mirror of
https://git.ffmpeg.org/ffmpeg.git
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131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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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 "config_components.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "internal.h"
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#include "rawdec.h"
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#include "libavutil/intreadwrite.h"
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#include "libavcodec/mlp.h"
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#include "libavcodec/mlp_parse.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 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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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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static int mlp_read_header(AVFormatContext *s)
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{
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int ret = ff_raw_audio_read_header(s);
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if (ret < 0)
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return ret;
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ret = ffio_ensure_seekback(s->pb, 10);
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if (ret == 0) {
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uint8_t buffer[10];
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int read, sample_rate = 0;
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read = avio_read(s->pb, buffer, 10);
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if (read == 10) {
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switch (buffer[7]) {
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case SYNC_TRUEHD:
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sample_rate = mlp_samplerate(buffer[8] >> 4);
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break;
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case SYNC_MLP:
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sample_rate = mlp_samplerate(buffer[9] >> 4);
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break;
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}
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if (sample_rate)
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avpriv_set_pts_info(s->streams[0], 64, 1, sample_rate);
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}
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if (read > 0)
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avio_seek(s->pb, -read, SEEK_CUR);
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}
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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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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 = mlp_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 = &ff_raw_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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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 = mlp_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 = &ff_raw_demuxer_class,
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};
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#endif
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