2 * Creative Voice File muxer.
3 * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
5 * This file is part of FFmpeg.
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.
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.
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 St, Fifth Floor, Boston, MA 02110-1301 USA
25 typedef struct voc_enc_context {
29 static int voc_write_header(AVFormatContext *s)
31 ByteIOContext *pb = &s->pb;
32 const int header_size = 26;
33 const int version = 0x0114;
35 if (s->nb_streams != 1
36 || s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
37 return AVERROR_NOTSUPP;
39 put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
40 put_le16(pb, header_size);
41 put_le16(pb, version);
42 put_le16(pb, ~version + 0x1234);
47 static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
49 voc_enc_context_t *voc = s->priv_data;
50 AVCodecContext *enc = s->streams[0]->codec;
51 ByteIOContext *pb = &s->pb;
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_sample);
59 put_byte(pb, enc->channels);
60 put_le16(pb, enc->codec_tag);
63 if (s->streams[0]->codec->channels > 1) {
64 put_byte(pb, VOC_TYPE_EXTENDED);
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);
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);
75 voc->param_written = 1;
77 put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
78 put_le24(pb, pkt->size);
81 put_buffer(pb, pkt->data, pkt->size);
85 static int voc_write_trailer(AVFormatContext *s)
91 AVOutputFormat voc_muxer = {
93 "Creative Voice File format",
96 sizeof(voc_enc_context_t),
102 .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},