/*
  * RSO muxer
  * Copyright (c) 2001 Fabrice Bellard (original AU code)
  * Copyright (c) 2010 Rafael Carre
  *
  * 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
  */
 
 #include "avformat.h"
 #include "internal.h"
 #include "riff.h"
 #include "rso.h"
 
 static int rso_write_header(AVFormatContext *s)
 {

     AVIOContext  *pb  = s->pb;

     AVCodecContext *enc = s->streams[0]->codec;
 
     if (!enc->codec_tag)
         return AVERROR_INVALIDDATA;
 
     if (enc->channels != 1) {
         av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (!s->pb->seekable) {

         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
         return AVERROR_INVALIDDATA;
     }
 
     /* XXX: find legal sample rates (if any) */
     if (enc->sample_rate >= 1u<<16) {
         av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
         return AVERROR_INVALIDDATA;
     }
 

     if (enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {

         av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
         return AVERROR_PATCHWELCOME;
     }
 
     /* format header */

     avio_wb16(pb, enc->codec_tag);   /* codec ID */
     avio_wb16(pb, 0);                /* data size, will be written at EOF */
     avio_wb16(pb, enc->sample_rate);
     avio_wb16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */

     avio_flush(pb);

 
     return 0;
 }
 
 static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
 {

     avio_write(s->pb, pkt->data, pkt->size);

     return 0;
 }
 
 static int rso_write_trailer(AVFormatContext *s)
 {

     AVIOContext *pb = s->pb;

     int64_t file_size;
     uint16_t coded_file_size;
 

     file_size = avio_tell(pb);

 
     if (file_size < 0)
         return file_size;
 
     if (file_size > 0xffff + RSO_HEADER_SIZE) {
         av_log(s, AV_LOG_WARNING,
                "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
         coded_file_size = 0xffff;
     } else {
         coded_file_size = file_size - RSO_HEADER_SIZE;
     }
 
     /* update file size */

     avio_seek(pb, 2, SEEK_SET);

     avio_wb16(pb, coded_file_size);

     avio_seek(pb, file_size, SEEK_SET);

 
     return 0;
 }
 

 AVOutputFormat ff_rso_muxer = {

     .name           =   "rso",

     .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),

     .extensions     =   "rso",

     .audio_codec    =   AV_CODEC_ID_PCM_U8,
     .video_codec    =   AV_CODEC_ID_NONE,

     .write_header   =   rso_write_header,
     .write_packet   =   rso_write_packet,
     .write_trailer  =   rso_write_trailer,
     .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
 };