static int rsd_read_header(AVFormatContext *s) { AVIOContext *pb = s->pb; int i, ret, version, start = 0x800; AVCodecParameters *par; AVStream *st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); avio_skip(pb, 3); // "RSD" version = avio_r8(pb) - '0'; par = st->codecpar; par->codec_type = AVMEDIA_TYPE_AUDIO; par->codec_tag = avio_rl32(pb); par->codec_id = ff_codec_get_id(rsd_tags, par->codec_tag); if (!par->codec_id) { char tag_buf[32]; av_get_codec_tag_string(tag_buf, sizeof(tag_buf), par->codec_tag); for (i=0; i < FF_ARRAY_ELEMS(rsd_unsupported_tags); i++) { if (par->codec_tag == rsd_unsupported_tags[i]) { avpriv_request_sample(s, "Codec tag: %s", tag_buf); return AVERROR_PATCHWELCOME; } } av_log(s, AV_LOG_ERROR, "Unknown codec tag: %s\n", tag_buf); return AVERROR_INVALIDDATA; } par->channels = avio_rl32(pb); if (!par->channels) return AVERROR_INVALIDDATA; avio_skip(pb, 4); // Bit depth par->sample_rate = avio_rl32(pb); if (!par->sample_rate) return AVERROR_INVALIDDATA; avio_skip(pb, 4); // Unknown switch (par->codec_id) { case AV_CODEC_ID_XMA2: par->block_align = 2048; ff_alloc_extradata(par, 34); if (!par->extradata) return AVERROR(ENOMEM); memset(par->extradata, 0, 34); break; case AV_CODEC_ID_ADPCM_PSX: par->block_align = 16 * par->channels; if (pb->seekable) st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start); break; case AV_CODEC_ID_ADPCM_IMA_RAD: par->block_align = 20 * par->channels; if (pb->seekable) st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start); break; case AV_CODEC_ID_ADPCM_IMA_WAV: if (version == 2) start = avio_rl32(pb); par->bits_per_coded_sample = 4; par->block_align = 36 * par->channels; if (pb->seekable) st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start); break; case AV_CODEC_ID_ADPCM_THP_LE: /* RSD3GADP is mono, so only alloc enough memory to store the coeff table for a single channel. */ start = avio_rl32(pb); if ((ret = ff_get_extradata(s, par, s->pb, 32)) < 0) return ret; if (pb->seekable) st->duration = av_get_audio_frame_duration2(par, avio_size(pb) - start); break; case AV_CODEC_ID_ADPCM_THP: par->block_align = 8 * par->channels; avio_skip(s->pb, 0x1A4 - avio_tell(s->pb)); if ((ret = ff_alloc_extradata(st->codecpar, 32 * par->channels)) < 0) return ret; for (i = 0; i < par->channels; i++) { avio_read(s->pb, st->codecpar->extradata + 32 * i, 32); avio_skip(s->pb, 8); } if (pb->seekable) st->duration = (avio_size(pb) - start) / (8 * par->channels) * 14; break; case AV_CODEC_ID_PCM_S16LE: case AV_CODEC_ID_PCM_S16BE: if (version != 4) start = avio_rl32(pb); if (pb->seekable) st->duration = (avio_size(pb) - start) / 2 / par->channels; break; } avio_skip(pb, start - avio_tell(pb)); if (par->codec_id == AV_CODEC_ID_XMA2) { avio_skip(pb, avio_rb32(pb) + avio_rb32(pb)); st->duration = avio_rb32(pb); } avpriv_set_pts_info(st, 64, 1, par->sample_rate); return 0; }