/* * 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 <inttypes.h> #include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/opt.h" #include "libavutil/dict.h" #include "libavutil/internal.h" #include "libavutil/intreadwrite.h" #include "libavutil/mathematics.h" #include "avformat.h" #include "avi.h" #include "dv.h" #include "internal.h" #include "isom.h" #include "riff.h" #include "libavcodec/bytestream.h" #include "libavcodec/exif.h" #include "libavcodec/internal.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 handler; 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; AVBufferRef *sub_buffer; int64_t seek_pos; } AVIStream; typedef struct AVIContext { const AVClass *class; int64_t riff_end; int64_t movi_end; int64_t fsize; int64_t io_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_BOOL, {.i64 = 1}, -1, 1, AV_OPT_FLAG_DECODING_PARAM}, { NULL }, }; static const AVClass demuxer_class = { .class_name = "avi", .item_name = av_default_item_name, .option = options, .version = LIBAVUTIL_VERSION_INT, .category = AV_CLASS_CATEGORY_DEMUXER, }; 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(s, str, tag, size) \ av_log(s, AV_LOG_TRACE, "pos:%"PRIX64" %s: tag=%s size=0x%x\n", \ avio_tell(pb), str, av_fourcc2str(tag), 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] = {0}; 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 AVERROR_INVALIDDATA; 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_odml_index(AVFormatContext *s, int frame_num) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int longs_per_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 = ((chunk_id & 0xFF) - '0') * 10 + ((chunk_id >> 8 & 0xFF) - '0'); AVStream *st; AVIStream *ast; int i; int64_t last_pos = -1; int64_t filesize = avi->fsize; av_log(s, AV_LOG_TRACE, "longs_per_entry:%d index_type:%d entries_in_use:%d " "chunk_id:%X base:%16"PRIX64" frame_num:%d\n", longs_per_entry, index_type, entries_in_use, chunk_id, base, frame_num); if (stream_id >= s->nb_streams || stream_id < 0) return AVERROR_INVALIDDATA; st = s->streams[stream_id]; ast = st->priv_data; if (index_sub_type) return AVERROR_INVALIDDATA; avio_rl32(pb); if (index_type && longs_per_entry != 2) return AVERROR_INVALIDDATA; if (index_type > 1) return AVERROR_INVALIDDATA; 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 AVERROR_INVALIDDATA; } 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; av_log(s, AV_LOG_TRACE, "pos:%"PRId64", len:%X\n", pos, len); if (avio_feof(pb)) return AVERROR_INVALIDDATA; if (last_pos == pos || pos == base - 8) avi->non_interleaved = 1; if (last_pos != pos && len) 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 (avio_feof(pb)) return AVERROR_INVALIDDATA; pos = avio_tell(pb); if (avi->odml_depth > MAX_ODML_DEPTH) { av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n"); return AVERROR_INVALIDDATA; } if (avio_seek(pb, offset + 8, SEEK_SET) < 0) return -1; avi->odml_depth++; read_odml_index(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\n"); 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 }; char *value; size += (size & 1); if (size == UINT_MAX) return AVERROR(EINVAL); value = av_malloc(size + 1); if (!value) return AVERROR(ENOMEM); if (avio_read(pb, value, size) != size) { av_freep(&value); return AVERROR_INVALIDDATA; } 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 && !avio_feof(s->pb)) { 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 && !avio_feof(s->pb)) { uint16_t tag = avio_rl16(s->pb); uint16_t size = avio_rl16(s->pb); const char *name = NULL; char buffer[64] = { 0 }; size = FFMIN(size, tag_end - avio_tell(s->pb)); 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_extract_stream_metadata(AVFormatContext *s, AVStream *st) { GetByteContext gb; uint8_t *data = st->codecpar->extradata; int