mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-20 22:41:11 +00:00
b800327f4c
This commit does for AVInputFormat what commit59c9dc82f4did for AVOutputFormat: It adds a new type FFInputFormat, moves all the internals of AVInputFormat to it and adds a now reduced AVInputFormat as first member. This does not affect/improve extensibility of both public or private fields for demuxers (it is still a mess due to lavd). This is possible since50f34172e0(which removed the last usage of an internal field of AVInputFormat in fftools). (Hint: tools/probetest.c accesses the internals of FFInputFormat as well, but given that it is a testing tool this is not considered a problem.) Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
110 lines
3.3 KiB
C
110 lines
3.3 KiB
C
/*
|
|
* NSP demuxer
|
|
* Copyright (c) 2017 Paul B Mahol
|
|
*
|
|
* 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 "libavutil/avstring.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "avformat.h"
|
|
#include "demux.h"
|
|
#include "internal.h"
|
|
#include "pcm.h"
|
|
|
|
static int nsp_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RB32(p->buf) == AV_RB32("FORM") &&
|
|
AV_RB32(p->buf + 4) == AV_RB32("DS16"))
|
|
return AVPROBE_SCORE_MAX;
|
|
return 0;
|
|
}
|
|
|
|
static int nsp_read_header(AVFormatContext *s)
|
|
{
|
|
int channels = 0, rate = 0;
|
|
uint32_t chunk, size;
|
|
AVStream *st;
|
|
int64_t pos;
|
|
|
|
avio_skip(s->pb, 12);
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
while (!avio_feof(s->pb)) {
|
|
char value[1024];
|
|
|
|
chunk = avio_rb32(s->pb);
|
|
size = avio_rl32(s->pb);
|
|
pos = avio_tell(s->pb);
|
|
|
|
switch (chunk) {
|
|
case MKBETAG('H', 'E', 'D', 'R'):
|
|
case MKBETAG('H', 'D', 'R', '8'):
|
|
if (size < 32)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(s->pb, 20);
|
|
rate = avio_rl32(s->pb);
|
|
avio_skip(s->pb, size - (avio_tell(s->pb) - pos));
|
|
break;
|
|
case MKBETAG('N', 'O', 'T', 'E'):
|
|
avio_get_str(s->pb, size, value, sizeof(value));
|
|
av_dict_set(&s->metadata, "Comment", value, 0);
|
|
avio_skip(s->pb, size & 1);
|
|
break;
|
|
case MKBETAG('S', 'D', 'A', 'B'):
|
|
channels = 2;
|
|
break;
|
|
case MKBETAG('S', 'D', '_', '2'):
|
|
case MKBETAG('S', 'D', '_', '3'):
|
|
case MKBETAG('S', 'D', '_', '4'):
|
|
case MKBETAG('S', 'D', '_', '5'):
|
|
case MKBETAG('S', 'D', '_', '6'):
|
|
case MKBETAG('S', 'D', '_', '7'):
|
|
case MKBETAG('S', 'D', '_', '8'):
|
|
av_log(s, AV_LOG_WARNING, "Unsupported chunk!\n");
|
|
case MKBETAG('S', 'D', 'A', '_'):
|
|
case MKBETAG('S', 'D', '_', 'A'):
|
|
channels = 1;
|
|
break;
|
|
}
|
|
|
|
if (channels)
|
|
break;
|
|
}
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->ch_layout.nb_channels = channels;
|
|
st->codecpar->sample_rate = rate;
|
|
st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
|
|
st->codecpar->block_align = 2 * channels;
|
|
|
|
return 0;
|
|
}
|
|
|
|
const FFInputFormat ff_nsp_demuxer = {
|
|
.p.name = "nsp",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("Computerized Speech Lab NSP"),
|
|
.p.extensions = "nsp",
|
|
.p.flags = AVFMT_GENERIC_INDEX,
|
|
.read_probe = nsp_probe,
|
|
.read_header = nsp_read_header,
|
|
.read_packet = ff_pcm_read_packet,
|
|
.read_seek = ff_pcm_read_seek,
|
|
};
|