2 * Creative Voice File demuxer.
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 static const int voc_max_pkt_size = 2048;
28 static int voc_probe(AVProbeData *p)
34 if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
36 version = p->buf[22] | (p->buf[23] << 8);
37 check = p->buf[24] | (p->buf[25] << 8);
38 if (~version + 0x1234 != check)
41 return AVPROBE_SCORE_MAX;
44 static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
46 voc_dec_context_t *voc = s->priv_data;
47 ByteIOContext *pb = &s->pb;
52 header_size = get_le16(pb) - 22;
53 if (header_size != 4) {
54 av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
55 return AVERROR_NOTSUPP;
57 url_fskip(pb, header_size);
58 st = av_new_stream(s, 0);
61 st->codec->codec_type = CODEC_TYPE_AUDIO;
63 voc->remaining_size = 0;
68 voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
70 voc_dec_context_t *voc = s->priv_data;
71 AVCodecContext *dec = st->codec;
72 ByteIOContext *pb = &s->pb;
78 while (!voc->remaining_size) {
80 if (type == VOC_TYPE_EOF)
82 voc->remaining_size = get_le24(pb);
86 case VOC_TYPE_VOICE_DATA:
87 dec->sample_rate = 1000000 / (256 - get_byte(pb));
89 dec->sample_rate = sample_rate;
90 dec->channels = channels;
91 dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
92 dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
93 voc->remaining_size -= 2;
98 case VOC_TYPE_VOICE_DATA_CONT:
101 case VOC_TYPE_EXTENDED:
102 sample_rate = get_le16(pb);
104 channels = get_byte(pb) + 1;
105 sample_rate = 256000000 / (channels * (65536 - sample_rate));
106 voc->remaining_size = 0;
110 case VOC_TYPE_NEW_VOICE_DATA:
111 dec->sample_rate = get_le32(pb);
112 dec->bits_per_sample = get_byte(pb);
113 dec->channels = get_byte(pb);
114 dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
116 voc->remaining_size -= 12;
121 url_fskip(pb, voc->remaining_size);
122 max_size -= voc->remaining_size;
123 voc->remaining_size = 0;
128 dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
131 max_size = voc_max_pkt_size;
132 size = FFMIN(voc->remaining_size, max_size);
133 voc->remaining_size -= size;
134 return av_get_packet(pb, pkt, size);
137 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
139 return voc_get_packet(s, pkt, s->streams[0], 0);
142 static int voc_read_close(AVFormatContext *s)
147 AVInputFormat voc_demuxer = {
149 "Creative Voice File format",
150 sizeof(voc_dec_context_t),
155 .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},