blob: d82df219d997c33767467d4da20c75dad3c9ecab
| 1 | /* |
| 2 | * MLP and TrueHD demuxer |
| 3 | * Copyright (c) 2001 Fabrice Bellard |
| 4 | * Copyright (c) 2005 Alex Beregszaszi |
| 5 | * Copyright (c) 2015 Carl Eugen Hoyos |
| 6 | * |
| 7 | * This file is part of FFmpeg. |
| 8 | * |
| 9 | * FFmpeg is free software; you can redistribute it and/or |
| 10 | * modify it under the terms of the GNU Lesser General Public |
| 11 | * License as published by the Free Software Foundation; either |
| 12 | * version 2.1 of the License, or (at your option) any later version. |
| 13 | * |
| 14 | * FFmpeg is distributed in the hope that it will be useful, |
| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 17 | * Lesser General Public License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with FFmpeg; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| 22 | */ |
| 23 | |
| 24 | #include "avformat.h" |
| 25 | #include "rawdec.h" |
| 26 | #include "libavutil/intreadwrite.h" |
| 27 | |
| 28 | static int av_always_inline mlp_thd_probe(AVProbeData *p, uint32_t sync) |
| 29 | { |
| 30 | const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size; |
| 31 | int frames = 0, valid = 0, size = 0; |
| 32 | int nsubframes = 0; |
| 33 | |
| 34 | for (buf = p->buf; buf + 8 <= end; buf++) { |
| 35 | if (AV_RB32(buf + 4) == sync) { |
| 36 | frames++; |
| 37 | if (last_buf + size == buf) { |
| 38 | valid += 1 + nsubframes / 8; |
| 39 | } |
| 40 | nsubframes = 0; |
| 41 | last_buf = buf; |
| 42 | size = (AV_RB16(buf) & 0xfff) * 2; |
| 43 | } else if (buf - last_buf == size) { |
| 44 | nsubframes++; |
| 45 | size += (AV_RB16(buf) & 0xfff) * 2; |
| 46 | } |
| 47 | } |
| 48 | if (valid >= 100) |
| 49 | return AVPROBE_SCORE_MAX; |
| 50 | return 0; |
| 51 | } |
| 52 | |
| 53 | #if CONFIG_MLP_DEMUXER |
| 54 | static int mlp_probe(AVProbeData *p) |
| 55 | { |
| 56 | return mlp_thd_probe(p, 0xf8726fbb); |
| 57 | } |
| 58 | |
| 59 | AVInputFormat ff_mlp_demuxer = { |
| 60 | .name = "mlp", |
| 61 | .long_name = NULL_IF_CONFIG_SMALL("raw MLP"), |
| 62 | .read_probe = mlp_probe, |
| 63 | .read_header = ff_raw_audio_read_header, |
| 64 | .read_packet = ff_raw_read_partial_packet, |
| 65 | .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
| 66 | .extensions = "mlp", |
| 67 | .raw_codec_id = AV_CODEC_ID_MLP, |
| 68 | }; |
| 69 | #endif |
| 70 | |
| 71 | #if CONFIG_TRUEHD_DEMUXER |
| 72 | static int thd_probe(AVProbeData *p) |
| 73 | { |
| 74 | return mlp_thd_probe(p, 0xf8726fba); |
| 75 | } |
| 76 | |
| 77 | AVInputFormat ff_truehd_demuxer = { |
| 78 | .name = "truehd", |
| 79 | .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"), |
| 80 | .read_probe = thd_probe, |
| 81 | .read_header = ff_raw_audio_read_header, |
| 82 | .read_packet = ff_raw_read_partial_packet, |
| 83 | .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
| 84 | .extensions = "thd", |
| 85 | .raw_codec_id = AV_CODEC_ID_TRUEHD, |
| 86 | }; |
| 87 | #endif |
| 88 | |
| 89 |