static int wav_read_header(AVFormatContext *s) { int64_t size, av_uninit(data_size); int64_t sample_count = 0; int rf64; uint32_t tag; AVIOContext *pb = s->pb; AVStream *st = NULL; WAVDemuxContext *wav = s->priv_data; int ret, got_fmt = 0; int64_t next_tag_ofs, data_ofs = -1; wav->unaligned = avio_tell(s->pb) & 1; wav->smv_data_ofs = -1; /* check RIFF header */ tag = avio_rl32(pb); rf64 = tag == MKTAG('R', 'F', '6', '4'); wav->rifx = tag == MKTAG('R', 'I', 'F', 'X'); if (!rf64 && !wav->rifx && tag != MKTAG('R', 'I', 'F', 'F')) return AVERROR_INVALIDDATA; avio_rl32(pb); /* file size */ tag = avio_rl32(pb); if (tag != MKTAG('W', 'A', 'V', 'E')) return AVERROR_INVALIDDATA; if (rf64) { if (avio_rl32(pb) != MKTAG('d', 's', '6', '4')) return AVERROR_INVALIDDATA; size = avio_rl32(pb); if (size < 24) return AVERROR_INVALIDDATA; avio_rl64(pb); /* RIFF size */ data_size = avio_rl64(pb); sample_count = avio_rl64(pb); if (data_size < 0 || sample_count < 0) { av_log(s, AV_LOG_ERROR, "negative data_size and/or sample_count in " "ds64: data_size = %"PRId64", sample_count = %"PRId64"\n", data_size, sample_count); return AVERROR_INVALIDDATA; } avio_skip(pb, size - 24); /* skip rest of ds64 chunk */ } for (;;) { AVStream *vst; size = next_tag(pb, &tag, wav->rifx); next_tag_ofs = avio_tell(pb) + size; if (avio_feof(pb)) break; switch (tag) { case MKTAG('f', 'm', 't', ' '): /* only parse the first 'fmt ' tag found */ if (!got_fmt && (ret = wav_parse_fmt_tag(s, size, &st)) < 0) { return ret; } else if (got_fmt) av_log(s, AV_LOG_WARNING, "found more than one 'fmt ' tag\n"); got_fmt = 1; break; case MKTAG('d', 'a', 't', 'a'): if (!got_fmt) { av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'data' tag\n"); return AVERROR_INVALIDDATA; } if (rf64) { next_tag_ofs = wav->data_end = avio_tell(pb) + data_size; } else { data_size = size; next_tag_ofs = wav->data_end = size ? next_tag_ofs : INT64_MAX; } data_ofs = avio_tell(pb); /* don't look for footer metadata if we can't seek or if we don't * know where the data tag ends */ if (!pb->seekable || (!rf64 && !size)) goto break_loop; break; case MKTAG('f', 'a', 'c', 't'): if (!sample_count) sample_count = (!wav->rifx ? avio_rl32(pb) : avio_rb32(pb)); break; case MKTAG('b', 'e', 'x', 't'): if ((ret = wav_parse_bext_tag(s, size)) < 0) return ret; break; case MKTAG('S','M','V','0'): if (!got_fmt) { av_log(s, AV_LOG_ERROR, "found no 'fmt ' tag before the 'SMV0' tag\n"); return AVERROR_INVALIDDATA; } // SMV file, a wav file with video appended. if (size != MKTAG('0','2','0','0')) { av_log(s, AV_LOG_ERROR, "Unknown SMV version found\n"); goto break_loop; } av_log(s, AV_LOG_DEBUG, "Found SMV data\n"); wav->smv_given_first = 0; vst = avformat_new_stream(s, NULL); if (!vst) return AVERROR(ENOMEM); avio_r8(pb); vst->id = 1; vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; vst->codec->codec_id = AV_CODEC_ID_SMVJPEG; vst->codec->width = avio_rl24(pb); vst->codec->height = avio_rl24(pb); if (ff_alloc_extradata(vst->codec, 4)) { av_log(s, AV_LOG_ERROR, "Could not allocate extradata.\n"); return AVERROR(ENOMEM); } size = avio_rl24(pb); wav->smv_data_ofs = avio_tell(pb) + (size - 5) * 3; avio_rl24(pb); wav->smv_block_size = avio_rl24(pb); avpriv_set_pts_info(vst, 32, 1, avio_rl24(pb)); vst->duration = avio_rl24(pb); avio_rl24(pb); avio_rl24(pb); wav->smv_frames_per_jpeg = avio_rl24(pb); if (wav->smv_frames_per_jpeg > 65536) { av_log(s, AV_LOG_ERROR, "too many frames per jpeg\n"); return AVERROR_INVALIDDATA; } AV_WL32(vst->codec->extradata, wav->smv_frames_per_jpeg); wav->smv_cur_pt = 0; goto break_loop; case MKTAG('L', 'I', 'S', 'T'): if (size < 4) { av_log(s, AV_LOG_ERROR, "too short LIST tag\n"); return AVERROR_INVALIDDATA; } switch (avio_rl32(pb)) { case MKTAG('I', 'N', 'F', 'O'): ff_read_riff_info(s, size - 4); } break; } /* seek to next tag unless we know that we'll run into EOF */ if ((avio_size(pb) > 0 && next_tag_ofs >= avio_size(pb)) || wav_seek_tag(wav, pb, next_tag_ofs, SEEK_SET) < 0) { break; } } break_loop: if (data_ofs < 0) { av_log(s, AV_LOG_ERROR, "no 'data' tag found\n"); return AVERROR_INVALIDDATA; } avio_seek(pb, data_ofs, SEEK_SET); if ( data_size > 0 && sample_count && st->codec->channels && data_size / sample_count / st->codec->channels > 8) { av_log(s, AV_LOG_WARNING, "ignoring wrong sample_count %"PRId64"\n", sample_count); sample_count = 0; } if (!sample_count || av_get_exact_bits_per_sample(st->codec->codec_id) > 0) if ( st->codec->channels && data_size && av_get_bits_per_sample(st->codec->codec_id) && wav->data_end <= avio_size(pb)) sample_count = (data_size << 3) / (st->codec->channels * (uint64_t)av_get_bits_per_sample(st->codec->codec_id)); if (sample_count) st->duration = sample_count; ff_metadata_conv_ctx(s, NULL, wav_metadata_conv); ff_metadata_conv_ctx(s, NULL, ff_riff_info_conv); return 0; }