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/* |
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* Sierra SOL demuxer |
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* Copyright Konstantin Shishkov |
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* |
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* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* 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 |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/
|
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/* |
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* Based on documents from Game Audio Player and own research
*/
|
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#include "libavutil/channel_layout.h" |
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#include "libavutil/intreadwrite.h" |
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#include "avformat.h" |
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#include "internal.h" |
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#include "pcm.h" |
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/* if we don't know the size in advance */ |
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#define AU_UNKNOWN_SIZE ((uint32_t)(~0)) |
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static int sol_probe(AVProbeData *p)
{
/* check file header */ |
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uint16_t magic = AV_RL32(p->buf); |
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if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
p->buf[2] == 'S' && p->buf[3] == 'O' &&
p->buf[4] == 'L' && p->buf[5] == 0)
return AVPROBE_SCORE_MAX;
else
return 0;
}
#define SOL_DPCM 1
#define SOL_16BIT 4
#define SOL_STEREO 16
|
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static enum AVCodecID sol_codec_id(int magic, int type) |
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{
if (magic == 0x0B8D)
{ |
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if (type & SOL_DPCM) return AV_CODEC_ID_SOL_DPCM;
else return AV_CODEC_ID_PCM_U8; |
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}
if (type & SOL_DPCM)
{ |
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if (type & SOL_16BIT) return AV_CODEC_ID_SOL_DPCM;
else if (magic == 0x0C8D) return AV_CODEC_ID_SOL_DPCM;
else return AV_CODEC_ID_SOL_DPCM; |
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} |
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if (type & SOL_16BIT) return AV_CODEC_ID_PCM_S16LE;
return AV_CODEC_ID_PCM_U8; |
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}
static int sol_codec_type(int magic, int type)
{
if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
if (type & SOL_DPCM)
{
if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
else return 2;//SOL_DPCM_NEW8;
}
return -1;
}
static int sol_channels(int magic, int type)
{
if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
return 2;
} |
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|
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static int sol_read_header(AVFormatContext *s) |
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{
unsigned int magic,tag; |
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AVIOContext *pb = s->pb; |
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unsigned int id, channels, rate, type; |
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enum AVCodecID codec; |
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AVStream *st;
/* check ".snd" header */ |
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magic = avio_rl16(pb);
tag = avio_rl32(pb); |
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if (tag != MKTAG('S', 'O', 'L', 0))
return -1; |
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rate = avio_rl16(pb);
type = avio_r8(pb); |
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avio_skip(pb, 4); /* size */ |
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if (magic != 0x0B8D) |
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avio_r8(pb); /* newer SOLs contain padding byte */ |
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|
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codec = sol_codec_id(magic, type);
channels = sol_channels(magic, type); |
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|
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if (codec == AV_CODEC_ID_SOL_DPCM) |
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id = sol_codec_type(magic, type);
else id = 0; |
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|
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/* now we are ready: build format streams */ |
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st = avformat_new_stream(s, NULL); |
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if (!st)
return -1; |
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st->codec->codec_type = AVMEDIA_TYPE_AUDIO; |
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st->codec->codec_tag = id;
st->codec->codec_id = codec;
st->codec->channels = channels; |
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st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
AV_CH_LAYOUT_STEREO; |
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st->codec->sample_rate = rate; |
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avpriv_set_pts_info(st, 64, 1, rate); |
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return 0;
}
#define MAX_SIZE 4096
static int sol_read_packet(AVFormatContext *s,
AVPacket *pkt)
{
int ret;
|
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if (url_feof(s->pb)) |
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return AVERROR(EIO); |
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ret= av_get_packet(s->pb, pkt, MAX_SIZE); |
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if (ret < 0)
return ret; |
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT; |
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pkt->stream_index = 0;
return 0;
}
|
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AVInputFormat ff_sol_demuxer = { |
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.name = "sol", |
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.long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"), |
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.read_probe = sol_probe,
.read_header = sol_read_header,
.read_packet = sol_read_packet, |
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.read_seek = ff_pcm_read_seek, |
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}; |