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
voc_write_header(AVFormatContext *s)30 static int voc_write_header(AVFormatContext *s)
31 {
32 AVIOContext *pb = s->pb;
33 AVCodecParameters *par = s->streams[0]->codecpar;
34 const int header_size = 26;
35 const int version = 0x0114;
36
37 if (s->nb_streams != 1
38 || s->streams[0]->codecpar->codec_type != AVMEDIA_TYPE_AUDIO)
39 return AVERROR_PATCHWELCOME;
40
41 if (!par->codec_tag && par->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
voc_write_packet(AVFormatContext *s, AVPacket *pkt)54 static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
55 {
56 VocEncContext *voc = s->priv_data;
57 AVCodecParameters *par = s->streams[0]->codecpar;
58 AVIOContext *pb = s->pb;
59
60 if (!voc->param_written) {
61 if (par->codec_tag > 3) {
62 avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
63 avio_wl24(pb, pkt->size + 12);
64 avio_wl32(pb, par->sample_rate);
65 avio_w8(pb, par->bits_per_coded_sample);
66 avio_w8(pb, par->ch_layout.nb_channels);
67 avio_wl16(pb, par->codec_tag);
68 avio_wl32(pb, 0);
69 } else {
70 if (s->streams[0]->codecpar->ch_layout.nb_channels > 1) {
71 avio_w8(pb, VOC_TYPE_EXTENDED);
72 avio_wl24(pb, 4);
73 avio_wl16(pb, 65536 - (256000000 + par->sample_rate * par->ch_layout.nb_channels / 2) /
74 (par->sample_rate * par->ch_layout.nb_channels));
75 avio_w8(pb, par->codec_tag);
76 avio_w8(pb, par->ch_layout.nb_channels - 1);
77 }
78 avio_w8(pb, VOC_TYPE_VOICE_DATA);
79 avio_wl24(pb, pkt->size + 2);
80 avio_w8(pb, 256 - (1000000 + par->sample_rate/2) / par->sample_rate);
81 avio_w8(pb, par->codec_tag);
82 }
83 voc->param_written = 1;
84 } else {
85 avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
86 avio_wl24(pb, pkt->size);
87 }
88
89 avio_write(pb, pkt->data, pkt->size);
90 return 0;
91 }
92
voc_write_trailer(AVFormatContext *s)93 static int voc_write_trailer(AVFormatContext *s)
94 {
95 avio_w8(s->pb, 0);
96 return 0;
97 }
98
99 const AVOutputFormat ff_voc_muxer = {
100 .name = "voc",
101 .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
102 .mime_type = "audio/x-voc",
103 .extensions = "voc",
104 .priv_data_size = sizeof(VocEncContext),
105 .audio_codec = AV_CODEC_ID_PCM_S16LE,
106 .video_codec = AV_CODEC_ID_NONE,
107 .write_header = voc_write_header,
108 .write_packet = voc_write_packet,
109 .write_trailer = voc_write_trailer,
110 .codec_tag = ff_voc_codec_tags_list,
111 .flags = AVFMT_NOTIMESTAMPS,
112 };
113