95 lines
2.9 KiB
C
95 lines
2.9 KiB
C
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/*
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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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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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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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