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"
27 static int voc_probe(AVProbeData *p)
31 if (memcmp(p->buf, ff_voc_magic, sizeof(ff_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)
43 VocDecContext *voc = s->priv_data;
44 AVIOContext *pb = s->pb;
49 header_size = avio_rl16(pb) - 22;
50 if (header_size != 4) {
51 av_log(s, AV_LOG_ERROR, "unknown header size: %d\n", header_size);
52 return AVERROR(ENOSYS);
54 avio_skip(pb, header_size);
55 st = avformat_new_stream(s, NULL);
57 return AVERROR(ENOMEM);
58 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
60 voc->remaining_size = 0;
65 ff_voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
67 VocDecContext *voc = s->priv_data;
68 AVCodecContext *dec = st->codec;
69 AVIOContext *pb = s->pb;
71 int size, tmp_codec=-1;
75 while (!voc->remaining_size) {
77 if (type == VOC_TYPE_EOF)
79 voc->remaining_size = avio_rl24(pb);
80 if (!voc->remaining_size) {
83 voc->remaining_size = avio_size(pb) - avio_tell(pb);
88 case VOC_TYPE_VOICE_DATA:
89 if (!dec->sample_rate) {
90 dec->sample_rate = 1000000 / (256 - avio_r8(pb));
92 dec->sample_rate = sample_rate;
93 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
94 dec->channels = channels;
95 dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
98 tmp_codec = avio_r8(pb);
99 voc->remaining_size -= 2;
104 case VOC_TYPE_VOICE_DATA_CONT:
107 case VOC_TYPE_EXTENDED:
108 sample_rate = avio_rl16(pb);
110 channels = avio_r8(pb) + 1;
111 sample_rate = 256000000 / (channels * (65536 - sample_rate));
112 voc->remaining_size = 0;
116 case VOC_TYPE_NEW_VOICE_DATA:
117 if (!dec->sample_rate) {
118 dec->sample_rate = avio_rl32(pb);
119 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
120 dec->bits_per_coded_sample = avio_r8(pb);
121 dec->channels = avio_r8(pb);
124 tmp_codec = avio_rl16(pb);
126 voc->remaining_size -= 12;
131 avio_skip(pb, voc->remaining_size);
132 max_size -= voc->remaining_size;
133 voc->remaining_size = 0;
138 if (tmp_codec >= 0) {
139 tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
140 if (dec->codec_id == AV_CODEC_ID_NONE)
141 dec->codec_id = tmp_codec;
142 else if (dec->codec_id != tmp_codec)
143 av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
144 if (dec->codec_id == AV_CODEC_ID_NONE) {
145 if (s->audio_codec_id == AV_CODEC_ID_NONE) {
146 av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
147 return AVERROR(EINVAL);
149 av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
153 dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample;
157 size = FFMIN(voc->remaining_size, max_size);
158 voc->remaining_size -= size;
159 return av_get_packet(pb, pkt, size);
162 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
164 return ff_voc_get_packet(s, pkt, s->streams[0], 0);
167 AVInputFormat ff_voc_demuxer = {
169 .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
170 .priv_data_size = sizeof(VocDecContext),
171 .read_probe = voc_probe,
172 .read_header = voc_read_header,
173 .read_packet = voc_read_packet,
174 .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },