/* * AVI demuxer * Copyright (c) 2001 Fabrice Bellard * * This file is part of FFmpeg. * * FFmpeg 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 2.1 of the License, or (at your option) any later version. * * FFmpeg 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 FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "libavutil/bswap.h" #include "libavutil/opt.h" #include "libavutil/dict.h" #include "libavutil/avstring.h" #include "avformat.h" #include "internal.h" #include "avi.h" #include "dv.h" #include "riff.h" #undef NDEBUG #include <assert.h> typedef struct AVIStream { int64_t frame_offset; /* current frame (video) or byte (audio) counter (used to compute the pts) */ int remaining; int packet_size; uint32_t scale; uint32_t 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; uint32_t pal[256]; int has_pal; int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer AVFormatContext *sub_ctx; AVPacket sub_pkt; uint8_t *sub_buffer; int64_t seek_pos; } AVIStream; typedef struct { const AVClass *class; int64_t riff_end; int64_t movi_end; int64_t fsize; int64_t movi_list; int64_t last_pkt_pos; int index_loaded; int is_odml; int non_interleaved; int stream_index; DVDemuxContext* dv_demux; int odml_depth; int use_odml; #define MAX_ODML_DEPTH 1000 int64_t dts_max; } AVIContext; static const AVOption options[] = { { "use_odml", "use odml index", offsetof(AVIContext, use_odml), AV_OPT_TYPE_INT, {.dbl = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM}, { NULL }, }; static const AVClass demuxer_class = { .class_name = "AVI demuxer", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, }; static const char avi_headers[][8] = { { 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' }, { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' }, { 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19}, { 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' }, { 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' }, { 0 } }; static const AVMetadataConv avi_metadata_conv[] = { { "strn", "title" }, { 0 }, }; static int avi_load_index(AVFormatContext *s); static int guess_ni_flag(AVFormatContext *s); #define print_tag(str, tag, size) \ av_dlog(NULL, "%s: tag=%c%c%c%c size=0x%x\n", \ str, tag & 0xff, \ (tag >> 8) & 0xff, \ (tag >> 16) & 0xff, \ (tag >> 24) & 0xff, \ size) static inline int get_duration(AVIStream *ast, int len){ if(ast->sample_size){ return len; }else if (ast->dshow_block_align){ return (len + ast->dshow_block_align - 1)/ast->dshow_block_align; }else return 1; } static int get_riff(AVFormatContext *s, AVIOContext *pb) { AVIContext *avi = s->priv_data; char header[8]; int i; /* check RIFF header */ avio_read(pb, header, 4); avi->riff_end = avio_rl32(pb); /* RIFF chunk size */ avi->riff_end += avio_tell(pb); /* RIFF chunk end */ avio_read(pb, header+4, 4); for(i=0; avi_headers[i][0]; i++) if(!memcmp(header, avi_headers[i], 8)) break; if(!avi_headers[i][0]) return -1; if(header[7] == 0x19) av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n"); return 0; } static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){ AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int longs_pre_entry= avio_rl16(pb); int index_sub_type = avio_r8(pb); int index_type = avio_r8(pb); int entries_in_use = avio_rl32(pb); int chunk_id = avio_rl32(pb); int64_t base = avio_rl64(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; int64_t filesize= avi->fsize; av_dlog(s, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\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; avio_rl32(pb); if(index_type && longs_pre_entry != 2) return -1; if(index_type>1) return -1; if(filesize > 0 && base >= filesize){ av_log(s, AV_LOG_ERROR, "ODML index invalid\n"); if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF) base &= 0xFFFFFFFF; else return -1; } for(i=0; i<entries_in_use; i++){ if(index_type){ int64_t pos= avio_rl32(pb) + base - 8; int len = avio_rl32(pb); int key= len >= 0; len &= 0x7FFFFFFF; #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 && (len || !ast->sample_size)) av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0); ast->cum_len += get_duration(ast, len); last_pos= pos; }else{ int64_t offset, pos; int duration; offset = avio_rl64(pb); avio_rl32(pb); /* size */ duration = avio_rl32(pb); if(url_feof(pb)) return -1; pos = avio_tell(pb); if(avi->odml_depth > MAX_ODML_DEPTH){ av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); return -1; } if(avio_seek(pb, offset+8, SEEK_SET) < 0) return -1; avi->odml_depth++; read_braindead_odml_indx(s, frame_num); avi->odml_depth--; frame_num += duration; if(avio_seek(pb, pos, SEEK_SET) < 0) { av_log(s, AV_LOG_ERROR, "Failed to restore position after reading index"); return -1; } } } avi->index_loaded=2; return 0; } static void clean_index(AVFormatContext *s){ int i; int64_t 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, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME); } } } static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size) { AVIOContext *pb = s->pb; char key[5] = {0}, *value; size += (size & 1); if (size == UINT_MAX) return -1; value = av_malloc(size+1); if (!value) return -1; avio_read(pb, value, size); value[size]=0; AV_WL32(key, tag); return av_dict_set(st ? &st->metadata : &s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); } static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; static void avi_metadata_creation_time(AVDictionary **metadata, char *date) { char month[4], time[9], buffer[64]; int i, day, year; /* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */ if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d", month, &day, time, &year) == 4) { for (i=0; i<12; i++) if (!av_strcasecmp(month, months[i])) { snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s", year, i+1, day, time); av_dict_set(metadata, "creation_time", buffer, 0); } } else if (date[4] == '/' && date[7] == '/') { date[4] = date[7] = '-'; av_dict_set(metadata, "creation_time", date, 0); } } static void avi_read_nikon(AVFormatContext *s, uint64_t end) { while (avio_tell(s->pb) < end) { uint32_t tag = avio_rl32(s->pb); uint32_t size = avio_rl32(s->pb); switch (tag) { case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */ uint64_t tag_end = avio_tell(s->pb) + size; while (avio_tell(s->pb) < tag_end) { uint16_t tag = avio_rl16(s->pb); uint16_t size = avio_rl16(s->pb); const char *name = NULL; char buffer[64] = {0}; size -= avio_read(s->pb, buffer, FFMIN(size, sizeof(buffer)-1)); switch (tag) { case 0x03: name = "maker"; break; case 0x04: name = "model"; break; case 0x13: name = "creation_time"; if (buffer[4] == ':' && buffer[7] == ':') buffer[4] = buffer[7] = '-'; break; } if (name) av_dict_set(&s->metadata, name, buffer, 0); avio_skip(s->pb, size); } break; } default: avio_skip(s->pb, size); break; } } } static int avi_read_header(AVFormatContext *s) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; unsigned int tag, tag1, handler; int codec_type, stream_index, frame_period; unsigned int size; int i; AVStream *st; AVIStream *ast = NULL; int avih_width=0, avih_height=0; int amv_file_format=0; uint64_t list_end = 0; int ret; avi->stream_index= -1; if (get_riff(s, pb) < 0) return -1; av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml); avi->fsize = avio_size(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; codec_type = -1; frame_period = 0; for(;;) { if (url_feof(pb)) goto fail; tag = avio_rl32(pb); size = avio_rl32(pb); print_tag("tag", tag, size); switch(tag) { case MKTAG('L', 'I', 'S', 'T'): list_end = avio_tell(pb) + size; /* Ignored, except at start of video packets. */ tag1 = avio_rl32(pb); print_tag("list", tag1, 0); if (tag1 == MKTAG('m', 'o', 'v', 'i')) { avi->movi_list = avio_tell(pb) - 4; if(size) avi->movi_end = avi->movi_list + size + (size & 1); else avi->movi_end = avi->fsize; av_dlog(NULL, "movi end=%"PRIx64"\n", avi->movi_end); goto end_of_header; } else if (tag1 == MKTAG('I', 'N', 'F', 'O')) ff_read_riff_info(s, size - 4); else if (tag1 == MKTAG('n', 'c', 'd', 't')) avi_read_nikon(s, list_end); break; case MKTAG('I', 'D', 'I', 'T'): { unsigned char date[64] = {0}; size += (size & 