data_size = st->codecpar->extradata_size; int tag, offset; if (!data || data_size < 8) { return AVERROR_INVALIDDATA; } bytestream2_init(&gb, data, data_size); tag = bytestream2_get_le32(&gb); switch (tag) { case MKTAG('A', 'V', 'I', 'F'): // skip 4 byte padding bytestream2_skip(&gb, 4); offset = bytestream2_tell(&gb); // decode EXIF tags from IFD, AVI is always little-endian return avpriv_exif_decode_ifd(s, data + offset, data_size - offset, 1, 0, &st->metadata); break; case MKTAG('C', 'A', 'S', 'I'): avpriv_request_sample(s, "RIFF stream data tag type CASI (%u)", tag); break; case MKTAG('Z', 'o', 'r', 'a'): avpriv_request_sample(s, "RIFF stream data tag type Zora (%u)", tag); break; default: break; } return 0; } static int calculate_bitrate(AVFormatContext *s) { AVIContext *avi = s->priv_data; int i, j; int64_t lensum = 0; int64_t maxpos = 0; for (i = 0; i<s->nb_streams; i++) { int64_t len = 0; AVStream *st = s->streams[i]; if (!st->nb_index_entries) continue; for (j = 0; j < st->nb_index_entries; j++) len += st->index_entries[j].size; maxpos = FFMAX(maxpos, st->index_entries[j-1].pos); lensum += len; } if (maxpos < avi->io_fsize*9/10) // index does not cover the whole file return 0; if (lensum*9/10 > maxpos || lensum < maxpos*9/10) // frame sum and filesize mismatch return 0; for (i = 0; i<s->nb_streams; i++) { int64_t len = 0; AVStream *st = s->streams[i]; int64_t duration; int64_t bitrate; for (j = 0; j < st->nb_index_entries; j++) len += st->index_entries[j].size; if (st->nb_index_entries < 2 || st->codecpar->bit_rate > 0) continue; duration = st->index_entries[j-1].timestamp - st->index_entries[0].timestamp; bitrate = av_rescale(8*len, st->time_base.den, duration * st->time_base.num); if (bitrate > 0) { st->codecpar->bit_rate = bitrate; } } return 1; } 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; int64_t pos; int ret; AVDictionaryEntry *dict_entry; avi->stream_index = -1; ret = get_riff(s, pb); if (ret < 0) return ret; av_log(avi, AV_LOG_DEBUG, "use odml:%d\n", avi->use_odml); avi->io_fsize = 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 (avio_feof(pb)) goto fail; tag = avio_rl32(pb); size = avio_rl32(pb); print_tag(s, "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(s, "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_log(s, AV_LOG_TRACE, "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(s, "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; if (!CONFIG_DV_DEMUXER) return AVERROR_DEMUXER_NOT_FOUND; ast = s->streams[0]->priv_data; st->priv_data = NULL; ff_free_stream(s, st); avi->dv_demux = avpriv_dv_init_demux(s); if (!avi->dv_demux) { av_free(ast); return AVERROR(ENOMEM); } 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; } av_assert0(stream_index < s->nb_streams); ast->handler = 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 %"PRIu32"/%"PRIu32" 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 > 3600LL * ast->rate / ast->scale) { av_log(s, AV_LOG_ERROR, "crazy start time, iam scared, giving up\n"); ast->cum_len = 0; } ast->sample_size = avio_rl32(pb); ast->cum_len *= FFMAX(1, ast->sample_size); av_log(s, AV_LOG_TRACE, "%"PRIu32" %"PRIu32" %d\n", ast->rate, ast->scale, ast->sample_size); switch (tag1) { case MKTAG('v', 'i', 'd', 's'): codec_type = AVMEDIA_TYPE_VIDEO; ast->sample_size = 0; st->avg_frame_rate = av_inv_q(st->time_base); 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) { if (s->error_recognition & AV_EF_EXPLODE) { av_log(s, AV_LOG_ERROR, "Invalid sample_size %d at stream %d\n", ast->sample_size, stream_index); goto fail; } av_log(s, AV_LOG_WARNING, "Invalid sample_size %d at stream %d " "setting it to 0\n", ast->sample_size, stream_index); ast->sample_size = 0; } if (ast->sample_size == 0) { st->duration = st->nb_frames; if (st->duration > 0 && avi->io_fsize > 0 && avi->riff_end > avi->io_fsize) { av_log(s, AV_LOG_DEBUG, "File is truncated adjusting duration\n"); st->duration = av_rescale(st->duration, avi->io_fsize, avi->riff_end); } } ast->frame_offset = ast->cum_len; avio_skip(pb, size - 12 * 4); break; case MKTAG('s', 't', 'r', 'f'): /* stream header */ if (!size && (codec_type == AVMEDIA_TYPE_AUDIO || codec_type == AVMEDIA_TYPE_VIDEO)) 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]; if (st->codecpar->codec_type != AVMEDIA_TYPE_UNKNOWN) { avio_skip(pb, size); break; } switch (codec_type) { case AVMEDIA_TYPE_VIDEO: if (amv_file_format) { st->codecpar->width = avih_width; st->codecpar->height = avih_height; st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_id = AV_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->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; st->codecpar->codec_tag = tag1; st->codecpar->codec_id = AV_CODEC_ID_XSUB; break; } if (size > 10 * 4 && size < (1 << 30) && size < avi->fsize) { if (esize == size-1 && (esize&1)) { st->codecpar->extradata_size = esize - 10 * 4; } else st->codecpar->extradata_size = size - 10 * 4; if (st->codecpar->extradata) { av_log(s, AV_LOG_WARNING, "New extradata in strf chunk, freeing previous one.\n"); } ret = ff_get_extradata(s, st->codecpar, pb, st->codecpar->extradata_size); if (ret < 0) return ret; } // FIXME: check if the encoder really did this correctly if (st->codecpar->extradata_size & 1) 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->codecpar->extradata_size && (st->codecpar->bits_per_coded_sample <= 8)) { int pal_size = (1 << st->codecpar->bits_per_coded_sample) << 2; const uint8_t *pal_src; pal_size = FFMIN(pal_size, st->codecpar->extradata_size); pal_src = st->codecpar->extradata + st->codecpar->extradata_size - pal_size; /* Exclude the "BottomUp" field from the palette */ if (pal_src - st->codecpar->extradata >= 9 && !memcmp(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9)) pal_src -= 9; for (i = 0; i < pal_size / 4; i++) ast->pal[i] = 0xFFU<<24 | AV_RL32(pal_src + 4 * i); ast->has_pal = 1; } print_tag(s, "video", tag1, 0); st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; st->codecpar->codec_tag = tag1; st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1); /* If codec is not found yet, try with the mov tags. */ if (!st->codecpar->codec_id) { st->codecpar->codec_id = ff_codec_get_id(ff_codec_movvideo_tags, tag1); if (st->codecpar->codec_id) av_log(s, AV_LOG_WARNING, "mov tag found in avi (fourcc %s)\n", av_fourcc2str(tag1)); } if (!st->codecpar->codec_id) st->codecpar->codec_id = ff_codec_get_id(ff_codec_bmp_tags_unofficial, tag1); /* This is needed to get the pict type which is necessary * for generating correct pts. */ st->need_parsing = AVSTREAM_PARSE_HEADERS; if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4 && ast->handler == MKTAG('X', 'V', 'I', 'D')) st->codecpar->codec_tag = MKTAG('X', 'V', 'I', 'D'); if (st->codecpar->codec_tag == MKTAG('V', 'S', 'S', 'H')) st->need_parsing = AVSTREAM_PARSE_FULL; if (st->codecpar->codec_id == AV_CODEC_ID_RV40) st->need_parsing = AVSTREAM_PARSE_NONE; if (st->codecpar->codec_id == AV_CODEC_ID_HEVC && st->codecpar->codec_tag == MKTAG('H', '2', '6', '5')) st->need_parsing = AVSTREAM_PARSE_FULL; if (st->codecpar->codec_tag == 0 && st->codecpar->height > 0 && st->codecpar->extradata_size < 1U << 30) { st->codecpar->extradata_size += 9; if ((ret = av_reallocp(&st->codecpar->extradata, st->codecpar->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE)) < 0) { st->codecpar->extradata_size = 0; return ret; } else memcpy(st->codecpar->extradata + st->codecpar->extradata_size - 9, "BottomUp", 9); } st->codecpar->height = FFABS(st->codecpar->height); // avio_skip(pb, size - 5 * 