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.
77 lines
2.4 KiB
77 lines
2.4 KiB
/* |
|
* RAW DTS demuxer |
|
* Copyright (c) 2008 Benjamin Larsson |
|
* |
|
* This file is part of Libav. |
|
* |
|
* Libav 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. |
|
* |
|
* Libav 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 Libav; if not, write to the Free Software |
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
|
*/ |
|
|
|
#include "libavcodec/bytestream.h" |
|
#include "avformat.h" |
|
#include "rawdec.h" |
|
|
|
#define DCA_MARKER_14B_BE 0x1FFFE800 |
|
#define DCA_MARKER_14B_LE 0xFF1F00E8 |
|
#define DCA_MARKER_RAW_BE 0x7FFE8001 |
|
#define DCA_MARKER_RAW_LE 0xFE7F0180 |
|
|
|
static int dts_probe(AVProbeData *p) |
|
{ |
|
const uint8_t *buf, *bufp; |
|
uint32_t state = -1; |
|
int markers[3] = {0}; |
|
int sum, max; |
|
|
|
buf = p->buf; |
|
|
|
for(; buf < (p->buf+p->buf_size)-2; buf+=2) { |
|
bufp = buf; |
|
state = (state << 16) | bytestream_get_be16(&bufp); |
|
|
|
/* regular bitstream */ |
|
if (state == DCA_MARKER_RAW_BE || state == DCA_MARKER_RAW_LE) |
|
markers[0]++; |
|
|
|
/* 14 bits big-endian bitstream */ |
|
if (state == DCA_MARKER_14B_BE) |
|
if ((bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0) |
|
markers[1]++; |
|
|
|
/* 14 bits little-endian bitstream */ |
|
if (state == DCA_MARKER_14B_LE) |
|
if ((bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007) |
|
markers[2]++; |
|
} |
|
sum = markers[0] + markers[1] + markers[2]; |
|
max = markers[1] > markers[0]; |
|
max = markers[2] > markers[max] ? 2 : max; |
|
if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 && |
|
markers[max] * 4 > sum * 3) |
|
return AVPROBE_SCORE_EXTENSION + 1; |
|
|
|
return 0; |
|
} |
|
|
|
AVInputFormat ff_dts_demuxer = { |
|
.name = "dts", |
|
.long_name = NULL_IF_CONFIG_SMALL("raw DTS"), |
|
.read_probe = dts_probe, |
|
.read_header = ff_raw_audio_read_header, |
|
.read_packet = ff_raw_read_partial_packet, |
|
.flags = AVFMT_GENERIC_INDEX, |
|
.extensions = "dts", |
|
.raw_codec_id = AV_CODEC_ID_DTS, |
|
};
|
|
|