| /* |
| * MLP and TrueHD demuxer |
| * Copyright (c) 2001 Fabrice Bellard |
| * Copyright (c) 2005 Alex Beregszaszi |
| * Copyright (c) 2015 Carl Eugen Hoyos |
| * |
| * 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 "avformat.h" |
| #include "rawdec.h" |
| #include "libavutil/intreadwrite.h" |
| |
| static int av_always_inline mlp_thd_probe(const AVProbeData *p, uint32_t sync) |
| { |
| const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size; |
| int frames = 0, valid = 0, size = 0; |
| int nsubframes = 0; |
| |
| for (buf = p->buf; buf + 8 <= end; buf++) { |
| if (AV_RB32(buf + 4) == sync) { |
| frames++; |
| if (last_buf + size == buf) { |
| valid += 1 + nsubframes / 8; |
| } |
| nsubframes = 0; |
| last_buf = buf; |
| size = (AV_RB16(buf) & 0xfff) * 2; |
| } else if (buf - last_buf == size) { |
| nsubframes++; |
| size += (AV_RB16(buf) & 0xfff) * 2; |
| } |
| } |
| if (valid >= 100) |
| return AVPROBE_SCORE_MAX; |
| return 0; |
| } |
| |
| #if CONFIG_MLP_DEMUXER |
| static int mlp_probe(const AVProbeData *p) |
| { |
| return mlp_thd_probe(p, 0xf8726fbb); |
| } |
| |
| FF_RAW_DEMUXER_CLASS(mlp) |
| AVInputFormat ff_mlp_demuxer = { |
| .name = "mlp", |
| .long_name = NULL_IF_CONFIG_SMALL("raw MLP"), |
| .read_probe = mlp_probe, |
| .read_header = ff_raw_audio_read_header, |
| .read_packet = ff_raw_read_partial_packet, |
| .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
| .extensions = "mlp", |
| .raw_codec_id = AV_CODEC_ID_MLP, |
| .priv_data_size = sizeof(FFRawDemuxerContext), |
| .priv_class = &mlp_demuxer_class, |
| }; |
| #endif |
| |
| #if CONFIG_TRUEHD_DEMUXER |
| static int thd_probe(const AVProbeData *p) |
| { |
| return mlp_thd_probe(p, 0xf8726fba); |
| } |
| |
| FF_RAW_DEMUXER_CLASS(truehd) |
| AVInputFormat ff_truehd_demuxer = { |
| .name = "truehd", |
| .long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"), |
| .read_probe = thd_probe, |
| .read_header = ff_raw_audio_read_header, |
| .read_packet = ff_raw_read_partial_packet, |
| .flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
| .extensions = "thd", |
| .raw_codec_id = AV_CODEC_ID_TRUEHD, |
| .priv_data_size = sizeof(FFRawDemuxerContext), |
| .priv_class = &truehd_demuxer_class, |
| }; |
| #endif |
| |