4); break; case AVMEDIA_TYPE_AUDIO: ret = ff_get_wav_header(s, pb, st->codecpar, size, 0); if (ret < 0) return ret; ast->dshow_block_align = st->codecpar->block_align; if (ast->sample_size && st->codecpar->block_align && ast->sample_size != st->codecpar->block_align) { av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codecpar->block_align); ast->sample_size = st->codecpar->block_align; } /* 2-aligned * (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */ if (size & 1) 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->codecpar->codec_id == AV_CODEC_ID_AAC && st->codecpar->extradata_size) st->need_parsing = AVSTREAM_PARSE_NONE; // The flac parser does not work with AVSTREAM_PARSE_TIMESTAMPS if (st->codecpar->codec_id == AV_CODEC_ID_FLAC) 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 (ast->handler == AV_RL32("Axan")) { st->codecpar->codec_id = AV_CODEC_ID_XAN_DPCM; st->codecpar->codec_tag = 0; ast->dshow_block_align = 0; } if (amv_file_format) { st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_AMV; ast->dshow_block_align = 0; } if ((st->codecpar->codec_id == AV_CODEC_ID_AAC || st->codecpar->codec_id == AV_CODEC_ID_FLAC || st->codecpar->codec_id == AV_CODEC_ID_MP2 ) && ast->dshow_block_align <= 4 && ast->dshow_block_align) { av_log(s, AV_LOG_DEBUG, "overriding invalid dshow_block_align of %d\n", ast->dshow_block_align); ast->dshow_block_align = 0; } if (st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 1024 && ast->sample_size == 1024 || st->codecpar->codec_id == AV_CODEC_ID_AAC && ast->dshow_block_align == 4096 && ast->sample_size == 4096 || st->codecpar->codec_id == AV_CODEC_ID_MP3 && ast->dshow_block_align == 1152 && ast->sample_size == 1152) { av_log(s, AV_LOG_DEBUG, "overriding sample_size\n"); ast->sample_size = 0; } break; case AVMEDIA_TYPE_SUBTITLE: st->codecpar->codec_type = AVMEDIA_TYPE_SUBTITLE; st->request_probe= 1; avio_skip(pb, size); break; default: st->codecpar->codec_type = AVMEDIA_TYPE_DATA; st->codecpar->codec_id = AV_CODEC_ID_NONE; st->codecpar->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]->codecpar->extradata_size || s->streams[stream_index]->codecpar->codec_tag == MKTAG('H','2','6','4')) { 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)) { if (st->codecpar->extradata) { av_log(s, AV_LOG_WARNING, "New extradata in strd chunk, freeing previous one.\n"); } if ((ret = ff_get_extradata(s, st->codecpar, pb, size)) < 0) return ret; } if (st->codecpar->extradata_size & 1) //FIXME check if the encoder really did this correctly avio_r8(pb); ret = avi_extract_stream_metadata(s, st); if (ret < 0) { av_log(s, AV_LOG_WARNING, "could not decoding EXIF data in stream header.\n"); } } break; case MKTAG('i', 'n', 'd', 'x'): pos = avio_tell(pb); if ((pb->seekable & AVIO_SEEKABLE_NORMAL) && !(s->flags & AVFMT_FLAG_IGNIDX) && avi->use_odml && read_odml_index(s, 0) < 0 && (s->error_recognition & AV_EF_EXPLODE)) goto fail; avio_seek(pb, pos + 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_TRACE, "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) { ret = avi_read_tag(s, s->streams[s->nb_streams - 1], tag, size); if (ret < 0) return ret; break; } default: if (size > 1000000) { av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, " "tag %s has size %u, " "I will ignore it and try to continue anyway.