*/
#include "avformat.h"
#include "avi.h"
+#include "dv.h"
+
+#undef NDEBUG
+#include <assert.h>
//#define DEBUG
+//#define DEBUG_SEEK
+
+typedef struct AVIStream {
+ int64_t frame_offset; /* current frame (video) or byte (audio) counter
+ (used to compute the pts) */
+ int remaining;
+ int packet_size;
-typedef struct AVIIndex {
- unsigned char tag[4];
- unsigned int flags, pos, len;
- struct AVIIndex *next;
-} AVIIndex;
+ int scale;
+ int rate;
+ int sample_size; /* audio only data */
+ int start;
+
+ int cum_len; /* temporary storage (used during seek) */
+
+ int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
+ int prefix_count;
+} AVIStream;
typedef struct {
- int64_t movi_end;
+ int64_t riff_end;
+ int64_t movi_end;
offset_t movi_list;
- AVIIndex *first, *last;
+ int index_loaded;
+ int is_odml;
+ int non_interleaved;
+ int stream_index;
+ DVDemuxContext* dv_demux;
} AVIContext;
+static int avi_load_index(AVFormatContext *s);
+
#ifdef DEBUG
static void print_tag(const char *str, unsigned int tag, int size)
{
}
#endif
-static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
+static int get_riff(AVIContext *avi, ByteIOContext *pb)
{
- AVIContext *avi = s->priv_data;
- ByteIOContext *pb = &s->pb;
- uint32_t tag, tag1;
- int codec_type, stream_index, frame_period, bit_rate, scale, rate;
- unsigned int size;
- int i;
- AVStream *st;
-
+ uint32_t tag;
/* check RIFF header */
tag = get_le32(pb);
if (tag != MKTAG('R', 'I', 'F', 'F'))
return -1;
- get_le32(pb); /* file size */
+ avi->riff_end = get_le32(pb); /* RIFF chunk size */
+ avi->riff_end += url_ftell(pb); /* RIFF chunk end */
tag = get_le32(pb);
- if (tag != MKTAG('A', 'V', 'I', ' '))
+ if (tag != MKTAG('A', 'V', 'I', ' ') && tag != MKTAG('A', 'V', 'I', 'X'))
+ return -1;
+
+ return 0;
+}
+
+static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
+{
+ AVIContext *avi = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ uint32_t tag, tag1, handler;
+ int codec_type, stream_index, frame_period, bit_rate;
+ unsigned int size, nb_frames;
+ int i, n;
+ AVStream *st;
+ AVIStream *ast;
+ int xan_video = 0; /* hack to support Xan A/V */
+
+ avi->stream_index= -1;
+
+ if (get_riff(avi, pb) < 0)
return -1;
/* first list tag */
print_tag("list", tag1, 0);
#endif
if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
- avi->movi_end = url_ftell(pb) + size - 4;
+ avi->movi_list = url_ftell(pb) - 4;
+ if(size) avi->movi_end = avi->movi_list + size;
+ else avi->movi_end = url_fsize(pb);
#ifdef DEBUG
printf("movi end=%Lx\n", avi->movi_end);
#endif
goto end_of_header;
}
break;
+ case MKTAG('d', 'm', 'l', 'h'):
+ avi->is_odml = 1;
+ url_fskip(pb, size + (size & 1));
+ break;
case MKTAG('a', 'v', 'i', 'h'):
/* avi header */
/* using frame_period is bad idea */
frame_period = get_le32(pb);
bit_rate = get_le32(pb) * 8;
url_fskip(pb, 4 * 4);
- s->nb_streams = get_le32(pb);
- for(i=0;i<s->nb_streams;i++) {
- AVStream *st = av_mallocz(sizeof(AVStream));
+ n = get_le32(pb);
+ for(i=0;i<n;i++) {
+ AVIStream *ast;
+ st = av_new_stream(s, i);
if (!st)
goto fail;
- avcodec_get_context_defaults(&st->codec);
- s->streams[i] = st;
+ ast = av_mallocz(sizeof(AVIStream));
+ if (!ast)
+ goto fail;
+ st->priv_data = ast;
}
url_fskip(pb, size - 7 * 4);
break;
/* stream header */
stream_index++;
tag1 = get_le32(pb);
- switch(tag1) {
- case MKTAG('v', 'i', 'd', 's'):
- codec_type = CODEC_TYPE_VIDEO;
+ handler = get_le32(pb); /* codec tag */
+#ifdef DEBUG
+ print_tag("strh", tag1, -1);
+#endif
+ if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
+ /*
+ * After some consideration -- I don't think we
+ * have to support anything but DV in a type1 AVIs.
