/* * 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 */ //#define DEBUG //#define DEBUG_SEEK #include "libavutil/intreadwrite.h" #include "libavutil/bswap.h" #include "avformat.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; 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; uint32_t pal[256]; int has_pal; } AVIStream; typedef struct { 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; } AVIContext; 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 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) { dprintf(NULL, "%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(AVFormatContext *s, ByteIOContext *pb) { AVIContext *avi = s->priv_data; char header[8]; int i; /* check RIFF header */ get_buffer(pb, header, 4); avi->riff_end = get_le32(pb); /* RIFF chunk size */ avi->riff_end += url_ftell(pb); /* RIFF chunk end */ get_buffer(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; 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; int64_t filesize= url_fsize(s->pb); #ifdef DEBUG_SEEK av_log(s, AV_LOG_ERROR, "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); #endif 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; 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= get_le32(pb) + base - 8; int len = get_le32(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); if(ast->sample_size) ast->cum_len += len; else ast->cum_len ++; last_pos= pos; }else{ int64_t offset, pos; int duration; 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); read_braindead_odml_indx(s, frame_num); frame_num += duration; url_fseek(pb, pos, SEEK_SET); } } avi->index_loaded=1; 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) { ByteIOContext *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; get_buffer(pb, value, size); value[size]=0; AV_WL32(key, tag); if(st) return av_metadata_set2(&st->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL); else return av_metadata_set2(&s->metadata, key, value, AV_METADATA_DONT_STRDUP_VAL); } static void avi_read_info(AVFormatContext *s, uint64_t end) { while (url_ftell(s->pb) < end) { uint32_t tag = get_le32(s->pb); uint32_t size = get_le32(s->pb); avi_read_tag(s, NULL, tag, size); } } static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap) { AVIContext *avi = s->priv_data; ByteIOContext *pb = s->pb; unsigned int tag, tag1, handler; int codec_type, stream_index, frame_period, bit_rate; 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; avi->stream_index= -1; if (get_riff(s, pb) < 0) return -1; avi->fsize = url_fsize(pb); if(avi->fsize<=0) 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 = get_le32(pb); size = get_le32(pb); #ifdef DEBUG print_tag("tag", tag, size); #endif 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 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 + (size & 1); else avi->movi_end = url_fsize(pb); dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end); goto end_of_header; } else if (tag1 == MKTAG('I', 'N', 'F', 'O')) avi_read_info(s, list_end); break; case MKTAG('d', 'm', 'l', 'h'): avi->is_odml = 1; url_fskip(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 = 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); get_le32(pb); get_le32(pb); avih_width=get_le32(pb); avih_height=get_le32(pb); url_fskip(pb, size - 10 * 4); break; case MKTAG('s', 't', 'r', 'h'): /* stream header */ tag1 = get_le32(pb); handler = get_le32(pb); /* codec tag */ if(tag1 == MKTAG('p', 'a', 'd', 's')){ url_fskip(pb, size - 8); break; }else{ stream_index++; st = av_new_stream(s, stream_index); if (!st) goto fail; 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'); #ifdef DEBUG print_tag("strh", tag1, -1); #endif 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]); s->nb_streams = 0; if (CONFIG_DV_DEMUXER) { 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); url_fskip(pb, 4); /* start time */ dv_dur = get_le32(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; url_fskip(pb, size - 9*4); break; } assert(stream_index < s->nb_streams); 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)){ 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; } } av_set_pts_info(st, 64, ast->scale, ast->rate); ast->cum_len=get_le32(pb); /* start */ st->nb_frames = get_le32(pb); st->start_time = 0; get_le32(pb); /* buffer size */ get_le32(pb); /* quality */ ast->sample_size = get_le32(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 = 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('d', 'a', 't', 's'): codec_type = CODEC_TYPE_DATA; break; default: av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1); goto fail; } if(ast->sample_size == 0) st->duration = st->nb_frames; ast->frame_offset= ast->cum_len; url_fskip(pb, size - 12 * 4); break; case MKTAG('s', 't', 'r', 'f'): /* stream header */ 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: if(amv_file_format){ st->codec->width=avih_width; st->codec->height=avih_height; st->codec->codec_type = CODEC_TYPE_VIDEO; st->codec->codec_id = CODEC_ID_AMV; url_fskip(pb, size); break; } get_le32(pb); /* size */ st->codec->width = 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); get_le32(pb); /* ImageSize */ get_le32(pb); /* XPelsPerMeter */ get_le32(pb); /* YPelsPerMeter */ get_le32(pb); /* ClrUsed */ get_le32(pb); /* ClrImportant */ if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) { st->codec->codec_type = CODEC_TYPE_SUBTITLE; st->codec->codec_tag = tag1; st->codec->codec_id = CODEC_ID_XSUB; break; } 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); } 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_coded_sample <= 8)) { st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl)); #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 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 = 