yading@11: /*
yading@11:  * Sierra SOL demuxer
yading@11:  * Copyright Konstantin Shishkov
yading@11:  *
yading@11:  * This file is part of FFmpeg.
yading@11:  *
yading@11:  * FFmpeg is free software; you can redistribute it and/or
yading@11:  * modify it under the terms of the GNU Lesser General Public
yading@11:  * License as published by the Free Software Foundation; either
yading@11:  * version 2.1 of the License, or (at your option) any later version.
yading@11:  *
yading@11:  * FFmpeg is distributed in the hope that it will be useful,
yading@11:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@11:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@11:  * Lesser General Public License for more details.
yading@11:  *
yading@11:  * You should have received a copy of the GNU Lesser General Public
yading@11:  * License along with FFmpeg; if not, write to the Free Software
yading@11:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@11:  */
yading@11: 
yading@11: /*
yading@11:  * Based on documents from Game Audio Player and own research
yading@11:  */
yading@11: 
yading@11: #include "libavutil/channel_layout.h"
yading@11: #include "libavutil/intreadwrite.h"
yading@11: #include "avformat.h"
yading@11: #include "internal.h"
yading@11: #include "pcm.h"
yading@11: 
yading@11: /* if we don't know the size in advance */
yading@11: #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
yading@11: 
yading@11: static int sol_probe(AVProbeData *p)
yading@11: {
yading@11:     /* check file header */
yading@11:     uint16_t magic = AV_RL32(p->buf);
yading@11:     if ((magic == 0x0B8D || magic == 0x0C0D || magic == 0x0C8D) &&
yading@11:         p->buf[2] == 'S' && p->buf[3] == 'O' &&
yading@11:         p->buf[4] == 'L' && p->buf[5] == 0)
yading@11:         return AVPROBE_SCORE_MAX;
yading@11:     else
yading@11:         return 0;
yading@11: }
yading@11: 
yading@11: #define SOL_DPCM    1
yading@11: #define SOL_16BIT   4
yading@11: #define SOL_STEREO 16
yading@11: 
yading@11: static enum AVCodecID sol_codec_id(int magic, int type)
yading@11: {
yading@11:     if (magic == 0x0B8D)
yading@11:     {
yading@11:         if (type & SOL_DPCM) return AV_CODEC_ID_SOL_DPCM;
yading@11:         else return AV_CODEC_ID_PCM_U8;
yading@11:     }
yading@11:     if (type & SOL_DPCM)
yading@11:     {
yading@11:         if (type & SOL_16BIT) return AV_CODEC_ID_SOL_DPCM;
yading@11:         else if (magic == 0x0C8D) return AV_CODEC_ID_SOL_DPCM;
yading@11:         else return AV_CODEC_ID_SOL_DPCM;
yading@11:     }
yading@11:     if (type & SOL_16BIT) return AV_CODEC_ID_PCM_S16LE;
yading@11:     return AV_CODEC_ID_PCM_U8;
yading@11: }
yading@11: 
yading@11: static int sol_codec_type(int magic, int type)
yading@11: {
yading@11:     if (magic == 0x0B8D) return 1;//SOL_DPCM_OLD;
yading@11:     if (type & SOL_DPCM)
yading@11:     {
yading@11:         if (type & SOL_16BIT) return 3;//SOL_DPCM_NEW16;
yading@11:         else if (magic == 0x0C8D) return 1;//SOL_DPCM_OLD;
yading@11:         else return 2;//SOL_DPCM_NEW8;
yading@11:     }
yading@11:     return -1;
yading@11: }
yading@11: 
yading@11: static int sol_channels(int magic, int type)
yading@11: {
yading@11:     if (magic == 0x0B8D || !(type & SOL_STEREO)) return 1;
yading@11:     return 2;
yading@11: }
yading@11: 
yading@11: static int sol_read_header(AVFormatContext *s)
yading@11: {
yading@11:     unsigned int magic,tag;
yading@11:     AVIOContext *pb = s->pb;
yading@11:     unsigned int id, channels, rate, type;
yading@11:     enum AVCodecID codec;
yading@11:     AVStream *st;
yading@11: 
yading@11:     /* check ".snd" header */
yading@11:     magic = avio_rl16(pb);
yading@11:     tag = avio_rl32(pb);
yading@11:     if (tag != MKTAG('S', 'O', 'L', 0))
yading@11:         return -1;
yading@11:     rate = avio_rl16(pb);
yading@11:     type = avio_r8(pb);
yading@11:     avio_skip(pb, 4); /* size */
yading@11:     if (magic != 0x0B8D)
yading@11:         avio_r8(pb); /* newer SOLs contain padding byte */
yading@11: 
yading@11:     codec = sol_codec_id(magic, type);
yading@11:     channels = sol_channels(magic, type);
yading@11: 
yading@11:     if (codec == AV_CODEC_ID_SOL_DPCM)
yading@11:         id = sol_codec_type(magic, type);
yading@11:     else id = 0;
yading@11: 
yading@11:     /* now we are ready: build format streams */
yading@11:     st = avformat_new_stream(s, NULL);
yading@11:     if (!st)
yading@11:         return -1;
yading@11:     st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
yading@11:     st->codec->codec_tag = id;
yading@11:     st->codec->codec_id = codec;
yading@11:     st->codec->channels = channels;
yading@11:     st->codec->channel_layout = channels == 1 ? AV_CH_LAYOUT_MONO :
yading@11:                                                 AV_CH_LAYOUT_STEREO;
yading@11:     st->codec->sample_rate = rate;
yading@11:     avpriv_set_pts_info(st, 64, 1, rate);
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: #define MAX_SIZE 4096
yading@11: 
yading@11: static int sol_read_packet(AVFormatContext *s,
yading@11:                           AVPacket *pkt)
yading@11: {
yading@11:     int ret;
yading@11: 
yading@11:     if (url_feof(s->pb))
yading@11:         return AVERROR(EIO);
yading@11:     ret= av_get_packet(s->pb, pkt, MAX_SIZE);
yading@11:     if (ret < 0)
yading@11:         return ret;
yading@11:     pkt->flags &= ~AV_PKT_FLAG_CORRUPT;
yading@11:     pkt->stream_index = 0;
yading@11:     return 0;
yading@11: }
yading@11: 
yading@11: AVInputFormat ff_sol_demuxer = {
yading@11:     .name           = "sol",
yading@11:     .long_name      = NULL_IF_CONFIG_SMALL("Sierra SOL"),
yading@11:     .read_probe     = sol_probe,
yading@11:     .read_header    = sol_read_header,
yading@11:     .read_packet    = sol_read_packet,
yading@11:     .read_seek      = ff_pcm_read_seek,
yading@11: };