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
27 static int voc_probe(AVProbeData *p)
31 if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
33 version = AV_RL16(p->buf + 22);
34 check = AV_RL16(p->buf + 24);
35 if (~version + 0x1234 != check)
38 return AVPROBE_SCORE_MAX;
41 static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
43 voc_dec_context_t *voc = s->priv_data;
44 ByteIOContext *pb = &s->pb;
49 header_size = get_le16(pb) - 22;
50 if (header_size != 4) {
51 av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
52 return AVERROR_NOTSUPP;
54 url_fskip(pb, header_size);
55 st = av_new_stream(s, 0);
58 st->codec->codec_type = CODEC_TYPE_AUDIO;
60 voc->remaining_size = 0;
65 voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
67 voc_dec_context_t *voc = s->priv_data;
68 AVCodecContext *dec = st->codec;
69 ByteIOContext *pb = &s->pb;
75 while (!voc->remaining_size) {
77 if (type == VOC_TYPE_EOF)
79 voc->remaining_size = get_le24(pb);
83 case VOC_TYPE_VOICE_DATA:
84 dec->sample_rate = 1000000 / (256 - get_byte(pb));
86 dec->sample_rate = sample_rate;
87 dec->channels = channels;
88 dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
89 dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
90 voc->remaining_size -= 2;
95 case VOC_TYPE_VOICE_DATA_CONT:
98 case VOC_TYPE_EXTENDED:
99 sample_rate = get_le16(pb);
101 channels = get_byte(pb) + 1;
102 sample_rate = 256000000 / (channels * (65536 - sample_rate));
103 voc->remaining_size = 0;
107 case VOC_TYPE_NEW_VOICE_DATA:
108 dec->sample_rate = get_le32(pb);
109 dec->bits_per_sample = get_byte(pb);
110 dec->channels = get_byte(pb);
111 dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
113 voc->remaining_size -= 12;
118 url_fskip(pb, voc->remaining_size);
119 max_size -= voc->remaining_size;
120 voc->remaining_size = 0;
125 dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
129 size = FFMIN(voc->remaining_size, max_size);
130 voc->remaining_size -= size;
131 return av_get_packet(pb, pkt, size);
134 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
136 return voc_get_packet(s, pkt, s->streams[0], 0);
139 static int voc_read_close(AVFormatContext *s)
144 AVInputFormat voc_demuxer = {
146 "Creative Voice File format",
147 sizeof(voc_dec_context_t),
152 .codec_tag=(const AVCodecTag*[]){voc_codec_tags, 0},