sol.c 3.93 KB
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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 (type & SOL_DPCM)
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        return AV_CODEC_ID_SOL_DPCM;

    if (magic == 0x0B8D)
        return AV_CODEC_ID_PCM_U8;

    if (type & SOL_16BIT)
        return AV_CODEC_ID_PCM_S16LE;

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    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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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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    codec = sol_codec_id(magic, type);
    channels = sol_channels(magic, type);
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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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    /* 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 (avio_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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};