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
22 #include "libavutil/intreadwrite.h"
26 static int voc_probe(AVProbeData *p)
30 if (memcmp(p->buf, ff_voc_magic, sizeof(ff_voc_magic) - 1))
32 version = AV_RL16(p->buf + 22);
33 check = AV_RL16(p->buf + 24);
34 if (~version + 0x1234 != check)
37 return AVPROBE_SCORE_MAX;
40 static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
42 VocDecContext *voc = s->priv_data;
43 ByteIOContext *pb = s->pb;
48 header_size = get_le16(pb) - 22;
49 if (header_size != 4) {
50 av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
51 return AVERROR(ENOSYS);
53 url_fskip(pb, header_size);
54 st = av_new_stream(s, 0);
56 return AVERROR(ENOMEM);
57 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
59 voc->remaining_size = 0;
64 voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
66 VocDecContext *voc = s->priv_data;
67 AVCodecContext *dec = st->codec;
68 ByteIOContext *pb = s->pb;
74 while (!voc->remaining_size) {
76 if (type == VOC_TYPE_EOF)
78 voc->remaining_size = get_le24(pb);
79 if (!voc->remaining_size) {
80 if (url_is_streamed(s->pb))
82 voc->remaining_size = url_fsize(pb) - url_ftell(pb);
87 case VOC_TYPE_VOICE_DATA:
88 dec->sample_rate = 1000000 / (256 - get_byte(pb));
90 dec->sample_rate = sample_rate;
91 dec->channels = channels;
92 dec->codec_id = ff_codec_get_id(ff_voc_codec_tags, get_byte(pb));
93 dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
94 voc->remaining_size -= 2;
99 case VOC_TYPE_VOICE_DATA_CONT:
102 case VOC_TYPE_EXTENDED:
103 sample_rate = get_le16(pb);
105 channels = get_byte(pb) + 1;
106 sample_rate = 256000000 / (channels * (65536 - sample_rate));
107 voc->remaining_size = 0;
111 case VOC_TYPE_NEW_VOICE_DATA:
112 dec->sample_rate = get_le32(pb);
113 dec->bits_per_coded_sample = get_byte(pb);
114 dec->channels = get_byte(pb);
115 dec->codec_id = ff_codec_get_id(ff_voc_codec_tags, get_le16(pb));
117 voc->remaining_size -= 12;
122 url_fskip(pb, voc->remaining_size);
123 max_size -= voc->remaining_size;
124 voc->remaining_size = 0;
129 dec->bit_rate = dec->sample_rate * dec->bits_per_coded_sample;
133 size = FFMIN(voc->remaining_size, max_size);
134 voc->remaining_size -= size;
135 return av_get_packet(pb, pkt, size);
138 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
140 return voc_get_packet(s, pkt, s->streams[0], 0);
143 AVInputFormat voc_demuxer = {
145 NULL_IF_CONFIG_SMALL("Creative Voice file format"),
146 sizeof(VocDecContext),
150 .codec_tag=(const AVCodecTag* const []){ff_voc_codec_tags, 0},