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(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: 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; } if (size%2) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ url_fskip(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; } if (amv_file_format) st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV; 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); if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){ read_braindead_odml_indx(s, 0); } url_fseek(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]; get_le32(pb); get_le32(pb); get_le32(pb); get_le32(pb); get_le32(pb); active_aspect.den= get_le16(pb); active_aspect.num= get_le16(pb); active.num = get_le32(pb); active.den = get_le32(pb); get_le32(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; } url_fseek(pb, size, SEEK_CUR); 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"); avi->movi_list = url_ftell(pb) - 4; avi->movi_end = url_fsize(pb); goto end_of_header; } /* skip tag */ size += (size & 1); url_fskip(pb, size); break; } } end_of_header: /* check stream number */ if (stream_index != s->nb_streams - 1) { fail: return -1; } if(!avi->index_loaded && !url_is_streamed(pb)) avi_load_index(s); avi->index_loaded = 1; avi->non_interleaved |= guess_ni_flag(s); if(avi->non_interleaved) { av_log(s, AV_LOG_INFO, "non-interleaved AVI\n"); clean_index(s); } return 0; } 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 } } static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; ByteIOContext *pb = s->pb; int n, d[8]; unsigned int size; int64_t i, sync; void* dstr; if (CONFIG_DV_DEMUXER && avi->dv_demux) { int 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; 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 -1; best_ast = best_st->priv_data; 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; } // 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(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; } } resync: if(avi->stream_index >= 0){ AVStream *st= s->streams[ avi->stream_index ]; AVIStream *ast= st->priv_data; int size, err; 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; avi->last_pkt_pos= url_ftell(pb); 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= 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) { 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(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) { 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 (e->flags & AVINDEX_KEYFRAME) 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; } return size; } memset(d, -1, sizeof(int)*8); for(i=sync=url_ftell(pb); !url_feof(pb); i++) { int j; 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); 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]<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') ||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){ url_fskip(pb, size); //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; } 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){ url_fskip(pb, size); goto resync; } //parse ##dc/##wb if(n < s->nb_streams){ AVStream *st; AVIStream *ast; st = s->streams[n]; ast = st->priv_data; 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 == CODEC_TYPE_VIDEO && st1->codec->codec_type == CODEC_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 & 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 (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) { int k = get_byte(pb); int last = (k + get_byte(pb) - 1) & 0xFF; get_le16(pb); //flags for (; k <= last; k++) ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16); ast->has_pal= 1; goto resync; } 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')*/) { //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= 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, size, 0, AVINDEX_KEYFRAME); } } goto resync; } } } return AVERROR_EOF; } /* 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; 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(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) 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(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 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 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; int64_t oldpos= url_ftell(s->pb); 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; 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; } static int avi_load_index(AVFormatContext *s) { AVIContext *avi = s->priv_data; ByteIOContext *pb = s->pb; uint32_t tag, size; int64_t pos= url_ftell(pb); int ret = -1; 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 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; ret = 0; goto the_end; break; default: skip: size += (size & 1); 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 ret; } 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; 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) 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); /* Feed the DV video stream version of the timestamp to the */ /* DV demux so it can synthesize correct timestamps. */ dv_offset_reset(avi->dv_demux, timestamp); url_fseek(s->pb, pos, SEEK_SET); avi->stream_index= -1; return 0; } 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((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); 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(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; } /* 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]; av_free(st->codec->palctrl); } if (avi->dv_demux) 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 avi_demuxer = { "avi", NULL_IF_CONFIG_SMALL("AVI format"), sizeof(AVIContext), avi_probe, avi_read_header, avi_read_packet, avi_read_close, avi_read_seek, .metadata_conv = ff_avi_metadata_conv, };