1); size -= avio_read(pb, date, FFMIN(size, sizeof(date)-1)); avio_skip(pb, size); avi_metadata_creation_time(&s->metadata, date); break; } case MKTAG('d', 'm', 'l', 'h'): avi->is_odml = 1; avio_skip(pb, size + (size & 1)); break; case MKTAG('a', 'm', 'v', 'h'): amv_file_format=1; case MKTAG('a', 'v', 'i', 'h'): /* AVI header */ /* using frame_period is bad idea */ frame_period = avio_rl32(pb); avio_rl32(pb); /* max. bytes per second */ avio_rl32(pb); avi->non_interleaved |= avio_rl32(pb) & AVIF_MUSTUSEINDEX; avio_skip(pb, 2 * 4); avio_rl32(pb); avio_rl32(pb); avih_width=avio_rl32(pb); avih_height=avio_rl32(pb); avio_skip(pb, size - 10 * 4); break; case MKTAG('s', 't', 'r', 'h'): /* stream header */ tag1 = avio_rl32(pb); handler = avio_rl32(pb); /* codec tag */ if(tag1 == MKTAG('p', 'a', 'd', 's')){ avio_skip(pb, size - 8); break; }else{ stream_index++; st = avformat_new_stream(s, NULL); if (!st) goto fail; st->id = stream_index; ast = av_mallocz(sizeof(AVIStream)); if (!ast) goto fail; st->priv_data = ast; } if(amv_file_format) tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s'); print_tag("strh", tag1, -1); if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){ int64_t dv_dur; /* * After some consideration -- I don't think we * have to support anything but DV in 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]->codec); av_freep(&s->streams[0]); s->nb_streams = 0; if (CONFIG_DV_DEMUXER) { avi->dv_demux = avpriv_dv_init_demux(s); if (!avi->dv_demux) goto fail; } s->streams[0]->priv_data = ast; avio_skip(pb, 3 * 4); ast->scale = avio_rl32(pb); ast->rate = avio_rl32(pb); avio_skip(pb, 4); /* start time */ dv_dur = avio_rl32(pb); if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) { dv_dur *= AV_TIME_BASE; s->duration = av_rescale(dv_dur, ast->scale, ast->rate); } /* * else, leave duration alone; timing estimation in utils.c * will make a guess based on bitrate. */ stream_index = s->nb_streams - 1; avio_skip(pb, size - 9*4); break; } assert(stream_index < s->nb_streams); st->codec->stream_codec_tag= handler; avio_rl32(pb); /* flags */ avio_rl16(pb); /* priority */ avio_rl16(pb); /* language */ avio_rl32(pb); /* initial frame */ ast->scale = avio_rl32(pb); ast->rate = avio_rl32(pb); if(!(ast->scale && ast->rate)){ av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate); if(frame_period){ ast->rate = 1000000; ast->scale = frame_period; }else{ ast->rate = 25; ast->scale = 1; } } avpriv_set_pts_info(st, 64, ast->scale, ast->rate); ast->cum_len=avio_rl32(pb); /* start */ st->nb_frames = avio_rl32(pb); st->start_time = 0; avio_rl32(pb); /* buffer size */ avio_rl32(pb); /* quality */ if (ast->cum_len*ast->scale/ast->rate > 3600) { av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); return AVERROR_INVALIDDATA; } ast->sample_size = avio_rl32(pb); /* sample ssize */ ast->cum_len *= FFMAX(1, 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'): codec_type = AVMEDIA_TYPE_VIDEO; ast->sample_size = 0; break; case MKTAG('a', 'u', 'd', 's'): codec_type = AVMEDIA_TYPE_AUDIO; break; case MKTAG('t', 'x', 't', 's'): codec_type = AVMEDIA_TYPE_SUBTITLE; break; case MKTAG('d', 'a', 't', 's'): codec_type = AVMEDIA_TYPE_DATA; break; default: av_log(s, AV_LOG_INFO, "unknown stream type %X\n", tag1); } if(ast->sample_size == 0) st->duration = st->nb_frames; ast->frame_offset= ast->cum_len; avio_skip(pb, size - 12 * 4); break; case MKTAG('s', 't', 'r', 'f'): /* stream header */ if (!size) break; if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) { avio_skip(pb, size); } else { uint64_t cur_pos = avio_tell(pb); unsigned esize; if (cur_pos < list_end) size = FFMIN(size, list_end - cur_pos); st = s->streams[stream_index]; switch(codec_type) { case AVMEDIA_TYPE_VIDEO: if(amv_file_format){ st->codec->width=avih_width; st->codec->height=avih_height; st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_id = CODEC_ID_AMV; avio_skip(pb, size); break; } tag1 = ff_get_bmp_header(pb, st, &esize); if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) { st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codec->codec_tag = tag1; st->codec->codec_id = CODEC_ID_XSUB; break; } if(size > 10*4 && size<(1<<30) && size < avi->fsize){ if(esize == size-1 && (esize&1)) st->codec->extradata_size= esize - 10*4; else 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); } avio_read(pb, st->codec->extradata, st->codec->extradata_size); } if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly avio_r8(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_coded_sample <= 8)) { int pal_size = (1 << st->codec->bits_per_coded_sample) << 2; const uint8_t *pal_src; pal_size = FFMIN(pal_size, st->codec->extradata_size); pal_src = st->codec->extradata + st->codec->extradata_size - pal_size; for (i = 0; i < pal_size/4; i++) ast->pal[i] = 0xFF<<24 | AV_RL32(pal_src+4*i); ast->has_pal = 1; } print_tag("video", tag1, 0); st->codec->codec_type = AVMEDIA_TYPE_VIDEO; st->codec->codec_tag = 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. // Support "Resolution 1:1" for Avid AVI Codec if(tag1 == MKTAG('A', 'V', 'R', 'n') && st->codec->extradata_size >= 31 && !memcmp(&st->codec->extradata[28], "1:1", 3)) st->codec->codec_id = CODEC_ID_RAWVIDEO; 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_f(st->codec->extradata, 1, 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); // avio_skip(pb, size - 5 * 4); break; case AVMEDIA_TYPE_AUDIO: ret = ff_get_wav_header(pb, st->codec, size); if (ret < 0) return ret; ast->dshow_block_align= st->codec->block_align; 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; } if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ avio_skip(pb, 1); /* Force parsing as several audio frames can be in * one packet and timestamps refer to packet start. */ st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS; /* ADTS header is in extradata, AAC without header must be * stored as exact frames. Parser not needed and it will * fail. */ if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size) 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 == AV_RL32("Axan")){ st->codec->codec_id = CODEC_ID_XAN_DPCM; st->codec->codec_tag = 0; ast->dshow_block_align = 0; } if (amv_file_format){ st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV; ast->dshow_block_align = 0; } break; case AVMEDIA_TYPE_SUBTITLE: st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; st->request_probe= 1; break; default: st->codec->codec_type = AVMEDIA_TYPE_DATA; st->codec->codec_id= CODEC_ID_NONE; st->codec->codec_tag= 0; avio_skip(pb, size); break; } } break; case MKTAG('s', 't', 'r', 'd'): if (stream_index >= (unsigned)s->nb_streams || s->streams[stream_index]->codec->extradata_size) { avio_skip(pb, size); } else { uint64_t cur_pos = avio_tell(pb); if (cur_pos < list_end) size = FFMIN(size, list_end - cur_pos); st = s->streams[stream_index]; if(size<(1<<30)){ st->codec->extradata_size= size; st->codec->extradata= av_mallocz(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE); if (!st->codec->extradata) { st->codec->extradata_size= 0; return AVERROR(ENOMEM); } avio_read(pb, st->codec->extradata, st->codec->extradata_size); } if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly avio_r8(pb); } break; case MKTAG('i', 'n', 'd', 'x'): i= avio_tell(pb); if(pb->seekable && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml && read_braindead_odml_indx(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE)) goto fail; avio_seek(pb, i+size, SEEK_SET); break; case MKTAG('v', 'p', 'r', 'p'): if(stream_index < (unsigned)s->nb_streams && size > 9*4){ AVRational active, active_aspect; st = s->streams[stream_index]; avio_rl32(pb); avio_rl32(pb); avio_rl32(pb); avio_rl32(pb); avio_rl32(pb); active_aspect.den= avio_rl16(pb); active_aspect.num= avio_rl16(pb); active.num = avio_rl32(pb); active.den = avio_rl32(pb); avio_rl32(pb); //nbFieldsPerFrame if(active_aspect.num && active_aspect.den && active.num && active.den){ st->sample_aspect_ratio= av_div_q(active_aspect, active); //av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den); } size -= 9*4; } avio_skip(pb, size); break; case MKTAG('s', 't', 'r', 'n'): if(s->nb_streams){ avi_read_tag(s, s->streams[s->nb_streams-1], tag, size); break; } default: if(size > 1000000){ av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " "I will ignore it and try to continue anyway.