\n", av_fourcc2str(tag), size); 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; } /* Do not fail for very large idx1 tags */ case MKTAG('i', 'd', 'x', '1'): /* 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 AVERROR_INVALIDDATA; } if (!avi->index_loaded && (pb->seekable & AVIO_SEEKABLE_NORMAL)) avi_load_index(s); calculate_bitrate(s); avi->index_loaded |= 1; if ((ret = guess_ni_flag(s)) < 0) return ret; avi->non_interleaved |= ret | (s->flags & AVFMT_FLAG_SORT_DTS); dict_entry = av_dict_get(s->metadata, "ISFT", NULL, 0); if (dict_entry && !strcmp(dict_entry->value, "PotEncoder")) for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; if ( st->codecpar->codec_id == AV_CODEC_ID_MPEG1VIDEO || st->codecpar->codec_id == AV_CODEC_ID_MPEG2VIDEO) st->need_parsing = AVSTREAM_PARSE_FULL; } 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(AVFormatContext *s, AVStream *st, AVPacket *pkt) { if (pkt->size >= 7 && pkt->size < INT_MAX - AVPROBE_PADDING_SIZE && !strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data + 5) == 2) { uint8_t desc[256]; int score = AVPROBE_SCORE_EXTENSION, ret; AVIStream *ast = st->priv_data; ff_const59 AVInputFormat *sub_demuxer; AVRational time_base; int size; 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 */ size = pb->buf_end - pb->buf_ptr; pd = (AVProbeData) { .buf = av_mallocz(size + AVPROBE_PADDING_SIZE), .buf_size = size }; if (!pd.buf) goto error; memcpy(pd.buf, pb->buf_ptr, size); sub_demuxer = av_probe_input_format2(&pd, 1, &score); av_freep(&pd.buf); if (!sub_demuxer) goto error; if (strcmp(sub_demuxer->name, "srt") && strcmp(sub_demuxer->name, "ass")) goto error; if (!(ast->sub_ctx = avformat_alloc_context())) goto error; ast->sub_ctx->pb = pb; if (ff_copy_whiteblacklists(ast->sub_ctx, s) < 0) goto error; if (!avformat_open_input(&ast->sub_ctx, "", sub_demuxer, NULL)) { if (ast->sub_ctx->nb_streams != 1) goto error; ff_read_packet(ast->sub_ctx, &ast->sub_pkt); avcodec_parameters_copy(st->codecpar, ast->sub_ctx->streams[0]->codecpar); 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->buf; pkt->buf = NULL; av_packet_unref(pkt); return 1; error: av_freep(&ast->sub_ctx); avio_context_free(&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(const unsigned *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); !avio_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); ff_tlog(s, "%X %X %X %X %X %X %X %X %"PRId64" %u %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n); if (i*(avi->io_fsize>0) + (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') || (d[0] == 'i' && d[1] == 'n' && d[2] == 'd' && d[3] == 'x')) { avio_skip(pb, size); 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; } if (d[2] == 'w' && d[3] == 'c' && n < s->nb_streams) { avio_skip(pb, 16 * 3 + 8); goto start_sync; } if (avi->dv_demux && n != 0) continue; // 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, "Skipping 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 ->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st1->codecpar->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 (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 // b + (g << 8) + (r << 16); for (; k <= last; k++) ast->pal[k] = 0xFFU<<24 | avio_rb32(pb)>>8; 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; if (d[2] * 256 + d[3] == ast->prefix) ast->prefix_count++; else { ast->prefix = d[2] * 256 + d[3]; ast->prefix_count = 0; } if (!avi->dv_demux && ((st->discard >= AVDISCARD_DEFAULT && size == 0) /* || // FIXME: needs a little reordering (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY)) */ || st->discard >= AVDISCARD_ALL)) { ast->frame_offset += get_duration(ast, size); avio_skip(pb, size); goto start_sync; } avi->stream_index = n; ast->packet_size = size + 8; ast->remaining = size; if (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 ni_prepare_read(AVFormatContext *s) { AVIContext *avi = s->priv_data; 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_TRACE, "%"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; } 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_assert0(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; return 0; } static int avi_read_packet(AVFormatContext *s, AVPacket *pkt) { AVIContext *avi = s->priv_data; AVIOContext *pb = s->pb; int err; if (CONFIG_DV_DEMUXER && avi->dv_demux) { int size = avpriv_dv_get_packet(avi->dv_demux, pkt); if (size >= 0) return size; else goto resync; } if (avi->non_interleaved) { err = ni_prepare_read(s); if (err < 0) return err; } 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; // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM if (ast->sample_size <= 1) 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->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) { AVBufferRef *avbuf = pkt->buf; size = avpriv_dv_produce_packet(avi->dv_demux, pkt, pkt->data, pkt->size, pkt->pos); pkt->buf = avbuf; pkt->flags |= AV_PKT_FLAG_KEY; if (size < 0) av_packet_unref(pkt); } else if (st->codecpar->codec_type == AVMEDIA_TYPE_SUBTITLE && !st->codecpar->codec_tag && read_gab2_sub(s, 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; pkt->stream_index = avi->stream_index; if (st->codecpar->codec_type == AVMEDIA_TYPE_VIDEO && st->index_entries) { AVIndexEntry *e; int index; index = av_index_search_timestamp(st, ast->frame_offset, AVSEEK_FLAG_ANY); e = &st->index_entries[index]; if (index >= 0 && e->timestamp == ast->frame_offset) { if (index == st->nb_index_entries-1) { int key=1; uint32_t state=-1; if (st->codecpar->codec_id == AV_CODEC_ID_MPEG4) { const uint8_t *ptr = pkt->data, *end = ptr + FFMIN(size, 256); while (ptr < end) { ptr = avpriv_find_start_code(ptr, end, &state); if (state == 0x1B6 && ptr < end) { key = !(*ptr & 0xC0); break; } } } 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 -= err; if (!ast->remaining) { avi->stream_index = -1; ast->packet_size = 0; } if (!avi->non_interleaved && pkt->pos >= 0 && ast->seek_pos > pkt->pos) { av_packet_unref(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) { avi->dts_max = dts; } else if (avi->dts_max - (uint64_t)dts > 2*AV_TIME_BASE) { avi->non_interleaved= 1; av_log(s, AV_LOG_INFO, "Switching to NI mode, due to poor interleaving\n"); } } return 0; } 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; int64_t pos; unsigned int index, tag, flags, len, first_packet = 1; int64_t last_pos = -1; unsigned last_idx = -1; int64_t idx1_pos, first_packet_pos = 0, data_offset = 0; int anykey = 0; nb_index_entries = size / 16; if (nb_index_entries <= 0) return AVERROR_INVALIDDATA; 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); if (s->nb_streams == 1 && s->streams[0]->codecpar->codec_tag == AV_RL32("MMES")) { first_packet_pos = 0; data_offset = avi->movi_list; } /* Read the entries and sort them in each stream component. */ for (i = 0; i < nb_index_entries; i++) { if (avio_feof(pb)) return -1; tag = avio_rl32(pb); flags = avio_rl32(pb); pos = avio_rl32(pb); len = avio_rl32(pb); av_log(s, AV_LOG_TRACE, "%d: tag=0x%x flags=0x%x pos=0x%"PRIx64" 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; /* Skip 'xxpc' palette change entries in the index until a logic * to process these is properly implemented. */ if ((tag >> 16 & 0xff) == 'p' && (tag >> 24 & 0xff) == 'c') continue; if (first_packet && first_packet_pos) { if (avi->movi_list + 4 != pos || pos + 500 > first_packet_pos) data_offset = first_packet_pos - pos; first_packet = 0; } pos += data_offset; av_log(s, AV_LOG_TRACE, "%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; anykey |= flags&AVIIF_INDEX; } if (!anykey) { for (index = 0; index < s->nb_streams; index++) { st = s->streams[index]; if (st->nb_index_entries) st->index_entries[0].flags |= AVINDEX_KEYFRAME; } } return 0; } /* Scan the index and consider any file with streams more than * 2 seconds or 64MB apart non-interleaved. */ static int check_stream_max_drift(AVFormatContext *s) { int64_t min_pos, pos; int i; int *idx = av_mallocz_array(s->nb_streams, sizeof(*idx)); if (!idx) return AVERROR(ENOMEM); for (min_pos = pos = 0; min_pos != INT64_MAX; pos = min_pos + 1LU) { int64_t max_dts = INT64_MIN / 2; int64_t min_dts = INT64_MAX / 2; int64_t max_buffer = 0; min_pos = INT64_MAX; for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; AVIStream *ast = st->priv_data; int n = st->nb_index_entries; while (idx[i] < n && st->index_entries[idx[i]].pos < pos) idx[i]++; if (idx[i] < n) { int64_t dts; dts = av_rescale_q(st->index_entries[idx[i]].timestamp / FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q); min_dts = FFMIN(min_dts, dts); min_pos = FFMIN(min_pos, st->index_entries[idx[i]].pos); } } for (i = 0; i < s->nb_streams; i++) { AVStream *st = s->streams[i]; AVIStream *ast = st->priv_data; if (idx[i] && min_dts != INT64_MAX / 2) { int64_t dts; dts = av_rescale_q(st->index_entries[idx[i] - 1].timestamp / FFMAX(ast->sample_size, 1), st->time_base, AV_TIME_BASE_Q); max_dts = FFMAX(max_dts, dts); max_buffer = FFMAX(max_buffer, av_rescale(dts - min_dts, st->codecpar->bit_rate, AV_TIME_BASE)); } } if (max_dts - min_dts > 2 * AV_TIME_BASE || max_buffer > 1024 * 1024 * 8 * 8) { av_free(idx); return 1; } } av_free(idx); 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); 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; unsigned tag[2]; avio_seek(s->pb, pos, SEEK_SET); tag[0] = avio_r8(s->pb); tag[1] = avio_r8(s->pb); avio_rl16(s->pb); size = avio_rl32(s->pb); if (get_stream_idx(tag) == i && pos + size > st->index_entries[1].pos) last_start = INT64_MAX; if (get_stream_idx(tag) == i && size == st->index_entries[0].size + 8) 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; return check_stream_max_drift(s); } 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); int64_t next; int ret = -1; if (avio_seek(pb, avi->movi_end, SEEK_SET) < 0) goto the_end; // maybe truncated file av_log(s, AV_LOG_TRACE, "movi_end=0x%"PRIx64"\n", avi->movi_end); for (;;) { tag = avio_rl32(pb); size = avio_rl32(pb); if (avio_feof(pb)) break; next = avio_tell(pb) + size + (size & 1); if (tag == MKTAG('i', 'd', 'x', '1') && avi_read_idx1(s, size) >= 0) { avi->index_loaded=2; ret = 0; }else if (tag == MKTAG('L', 'I', 'S', 'T')) { uint32_t tag1 = avio_rl32(pb); if (tag1 == MKTAG('I', 'N', 'F', 'O')) ff_read_riff_info(s, size - 4); }else if (!ret) break; if (avio_seek(pb, next, SEEK_SET) < 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_packet_unref(&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; /* Does not matter which stream is requested dv in avi has the * stream information in the first video stream. */ if (avi->dv_demux) stream_index = 0; if (!avi->index_loaded) { /* we only load the index on demand */ avi_load_index(s); avi->index_loaded |= 1; } av_assert0(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 AVERROR_INVALIDDATA; } /* 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_TRACE, "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. */ 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; // av_assert1(st2->codecpar->block_align); 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->codecpar->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->codecpar->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_buffer_unref(&ast->sub_buffer); av_packet_unref(&ast->sub_pkt); } } av_freep(&avi->dv_demux); return 0; } static int avi_probe(const AVProbeData *p) { int i; /* check file header */ for (i = 0; avi_headers[i][0]; i++) if (AV_RL32(p->buf ) == AV_RL32(avi_headers[i] ) && AV_RL32(p->buf + 8) == AV_RL32(avi_headers[i] + 4)) return AVPROBE_SCORE_MAX; return 0; } AVInputFormat ff_avi_demuxer = { .name = "avi", .long_name = NULL_IF_CONFIG_SMALL("AVI (Audio Video Interleaved)"), .priv_data_size = sizeof(AVIContext), .extensions = "avi", .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, };