mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-23 15:53:08 +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>
116 lines
3.4 KiB
C
116 lines
3.4 KiB
C
/*
|
|
* ACE demuxer
|
|
* Copyright (c) 2020 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 "internal.h"
|
|
|
|
static int ace_probe(const AVProbeData *p)
|
|
{
|
|
uint32_t asc;
|
|
|
|
if (AV_RB32(p->buf) != MKBETAG('A','A','C',' '))
|
|
return 0;
|
|
if (p->buf_size < 0x44)
|
|
return 0;
|
|
asc = AV_RB32(p->buf + 0x40);
|
|
if (asc < 0x44 || asc > p->buf_size - 4)
|
|
return 0;
|
|
if (AV_RB32(p->buf + asc) != MKBETAG('A','S','C',' '))
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX / 2 + 1;
|
|
}
|
|
|
|
static int ace_read_header(AVFormatContext *s)
|
|
{
|
|
AVIOContext *pb = s->pb;
|
|
AVCodecParameters *par;
|
|
int ret, codec, rate, nb_channels;
|
|
uint32_t asc_pos, size;
|
|
AVStream *st;
|
|
|
|
avio_skip(pb, 0x40);
|
|
asc_pos = avio_rb32(pb);
|
|
if (asc_pos < 0x44)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(pb, asc_pos - 0x44);
|
|
if (avio_rb32(pb) != MKBETAG('A','S','C',' '))
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(pb, 0xec);
|
|
codec = avio_rb32(pb);
|
|
nb_channels = avio_rb32(pb);
|
|
if (nb_channels <= 0 || nb_channels > 8)
|
|
return AVERROR_INVALIDDATA;
|
|
size = avio_rb32(pb);
|
|
if (size == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
rate = avio_rb32(pb);
|
|
if (rate <= 0)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(pb, 16);
|
|
|
|
st = avformat_new_stream(s, NULL);
|
|
if (!st)
|
|
return AVERROR(ENOMEM);
|
|
st->start_time = 0;
|
|
par = st->codecpar;
|
|
par->codec_type = AVMEDIA_TYPE_AUDIO;
|
|
par->ch_layout.nb_channels = nb_channels;
|
|
par->sample_rate = rate;
|
|
par->block_align = (codec == 4 ? 0x60 : codec == 5 ? 0x98 : 0xC0) * nb_channels;
|
|
st->duration = (size / par->block_align) * 1024LL;
|
|
par->codec_id = AV_CODEC_ID_ATRAC3;
|
|
|
|
ret = ff_alloc_extradata(par, 14);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
AV_WL16(st->codecpar->extradata, 1);
|
|
AV_WL16(st->codecpar->extradata+2, 2048 * nb_channels);
|
|
AV_WL16(st->codecpar->extradata+4, 0);
|
|
AV_WL16(st->codecpar->extradata+6, codec == 4 ? 1 : 0);
|
|
AV_WL16(st->codecpar->extradata+8, codec == 4 ? 1 : 0);
|
|
AV_WL16(st->codecpar->extradata+10, 1);
|
|
AV_WL16(st->codecpar->extradata+12, 0);
|
|
|
|
avpriv_set_pts_info(st, 64, 1, par->sample_rate);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ace_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVCodecParameters *par = s->streams[0]->codecpar;
|
|
|
|
return av_get_packet(s->pb, pkt, par->block_align);
|
|
}
|
|
|
|
const FFInputFormat ff_ace_demuxer = {
|
|
.p.name = "ace",
|
|
.p.long_name = NULL_IF_CONFIG_SMALL("tri-Ace Audio Container"),
|
|
.p.flags = AVFMT_GENERIC_INDEX,
|
|
.read_probe = ace_probe,
|
|
.read_header = ace_read_header,
|
|
.read_packet = ace_read_packet,
|
|
};
|