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;
77 av_add_index_entry(st,
84 while (!voc->remaining_size) {
86 if (type == VOC_TYPE_EOF)
88 voc->remaining_size = avio_rl24(pb);
89 if (!voc->remaining_size) {
92 voc->remaining_size = avio_size(pb) - avio_tell(pb);
97 case VOC_TYPE_VOICE_DATA:
98 if (!dec->sample_rate) {
99 dec->sample_rate = 1000000 / (256 - avio_r8(pb));
101 dec->sample_rate = sample_rate;
102 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
103 dec->channels = channels;
104 dec->bits_per_coded_sample = av_get_bits_per_sample(dec->codec_id);
107 tmp_codec = avio_r8(pb);
108 voc->remaining_size -= 2;
113 case VOC_TYPE_VOICE_DATA_CONT:
116 case VOC_TYPE_EXTENDED:
117 sample_rate = avio_rl16(pb);
119 channels = avio_r8(pb) + 1;
120 sample_rate = 256000000 / (channels * (65536 - sample_rate));
121 voc->remaining_size = 0;
125 case VOC_TYPE_NEW_VOICE_DATA:
126 if (!dec->sample_rate) {
127 dec->sample_rate = avio_rl32(pb);
128 avpriv_set_pts_info(st, 64, 1, dec->sample_rate);
129 dec->bits_per_coded_sample = avio_r8(pb);
130 dec->channels = avio_r8(pb);
133 tmp_codec = avio_rl16(pb);
135 voc->remaining_size -= 12;
140 avio_skip(pb, voc->remaining_size);
141 max_size -= voc->remaining_size;
142 voc->remaining_size = 0;
147 if (tmp_codec >= 0) {
148 tmp_codec = ff_codec_get_id(ff_voc_codec_tags, tmp_codec);
149 if (dec->codec_id == AV_CODEC_ID_NONE)
150 dec->codec_id = tmp_codec;
151 else if (dec->codec_id != tmp_codec)
152 av_log(s, AV_LOG_WARNING, "Ignoring mid-stream change in audio codec\n");
153 if (dec->codec_id == AV_CODEC_ID_NONE) {
154 if (s->audio_codec_id == AV_CODEC_ID_NONE) {
155 av_log(s, AV_LOG_ERROR, "unknown codec tag\n");
156 return AVERROR(EINVAL);
158 av_log(s, AV_LOG_WARNING, "unknown codec tag\n");
162 dec->bit_rate = dec->sample_rate * dec->channels * dec->bits_per_coded_sample;
166 size = FFMIN(voc->remaining_size, max_size);
167 voc->remaining_size -= size;
169 ret = av_get_packet(pb, pkt, size);
170 pkt->dts = pkt->pts = voc->pts;
172 duration = av_get_audio_frame_duration(st->codec, size);
173 if (duration > 0 && voc->pts != AV_NOPTS_VALUE)
174 voc->pts += duration;
176 voc->pts = AV_NOPTS_VALUE;
181 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
183 return ff_voc_get_packet(s, pkt, s->streams[0], 0);
186 static int voc_read_seek(AVFormatContext *s, int stream_index,
187 int64_t timestamp, int flags)
189 VocDecContext *voc = s->priv_data;
190 AVStream *st = s->streams[stream_index];
191 int index = av_index_search_timestamp(st, timestamp, flags);
193 if (index >= 0 && index < st->nb_index_entries - 1) {
194 AVIndexEntry *e = &st->index_entries[index];
195 avio_seek(s->pb, e->pos, SEEK_SET);
196 voc->pts = e->timestamp;
197 voc->remaining_size = e->size;
199 } else if (st->nb_index_entries && st->index_entries[0].timestamp <= timestamp) {
200 AVIndexEntry *e = &st->index_entries[st->nb_index_entries - 1];
201 // prepare context for seek_frame_generic()
202 voc->pts = e->timestamp;
203 voc->remaining_size = e->size;
208 AVInputFormat ff_voc_demuxer = {
210 .long_name = NULL_IF_CONFIG_SMALL("Creative Voice"),
211 .priv_data_size = sizeof(VocDecContext),
212 .read_probe = voc_probe,
213 .read_header = voc_read_header,
214 .read_packet = voc_read_packet,
215 .read_seek = voc_read_seek,
216 .codec_tag = (const AVCodecTag* const []){ ff_voc_codec_tags, 0 },