3
* Copyright (c) 2005 Vidar Madsen
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 "allformats.h"
26
offset_t atrpos, atsqpos, awapos;
30
static int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
32
static int mmf_rate_code(int rate)
35
for(i = 0; i < 5; i++)
36
if(mmf_rates[i] == rate)
41
static int mmf_rate(int code)
43
if((code < 0) || (code > 4))
45
return mmf_rates[code];
49
/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
50
static void end_tag_be(ByteIOContext *pb, offset_t start)
55
url_fseek(pb, start - 4, SEEK_SET);
56
put_be32(pb, (uint32_t)(pos - start));
57
url_fseek(pb, pos, SEEK_SET);
60
static int mmf_write_header(AVFormatContext *s)
62
MMFContext *mmf = s->priv_data;
63
ByteIOContext *pb = &s->pb;
67
rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
69
av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate);
75
pos = start_tag(pb, "CNTI");
76
put_byte(pb, 0); /* class */
77
put_byte(pb, 0); /* type */
78
put_byte(pb, 0); /* code type */
79
put_byte(pb, 0); /* status */
80
put_byte(pb, 0); /* counts */
81
put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */
84
put_buffer(pb, "ATR\x00", 4);
86
mmf->atrpos = url_ftell(pb);
87
put_byte(pb, 0); /* format type */
88
put_byte(pb, 0); /* sequence type */
89
put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
90
put_byte(pb, 0); /* wave base bit */
91
put_byte(pb, 2); /* time base d */
92
put_byte(pb, 2); /* time base g */
96
mmf->atsqpos = url_ftell(pb);
97
/* Will be filled on close */
98
put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
100
mmf->awapos = start_tag(pb, "Awa\x01");
102
av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
104
put_flush_packet(pb);
109
static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
111
ByteIOContext *pb = &s->pb;
112
put_buffer(pb, pkt->data, pkt->size);
116
/* Write a variable-length symbol */
117
static void put_varlength(ByteIOContext *pb, int val)
123
put_byte(pb, 0x80 | val >> 7);
124
put_byte(pb, 0x7f & val);
128
static int mmf_write_trailer(AVFormatContext *s)
130
ByteIOContext *pb = &s->pb;
131
MMFContext *mmf = s->priv_data;
135
if (!url_is_streamed(&s->pb)) {
136
/* Fill in length fields */
137
end_tag_be(pb, mmf->awapos);
138
end_tag_be(pb, mmf->atrpos);
142
size = pos - mmf->awapos;
144
/* Fill Atsq chunk */
145
url_fseek(pb, mmf->atsqpos, SEEK_SET);
148
put_byte(pb, 0); /* start time */
149
put_byte(pb, 1); /* (channel << 6) | wavenum */
150
gatetime = size * 500 / s->streams[0]->codec->sample_rate;
151
put_varlength(pb, gatetime); /* duration */
154
put_varlength(pb, gatetime); /* start time */
155
put_buffer(pb, "\xff\x00", 2); /* nop */
157
/* "end of sequence" */
158
put_buffer(pb, "\x00\x00\x00\x00", 4);
160
url_fseek(pb, pos, SEEK_SET);
162
put_flush_packet(pb);
166
#endif //CONFIG_MUXERS
168
static int mmf_probe(AVProbeData *p)
170
/* check file header */
171
if (p->buf_size <= 32)
173
if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
174
p->buf[2] == 'M' && p->buf[3] == 'D' &&
175
p->buf[8] == 'C' && p->buf[9] == 'N' &&
176
p->buf[10] == 'T' && p->buf[11] == 'I')
177
return AVPROBE_SCORE_MAX;
183
static int mmf_read_header(AVFormatContext *s,
184
AVFormatParameters *ap)
186
MMFContext *mmf = s->priv_data;
188
ByteIOContext *pb = &s->pb;
190
offset_t file_size, size;
194
if (tag != MKTAG('M', 'M', 'M', 'D'))
196
file_size = get_be32(pb);
198
/* Skip some unused chunks that may or may not be present */
199
for(;; url_fseek(pb, size, SEEK_CUR)) {
202
if(tag == MKTAG('C','N','T','I')) continue;
203
if(tag == MKTAG('O','P','D','A')) continue;
207
/* Tag = "ATRx", where "x" = track number */
208
if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
209
av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
212
if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
213
av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
217
get_byte(pb); /* format type */
218
get_byte(pb); /* sequence type */
219
params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */
220
rate = mmf_rate(params & 0x0f);
222
av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
225
get_byte(pb); /* wave base bit */
226
get_byte(pb); /* time base d */
227
get_byte(pb); /* time base g */
229
/* Skip some unused chunks that may or may not be present */
230
for(;; url_fseek(pb, size, SEEK_CUR)) {
233
if(tag == MKTAG('A','t','s','q')) continue;
234
if(tag == MKTAG('A','s','p','I')) continue;
238
/* Make sure it's followed by an Awa chunk, aka wave data */
239
if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
240
av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
243
mmf->data_size = size;
245
st = av_new_stream(s, 0);
247
return AVERROR_NOMEM;
249
st->codec->codec_type = CODEC_TYPE_AUDIO;
250
st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA;
251
st->codec->sample_rate = rate;
252
st->codec->channels = 1;
253
st->codec->bits_per_sample = 4;
254
st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample;
256
av_set_pts_info(st, 64, 1, st->codec->sample_rate);
261
#define MAX_SIZE 4096
263
static int mmf_read_packet(AVFormatContext *s,
266
MMFContext *mmf = s->priv_data;
270
if (url_feof(&s->pb))
275
if(size > mmf->data_size)
276
size = mmf->data_size;
281
if (av_new_packet(pkt, size))
283
pkt->stream_index = 0;
285
ret = get_buffer(&s->pb, pkt->data, pkt->size);
289
mmf->data_size -= ret;
295
static int mmf_read_close(AVFormatContext *s)
300
static int mmf_read_seek(AVFormatContext *s,
301
int stream_index, int64_t timestamp, int flags)
303
return pcm_read_seek(s, stream_index, timestamp, flags);
306
#ifdef CONFIG_MMF_DEMUXER
307
AVInputFormat mmf_demuxer = {
318
#ifdef CONFIG_MMF_MUXER
319
AVOutputFormat mmf_muxer = {
322
"application/vnd.smaf",
325
CODEC_ID_ADPCM_YAMAHA,