141 lines
4.2 KiB
C
141 lines
4.2 KiB
C
/*
|
|
* AIX demuxer
|
|
* Copyright (c) 2016 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 "internal.h"
|
|
|
|
static int aix_probe(const AVProbeData *p)
|
|
{
|
|
if (AV_RL32(p->buf) != MKTAG('A','I','X','F') ||
|
|
AV_RB32(p->buf + 8) != 0x01000014 ||
|
|
AV_RB32(p->buf + 12) != 0x00000800)
|
|
return 0;
|
|
|
|
return AVPROBE_SCORE_MAX;
|
|
}
|
|
|
|
static int aix_read_header(AVFormatContext *s)
|
|
{
|
|
unsigned nb_streams, first_offset, nb_segments;
|
|
unsigned stream_list_offset;
|
|
unsigned segment_list_offset = 0x20;
|
|
unsigned segment_list_entry_size = 0x10;
|
|
unsigned size;
|
|
int i;
|
|
|
|
avio_skip(s->pb, 4);
|
|
first_offset = avio_rb32(s->pb) + 8;
|
|
avio_skip(s->pb, 16);
|
|
nb_segments = avio_rb16(s->pb);
|
|
if (nb_segments == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
stream_list_offset = segment_list_offset + segment_list_entry_size * nb_segments + 0x10;
|
|
if (stream_list_offset >= first_offset)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_seek(s->pb, stream_list_offset, SEEK_SET);
|
|
nb_streams = avio_r8(s->pb);
|
|
if (nb_streams == 0)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(s->pb, 7);
|
|
for (i = 0; i < nb_streams; i++) {
|
|
AVStream *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_ADX;
|
|
st->codecpar->sample_rate = avio_rb32(s->pb);
|
|
st->codecpar->channels = avio_r8(s->pb);
|
|
avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
|
|
avio_skip(s->pb, 3);
|
|
}
|
|
|
|
avio_seek(s->pb, first_offset, SEEK_SET);
|
|
for (i = 0; i < nb_streams; i++) {
|
|
if (avio_rl32(s->pb) != MKTAG('A','I','X','P'))
|
|
return AVERROR_INVALIDDATA;
|
|
size = avio_rb32(s->pb);
|
|
if (size <= 8)
|
|
return AVERROR_INVALIDDATA;
|
|
avio_skip(s->pb, 8);
|
|
ff_get_extradata(s, s->streams[i]->codecpar, s->pb, size - 8);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int aix_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
unsigned size, index, duration, chunk;
|
|
int64_t pos;
|
|
int sequence, ret, i;
|
|
|
|
pos = avio_tell(s->pb);
|
|
if (avio_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
chunk = avio_rl32(s->pb);
|
|
size = avio_rb32(s->pb);
|
|
if (chunk == MKTAG('A','I','X','E')) {
|
|
avio_skip(s->pb, size);
|
|
for (i = 0; i < s->nb_streams; i++) {
|
|
if (avio_feof(s->pb))
|
|
return AVERROR_EOF;
|
|
chunk = avio_rl32(s->pb);
|
|
size = avio_rb32(s->pb);
|
|
avio_skip(s->pb, size);
|
|
}
|
|
pos = avio_tell(s->pb);
|
|
chunk = avio_rl32(s->pb);
|
|
size = avio_rb32(s->pb);
|
|
}
|
|
|
|
if (chunk != MKTAG('A','I','X','P'))
|
|
return AVERROR_INVALIDDATA;
|
|
if (size <= 8)
|
|
return AVERROR_INVALIDDATA;
|
|
index = avio_r8(s->pb);
|
|
if (avio_r8(s->pb) != s->nb_streams || index >= s->nb_streams)
|
|
return AVERROR_INVALIDDATA;
|
|
duration = avio_rb16(s->pb);
|
|
sequence = avio_rb32(s->pb);
|
|
if (sequence < 0) {
|
|
avio_skip(s->pb, size - 8);
|
|
return 0;
|
|
}
|
|
|
|
ret = av_get_packet(s->pb, pkt, size - 8);
|
|
pkt->stream_index = index;
|
|
pkt->duration = duration;
|
|
pkt->pos = pos;
|
|
return ret;
|
|
}
|
|
|
|
AVInputFormat ff_aix_demuxer = {
|
|
.name = "aix",
|
|
.long_name = NULL_IF_CONFIG_SMALL("CRI AIX"),
|
|
.read_probe = aix_probe,
|
|
.read_header = aix_read_header,
|
|
.read_packet = aix_read_packet,
|
|
.extensions = "aix",
|
|
.flags = AVFMT_GENERIC_INDEX,
|
|
};
|