2005-12-17 19:14:38 +01:00
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/*
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2006-10-23 10:57:54 +02:00
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* Sierra SOL demuxer
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2009-01-19 16:46:40 +01:00
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* Copyright Konstantin Shishkov
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2004-09-28 05:09:49 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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2004-09-28 05:09:49 +02:00
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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2006-10-07 17:30:46 +02:00
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* version 2.1 of the License, or (at your option) any later version.
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2004-09-28 05:09:49 +02:00
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*
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2006-10-07 17:30:46 +02:00
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* FFmpeg is distributed in the hope that it will be useful,
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2004-09-28 05:09:49 +02:00
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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2006-10-07 17:30:46 +02:00
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* License along with FFmpeg; if not, write to the Free Software
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2006-01-12 23:43:26 +01:00
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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2004-09-28 05:09:49 +02:00
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*/
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2005-12-17 19:14:38 +01:00
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/*
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2004-09-28 05:09:49 +02:00
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* Based on documents from Game Audio Player and own research
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*/
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2012-04-08 00:38:29 +02:00
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#include "libavutil/channel_layout.h"
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2011-11-26 01:22:28 +01:00
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#include "libavutil/intreadwrite.h"
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2004-09-28 05:09:49 +02:00
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#include "avformat.h"
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2011-11-29 19:28:15 +01:00
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#include "internal.h"
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2010-08-30 23:17:34 +02:00
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#include "pcm.h"
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2004-09-28 05:09:49 +02:00
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/* if we don't know the size in advance */
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2007-03-07 01:49:49 +01:00
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#define AU_UNKNOWN_SIZE ((uint32_t)(~0))
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2004-09-28 05:09:49 +02:00
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2019-03-21 01:18:37 +01:00
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static int sol_probe(const AVProbeData *p)
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2004-09-28 05:09:49 +02:00
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{
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/* check file header */
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2011-11-26 01:22:28 +01:00
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uint16_t magic = AV_RL32(p->buf);
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2004-09-28 05:09:49 +02:00
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if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
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p->buf[2] == 'S' && p->buf[3] == 'O' &&
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p->buf[4] == 'L' && p->buf[5] == 0)
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return AVPROBE_SCORE_MAX;
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else
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return 0;
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}
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#define SOL_DPCM 1
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#define SOL_16BIT 4
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#define SOL_STEREO 16
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2012-08-05 11:11:04 +02:00
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static enum AVCodecID sol_codec_id(int magic, int type)
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2004-09-28 05:09:49 +02:00
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{
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if (type & SOL_DPCM)
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2014-11-21 13:57:35 +01:00
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return AV_CODEC_ID_SOL_DPCM;
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if (magic == 0x0B8D)
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return AV_CODEC_ID_PCM_U8;
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if (type & SOL_16BIT)
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return AV_CODEC_ID_PCM_S16LE;
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2012-08-05 11:11:04 +02:00
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return AV_CODEC_ID_PCM_U8;
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2004-09-28 05:09:49 +02:00
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}
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static int sol_codec_type(int magic, int type)
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{
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if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
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if (type & SOL_DPCM)
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{
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if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
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else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
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else return 2;//SOL_DPCM_NEW8;
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}
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return -1;
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}
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static int sol_channels(int magic, int type)
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{
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if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
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return 2;
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}
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2005-12-17 19:14:38 +01:00
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2012-01-12 13:20:36 +01:00
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static int sol_read_header(AVFormatContext *s)
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2004-09-28 05:09:49 +02:00
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{
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unsigned int magic,tag;
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2011-02-20 11:04:12 +01:00
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AVIOContext *pb = s->pb;
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2008-10-02 18:03:00 +02:00
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unsigned int id, channels, rate, type;
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2012-08-05 11:11:04 +02:00
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enum AVCodecID codec;
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2004-09-28 05:09:49 +02:00
