1/*
2 * Creative Voice File muxer.
3 * Copyright (c) 2006  Aurelien Jacobs <aurel@gnuage.org>
4 *
5 * This file is part of Libav.
6 *
7 * Libav 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 * Libav 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 Libav; 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
26typedef struct voc_enc_context {
27    int param_written;
28} VocEncContext;
29
30static int voc_write_header(AVFormatContext *s)
31{
32    AVIOContext *pb = s->pb;
33    const int header_size = 26;
34    const int version = 0x0114;
35
36    if (s->nb_streams != 1
37        || s->streams[0]->codec->codec_type != AVMEDIA_TYPE_AUDIO)
38        return AVERROR_PATCHWELCOME;
39
40    avio_write(pb, ff_voc_magic, sizeof(ff_voc_magic) - 1);
41    avio_wl16(pb, header_size);
42    avio_wl16(pb, version);
43    avio_wl16(pb, ~version + 0x1234);
44
45    return 0;
46}
47
48static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
49{
50    VocEncContext *voc = s->priv_data;
51    AVCodecContext *enc = s->streams[0]->codec;
52    AVIOContext *pb = s->pb;
53
54    if (!voc->param_written) {
55        if (enc->codec_tag > 0xFF) {
56            avio_w8(pb, VOC_TYPE_NEW_VOICE_DATA);
57            avio_wl24(pb, pkt->size + 12);
58            avio_wl32(pb, enc->sample_rate);
59            avio_w8(pb, enc->bits_per_coded_sample);
60            avio_w8(pb, enc->channels);
61            avio_wl16(pb, enc->codec_tag);
62            avio_wl32(pb, 0);
63        } else {
64            if (s->streams[0]->codec->channels > 1) {
65                avio_w8(pb, VOC_TYPE_EXTENDED);
66                avio_wl24(pb, 4);
67                avio_wl16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
68                avio_w8(pb, enc->codec_tag);
69                avio_w8(pb, enc->channels - 1);
70            }
71            avio_w8(pb, VOC_TYPE_VOICE_DATA);
72            avio_wl24(pb, pkt->size + 2);
73            avio_w8(pb, 256 - 1000000 / enc->sample_rate);
74            avio_w8(pb, enc->codec_tag);
75        }
76        voc->param_written = 1;
77    } else {
78        avio_w8(pb, VOC_TYPE_VOICE_DATA_CONT);
79        avio_wl24(pb, pkt->size);
80    }
81
82    avio_write(pb, pkt->data, pkt->size);
83    return 0;
84}
85
86static int voc_write_trailer(AVFormatContext *s)
87{
88    avio_w8(s->pb, 0);
89    return 0;
90}
91
92AVOutputFormat ff_voc_muxer = {
93    .name              = "voc",
94    .long_name         = NULL_IF_CONFIG_SMALL("Creative Voice file format"),
95    .mime_type         = "audio/x-voc",
96    .extensions        = "voc",
97    .priv_data_size    = sizeof(VocEncContext),
98    .audio_codec       = CODEC_ID_PCM_U8,
99    .video_codec       = CODEC_ID_NONE,
100    .write_header      = voc_write_header,
101    .write_packet      = voc_write_packet,
102    .write_trailer     = voc_write_trailer,
103    .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0},
104};
105