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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 | .flags = AVFMT_NOTIMESTAMPS, | |
111 | }; |