mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-11-26 19:01:44 +02:00
6a44699746
Fixes misdetection of 664461_flac_16_44100_2.wav Fixes Ticket3830 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
117 lines
3.5 KiB
C
117 lines
3.5 KiB
C
/*
|
|
* RAW DTS demuxer
|
|
* Copyright (c) 2008 Benjamin Larsson
|
|
*
|
|
* 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 "libavcodec/bytestream.h"
|
|
#include "libavcodec/get_bits.h"
|
|
#include "libavcodec/dca.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[4] = {0};
|
|
int sum, max, i;
|
|
int64_t diff = 0;
|
|
uint8_t hdr[12 + FF_INPUT_BUFFER_PADDING_SIZE] = { 0 };
|
|
|
|
buf = p->buf + FFMIN(4096, p->buf_size);
|
|
|
|
for(; buf < (p->buf+p->buf_size)-2; buf+=2) {
|
|
int marker, sample_blocks, sample_rate, sr_code, framesize;
|
|
GetBitContext gb;
|
|
|
|
bufp = buf;
|
|
state = (state << 16) | bytestream_get_be16(&bufp);
|
|
|
|
if (buf - p->buf >= 4)
|
|
diff += FFABS(((int16_t)AV_RL16(buf)) - (int16_t)AV_RL16(buf-4));
|
|
|
|
/* regular bitstream */
|
|
if (state == DCA_MARKER_RAW_BE)
|
|
marker = 0;
|
|
else if (state == DCA_MARKER_RAW_LE)
|
|
marker = 1;
|
|
|
|
/* 14 bits big-endian bitstream */
|
|
else if (state == DCA_MARKER_14B_BE &&
|
|
(bytestream_get_be16(&bufp) & 0xFFF0) == 0x07F0)
|
|
marker = 2;
|
|
|
|
/* 14 bits little-endian bitstream */
|
|
else if (state == DCA_MARKER_14B_LE &&
|
|
(bytestream_get_be16(&bufp) & 0xF0FF) == 0xF007)
|
|
marker = 3;
|
|
else
|
|
continue;
|
|
|
|
if (avpriv_dca_convert_bitstream(buf-2, 12, hdr, 12) < 0)
|
|
continue;
|
|
|
|
init_get_bits(&gb, hdr, 96);
|
|
skip_bits_long(&gb, 39);
|
|
|
|
sample_blocks = get_bits(&gb, 7) + 1;
|
|
if (sample_blocks < 8)
|
|
continue;
|
|
|
|
framesize = get_bits(&gb, 14) + 1;
|
|
if (framesize < 95)
|
|
continue;
|
|
|
|
skip_bits(&gb, 6);
|
|
sr_code = get_bits(&gb, 4);
|
|
sample_rate = avpriv_dca_sample_rates[sr_code];
|
|
if (sample_rate == 0)
|
|
continue;
|
|
|
|
markers[marker] ++;
|
|
}
|
|
sum = markers[0] + markers[1] + markers[2] + markers[3];
|
|
max = 0;
|
|
for (i=1; i<4; i++)
|
|
if (markers[max] < markers[i])
|
|
max = i;
|
|
if (markers[max] > 3 && p->buf_size / markers[max] < 32*1024 &&
|
|
markers[max] * 4 > sum * 3 &&
|
|
diff / p->buf_size > 200)
|
|
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,
|
|
};
|