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  1. /*
  2.  * Creative Voice File muxer.
  3.  * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #include "voc.h"
  23. #include "internal.h"
  24.  
  25.  
  26. typedef struct voc_enc_context {
  27.     int param_written;
  28. } VocEncContext;
  29.  
  30. static int voc_write_header(AVFormatContext *s)
  31. {
  32.     AVIOContext *pb = s->pb;
  33.     AVCodecContext *enc = s->streams[0]->codec;
  34.     const int header_size = 26;
  35.     const int version = 0x0114;
  36.  
  37.     if (s->nb_streams != 1
  38.         || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
  39.         return AVERROR_PATCHWELCOME;
  40.  
  41.     if (!enc->codec_tag && enc->codec_id != AV_CODEC_ID_PCM_U8) {
  42.         av_log(s, AV_LOG_ERROR, "unsupported codec\n");
  43.         return AVERROR(EINVAL);
  44.     }
  45.  
  46.     avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
  47.     avio_wl16(pb, header_size);
  48.     avio_wl16(pb, version);
  49.     avio_wl16(pb, ~version + 0x1234);
  50.  
  51.     return 0;
  52. }
  53.  
  54. static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
  55. {
  56.     VocEncContext *voc = s->priv_data;
  57.     AVCodecContext *enc = s->streams[0]->codec;
  58.     AVIOContext *pb = s->pb;
  59.  
  60.     if (!voc->param_written) {
  61.         if (enc->codec_tag > 3) {
  62.             avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
  63.             avio_wl24(pb, pkt->size + 12);
  64.             avio_wl32(pb, enc->sample_rate);
  65.             avio_w8(pb, enc->bits_per_coded_sample);
  66.             avio_w8(pb, enc->channels);
  67.             avio_wl16(pb, enc->codec_tag);
  68.             avio_wl32(pb, 0);
  69.         } else {
  70.             if (s->streams[0]->codec->channels > 1) {
  71.                 avio_w8(pb, VOC_TYPE_EXTENDED);
  72.                 avio_wl24(pb, 4);
  73.                 avio_wl16(pb, 65536-(256000000 + enc->sample_rate*enc->channels/2)/(enc->sample_rate*enc->channels));
  74.                 avio_w8(pb, enc->codec_tag);
  75.                 avio_w8(pb, enc->channels - 1);
  76.             }
  77.             avio_w8(pb, VOC_TYPE_VOICE_DATA);
  78.             avio_wl24(pb, pkt->size + 2);
  79.             avio_w8(pb, 256 - (1000000 + enc->sample_rate/2) / enc->sample_rate);
  80.             avio_w8(pb, enc->codec_tag);
  81.         }
  82.         voc->param_written = 1;
  83.     } else {
  84.         avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
  85.         avio_wl24(pb, pkt->size);
  86.     }
  87.  
  88.     avio_write(pb, pkt->data, pkt->size);
  89.     return 0;
  90. }
  91.  
  92. static int voc_write_trailer(AVFormatContext *s)
  93. {
  94.     avio_w8(s->pb, 0);
  95.     return 0;
  96. }
  97.  
  98. AVOutputFormat ff_voc_muxer = {
  99.     .name              = "voc",
  100.     .long_name         = NULL_IF_CONFIG_SMALL("Creative Voice"),
  101.     .mime_type         = "audio/x-voc",
  102.     .extensions        = "voc",
  103.     .priv_data_size    = sizeof(VocEncContext),
  104.     .audio_codec       = AV_CODEC_ID_PCM_S16LE,
  105.     .video_codec       = AV_CODEC_ID_NONE,
  106.     .write_header      = voc_write_header,
  107.     .write_packet      = voc_write_packet,
  108.     .write_trailer     = voc_write_trailer,
  109.     .codec_tag         = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },
  110. };
  111.