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
23 #include "riff.h" /* for CodecTag */
27 typedef enum voc_type {
29 VOC_TYPE_VOICE_DATA = 0x01,
30 VOC_TYPE_VOICE_DATA_CONT = 0x02,
31 VOC_TYPE_SILENCE = 0x03,
32 VOC_TYPE_MARKER = 0x04,
33 VOC_TYPE_ASCII = 0x05,
34 VOC_TYPE_REPETITION_START = 0x06,
35 VOC_TYPE_REPETITION_END = 0x07,
36 VOC_TYPE_EXTENDED = 0x08,
37 VOC_TYPE_NEW_VOICE_DATA = 0x09,
41 static const int voc_max_pkt_size = 2048;
42 static const unsigned char voc_magic[] = "Creative Voice File\x1A";
44 static const CodecTag voc_codec_tags[] = {
45 {CODEC_ID_PCM_U8, 0x00},
46 {CODEC_ID_ADPCM_SBPRO_4, 0x01},
47 {CODEC_ID_ADPCM_SBPRO_3, 0x02},
48 {CODEC_ID_ADPCM_SBPRO_2, 0x03},
49 {CODEC_ID_PCM_S16LE, 0x04},
50 {CODEC_ID_PCM_ALAW, 0x06},
51 {CODEC_ID_PCM_MULAW, 0x07},
52 {CODEC_ID_ADPCM_CT, 0x0200},
57 #ifdef CONFIG_DEMUXERS
59 static int voc_probe(AVProbeData *p)
65 if (memcmp(p->buf, voc_magic, sizeof(voc_magic) - 1))
67 version = p->buf[22] | (p->buf[23] << 8);
68 check = p->buf[24] | (p->buf[25] << 8);
69 if (~version + 0x1234 != check)
72 return AVPROBE_SCORE_MAX;
75 static int voc_read_header(AVFormatContext *s, AVFormatParameters *ap)
77 voc_dec_context_t *voc = s->priv_data;
78 ByteIOContext *pb = &s->pb;
83 header_size = get_le16(pb) - 22;
84 if (header_size != 4) {
85 av_log(s, AV_LOG_ERROR, "unkown header size: %d\n", header_size);
86 return AVERROR_NOTSUPP;
88 url_fskip(pb, header_size);
89 st = av_new_stream(s, 0);
92 st->codec->codec_type = CODEC_TYPE_AUDIO;
94 voc->remaining_size = 0;
99 voc_get_packet(AVFormatContext *s, AVPacket *pkt, AVStream *st, int max_size)
101 voc_dec_context_t *voc = s->priv_data;
102 AVCodecContext *dec = st->codec;
103 ByteIOContext *pb = &s->pb;
109 while (!voc->remaining_size) {
111 if (type == VOC_TYPE_EOF)
113 voc->remaining_size = get_le24(pb);
117 case VOC_TYPE_VOICE_DATA:
118 dec->sample_rate = 1000000 / (256 - get_byte(pb));
120 dec->sample_rate = sample_rate;
121 dec->channels = channels;
122 dec->codec_id = codec_get_id(voc_codec_tags, get_byte(pb));
123 dec->bits_per_sample = av_get_bits_per_sample(dec->codec_id);
124 voc->remaining_size -= 2;
129 case VOC_TYPE_VOICE_DATA_CONT:
132 case VOC_TYPE_EXTENDED:
133 sample_rate = get_le16(pb);
135 channels = get_byte(pb) + 1;
136 sample_rate = 256000000 / (channels * (65536 - sample_rate));
137 voc->remaining_size = 0;
141 case VOC_TYPE_NEW_VOICE_DATA:
142 dec->sample_rate = get_le32(pb);
143 dec->bits_per_sample = get_byte(pb);
144 dec->channels = get_byte(pb);
145 dec->codec_id = codec_get_id(voc_codec_tags, get_le16(pb));
147 voc->remaining_size -= 12;
152 url_fskip(pb, voc->remaining_size);
153 max_size -= voc->remaining_size;
154 voc->remaining_size = 0;
159 dec->bit_rate = dec->sample_rate * dec->bits_per_sample;
162 max_size = voc_max_pkt_size;
163 size = FFMIN(voc->remaining_size, max_size);
164 voc->remaining_size -= size;
165 return av_get_packet(pb, pkt, size);
168 static int voc_read_packet(AVFormatContext *s, AVPacket *pkt)
170 return voc_get_packet(s, pkt, s->streams[0], 0);
173 static int voc_read_close(AVFormatContext *s)
178 AVInputFormat voc_demuxer = {
180 "Creative Voice File format",
181 sizeof(voc_dec_context_t),
188 #endif /* CONFIG_DEMUXERS */
193 typedef struct voc_enc_context {
197 static int voc_write_header(AVFormatContext *s)
199 ByteIOContext *pb = &s->pb;
200 const int header_size = 26;
201 const int version = 0x0114;
203 if (s->nb_streams != 1
204 || s->streams[0]->codec->codec_type != CODEC_TYPE_AUDIO)
205 return AVERROR_NOTSUPP;
207 put_buffer(pb, voc_magic, sizeof(voc_magic) - 1);
208 put_le16(pb, header_size);
209 put_le16(pb, version);
210 put_le16(pb, ~version + 0x1234);
215 static int voc_write_packet(AVFormatContext *s, AVPacket *pkt)
217 voc_enc_context_t *voc = s->priv_data;
218 AVCodecContext *enc = s->streams[0]->codec;
219 ByteIOContext *pb = &s->pb;
221 if (!voc->param_written) {
222 int format = codec_get_tag(voc_codec_tags, enc->codec_id);
225 put_byte(pb, VOC_TYPE_NEW_VOICE_DATA);
226 put_le24(pb, pkt->size + 12);
227 put_le32(pb, enc->sample_rate);
228 put_byte(pb, enc->bits_per_sample);
229 put_byte(pb, enc->channels);
230 put_le16(pb, format);
233 if (s->streams[0]->codec->channels > 1) {
234 put_byte(pb, VOC_TYPE_EXTENDED);
236 put_le16(pb, 65536-256000000/(enc->sample_rate*enc->channels));
237 put_byte(pb, format);
238 put_byte(pb, enc->channels - 1);
240 put_byte(pb, VOC_TYPE_VOICE_DATA);
241 put_le24(pb, pkt->size + 2);
242 put_byte(pb, 256 - 1000000 / enc->sample_rate);
243 put_byte(pb, format);
245 voc->param_written = 1;
247 put_byte(pb, VOC_TYPE_VOICE_DATA_CONT);
248 put_le24(pb, pkt->size);
251 put_buffer(pb, pkt->data, pkt->size);
255 static int voc_write_trailer(AVFormatContext *s)
261 AVOutputFormat voc_muxer = {
263 "Creative Voice File format",
266 sizeof(voc_enc_context_t),
274 #endif /* CONFIG_MUXERS */