mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-27 01:42:20 +00:00
b800327f4c
This commit does for AVInputFormat what commit 59c9dc82f450638a3068deeb1db5c56f6d155752 did 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 since 50f34172e0cca2cabc5836308ec66dbf93f5f2a3 (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>
89 lines
2.5 KiB
C
89 lines
2.5 KiB
C
/*
|
|
* CRYO APC audio format demuxer
|
|
* Copyright (c) 2007 Anssi Hannula <anssi.hannula@gmail.com>
|
|
*
|
|
* 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 <string.h>
|
|
|
|
#include "libavutil/channel_layout.h"
|
|
#include "avformat.h"
|
|
#include "demux.h"
|
|
|
|
static int apc_probe(const AVProbeData *p)
|
|
{
|
|
if (!strncmp(p->buf, "CRYO_APC", 8))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int apc_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVStream *st;
|
|
int ret;
|
|
int channels;
|
|
|
|
avio_rl32(pb); /* CRYO */
|
|
avio_rl32(pb); /* _APC */
|
|
avio_rl32(pb); /* 1.20 */
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
|
|
st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_APC;
|
|
|
|
avio_rl32(pb); /* number of samples */
|
|
st->codecpar->sample_rate = avio_rl32(pb);
|
|
|
|
/* initial predictor values for adpcm decoder */
|
|
if ((ret = ff_get_extradata(s, st->codecpar, pb, 2 * 4)) < 0)
|
|
return ret;
|
|
|
|
channels = !!avio_rl32(pb) + 1;
|
|
av_channel_layout_default(&st->codecpar->ch_layout, channels);
|
|
|
|
st->codecpar->bits_per_coded_sample = 4;
|
|
st->codecpar->bit_rate = (int64_t)st->codecpar->bits_per_coded_sample * channels
|
|
* st->codecpar->sample_rate;
|
|
st->codecpar->block_align = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define MAX_READ_SIZE 4096
|
|
|
|
static int apc_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
if (av_get_packet(s->pb, pkt, MAX_READ_SIZE) <= 0)
|
|
return AVERROR(EIO);
|
|
pkt->stream_index = 0;
|
|
return 0;
|
|
}
|
|
|
|
const FFInputFormat ff_apc_demuxer = {
|
|
.p.name = "apc",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("CRYO APC"),
|
|
.read_probe = apc_probe,
|
|
.read_header = apc_read_header,
|
|
.read_packet = apc_read_packet,
|
|
};
|