\n"); if (s->error_recognition & AV_EF_EXPLODE) goto fail; avi->movi_list = avio_tell(pb) - 4; avi->movi_end = avi->fsize; goto end_of_header; } /* skip tag */ size += (size & 1); avio_skip(pb, size); break; } } end_of_header: /* check stream number */ if (stream_index != s->nb_streams - 1) { fail: return -1; } if(!avi->index_loaded && pb->seekable) avi_load_index(s); avi->index_loaded |= 1; avi->non_interleaved |= guess_ni_flag(s) | (s->flags & AVFMT_FLAG_SORT_DTS); for(i=0; i<s->nb_streams; i++){ AVStream *st = s->streams[i]; if(st->nb_index_entries) break; } // DV-in-AVI cannot be non-interleaved, if set this must be // a mis-detection. if(avi->dv_demux) avi->non_interleaved=0; if(i==s->nb_streams && avi->non_interleaved) { av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n"); avi->non_interleaved=0; } if(avi->non_interleaved) { av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); clean_index(s); } ff_metadata_conv_ctx(s, NULL, avi_metadata_conv); ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); return 0; } static int read_gab2_sub(AVStream *st, AVPacket *pkt) { if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) { uint8_t desc[256]; int score = AVPROBE_SCORE_MAX / 2, ret; AVIStream *ast = st->priv_data; AVInputFormat *sub_demuxer; AVRational time_base; AVIOContext *pb = avio_alloc_context( pkt->data + 7, pkt->size - 7, 0, NULL, NULL, NULL, NULL); AVProbeData pd; unsigned int desc_len = avio_rl32(pb); if (desc_len > pb->buf_end - pb->buf_ptr) goto error; ret = avio_get_str16le(pb, desc_len, desc, sizeof(desc)); avio_skip(pb, desc_len - ret); if (*desc) av_dict_set(&st->metadata, "title", desc, 0); avio_rl16(pb); /* flags? */ avio_rl32(pb); /* data size */ pd = (AVProbeData) { .buf = pb->buf_ptr, .buf_size = pb->buf_end - pb->buf_ptr }; if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score))) goto error; if (!(ast->sub_ctx = avformat_alloc_context())) goto error; ast->sub_ctx->pb = pb; if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { ff_read_packet(ast->sub_ctx, &ast->sub_pkt); *st->codec = *ast->sub_ctx->streams[0]->codec; ast->sub_ctx->streams[0]->codec->extradata = NULL; time_base = ast->sub_ctx->streams[0]->time_base; avpriv_set_pts_info(st, 64, time_base.num, time_base.den); } ast->sub_buffer = pkt->data; memset(pkt, 0, sizeof(*pkt)); return 1; error: av_freep(&pb); } return 0; } static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st, AVPacket *pkt) { AVIStream *ast, *next_ast = next_st->priv_data; int64_t ts, next_ts, ts_min = INT64_MAX; AVStream *st, *sub_st = NULL; int i; next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base, AV_TIME_BASE_Q); for (i=0; i<s->nb_streams; i++) { st = s->streams[i]; ast = st->priv_data; if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) { ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q); if (ts <= next_ts && ts < ts_min) { ts_min = ts; sub_st = st; } } } if (sub_st) { ast = sub_st->priv_data; *pkt = ast->sub_pkt; pkt->stream_index = sub_st->index; if (ff_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0) ast->sub_pkt.data = NULL; } return sub_st; } static int get_stream_idx(int *d){ if( d[0] >= '0' && d[0] <= '9' && d[1] >= '0' && d[1] <= '9'){ return (d[0] - '0') * 10 + (d[1] - '0'); }else{ return 100; //invalid stream ID } } /** * * @param exit_early set to 1 to just gather packet position without making the changes needed to actually read & return the packet */ static int avi_sync(AVFormatContext *s, int exit_early) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int n; unsigned int d[8]; unsigned int size; int64_t i, sync; start_sync: memset(d, -1, sizeof(d)); for(i=sync=avio_tell(pb); !url_feof(pb); i++) { int j; for(j=0; j<7; j++) d[j]= d[j+1]; d[7]= avio_r8(pb); size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24); n= get_stream_idx(d+2); //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] > 