleaves a AVPacket correctly so it can be muxed.
+ * Interleaves an 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
+ * < 0 if an error occurred
*/
static int av_interleave_packet(AVFormatContext *s, AVPacket *out, AVPacket *in, int flush){
if(s->oformat->interleave_packet)
secs %= 60;
hours = mins / 60;
mins %= 60;
- av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%01d", hours, mins, secs,
- (10 * us) / AV_TIME_BASE);
+ av_log(NULL, AV_LOG_INFO, "%02d:%02d:%02d.%02d", hours, mins, secs,
+ (100 * us) / AV_TIME_BASE);
} else {
av_log(NULL, AV_LOG_INFO, "N/A");
}
}
/**
- * gets the current time in micro seconds.
+ * Gets the current time in microseconds.
*/
int64_t av_gettime(void)
{
PRINT("N/A");
else
PRINT("%0.3f", (double)pkt->dts / AV_TIME_BASE);
- /* PTS may be not known if B frames are present */
+ /* PTS may not be known if B-frames are present. */
PRINT(" pts=");
if (pkt->pts == AV_NOPTS_VALUE)
PRINT("N/A");
char *path, int path_size,
const char *url)
{
- const char *p, *ls, *at, *col, *brk, *q;
+ const char *p, *ls, *at, *col, *brk;
if (port_ptr) *port_ptr = -1;
if (proto_size > 0) proto[0] = 0;
}
/* separate path from hostname */
- if ((ls = strchr(p, '/'))) {
- if ((q = strchr(ls, '?')))
- av_strlcpy(path, ls, FFMIN(path_size, q - ls + 1));
- else
- av_strlcpy(path, ls, path_size);
- } else if (!(ls = strchr(p, '?')))
+ ls = strchr(p, '/');
+ if(!ls)
+ ls = strchr(p, '?');
+ if(ls)
+ av_strlcpy(path, ls, path_size);
+ else
ls = &p[strlen(p)]; // XXX
/* the rest is hostname, use that to parse auth/port */
}
/**
- * Fractionnal addition to f: f = f + (incr / f->den).
+ * Fractional addition to f: f = f + (incr / f->den).
*
* @param f fractional number
* @param incr increment, can be positive or negative
projects / ffmpeg / blobdiff