mirror of https://github.com/FFmpeg/FFmpeg.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
94 lines
2.9 KiB
94 lines
2.9 KiB
/* |
|
* 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 |
|
|
|
|