127) 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') ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ avio_skip(pb, size); //av_log(s, AV_LOG_DEBUG, "SKIP\n"); goto start_sync; } //parse stray LIST if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){ avio_skip(pb, 4); goto start_sync; } n= get_stream_idx(d); 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){ avio_skip(pb, size); goto start_sync; } //parse ##dc/##wb if(n < s->nb_streams){ AVStream *st; AVIStream *ast; st = s->streams[n]; ast = st->priv_data; if (!ast) { av_log(s, AV_LOG_WARNING, "Skiping foreign stream %d packet\n", n); continue; } if(s->nb_streams>=2){ AVStream *st1 = s->streams[1]; AVIStream *ast1= st1->priv_data; //workaround for broken small-file-bug402.avi if( d[2] == 'w' && d[3] == 'b' && n==0 && st ->codec->codec_type == AVMEDIA_TYPE_VIDEO && st1->codec->codec_type == AVMEDIA_TYPE_AUDIO && ast->prefix == 'd'*256+'c' && (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count) ){ n=1; st = st1; ast = ast1; av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n"); } } if( (st->discard >= AVDISCARD_DEFAULT && size==0) /*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering || st->discard >= AVDISCARD_ALL){ if (!exit_early) { ast->frame_offset += get_duration(ast, size); } avio_skip(pb, size); goto start_sync; } if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { int k = avio_r8(pb); int last = (k + avio_r8(pb) - 1) & 0xFF; avio_rl16(pb); //flags for (; k <= last; k++) ast->pal[k] = 0xFF<<24 | avio_rb32(pb)>>8;// b + (g << 8) + (r << 16); ast->has_pal= 1; goto start_sync; } else 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')*/) { if (exit_early) return 0; //av_log(s, 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; if(size || !ast->sample_size){ uint64_t pos= avio_tell(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, size, 0, AVINDEX_KEYFRAME); } } return 0; } } } if(pb->error) return pb->error; return AVERROR_EOF; } static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int err; void* dstr; if (CONFIG_DV_DEMUXER && avi->dv_demux) { int size = avpriv_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; int64_t last_ts; if(!st->nb_index_entries) continue; last_ts = st->index_entries[st->nb_index_entries - 1].timestamp; if(!ast->remaining && ts > last_ts) continue; 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; } } if(!best_st) return AVERROR_EOF; best_ast = best_st->priv_data; best_ts = best_ast->frame_offset; 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; } // 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; if(avio_seek(s->pb, pos + 8, SEEK_SET) < 0) return AVERROR_EOF; // av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\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; } else return AVERROR_EOF; } resync: if(avi->stream_index >= 0){ AVStream *st= s->streams[ avi->stream_index ]; AVIStream *ast= st->priv_data; int size, err; if(get_subtitle_pkt(s, st, pkt)) return 0; if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM size= INT_MAX; else if(ast->sample_size < 32) // arbitrary multiplier to avoid tiny packets for raw PCM data size= 1024*ast->sample_size; else size= ast->sample_size; if(size > ast->remaining) size= ast->remaining; avi->last_pkt_pos= avio_tell(pb); err= av_get_packet(pb, pkt, size); if(err<0) return err; size = err; if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){ uint8_t *pal; pal = av_packet_new_side_data(pkt, AV_PKT_DATA_PALETTE, AVPALETTE_SIZE); if(!pal){ av_log(s, AV_LOG_ERROR, "Failed to allocate data for palette\n"); }else{ memcpy(pal, ast->pal, AVPALETTE_SIZE); ast->has_pal = 0; } } if (CONFIG_DV_DEMUXER && avi->dv_demux) { dstr = pkt->destruct; size = avpriv_dv_produce_packet(avi->dv_demux, pkt, pkt->data, pkt->size, pkt->pos); pkt->destruct = dstr; pkt->flags |= AV_PKT_FLAG_KEY; if (size < 0) av_free_packet(pkt); } else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE && !st->codec->codec_tag && read_gab2_sub(st, pkt)) { ast->frame_offset++; avi->stream_index = -1; ast->remaining = 0; goto resync; } 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(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 == AVMEDIA_TYPE_VIDEO) { AVIndexEntry *e; int index; assert(st->index_entries); index= av_index_search_timestamp(st, ast->frame_offset, 0); e= &st->index_entries[index]; if(index >= 0 && e->timestamp == ast->frame_offset){ if (index == st->nb_index_entries-1){ int key=1; int i; uint32_t state=-1; for(i=0; i<FFMIN(size,256); i++){ if(st->codec->codec_id == CODEC_ID_MPEG4){ if(state == 0x1B6){ key= !