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AVStream *st;
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/* check ".snd" header */
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2011-02-21 16:43:01 +01:00
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magic = avio_rl16(pb);
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tag = avio_rl32(pb);
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2004-09-28 05:09:49 +02:00
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if (tag != MKTAG('S', 'O', 'L', 0))
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return -1;
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2011-02-21 16:43:01 +01:00
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rate = avio_rl16(pb);
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type = avio_r8(pb);
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2011-06-01 18:26:27 +02:00
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avio_skip(pb, 4); /* size */
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2004-09-28 05:09:49 +02:00
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if (magic != 0x0B8D)
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2011-02-21 16:43:01 +01:00
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avio_r8(pb); /* newer SOLs contain padding byte */
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2005-12-17 19:14:38 +01:00
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2004-09-28 05:09:49 +02:00
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codec = sol_codec_id(magic, type);
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channels = sol_channels(magic, type);
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2005-12-17 19:14:38 +01:00
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2012-08-05 11:11:04 +02:00
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if (codec == AV_CODEC_ID_SOL_DPCM)
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2004-09-28 05:09:49 +02:00
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id = sol_codec_type(magic, type);
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else id = 0;
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2005-12-17 19:14:38 +01:00
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2004-09-28 05:09:49 +02:00
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/* now we are ready: build format streams */
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2011-06-18 11:43:24 +02:00
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st = avformat_new_stream(s, NULL);
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2004-09-28 05:09:49 +02:00
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if (!st)
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return -1;
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lavf: replace AVStream.codec with AVStream.codecpar
Currently, AVStream contains an embedded AVCodecContext instance, which
is used by demuxers to export stream parameters to the caller and by
muxers to receive stream parameters from the caller. It is also used
internally as the codec context that is passed to parsers.
In addition, it is also widely used by the callers as the decoding (when
demuxer) or encoding (when muxing) context, though this has been
officially discouraged since Libav 11.
There are multiple important problems with this approach:
- the fields in AVCodecContext are in general one of
* stream parameters
* codec options
* codec state
However, it's not clear which ones are which. It is consequently
unclear which fields are a demuxer allowed to set or a muxer allowed to
read. This leads to erratic behaviour depending on whether decoding or
encoding is being performed or not (and whether it uses the AVStream
embedded codec context).
- various synchronization issues arising from the fact that the same
context is used by several different APIs (muxers/demuxers,
parsers, bitstream filters and encoders/decoders) simultaneously, with
there being no clear rules for who can modify what and the different
processes being typically delayed with respect to each other.
- avformat_find_stream_info() making it necessary to support opening
and closing a single codec context multiple times, thus
complicating the semantics of freeing various allocated objects in the
codec context.
Those problems are resolved by replacing the AVStream embedded codec
context with a newly added AVCodecParameters instance, which stores only
the stream parameters exported by the demuxers or read by the muxers.
2014-06-18 20:42:52 +02:00
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st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
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st->codecpar->codec_tag = id;
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st->codecpar->codec_id = codec;
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st->codecpar->channels = channels;
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st->codecpar->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
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AV_CH_LAYOUT_STEREO;
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st->codecpar->sample_rate = rate;
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2011-11-29 19:28:15 +01:00
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avpriv_set_pts_info(st, 64, 1, rate);
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2004-09-28 05:09:49 +02:00
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return 0;
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}
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#define MAX_SIZE 4096
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static int sol_read_packet(AVFormatContext *s,
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AVPacket *pkt)
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{
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int ret;
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2014-08-07 22:12:41 +02:00
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if (avio_feof(s->pb))
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2007-02-13 19:26:14 +01:00
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return AVERROR(EIO);
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2007-11-21 08:41:00 +01:00
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ret= av_get_packet(s->pb, pkt, MAX_SIZE);
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2011-09-24 03:43:43 +02:00
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if (ret < 0)
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return ret;
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2012-04-30 22:58:27 +02:00
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pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
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2004-09-28 05:09:49 +02:00
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pkt->stream_index = 0;
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return 0;
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}
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2011-01-25 23:03:28 +01:00
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AVInputFormat ff_sol_demuxer = {
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2011-07-16 22:18:12 +02:00
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.name = "sol",
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2012-07-24 23:51:41 +02:00
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.long_name = NULL_IF_CONFIG_SMALL("Sierra SOL"),
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2011-07-16 22:18:12 +02:00
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.read_probe = sol_probe,
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.read_header = sol_read_header,
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.read_packet = sol_read_packet,
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2012-02-15 10:28:39 +01:00
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.read_seek = ff_pcm_read_seek,
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2004-09-28 05:09:49 +02:00
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};
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