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 24 25typedef struct voc_enc_context { 26 int param_written; 27} VocEncContext; 28 29static int voc_write_header(AVFormatContext *s) 30{ 31 ByteIOContext *pb = s->pb; 32 const int header_size = 26; 33 const int version = 0x0114; 34 35 if (s->nb_streams != 1 36 || s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO) 37 return AVERROR_PATCHWELCOME; 38 39 put_buffer(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1); 40 put_le16(pb, header_size); 41 put_le16(pb, version); 42 put_le16(pb, ~version + 0x1234); 43 44 return 0; 45} 46 47static int voc_write_packet(AVFormatContext *s, AVPacket *pkt) 48{ 49 VocEncContext *voc = s->priv_data; 50 AVCodecContext *enc = s->streams[0]->codec; 51 ByteIOContext *pb = s->pb; 52 53 if (!voc->param_written) { 54 if (enc->codec_tag > 0xFF) { 55 put_byte(pb, VOC_TYPE_NEW_VOICE_DATA); 56 put_le24(pb, pkt->size + 12); 57 put_le32(pb, enc->sample_rate); 58 put_byte(pb, enc->bits_per_coded_sample); 59 put_byte(pb, enc->channels); 60 put_le16(pb, enc->codec_tag); 61 put_le32(pb, 0); 62 } else { 63 if (s->streams[0]->codec->channels > 1) { 64 put_byte(pb, VOC_TYPE_EXTENDED); 65 put_le24(pb, 4); 66 put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels)); 67 put_byte(pb, enc->codec_tag); 68 put_byte(pb, enc->channels - 1); 69 } 70 put_byte(pb, VOC_TYPE_VOICE_DATA); 71 put_le24(pb, pkt->size + 2); 72 put_byte(pb, 256 - 1000000 / enc->sample_rate); 73 put_byte(pb, enc->codec_tag); 74 } 75 voc->param_written = 1; 76 } else { 77 put_byte(pb, VOC_TYPE_VOICE_DATA_CONT); 78 put_le24(pb, pkt->size); 79 } 80 81 put_buffer(pb, pkt->data, pkt->size); 82 return 0; 83} 84 85static int voc_write_trailer(AVFormatContext *s) 86{ 87 put_byte(s->pb, 0); 88 return 0; 89} 90 91AVOutputFormat voc_muxer = { 92 "voc", 93 NULL_IF_CONFIG_SMALL("Creative Voice file format"), 94 "audio/x-voc", 95 "voc", 96 sizeof(VocEncContext), 97 CODEC_ID_PCM_U8, 98 CODEC_ID_NONE, 99 voc_write_header, 100 voc_write_packet, 101 voc_write_trailer, 102 .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0}, 103}; 104