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  1. /*
  2.  * RSO muxer
  3.  * Copyright (c) 2001 Fabrice Bellard (original AU code)
  4.  * Copyright (c) 2010 Rafael Carre
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #include "avformat.h"
  24. #include "internal.h"
  25. #include "riff.h"
  26. #include "rso.h"
  27.  
  28. static int rso_write_header(AVFormatContext *s)
  29. {
  30.     AVIOContext  *pb  = s->pb;
  31.     AVCodecContext *enc = s->streams[0]->codec;
  32.  
  33.     if (!enc->codec_tag)
  34.         return AVERROR_INVALIDDATA;
  35.  
  36.     if (enc->channels != 1) {
  37.         av_log(s, AV_LOG_ERROR, "RSO only supports mono\n");
  38.         return AVERROR_INVALIDDATA;
  39.     }
  40.  
  41.     if (!s->pb->seekable) {
  42.         av_log(s, AV_LOG_ERROR, "muxer does not support non seekable output\n");
  43.         return AVERROR_INVALIDDATA;
  44.     }
  45.  
  46.     /* XXX: find legal sample rates (if any) */
  47.     if (enc->sample_rate >= 1u<<16) {
  48.         av_log(s, AV_LOG_ERROR, "Sample rate must be < 65536\n");
  49.         return AVERROR_INVALIDDATA;
  50.     }
  51.  
  52.     if (enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
  53.         av_log(s, AV_LOG_ERROR, "ADPCM in RSO not implemented\n");
  54.         return AVERROR_PATCHWELCOME;
  55.     }
  56.  
  57.     /* format header */
  58.     avio_wb16(pb, enc->codec_tag);   /* codec ID */
  59.     avio_wb16(pb, 0);                /* data size, will be written at EOF */
  60.     avio_wb16(pb, enc->sample_rate);
  61.     avio_wb16(pb, 0x0000);           /* play mode ? (0x0000 = don't loop) */
  62.  
  63.     avio_flush(pb);
  64.  
  65.     return 0;
  66. }
  67.  
  68. static int rso_write_packet(AVFormatContext *s, AVPacket *pkt)
  69. {
  70.     avio_write(s->pb, pkt->data, pkt->size);
  71.     return 0;
  72. }
  73.  
  74. static int rso_write_trailer(AVFormatContext *s)
  75. {
  76.     AVIOContext *pb = s->pb;
  77.     int64_t file_size;
  78.     uint16_t coded_file_size;
  79.  
  80.     file_size = avio_tell(pb);
  81.  
  82.     if (file_size < 0)
  83.         return file_size;
  84.  
  85.     if (file_size > 0xffff + RSO_HEADER_SIZE) {
  86.         av_log(s, AV_LOG_WARNING,
  87.                "Output file is too big (%"PRId64" bytes >= 64kB)\n", file_size);
  88.         coded_file_size = 0xffff;
  89.     } else {
  90.         coded_file_size = file_size - RSO_HEADER_SIZE;
  91.     }
  92.  
  93.     /* update file size */
  94.     avio_seek(pb, 2, SEEK_SET);
  95.     avio_wb16(pb, coded_file_size);
  96.     avio_seek(pb, file_size, SEEK_SET);
  97.  
  98.     return 0;
  99. }
  100.  
  101. AVOutputFormat ff_rso_muxer = {
  102.     .name           =   "rso",
  103.     .long_name      =   NULL_IF_CONFIG_SMALL("Lego Mindstorms RSO"),
  104.     .extensions     =   "rso",
  105.     .audio_codec    =   AV_CODEC_ID_PCM_U8,
  106.     .video_codec    =   AV_CODEC_ID_NONE,
  107.     .write_header   =   rso_write_header,
  108.     .write_packet   =   rso_write_packet,
  109.     .write_trailer  =   rso_write_trailer,
  110.     .codec_tag      =   (const AVCodecTag* const []){ff_codec_rso_tags, 0},
  111. };
  112.