/* * Sierra SOL demuxer * Copyright Konstantin Shishkov. * * 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 *//* * Based on documents from Game Audio Player and own research */#include "libavutil/bswap.h"#include "avformat.h"#include "raw.h"/* if we don't know the size in advance */#define AU_UNKNOWN_SIZE ((uint32_t)(~0))static int sol_probe(AVProbeData *p){    /* check file header */    uint16_t magic;    magic=le2me_16(*((uint16_t*)p->buf));    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 16static int sol_codec_id(int magic, int type){    if (magic == 0x0B8D)    {        if (type & SOL_DPCM) return CODEC_ID_SOL_DPCM;        else return CODEC_ID_PCM_U8;    }    if (type & SOL_DPCM)    {        if (type & SOL_16BIT) return CODEC_ID_SOL_DPCM;        else if (magic == 0x0C8D) return CODEC_ID_SOL_DPCM;        else return CODEC_ID_SOL_DPCM;    }    if (type & SOL_16BIT) return CODEC_ID_PCM_S16LE;    return CODEC_ID_PCM_U8;}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;}static int sol_read_header(AVFormatContext *s,                          AVFormatParameters *ap){    int size;    unsigned int magic,tag;    ByteIOContext *pb = s->pb;    unsigned int id, codec, channels, rate, type;    AVStream *st;    /* check ".snd" header */    magic = get_le16(pb);    tag = get_le32(pb);    if (tag != MKTAG('S', 'O', 'L', 0))        return -1;    rate = get_le16(pb);    type = get_byte(pb);    size = get_le32(pb);    if (magic != 0x0B8D)        get_byte(pb); /* newer SOLs contain padding byte */    codec = sol_codec_id(magic, type);    channels = sol_channels(magic, type);    if (codec == CODEC_ID_SOL_DPCM)        id = sol_codec_type(magic, type);    else id = 0;    /* now we are ready: build format streams */    st = av_new_stream(s, 0);    if (!st)        return -1;    st->codec->codec_type = CODEC_TYPE_AUDIO;    st->codec->codec_tag = id;    st->codec->codec_id = codec;    st->codec->channels = channels;    st->codec->sample_rate = rate;    av_set_pts_info(st, 64, 1, rate);    return 0;}#define MAX_SIZE 4096static int sol_read_packet(AVFormatContext *s,                          AVPacket *pkt){    int ret;    if (url_feof(s->pb))        return AVERROR(EIO);    ret= av_get_packet(s->pb, pkt, MAX_SIZE);    pkt->stream_index = 0;    /* note: we need to modify the packet size here to handle the last       packet */    pkt->size = ret;    return 0;}AVInputFormat sol_demuxer = {    "sol",    NULL_IF_CONFIG_SMALL("Sierra SOL format"),    0,    sol_probe,    sol_read_header,    sol_read_packet,    NULL,    pcm_read_seek,};