FFmpeg/libavformat/afc.c
Andreas Rheinhardt b800327f4c avformat/avformat: Add FFInputFormat, hide internals of AVInputFormat
This commit does for AVInputFormat what commit
59c9dc82f4 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 50f34172e0
(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>
2024-03-07 08:53:31 -03:00

81 lines
2.4 KiB
C

/*
* AFC demuxer
* Copyright (c) 2012 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/channel_layout.h"
#include "avformat.h"
#include "demux.h"
#include "internal.h"
typedef struct AFCDemuxContext {
int64_t data_end;
} AFCDemuxContext;
static int afc_read_header(AVFormatContext *s)
{
AFCDemuxContext *c = s->priv_data;
AVStream *st;
int ret;
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_AFC;
st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
if ((ret = ff_alloc_extradata(st->codecpar, 1)) < 0)
return ret;
st->codecpar->extradata[0] = 8 * st->codecpar->ch_layout.nb_channels;
c->data_end = avio_rb32(s->pb) + 32LL;
st->duration = avio_rb32(s->pb);
st->codecpar->sample_rate = avio_rb16(s->pb);
avio_skip(s->pb, 22);
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
static int afc_read_packet(AVFormatContext *s, AVPacket *pkt)
{
AFCDemuxContext *c = s->priv_data;
int64_t size = c->data_end - avio_tell(s->pb);
int ret;
size = FFMIN(size, 18 * 128);
if (size <= 0)
return AVERROR_EOF;
ret = av_get_packet(s->pb, pkt, size);
pkt->stream_index = 0;
return ret;
}
const FFInputFormat ff_afc_demuxer = {
.p.name = "afc",
.p.long_name = NULL_IF_CONFIG_SMALL("AFC"),
.p.extensions = "afc",
.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK,
.priv_data_size = sizeof(AFCDemuxContext),
.read_header = afc_read_header,
.read_packet = afc_read_packet,
};