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94 lines
2.9 KiB
94 lines
2.9 KiB
/* |
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* MLP and TrueHD demuxer |
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* Copyright (c) 2001 Fabrice Bellard |
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* Copyright (c) 2005 Alex Beregszaszi |
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* Copyright (c) 2015 Carl Eugen Hoyos |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avformat.h" |
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#include "rawdec.h" |
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#include "libavutil/intreadwrite.h" |
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static int av_always_inline mlp_thd_probe(const AVProbeData *p, uint32_t sync) |
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{ |
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const uint8_t *buf, *last_buf = p->buf, *end = p->buf + p->buf_size; |
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int frames = 0, valid = 0, size = 0; |
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int nsubframes = 0; |
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for (buf = p->buf; buf + 8 <= end; buf++) { |
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if (AV_RB32(buf + 4) == sync) { |
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frames++; |
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if (last_buf + size == buf) { |
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valid += 1 + nsubframes / 8; |
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} |
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nsubframes = 0; |
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last_buf = buf; |
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size = (AV_RB16(buf) & 0xfff) * 2; |
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} else if (buf - last_buf == size) { |
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nsubframes++; |
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size += (AV_RB16(buf) & 0xfff) * 2; |
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} |
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} |
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if (valid >= 100) |
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return AVPROBE_SCORE_MAX; |
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return 0; |
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} |
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#if CONFIG_MLP_DEMUXER |
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static int mlp_probe(const AVProbeData *p) |
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{ |
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return mlp_thd_probe(p, 0xf8726fbb); |
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} |
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FF_RAW_DEMUXER_CLASS(mlp) |
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const AVInputFormat ff_mlp_demuxer = { |
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.name = "mlp", |
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.long_name = NULL_IF_CONFIG_SMALL("raw MLP"), |
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.read_probe = mlp_probe, |
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.read_header = ff_raw_audio_read_header, |
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.read_packet = ff_raw_read_partial_packet, |
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
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.extensions = "mlp", |
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.raw_codec_id = AV_CODEC_ID_MLP, |
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.priv_data_size = sizeof(FFRawDemuxerContext), |
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.priv_class = &mlp_demuxer_class, |
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}; |
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#endif |
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#if CONFIG_TRUEHD_DEMUXER |
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static int thd_probe(const AVProbeData *p) |
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{ |
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return mlp_thd_probe(p, 0xf8726fba); |
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} |
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FF_RAW_DEMUXER_CLASS(truehd) |
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const AVInputFormat ff_truehd_demuxer = { |
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.name = "truehd", |
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.long_name = NULL_IF_CONFIG_SMALL("raw TrueHD"), |
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.read_probe = thd_probe, |
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.read_header = ff_raw_audio_read_header, |
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.read_packet = ff_raw_read_partial_packet, |
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.flags = AVFMT_GENERIC_INDEX | AVFMT_NOTIMESTAMPS, |
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.extensions = "thd", |
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.raw_codec_id = AV_CODEC_ID_TRUEHD, |
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.priv_data_size = sizeof(FFRawDemuxerContext), |
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.priv_class = &truehd_demuxer_class, |
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}; |
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#endif |
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