+ */
+ if (s->nb_streams != 1)
+ goto fail;
+
+ if (handler != MKTAG('d', 'v', 's', 'd') &&
+ handler != MKTAG('d', 'v', 'h', 'd') &&
+ handler != MKTAG('d', 'v', 's', 'l'))
+ goto fail;
+
+ ast = s->streams[0]->priv_data;
+ av_freep(&s->streams[0]->codec.extradata);
+ av_freep(&s->streams[0]);
+ s->nb_streams = 0;
+ avi->dv_demux = dv_init_demux(s);
+ if (!avi->dv_demux)
+ goto fail;
+ s->streams[0]->priv_data = ast;
+ url_fskip(pb, 3 * 4);
+ ast->scale = get_le32(pb);
+ ast->rate = get_le32(pb);
+ stream_index = s->nb_streams - 1;
+ url_fskip(pb, size - 7*4);
+ break;
+ }
- if (stream_index >= s->nb_streams) {
- url_fskip(pb, size - 4);
- break;
- }
+ if (stream_index >= s->nb_streams) {
+ url_fskip(pb, size - 8);
+ break;
+ }
+ st = s->streams[stream_index];
+ ast = st->priv_data;
+ st->codec.stream_codec_tag= handler;
- st = s->streams[stream_index];
+ get_le32(pb); /* flags */
+ get_le16(pb); /* priority */
+ get_le16(pb); /* language */
+ get_le32(pb); /* initial frame */
+ ast->scale = get_le32(pb);
+ ast->rate = get_le32(pb);
+ if(ast->scale && ast->rate){
+ }else if(frame_period){
+ ast->rate = 1000000;
+ ast->scale = frame_period;
+ }else{
+ ast->rate = 25;
+ ast->scale = 1;
+ }
+ av_set_pts_info(st, 64, ast->scale, ast->rate);
+
+ ast->start= get_le32(pb); /* start */
+ nb_frames = get_le32(pb);
- get_le32(pb); /* codec tag */
- get_le32(pb); /* flags */
- get_le16(pb); /* priority */
- get_le16(pb); /* language */
- get_le32(pb); /* XXX: initial frame ? */
- scale= get_le32(pb); /* scale */
- rate= get_le32(pb); /* rate */
-
- if(scale && rate)
- st->codec.frame_rate= (rate * (uint64_t)FRAME_RATE_BASE + scale/2) / scale;
- else if(frame_period)
- st->codec.frame_rate = (1000000LL * FRAME_RATE_BASE + frame_period/2) / frame_period;
- else
- st->codec.frame_rate = 25 * FRAME_RATE_BASE;
-
- url_fskip(pb, size - 7 * 4);
+ st->start_time = 0;
+ st->duration = nb_frames;
+ get_le32(pb); /* buffer size */
+ get_le32(pb); /* quality */
+ ast->sample_size = get_le32(pb); /* sample ssize */
+// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
+
+ switch(tag1) {
+ case MKTAG('v', 'i', 'd', 's'):
+ codec_type = CODEC_TYPE_VIDEO;
+
+ ast->sample_size = 0;
break;
case MKTAG('a', 'u', 'd', 's'):
codec_type = CODEC_TYPE_AUDIO;
- /* nothing really useful */
- url_fskip(pb, size - 4);
+ break;
+ case MKTAG('t', 'x', 't', 's'):
+ //FIXME
+ codec_type = CODEC_TYPE_DATA; //CODEC_TYPE_SUB ? FIXME
+ break;
+ case MKTAG('p', 'a', 'd', 's'):
+ codec_type = CODEC_TYPE_UNKNOWN;
+ stream_index--;
break;
default:
+ av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
goto fail;
}
+ url_fskip(pb, size - 12 * 4);
break;
case MKTAG('s', 't', 'r', 'f'):
/* stream header */
- if (stream_index >= s->nb_streams) {
+ if (stream_index >= s->nb_streams || avi->dv_demux) {
url_fskip(pb, size);
} else {
st = s->streams[stream_index];
get_le32(pb); /* ClrUsed */
get_le32(pb); /* ClrImportant */
+ if(size > 10*4 && size<(1<<30)){
st->codec.extradata_size= size - 10*4;
- st->codec.extradata= av_malloc(st->codec.extradata_size); //FIXME where should we free this?
