/* * AVI decoder. * Copyright (c) 2001 Fabrice Bellard. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #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; int scale; int rate; int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */ int64_t 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 riff_end; int64_t movi_end; offset_t movi_list; int index_loaded; int is_odml; int non_interleaved; int stream_index; DVDemuxContext* dv_demux; } AVIContext; static int avi_load_index(AVFormatContext *s); 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", str, tag & 0xff, (tag >> 8) & 0xff, (tag >> 16) & 0xff, (tag >> 24) & 0xff, size); } #endif static int get_riff(AVIContext *avi, ByteIOContext *pb) { uint32_t tag; /* check RIFF header */ tag = get_le32(pb); if (tag != MKTAG('R', 'I', 'F', 'F')) return -1; 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', ' ') && tag != MKTAG('A', 'V', 'I', 'X')) return -1; return 0; } static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ AVIContext *avi = s->priv_data; ByteIOContext *pb = &s->pb; int longs_pre_entry= get_le16(pb); int index_sub_type = get_byte(pb); int index_type = get_byte(pb); int entries_in_use = get_le32(pb); int chunk_id = get_le32(pb); int64_t base = get_le64(pb); int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0'); AVStream *st; AVIStream *ast; int i; int64_t last_pos= -1; // av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%Ld\n", // longs_pre_entry,index_type, entries_in_use, chunk_id, base); if(stream_id > s->nb_streams || stream_id < 0) return -1; st= s->streams[stream_id]; ast = st->priv_data; if(index_sub_type) return -1; get_le32(pb); if(index_type && longs_pre_entry != 2) return -1; if(index_type>1) return -1; for(i=0; i<entries_in_use; i++){ if(index_type){ int64_t pos= get_le32(pb) + base - 8; int len = get_le32(pb); int key= len >= 0; len &= 0x7FFFFFFF; //av_log(s, AV_LOG_ERROR, "pos:%Ld, len:%X\n", pos, len); if(last_pos == pos || pos == base - 8) avi->non_interleaved= 1; else av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0); if(ast->sample_size) ast->cum_len += len / ast->sample_size; else ast->cum_len ++; last_pos= pos; }else{ int64_t offset= get_le64(pb); int size = get_le32(pb); int duration = get_le32(pb); int64_t pos= url_ftell(pb); url_fseek(pb, offset+8, SEEK_SET); read_braindead_odml_indx(s, frame_num); frame_num += duration; url_fseek(pb, pos, SEEK_SET); } } return 0; } static void clean_index(AVFormatContext *s){ int i, j; for(i=0; i<s->nb_streams; i++){ AVStream *st = s->streams[i]; AVIStream *ast = st->priv_data; int n= st->nb_index_entries; int max= ast->sample_size; int64_t pos, size, ts; if(n != 1 || ast->sample_size==0) continue; while(max < 1024) max+=max; pos= st->index_entries[0].pos; size= st->index_entries[0].size; ts= st->index_entries[0].timestamp; for(j=0; j<size; j+=max){ av_add_index_entry(st, pos+j, ts + j/ast->sample_size, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); } } } 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 */ stream_index = -1; codec_type = -1; frame_period = 0; for(;;) { if (url_feof(pb)) goto fail; tag = get_le32(pb); size = get_le32(pb); #ifdef DEBUG print_tag("tag", tag, size); #endif switch(tag) { case MKTAG('L', 'I', 'S', 'T'): /* ignored, except when start of video packets */ tag1 = get_le32(pb); #ifdef DEBUG print_tag("list", tag1, 0); #endif if (tag1 == MKTAG('m', 'o', 'v', 'i')) { 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; get_le32(pb); avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX; url_fskip(pb, 2 * 4); n = get_le32(pb); for(i=0;i<n;i++) { AVIStream *ast; st = av_new_stream(s, i); if (!st) goto fail; ast = av_mallocz(sizeof(AVIStream)); if (!ast) goto fail; st->priv_data = ast; } url_fskip(pb, size - 7 * 4); break; case MKTAG('s', 't', 'r', 'h'): /* stream header */ stream_index++; tag1 = get_le32(pb); 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 - 8); /* ignore padding stream */ if (tag1 == MKTAG('p', 'a', 'd', 's')) stream_index--; break; } st = s->streams[stream_index]; ast = st->priv_data; st->codec->stream_codec_tag= handler; 