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 Street, Fifth Floor, Boston, MA 02110-1301 USA
25 static int voc_probe(AVProbeData *p)
29 if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
31 version = AV_RL16(p->buf + 22);
32 check = AV_RL16(p->buf + 24);
33 if (~version + 0x1234 != check)
36 return AVPROBE_SCORE_MAX;
39 static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
41 voc_dec_context_t *voc = s->priv_data;
42 ByteIOContext *pb = &s->pb;
47 header_size = get_le16(pb) - 22;
48 if (header_size != 4) {
49 av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
50 return AVERROR(ENOSYS);
52 url_fskip(pb, header_size);
53 st = av_new_stream(s, 0);
55 return AVERROR(ENOMEM);
56 st->codec->codec_type = CODEC_TYPE_AUDIO;
58 voc->remaining_size = 0;
63 voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
65 voc_dec_context_t *voc = s->priv_data;
66 AVCodecContext *dec = st->codec;
67 ByteIOContext *pb = &s->pb;
73 while (!voc->remaining_size) {
75 if (type == VOC_TYPE_EOF)
77 voc->remaining_size = get_le24(pb);
81 case VOC_TYPE_VOICE_DATA:
82 dec->sample_rate = 1000000 / (256 - get_byte(pb));
84 dec->sample_rate = sample_rate;
85 dec->channels = channels;
86 dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
87 dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
88 voc->remaining_size -= 2;
93 case VOC_TYPE_VOICE_DATA_CONT:
96 case VOC_TYPE_EXTENDED:
97 sample_rate = get_le16(pb);
99 channels = get_byte(pb) + 1;
100 sample_rate = 256000000 / (channels * (65536 - sample_rate));
101 voc->remaining_size = 0;
105 case VOC_TYPE_NEW_VOICE_DATA:
106 dec->sample_rate = get_le32(pb);
107 dec->bits_per_sample = get_byte(pb);
108 dec->channels = get_byte(pb);
109 dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
111 voc->remaining_size -= 12;
116 url_fskip(pb, voc->remaining_size);
117 max_size -= voc->remaining_size;
118 voc->remaining_size = 0;
123 dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
127 size = FFMIN(voc->remaining_size, max_size);
128 voc->remaining_size -= size;
129 return av_get_packet(pb, pkt, size);
132 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
134 return voc_get_packet(s, pkt, s->streams[0], 0);
137 AVInputFormat voc_demuxer = {
139 "Creative Voice File format",
140 sizeof(voc_dec_context_t),
144 .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},