+ st->codec.extradata= av_malloc(st->codec.extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
get_buffer(pb, st->codec.extradata, st->codec.extradata_size);
+ }
if(st->codec.extradata_size & 1) //FIXME check if the encoder really did this correctly
get_byte(pb);
+ /* Extract palette from extradata if bpp <= 8 */
+ /* This code assumes that extradata contains only palette */
+ /* This is true for all paletted codecs implemented in ffmpeg */
+ if (st->codec.extradata_size && (st->codec.bits_per_sample <= 8)) {
+ st->codec.palctrl = av_mallocz(sizeof(AVPaletteControl));
+#ifdef WORDS_BIGENDIAN
+ for (i = 0; i < FFMIN(st->codec.extradata_size, AVPALETTE_SIZE)/4; i++)
+ st->codec.palctrl->palette[i] = bswap_32(((uint32_t*)st->codec.extradata)[i]);
+#else
+ memcpy(st->codec.palctrl->palette, st->codec.extradata,
+ FFMIN(st->codec.extradata_size, AVPALETTE_SIZE));
+#endif
+ st->codec.palctrl->palette_changed = 1;
+ }
+
#ifdef DEBUG
print_tag("video", tag1, 0);
#endif
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_tag = tag1;
st->codec.codec_id = codec_get_id(codec_bmp_tags, tag1);
+ if (st->codec.codec_id == CODEC_ID_XAN_WC4)
+ xan_video = 1;
// url_fskip(pb, size - 5 * 4);
break;
case CODEC_TYPE_AUDIO:
- get_wav_header(pb, &st->codec, (size >= 18));
+ get_wav_header(pb, &st->codec, size);
if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
url_fskip(pb, 1);
+ /* special case time: To support Xan DPCM, hardcode
+ * the format if Xxan is the video codec */
+ st->need_parsing = 1;
+ /* force parsing as several audio frames can be in
+ one packet */
+ if (xan_video)
+ st->codec.codec_id = CODEC_ID_XAN_DPCM;
break;
default:
+ st->codec.codec_type = CODEC_TYPE_DATA;
+ st->codec.codec_id= CODEC_ID_NONE;
+ st->codec.codec_tag= 0;
url_fskip(pb, size);
break;
}
return -1;
}
+ assert(!avi->index_loaded);
+ avi_load_index(s);
+ avi->index_loaded = 1;
+
return 0;
}
{
AVIContext *avi = s->priv_data;
ByteIOContext *pb = &s->pb;
- int n, d[8], size, i;
+ int n, d[8], size;
+ offset_t i, sync;
+ void* dstr;
+
+ if (avi->dv_demux) {
+ size = dv_get_packet(avi->dv_demux, pkt);
+ if (size >= 0)
+ return size;
+ }
- memset(d, -1, sizeof(int)*8);
+ if(avi->non_interleaved){
+ int best_stream_index;
+ AVStream *best_st= NULL;
+ AVIStream *best_ast;
+ int64_t best_ts= INT64_MAX;
+ int i;
+
+ for(i=0; i<s->nb_streams; i++){
+ AVStream *st = s->streams[i];
+ AVIStream *ast = st->priv_data;
+ int64_t ts= ast->frame_offset;
+
+ if(ast->sample_size)
+ ts /= ast->sample_size;
+ ts= av_rescale(ts, AV_TIME_BASE * (int64_t)st->time_base.num, st->time_base.den);
+
+// av_log(NULL, AV_LOG_DEBUG, "%Ld %d/%d %Ld\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
+ if(ts < best_ts){
+ best_ts= ts;
+ best_st= st;
+ best_stream_index= i;
+ }
+ }
+ best_ast = best_st->priv_data;
+ best_ts= av_rescale(best_ts, best_st->time_base.den, AV_TIME_BASE * (int64_t)best_st->time_base.num); //FIXME a little ugly
+ if(best_ast->remaining)
+ i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
+ else
+ i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
- for(i=url_ftell(pb); (!url_feof(pb)) && i < avi->movi_end; i++){
+// av_log(NULL, AV_LOG_DEBUG, "%d\n", i);
+ if(i>=0){
+ int64_t pos= best_st->index_entries[i].pos;
+ pos += avi->movi_list + best_ast->packet_size - best_ast->remaining;
