X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=libavformat%2Favidec.c;h=5be93949f775d7daa0072cb3b2505753b136fa2b;hb=4bae2251264d7818a3da50275fb7d3862b335900;hp=6997ebc3b84f97947e3c554c12fcdccc60a3558c;hpb=49fb20cb8a5da4250c978bd8cea8bd841dc0594f;p=ffmpeg diff --git a/libavformat/avidec.c b/libavformat/avidec.c index 6997ebc3b84..5be93949f77 100644 --- a/libavformat/avidec.c +++ b/libavformat/avidec.c @@ -19,6 +19,10 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +//#define DEBUG +//#define DEBUG_SEEK + +#include "libavutil/intreadwrite.h" #include "libavutil/bswap.h" #include "avformat.h" #include "avi.h" @@ -28,9 +32,6 @@ #undef NDEBUG #include -//#define DEBUG -//#define DEBUG_SEEK - typedef struct AVIStream { int64_t frame_offset; /* current frame (video) or byte (audio) counter (used to compute the pts) */ @@ -77,7 +78,7 @@ static int guess_ni_flag(AVFormatContext *s); #ifdef DEBUG static void print_tag(const char *str, unsigned int tag, int size) { - printf("%s: tag=%c%c%c%c size=0x%x\n", + dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n", str, tag & 0xff, (tag >> 8) & 0xff, (tag >> 16) & 0xff, @@ -86,8 +87,9 @@ static void print_tag(const char *str, unsigned int tag, int size) } #endif -static int get_riff(AVIContext *avi, ByteIOContext *pb) +static int get_riff(AVFormatContext *s, ByteIOContext *pb) { + AVIContext *avi = s->priv_data; char header[8]; int i; @@ -104,7 +106,7 @@ static int get_riff(AVIContext *avi, ByteIOContext *pb) return -1; if(header[7] == 0x19) - av_log(NULL, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); + av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); return 0; } @@ -163,10 +165,13 @@ static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ #ifdef DEBUG_SEEK av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len); #endif + if(url_feof(pb)) + return -1; + if(last_pos == pos || pos == base - 8) avi->non_interleaved= 1; - if(last_pos != pos) - av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, key ? AVINDEX_KEYFRAME : 0); + if(last_pos != pos && (len || !ast->sample_size)) + av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0); if(ast->sample_size) ast->cum_len += len; @@ -179,6 +184,10 @@ static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ offset = get_le64(pb); get_le32(pb); /* size */ duration = get_le32(pb); + + if(url_feof(pb)) + return -1; + pos = url_ftell(pb); url_fseek(pb, offset+8, SEEK_SET); @@ -213,7 +222,7 @@ static void clean_index(AVFormatContext *s){ ts= st->index_entries[0].timestamp; for(j=0; jsample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); + av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); } } } @@ -228,14 +237,14 @@ static int avi_read_tag(AVFormatContext *s, const char *key, unsigned int size) get_strz(pb, value, sizeof(value)); url_fseek(pb, i+size, SEEK_SET); - return av_metadata_set(&s->metadata, (const AVMetadataTag){key, value}); + return av_metadata_set(&s->metadata, key, value); } static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVIContext *avi = s->priv_data; ByteIOContext *pb = s->pb; - uint32_t tag, tag1, handler; + unsigned int tag, tag1, handler; int codec_type, stream_index, frame_period, bit_rate; unsigned int size, nb_frames; int i; @@ -243,15 +252,16 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) AVIStream *ast = NULL; int avih_width=0, avih_height=0; int amv_file_format=0; + uint64_t list_end = 0; avi->stream_index= -1; - if (get_riff(avi, pb) < 0) + if (get_riff(s, pb) < 0) return -1; avi->fsize = url_fsize(pb); if(avi->fsize<=0) - avi->fsize= avi->riff_end; + avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end; /* first list tag */ stream_index = -1; @@ -268,6 +278,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) switch(tag) { case MKTAG('L', 'I', 'S', 'T'): + list_end = url_ftell(pb) + size; /* Ignored, except at start of video packets. */ tag1 = get_le32(pb); #ifdef DEBUG @@ -277,9 +288,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) avi->movi_list = url_ftell(pb) - 4; if(size) avi->movi_end = avi->movi_list + size + (size & 1); else avi->movi_end = url_fsize(pb); -#ifdef DEBUG - printf("movi end=%"PRIx64"\n", avi->movi_end); -#endif + dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end); goto end_of_header; } break; @@ -406,7 +415,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) get_le32(pb); /* quality */ ast->sample_size = get_le32(pb); /* sample ssize */ ast->cum_len *= FFMAX(1, ast->sample_size); -// av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size); +// av_log(s, 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'): @@ -436,6 +445,9 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { url_fskip(pb, size); } else { + uint64_t cur_pos = url_ftell(pb); + if (cur_pos < list_end) + size = FFMIN(size, list_end - cur_pos); st = s->streams[stream_index]; switch(codec_type) { case CODEC_TYPE_VIDEO: @@ -449,7 +461,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) } get_le32(pb); /* size */ st->codec->width = get_le32(pb); - st->codec->height = get_le32(pb); + st->codec->height = (int32_t)get_le32(pb); get_le16(pb); /* panes */ st->codec->bits_per_coded_sample= get_le16(pb); /* depth */ tag1 = get_le32(pb); @@ -469,6 +481,10 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) if(size > 10*4 && size<(1<<30)){ st->codec->extradata_size= size - 10*4; st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + if (!st->codec->extradata) { + st->codec->extradata_size= 0; + return AVERROR(ENOMEM); + } get_buffer(pb, st->codec->extradata, st->codec->extradata_size); } @@ -480,7 +496,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) /* This is true for all paletted codecs implemented in FFmpeg. */ if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) { st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl)); -#ifdef WORDS_BIGENDIAN +#if HAVE_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 @@ -495,12 +511,21 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) #endif st->codec->codec_type = CODEC_TYPE_VIDEO; st->codec->codec_tag = tag1; - st->codec->codec_id = codec_get_id(codec_bmp_tags, tag1); + st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts. + + if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){ + st->codec->extradata_size+= 9; + st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); + if(st->codec->extradata) + memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9); + } + st->codec->height= FFABS(st->codec->height); + // url_fskip(pb, size - 5 * 4); break; case CODEC_TYPE_AUDIO: - get_wav_header(pb, st->codec, size); + ff_get_wav_header(pb, st->codec, size); if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){ av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align); ast->sample_size= st->codec->block_align; @@ -517,7 +542,7 @@ static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) st->need_parsing = AVSTREAM_PARSE_NONE; /* AVI files with Xan DPCM audio (wrongly) declare PCM * audio in the header but have Axan as stream_code_tag. */ - if (st->codec->stream_codec_tag == ff_get_fourcc("Axan")){ + if (st->codec->stream_codec_tag == AV_RL32("Axan")){ st->codec->codec_id = CODEC_ID_XAN_DPCM; st->codec->codec_tag = 0; } @@ -632,12 +657,13 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; ByteIOContext *pb = s->pb; - int n, d[8], size; + int n, d[8]; + unsigned int size; int64_t i, sync; void* dstr; if (CONFIG_DV_DEMUXER && avi->dv_demux) { - size = dv_get_packet(avi->dv_demux, pkt); + int size = dv_get_packet(avi->dv_demux, pkt); if (size >= 0) return size; } @@ -653,13 +679,19 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) AVStream *st = s->streams[i]; AVIStream *ast = st->priv_data; int64_t ts= ast->frame_offset; + int64_t last_ts; - 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); + if(!st->nb_index_entries) + continue; + + last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; + if(!ast->remaining && ts > last_ts) + continue; -// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset); - if(ts < best_ts && st->nb_index_entries){ + ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE}); + +// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\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; @@ -669,22 +701,21 @@ static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) return -1; 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 + best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base); 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); if(i>=0) - best_ast->frame_offset= best_st->index_entries[i].timestamp - * FFMAX(1, best_ast->sample_size); + best_ast->frame_offset= best_st->index_entries[i].timestamp; } -// av_log(NULL, AV_LOG_DEBUG, "%d\n", i); +// av_log(s, AV_LOG_DEBUG, "%d\n", i); if(i>=0){ int64_t pos= best_st->index_entries[i].pos; pos += best_ast->packet_size - best_ast->remaining; url_fseek(s->pb, pos + 8, SEEK_SET); -// av_log(NULL, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos); +// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos); assert(best_ast->remaining <= best_ast->packet_size); @@ -699,7 +730,7 @@ resync: if(avi->stream_index >= 0){ AVStream *st= s->streams[ avi->stream_index ]; AVIStream *ast= st->priv_data; - int size; + int size, err; if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM size= INT_MAX; @@ -711,14 +742,19 @@ resync: if(size > ast->remaining) size= ast->remaining; avi->last_pkt_pos= url_ftell(pb); - av_get_packet(pb, pkt, size); + err= av_get_packet(pb, pkt, size); + if(err<0) + return err; if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){ + void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE); + if(ptr){ ast->has_pal=0; pkt->size += 4*256; - pkt->data = av_realloc(pkt->data, pkt->size + FF_INPUT_BUFFER_PADDING_SIZE); - if(pkt->data) + pkt->data= ptr; memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256); + }else + av_log(s, AV_LOG_ERROR, "Failed to append palette\n"); } if (CONFIG_DV_DEMUXER && avi->dv_demux) { @@ -733,7 +769,7 @@ resync: // pkt->dts += ast->start; if(ast->sample_size) pkt->dts /= ast->sample_size; -//av_log(NULL, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %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, avi->stream_index, size); +//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %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, avi->stream_index, size); pkt->stream_index = avi->stream_index; if (st->codec->codec_type == CODEC_TYPE_VIDEO) { @@ -741,7 +777,7 @@ resync: int index; assert(st->index_entries); - index= av_index_search_timestamp(st, pkt->dts, 0); + index= av_index_search_timestamp(st, ast->frame_offset, 0); e= &st->index_entries[index]; if(index >= 0 && e->timestamp == ast->frame_offset){ @@ -776,8 +812,8 @@ resync: size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); n= get_stream_idx(d+2); -//av_log(NULL, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %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->fsize || d[0]<0) +//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); + if(i + (uint64_t)size > avi->fsize || d[0]<0) continue; //parse ix## @@ -786,7 +822,13 @@ resync: ||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K') ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ url_fskip(pb, size); -//av_log(NULL, AV_LOG_DEBUG, "SKIP\n"); +//av_log(s, AV_LOG_DEBUG, "SKIP\n"); + goto resync; + } + + //parse stray LIST + if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){ + url_fskip(pb, 4); goto resync; } @@ -795,6 +837,12 @@ resync: if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams) continue; + //detect ##ix chunk and skip + if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){ + url_fskip(pb, size); + goto resync; + } + //parse ##dc/##wb if(n < s->nb_streams){ AVStream *st; @@ -845,7 +893,7 @@ resync: (d[2] == 'd' && d[3] == 'c') || (d[2] == 'w' && d[3] == 'b')*/) { -//av_log(NULL, AV_LOG_DEBUG, "OK\n"); +//av_log(s, AV_LOG_DEBUG, "OK\n"); if(d[2]*256+d[3] == ast->prefix) ast->prefix_count++; else{ @@ -857,10 +905,10 @@ resync: ast->packet_size= size + 8; ast->remaining= size; - { + if(size || !ast->sample_size){ uint64_t pos= url_ftell(pb) - 8; if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){ - av_add_index_entry(st, pos, ast->frame_offset / FFMAX(1, ast->sample_size), size, 0, AVINDEX_KEYFRAME); + av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME); } } goto resync; @@ -868,7 +916,7 @@ resync: } } - return -1; + return AVERROR_EOF; } /* XXX: We make the implicit supposition that the positions are sorted @@ -894,7 +942,7 @@ static int avi_read_idx1(AVFormatContext *s, int size) 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/", + av_log(s, 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) @@ -909,12 +957,15 @@ static int avi_read_idx1(AVFormatContext *s, int size) ast = st->priv_data; #if defined(DEBUG_SEEK) - av_log(NULL, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); + av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len); #endif + if(url_feof(pb)) + return -1; + if(last_pos == pos) avi->non_interleaved= 1; - else - av_add_index_entry(st, pos, ast->cum_len / FFMAX(1, ast->sample_size), len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); + else if(len || !ast->sample_size) + av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); if(ast->sample_size) ast->cum_len += len; else @@ -928,19 +979,30 @@ static int guess_ni_flag(AVFormatContext *s){ int i; int64_t last_start=0; int64_t first_end= INT64_MAX; + int64_t oldpos= url_ftell(s->pb); for(i=0; inb_streams; i++){ AVStream *st = s->streams[i]; int n= st->nb_index_entries; + unsigned int size; if(n <= 0) continue; + if(n >= 2){ + int64_t pos= st->index_entries[0].pos; + url_fseek(s->pb, pos + 4, SEEK_SET); + size= get_le32(s->pb); + if(pos + size > st->index_entries[1].pos) + last_start= INT64_MAX; + } + 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; } + url_fseek(s->pb, oldpos, SEEK_SET); return last_start > first_end; } @@ -950,8 +1012,10 @@ static int avi_load_index(AVFormatContext *s) ByteIOContext *pb = s->pb; uint32_t tag, size; int64_t pos= url_ftell(pb); + int ret = -1; - url_fseek(pb, avi->movi_end, SEEK_SET); + if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0) + goto the_end; // maybe truncated file #ifdef DEBUG_SEEK printf("movi_end=0x%"PRIx64"\n", avi->movi_end); #endif @@ -972,19 +1036,20 @@ static int avi_load_index(AVFormatContext *s) case MKTAG('i', 'd', 'x', '1'): if (avi_read_idx1(s, size) < 0) goto skip; - else + ret = 0; goto the_end; break; default: skip: size += (size & 1); - url_fskip(pb, size); + if (url_fseek(pb, size, SEEK_CUR) < 0) + goto the_end; // something is wrong here break; } } the_end: url_fseek(pb, pos, SEEK_SET); - return 0; + return ret; } static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags) @@ -993,6 +1058,7 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp AVStream *st; int i, index; int64_t pos; + AVIStream *ast; if (!avi->index_loaded) { /* we only load the index on demand */ @@ -1002,15 +1068,16 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp assert(stream_index>= 0); st = s->streams[stream_index]; - index= av_index_search_timestamp(st, timestamp, flags); + ast= st->priv_data; + index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); if(index<0) return -1; /* find the position */ pos = st->index_entries[index].pos; - timestamp = st->index_entries[index].timestamp; + timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); -// av_log(NULL, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); +// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp); if (CONFIG_DV_DEMUXER && avi->dv_demux) { /* One and only one real stream for DV in AVI, and it has video */ @@ -1041,7 +1108,7 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*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), + av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), flags | AVSEEK_FLAG_BACKWARD); if(index<0) index=0; @@ -1053,11 +1120,9 @@ static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp index++; } -// av_log(NULL, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp); +// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\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; } /* do the seek */