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->cum_len=get_le32(pb); /* start */ nb_frames = get_le32(pb); 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; 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; } ast->frame_offset= ast->cum_len * FFMAX(ast->sample_size, 1); url_fskip(pb, size - 12 * 4); break; case MKTAG('s', 't', 'r', 'f'): /* stream header */ if (stream_index >= s->nb_streams || avi->dv_demux) { url_fskip(pb, size); } else { st = s->streams[stream_index]; switch(codec_type) { case CODEC_TYPE_VIDEO: get_le32(pb); /* size */ st->codec->width = get_le32(pb); st->codec->height = get_le32(pb); get_le16(pb); /* panes */ st->codec->bits_per_sample= get_le16(pb); /* depth */ tag1 = get_le32(pb); get_le32(pb); /* ImageSize */ get_le32(pb); /* XPelsPerMeter */ get_le32(pb); /* YPelsPerMeter */ 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 + 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; st->need_parsing = 2; //only parse headers dont do slower repacketization, this is needed to get the pict type which is needed for generating correct pts // url_fskip(pb, size - 5 * 4); break; case CODEC_TYPE_AUDIO: 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_DEBUG, "invalid sample size or block align detected\n"); 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; } } break; case MKTAG('i', 'n', 'd', 'x'): i= url_ftell(pb); read_braindead_odml_indx(s, 0); avi->index_loaded=1; url_fseek(pb, i+size, SEEK_SET); break; default: /* skip tag */ size += (size & 1); url_fskip(pb, size); break; } } end_of_header: /* check stream number */ if (stream_index != s->nb_streams - 1) { fail: for(i=0;i<s->nb_streams;i++) { av_freep(&s->streams[i]->codec->extradata); av_freep(&s->streams[i]); } return -1; } if(!avi->index_loaded) avi_load_index(s); avi->index_loaded = 1; avi->non_interleaved |= guess_ni_flag(s); if(avi->non_interleaved) clean_index(s); return 0; } static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; ByteIOContext *pb = &s->pb; 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; } if(avi->non_interleaved){ int best_stream_index = 0; 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); // av_log(NULL, 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=%Ld\n", pos); assert(best_ast->remaining <= best_ast->packet_size); avi->stream_index= best_stream_index; if(!best_ast->remaining) best_ast->packet_size= best_ast->remaining= best_st->index_entries[i].size; } } resync: if(avi->stream_index >= 0){ AVStream *st= s->streams[ avi->stream_index ]; AVIStream *ast= st->priv_data; int size; if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM 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:%Ld %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) { 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); if( d[2] >= '0' && d[2] <= '9' && 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 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] == '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 pos += avi->movi_list; index = ((tag & 0xff) - '0') * 10; index += ((tag >> 8) & 0xff) - '0'; if (index >= s->nb_streams) continue; st = s->streams[index]; ast = st->priv_data; #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, 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; } static int guess_ni_flag(AVFormatContext *s){ 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]; int n= st->nb_index_entries; 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: 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; /* 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 */ 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; } static int avi_probe(AVProbeData *p) { /* check file header */ if (p->buf_size <= 32) return 0; if (p->buf[0] == 'R' && p->buf[1] == 'I' && p->buf[2] == 'F' && p->buf[3] == 'F' && p->buf[8] == 'A' && p->buf[9] == 'V' && p->buf[10] == 'I' && p->buf[11] == ' ') return AVPROBE_SCORE_MAX; else return 0; } static AVInputFormat avi_iformat = { "avi", "avi format", sizeof(AVIContext), avi_probe, avi_read_header, avi_read_packet, avi_read_close, avi_read_seek, }; int avidec_init(void) { av_register_input_format(&avi_iformat); return 0; }