static int epaf_read_header(AVFormatContext *s) { int le, sample_rate, codec, channels; AVStream *st; avio_skip(s->pb, 4); if (avio_rl32(s->pb)) return AVERROR_INVALIDDATA; le = avio_rl32(s->pb); if (le && le != 1) return AVERROR_INVALIDDATA; if (le) { sample_rate = avio_rl32(s->pb); codec = avio_rl32(s->pb); channels = avio_rl32(s->pb); } else { sample_rate = avio_rb32(s->pb); codec = avio_rb32(s->pb); channels = avio_rb32(s->pb); } if (!channels || !sample_rate) return AVERROR_INVALIDDATA; st = avformat_new_stream(s, NULL); if (!st) return AVERROR(ENOMEM); st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; st->codecpar->channels = channels; st->codecpar->sample_rate = sample_rate; switch (codec) { case 0: st->codecpar->codec_id = le ? AV_CODEC_ID_PCM_S16LE : AV_CODEC_ID_PCM_S16BE; break; case 2: st->codecpar->codec_id = AV_CODEC_ID_PCM_S8; break; case 1: avpriv_request_sample(s, "24-bit Paris PCM format"); default: return AVERROR_INVALIDDATA; } st->codecpar->bits_per_coded_sample = av_get_bits_per_sample(st->codecpar->codec_id); st->codecpar->block_align = st->codecpar->bits_per_coded_sample * st->codecpar->channels / 8; avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); if (avio_skip(s->pb, 2024) < 0) return AVERROR_INVALIDDATA; return 0; }