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mirror of https://git.ffmpeg.org/ffmpeg.git synced 2024-12-26 09:12:33 +00:00
ffmpeg/libavformat/acm.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

76 lines
2.5 KiB
C

/*
* ACM demuxer
* Copyright (c) 2015 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/intreadwrite.h"
#include "avformat.h"
#include "demux.h"
#include "rawdec.h"
#include "internal.h"
static int acm_probe(const AVProbeData *p)
{
if (AV_RB32(p->buf) != 0x97280301)
return 0;
return AVPROBE_SCORE_MAX / 3 * 2;
}
static int acm_read_header(AVFormatContext *s)
{
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_INTERPLAY_ACM;
ret = ff_get_extradata(s, st->codecpar, s->pb, 14);
if (ret < 0)
return ret;
st->codecpar->ch_layout.nb_channels = AV_RL16(st->codecpar->extradata + 8);
st->codecpar->sample_rate = AV_RL16(st->codecpar->extradata + 10);
if (st->codecpar->ch_layout.nb_channels <= 0 || st->codecpar->sample_rate <= 0)
return AVERROR_INVALIDDATA;
st->start_time = 0;
st->duration = AV_RL32(st->codecpar->extradata + 4) / st->codecpar->ch_layout.nb_channels;
ffstream(st)->need_parsing = AVSTREAM_PARSE_FULL_RAW;
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
return 0;
}
const FFInputFormat ff_acm_demuxer = {
.p.name = "acm",
.p.long_name = NULL_IF_CONFIG_SMALL("Interplay ACM"),
.p.flags = AVFMT_NOBINSEARCH | AVFMT_NOGENSEARCH | AVFMT_NO_BYTE_SEEK | AVFMT_NOTIMESTAMPS,
.p.extensions = "acm",
.p.priv_class = &ff_raw_demuxer_class,
.read_probe = acm_probe,
.read_header = acm_read_header,
.read_packet = ff_raw_read_partial_packet,
.raw_codec_id = AV_CODEC_ID_INTERPLAY_ACM,
.priv_data_size = sizeof(FFRawDemuxerContext),
};