+ url_fseek(&s->pb, pos, SEEK_SET);
+// av_log(NULL, AV_LOG_DEBUG, "pos=%Ld\n", pos);
+
+ if(best_ast->remaining)
+ avi->stream_index= best_stream_index;
+ else
+ avi->stream_index= -1;
+ }
+ }
+
+resync:
+ if(avi->stream_index >= 0){
+ AVStream *st= s->streams[ avi->stream_index ];
+ AVIStream *ast= st->priv_data;
+ int size;
+
+ if(ast->sample_size == 0)
+ size= INT_MAX;
+ else if(ast->sample_size < 32)
+ size= 64*ast->sample_size;
+ else
+ size= ast->sample_size;
+
+ if(size > ast->remaining)
+ size= ast->remaining;
+ av_get_packet(pb, pkt, size);
+
+ if (avi->dv_demux) {
+ dstr = pkt->destruct;
+ size = dv_produce_packet(avi->dv_demux, pkt,
+ pkt->data, pkt->size);
+ pkt->destruct = dstr;
+ pkt->flags |= PKT_FLAG_KEY;
+ } else {
+ /* XXX: how to handle B frames in avi ? */
+ pkt->dts = ast->frame_offset;
+// pkt->dts += ast->start;
+ if(ast->sample_size)
+ pkt->dts /= ast->sample_size;
+//av_log(NULL, AV_LOG_DEBUG, "dts:%Ld offset:%d %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, n, size);
+ pkt->stream_index = avi->stream_index;
+
+ if (st->codec.codec_type == CODEC_TYPE_VIDEO) {
+ if(st->index_entries){
+ AVIndexEntry *e;
+ int index;
+
+ index= av_index_search_timestamp(st, pkt->dts, 0);
+ e= &st->index_entries[index];
+
+ if(index >= 0 && e->timestamp == ast->frame_offset){
+ if (e->flags & AVINDEX_KEYFRAME)
+ pkt->flags |= PKT_FLAG_KEY;
+ }
+ } else {
+ /* if no index, better to say that all frames
+ are key frames */
+ pkt->flags |= PKT_FLAG_KEY;
+ }
+ } else {
+ pkt->flags |= PKT_FLAG_KEY;
+ }
+ if(ast->sample_size)
+ ast->frame_offset += pkt->size;
+ else
+ ast->frame_offset++;
+ }
+ ast->remaining -= size;
+ if(!ast->remaining){
+ avi->stream_index= -1;
+ ast->packet_size= 0;
+ if (size & 1) {
+ get_byte(pb);
+ size++;
+ }
+ }
+
+ return size;
+ }
+
+ memset(d, -1, sizeof(int)*8);
+ for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
int j;
+ if (i >= avi->movi_end) {
+ if (avi->is_odml) {
+ url_fskip(pb, avi->riff_end - i);
+ avi->riff_end = avi->movi_end = url_fsize(pb);
+ } else
+ break;
+ }
+
for(j=0; j<7; j++)
d[j]= d[j+1];
d[7]= get_byte(pb);
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
- //parse ix##
- n= (d[2] - '0') * 10 + (d[3] - '0');
if( d[2] >= '0' && d[2] <= '9'
- && d[3] >= '0' && d[3] <= '9'
- && d[0] == 'i' && d[1] == 'x'
- && n < s->nb_streams
- && i + size <= avi->movi_end){
-
+ && d[3] >= '0' && d[3] <= '9'){
+ n= (d[2] - '0') * 10 + (d[3] - '0');
+ }else{
+ n= 100; //invalid stream id
+ }
+//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %lld %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
+ if(i + size > avi->movi_end || d[0]<0)
+ continue;
+
+ //parse ix##
+ if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
+ //parse JUNK
+ ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')){
url_fskip(pb, size);
+//av_log(NULL, AV_LOG_DEBUG, "SKIP\n");
+ goto resync;
+ }
+
+ if( d[0] >= '0' && d[0] <= '9'
+ && d[1] >= '0' && d[1] <= '9'){
+ n= (d[0] - '0') * 10 + (d[1] - '0');
+ }else{
+ n= 100; //invalid stream id
}
//parse ##dc/##wb
- n= (d[0] - '0') * 10 + (d[1] - '0');
- if( d[0] >= '0' && d[0] <= '9'
+ if(n < s->nb_streams){
+ AVStream *st;
+ AVIStream *ast;
+ st = s->streams[n];
+ ast = st->priv_data;
+
+ if( (st->discard >= AVDISCARD_DEFAULT && size==0)