(pkt->data[i]&0xC0); break; } }else break; state= (state<<8) + pkt->data[i]; } if(!key) e->flags &= ~AVINDEX_KEYFRAME; } if (e->flags & AVINDEX_KEYFRAME) pkt->flags |= AV_PKT_FLAG_KEY; } } else { pkt->flags |= AV_PKT_FLAG_KEY; } ast->frame_offset += get_duration(ast, pkt->size); } ast->remaining -= size; if(!ast->remaining){ avi->stream_index= -1; ast->packet_size= 0; } if(!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos){ av_free_packet(pkt); goto resync; } ast->seek_pos= 0; if(!avi->non_interleaved && st->nb_index_entries>1 && avi->index_loaded>1){ int64_t dts= av_rescale_q(pkt->dts, st->time_base, AV_TIME_BASE_Q); if(avi->dts_max - dts > 2*AV_TIME_BASE){ avi->non_interleaved= 1; av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); }else if(avi->dts_max < dts) avi->dts_max = dts; } return size; } if ((err = avi_sync(s, 0)) < 0) return err; goto resync; } /* XXX: We make the implicit supposition that the positions are sorted for each stream. */ static int avi_read_idx1(AVFormatContext *s, int size) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int nb_index_entries, i; AVStream *st; AVIStream *ast; unsigned int index, tag, flags, pos, len, first_packet = 1; unsigned last_pos= -1; unsigned last_idx= -1; int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; nb_index_entries = size / 16; if (nb_index_entries <= 0) return -1; idx1_pos = avio_tell(pb); avio_seek(pb, avi->movi_list+4, SEEK_SET); if (avi_sync(s, 1) == 0) { first_packet_pos = avio_tell(pb) - 8; } avi->stream_index = -1; avio_seek(pb, idx1_pos, SEEK_SET); /* Read the entries and sort them in each stream component. */ for(i = 0; i < nb_index_entries; i++) { if(url_feof(pb)) return -1; tag = avio_rl32(pb); flags = avio_rl32(pb); pos = avio_rl32(pb); len = avio_rl32(pb); av_dlog(s, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/", i, tag, flags, pos, len); 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(first_packet && first_packet_pos && len) { data_offset = first_packet_pos - pos; first_packet = 0; } pos += data_offset; av_dlog(s, "%d cum_len=%"PRId64"\n", len, ast->cum_len); // even if we have only a single stream, we should // switch to non-interleaved to get correct timestamps if(last_pos == pos) avi->non_interleaved= 1; if(last_idx != pos && len) { av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0); last_idx= pos; } ast->cum_len += get_duration(ast, 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; int64_t oldpos= avio_tell(s->pb); int *idx; int64_t min_pos, pos; for(i=0; i<s->nb_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; avio_seek(s->pb, pos + 4, SEEK_SET); size= avio_rl32(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; } avio_seek(s->pb, oldpos, SEEK_SET); if (last_start > first_end) return 1; idx= av_mallocz(sizeof(*idx) * s->nb_streams); for (min_pos=pos=0; min_pos!=INT64_MAX; pos= min_pos+1) { int64_t max_dts = INT64_MIN/2, min_dts= INT64_MAX/2; min_pos = INT64_MAX; for (i=0; i<s->nb_streams; i++) { AVStream *st = s->streams[i]; int n= st->nb_index_entries; while (idx[i]<n && st->index_entries[idx[i]].pos < pos) idx[i]++; if (idx[i] < n) { min_dts = FFMIN(min_dts, av_rescale_q(st->index_entries[idx[i]].timestamp, st->time_base, AV_TIME_BASE_Q)); min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos); } if (idx[i]) max_dts = FFMAX(max_dts, av_rescale_q(st->index_entries[idx[i]-1].timestamp, st->time_base, AV_TIME_BASE_Q)); } if(max_dts - min_dts > 2*AV_TIME_BASE) { av_free(idx); return 1; } } av_free(idx); return 0; } static int avi_load_index(AVFormatContext *s) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; uint32_t tag, size; int64_t pos= avio_tell(pb); int ret = -1; if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) goto the_end; // maybe truncated file av_dlog(s, "movi_end=0x%"PRIx64"\n", avi->movi_end); for(;;) { if (url_feof(pb)) break; tag = avio_rl32(pb); size = avio_rl32(pb); av_dlog(s, "tag=%c%c%c%c size=0x%x\n", tag & 0xff, (tag >> 8) & 0xff, (tag >> 16) & 0xff, (tag >> 24) & 0xff, size); if (tag == MKTAG('i', 'd', 'x', '1') && avi_read_idx1(s, size) >= 0) { avi->index_loaded=2; ret = 0; break; } size += (size & 1); if (avio_skip(pb, size) < 0) break; // something is wrong here } the_end: avio_seek(pb, pos, SEEK_SET); return ret; } static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp) { AVIStream *ast2 = st2->priv_data; int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base); av_free_packet(&ast2->sub_pkt); if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 || avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0) ff_read_packet(ast2->sub_ctx, &ast2->sub_pkt); } 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, pos_min; AVIStream *ast; 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]; ast= st->priv_data; index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags); if (index<0) { if (st->nb_index_entries > 0) av_log(s, AV_LOG_DEBUG, "Failed to find timestamp %"PRId64 " in index %"PRId64 " .. %"PRId64 "\n", timestamp * FFMAX(ast->sample_size, 1), st->index_entries[0].timestamp, st->index_entries[st->nb_index_entries - 1].timestamp); return -1; } /* find the position */ pos = st->index_entries[index].pos; timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1); // 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 */ /* offsets. Calling with other stream indexes should have failed */ /* the av_index_search_timestamp call above. */ assert(stream_index == 0); if(avio_seek(s->pb, pos, SEEK_SET) < 0) return -1; /* Feed the DV video stream version of the timestamp to the */ /* DV demux so it can synthesize correct timestamps. */ ff_dv_offset_reset(avi->dv_demux, timestamp); avi->stream_index= -1; return 0; } pos_min= pos; 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 (ast2->sub_ctx) { seek_subtitle(st, st2, timestamp); continue; } if (st2->nb_index_entries <= 0) continue; // assert(st2->codec->block_align); 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_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); if(index<0) index=0; ast2->seek_pos= st2->index_entries[index].pos; pos_min= FFMIN(pos_min,ast2->seek_pos); } for(i = 0; i < s->nb_streams; i++) { AVStream *st2 = s->streams[i]; AVIStream *ast2 = st2->priv_data; if (ast2->sub_ctx || st2->nb_index_entries <= 0) continue; index = av_index_search_timestamp( st2, av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1), flags | AVSEEK_FLAG_BACKWARD | (st2->codec->codec_type != AVMEDIA_TYPE_VIDEO ? AVSEEK_FLAG_ANY : 0)); if(index<0) index=0; while(!avi->non_interleaved && index>0 && st2->index_entries[index-1].pos >= pos_min) index--; ast2->frame_offset = st2->index_entries[index].timestamp; } /* do the seek */ if (avio_seek(s->pb, pos_min, SEEK_SET) < 0) { av_log(s, AV_LOG_ERROR, "Seek failed\n"); return -1; } avi->stream_index= -1; avi->dts_max= INT_MIN; 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; if (ast) { if (ast->sub_ctx) { av_freep(&ast->sub_ctx->pb); avformat_close_input(&ast->sub_ctx); } av_free(ast->sub_buffer); av_free_packet(&ast->sub_pkt); } } av_free(avi->dv_demux); return 0; } static int avi_probe(AVProbeData *p) { int i; /* check file header */ for(i=0; avi_headers[i][0]; i++) if(!memcmp(p->buf , avi_headers[i] , 4) && !memcmp(p->buf+8, avi_headers[i]+4, 4)) return AVPROBE_SCORE_MAX; return 0; } AVInputFormat ff_avi_demuxer = { .name = "avi", .long_name = NULL_IF_CONFIG_SMALL("AVI format"), .priv_data_size = sizeof(AVIContext), .read_probe = avi_probe, .read_header = avi_read_header, .read_packet = avi_read_packet, .read_close = avi_read_close, .read_seek = avi_read_seek, .priv_class = &demuxer_class, };