+ /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & PKT_FLAG_KEY))*/ //FIXME needs a little reordering
+ || st->discard >= AVDISCARD_ALL){
+ if(ast->sample_size) ast->frame_offset += pkt->size;
+ else ast->frame_offset++;
+ url_fskip(pb, size);
+ goto resync;
+ }
+
+ if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
+ d[2]*256+d[3] == ast->prefix /*||
+ (d[2] == 'd' && d[3] == 'c') ||
+ (d[2] == 'w' && d[3] == 'b')*/) {
+
+//av_log(NULL, AV_LOG_DEBUG, "OK\n");
+ if(d[2]*256+d[3] == ast->prefix)
+ ast->prefix_count++;
+ else{
+ ast->prefix= d[2]*256+d[3];
+ ast->prefix_count= 0;
+ }
+
+ avi->stream_index= n;
+ ast->packet_size= size + 8;
+ ast->remaining= size;
+ goto resync;
+ }
+ }
+ /* palette changed chunk */
+ if ( d[0] >= '0' && d[0] <= '9'
&& d[1] >= '0' && d[1] <= '9'
- &&((d[2] == 'd' && d[3] == 'c') || (d[2] == 'w' && d[3] == 'b'))
- && n < s->nb_streams
- && i + size <= avi->movi_end){
+ && ((d[2] == 'p' && d[3] == 'c'))
+ && n < s->nb_streams && i + size <= avi->movi_end) {
+
+ AVStream *st;
+ int first, clr, flags, k, p;
+
+ st = s->streams[n];
+
+ first = get_byte(pb);
+ clr = get_byte(pb);
+ if(!clr) /* all 256 colors used */
+ clr = 256;
+ flags = get_le16(pb);
+ p = 4;
+ for (k = first; k < clr + first; k++) {
+ int r, g, b;
+ r = get_byte(pb);
+ g = get_byte(pb);
+ b = get_byte(pb);
+ get_byte(pb);
+ st->codec.palctrl->palette[k] = b + (g << 8) + (r << 16);
+ }
+ st->codec.palctrl->palette_changed = 1;
+ goto resync;
+ }
+
+ }
+
+ return -1;
+}
+
+/* XXX: we make the implicit supposition that the position are sorted
+ for each stream */
+static int avi_read_idx1(AVFormatContext *s, int size)
+{
+ AVIContext *avi = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ int nb_index_entries, i;
+ AVStream *st;
+ AVIStream *ast;
+ unsigned int index, tag, flags, pos, len;
+ unsigned last_pos= -1;
+
+ nb_index_entries = size / 16;
+ if (nb_index_entries <= 0)
+ return -1;
+
+ /* read the entries and sort them in each stream component */
+ for(i = 0; i < nb_index_entries; i++) {
+ tag = get_le32(pb);
+ flags = get_le32(pb);
+ pos = get_le32(pb);
+ len = get_le32(pb);
+#if defined(DEBUG_SEEK)
+ av_log(NULL, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
+ i, tag, flags, pos, len);
+#endif
+ if(i==0 && pos > avi->movi_list)
+ avi->movi_list= 0; //FIXME better check
+
+ index = ((tag & 0xff) - '0') * 10;
+ index += ((tag >> 8) & 0xff) - '0';
+ if (index >= s->nb_streams)
+ continue;
+ st = s->streams[index];
+ ast = st->priv_data;
- av_new_packet(pkt, size);
- pkt->stream_index = n;
+#if defined(DEBUG_SEEK)
+ av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%d\n", len, ast->cum_len);
+#endif
+ if(last_pos == pos)
+ avi->non_interleaved= 1;
+ else
+ av_add_index_entry(st, pos, ast->cum_len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
+ if(ast->sample_size)
+ ast->cum_len += len / ast->sample_size;
+ else
+ ast->cum_len ++;
+ last_pos= pos;
+ }
+ return 0;
+}
- get_buffer(pb, pkt->data, pkt->size);
+static int guess_ni_flag(AVFormatContext *s){
+ AVIContext *avi = s->priv_data;
+ int i;
+ int64_t last_start=0;
+ int64_t first_end= INT64_MAX;
+
+ for(i=0; i<s->nb_streams; i++){
+ AVStream *st = s->streams[i];
+ AVIStream *ast = st->priv_data;
+ int n= st->nb_index_entries;
- if (size & 1)
- get_byte(pb);
-
- return 0;
+ if(n <= 0)
+ continue;
+
+ if(st->index_entries[0].pos > last_start)
+ last_start= st->index_entries[0].pos;
+ if(st->index_entries[n-1].pos < first_end)
+ first_end= st->index_entries[n-1].pos;
+ }
+ return last_start > first_end;
+}
+
+static int avi_load_index(AVFormatContext *s)
+{
+ AVIContext *avi = s->priv_data;
+ ByteIOContext *pb = &s->pb;
+ uint32_t tag, size;
+ offset_t pos= url_ftell(pb);
+
+ url_fseek(pb, avi->movi_end, SEEK_SET);
+#ifdef DEBUG_SEEK
+ printf("movi_end=0x%llx\n", avi->movi_end);
+#endif
+ for(;;) {
+ if (url_feof(pb))
+ break;
+ tag = get_le32(pb);
+ size = get_le32(pb);
+#ifdef DEBUG_SEEK
+ printf("tag=%c%c%c%c size=0x%x\n",
+ tag & 0xff,
+ (tag >> 8) & 0xff,
+ (tag >> 16) & 0xff,
+ (tag >> 24) & 0xff,
+ size);
+#endif
+ switch(tag) {
+ case MKTAG('i', 'd', 'x', '1'):
+ if (avi_read_idx1(s, size) < 0)
+ goto skip;
+ else
+ goto the_end;
+ break;
+ default:
+ skip:
+ size += (size & 1);
+ url_fskip(pb, size);
+ break;
}
}
+ the_end:
+ avi->non_interleaved |= guess_ni_flag(s);
+ url_fseek(pb, pos, SEEK_SET);
+ return 0;
+}
+
+static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
+{
+ AVIContext *avi = s->priv_data;
+ AVStream *st;
+ int i, index;
+ int64_t pos;
+
+ if (!avi->index_loaded) {
+ /* we only load the index on demand */
+ avi_load_index(s);
+ avi->index_loaded = 1;
+ }
+ assert(stream_index>= 0);
+
+ st = s->streams[stream_index];
+ index= av_index_search_timestamp(st, timestamp, flags);
+ if(index<0)
+ return -1;
- return -1;
+ /* find the position */
+ pos = st->index_entries[index].pos;
+ timestamp = st->index_entries[index].timestamp;
+
+// av_log(NULL, AV_LOG_DEBUG, "XX %Ld %d %Ld\n", timestamp, index, st->index_entries[index].timestamp);
+
+ for(i = 0; i < s->nb_streams; i++) {
+ AVStream *st2 = s->streams[i];
+ AVIStream *ast2 = st2->priv_data;
+
+ ast2->packet_size=
+ ast2->remaining= 0;
+
+ if (st2->nb_index_entries <= 0)
+ continue;
+
+// assert(st2->codec.block_align);
+ assert(st2->time_base.den == ast2->rate);
+ assert(st2->time_base.num == ast2->scale);
+ index = av_index_search_timestamp(
+ st2,
+ av_rescale(timestamp, st2->time_base.den*(int64_t)st->time_base.num, st->time_base.den * (int64_t)st2->time_base.num),
+ flags | AVSEEK_FLAG_BACKWARD);
+ if(index<0)
+ index=0;
+
+ if(!avi->non_interleaved){
+ while(index>0 && st2->index_entries[index].pos > pos)
+ index--;
+ while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
+ index++;
+ }
+
+// av_log(NULL, AV_LOG_DEBUG, "%Ld %d %Ld\n", timestamp, index, st2->index_entries[index].timestamp);
+ /* extract the current frame number */
+ ast2->frame_offset = st2->index_entries[index].timestamp;
+ if(ast2->sample_size)
+ ast2->frame_offset *=ast2->sample_size;
+ }
+
+ if (avi->dv_demux)
+ dv_flush_audio_packets(avi->dv_demux);
+ /* do the seek */
+ pos += avi->movi_list;
+ url_fseek(&s->pb, pos, SEEK_SET);
+ avi->stream_index= -1;
+ return 0;
}
static int avi_read_close(AVFormatContext *s)
{
+ int i;
+ AVIContext *avi = s->priv_data;
+
+ for(i=0;i<s->nb_streams;i++) {
+ AVStream *st = s->streams[i];
+ AVIStream *ast = st->priv_data;
+ av_free(ast);
+ av_free(st->codec.extradata);
+ av_free(st->codec.palctrl);
+ }
+
+ if (avi->dv_demux)
+ av_free(avi->dv_demux);
+
return 0;
}
avi_read_header,
avi_read_packet,
avi_read_close,
+ avi_read_seek,
};
int avidec_init(void)
projects / ffmpeg / blobdiff