aboutsummaryrefslogtreecommitdiffstats
path: root/libavformat/mmf.c
blob: 1393627d8abc87b014caf753d458d2c41612c10a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
/*
 * Yamaha SMAF format
 * Copyright (c) 2005 Vidar Madsen
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/channel_layout.h"
#include "avformat.h"
#include "avio_internal.h"
#include "internal.h"
#include "pcm.h"
#include "rawenc.h"
#include "riff.h"

typedef struct MMFContext {
    int64_t atrpos, atsqpos, awapos;
    int64_t data_end;
    int stereo;
} MMFContext;

static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };

static int mmf_rate(int code)
{
    if ((code < 0) || (code > 4))
        return -1;
    return mmf_rates[code];
}

#if CONFIG_MMF_MUXER
static int mmf_rate_code(int rate)
{
    int i;
    for (i = 0; i < 5; i++)
        if (mmf_rates[i] == rate)
            return i;
    return -1;
}

/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
static void end_tag_be(AVIOContext *pb, int64_t start)
{
    int64_t pos;

    pos = avio_tell(pb);
    avio_seek(pb, start - 4, SEEK_SET);
    avio_wb32(pb, (uint32_t)(pos - start));
    avio_seek(pb, pos, SEEK_SET);
}

static int mmf_write_header(AVFormatContext *s)
{
    MMFContext *mmf = s->priv_data;
    AVIOContext *pb = s->pb;
    int64_t pos;
    int rate;
    const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
                          "VN:Lavf," :
                          "VN:"LIBAVFORMAT_IDENT",";

    rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
    if (rate < 0) {
        av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
               s->streams[0]->codecpar->sample_rate);
        return AVERROR(EINVAL);
    }

    mmf->stereo = s->streams[0]->codecpar->channels > 1;
    if (mmf->stereo &&
        s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
        av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
               "add '-strict %d' if you want to use it.\n",
               FF_COMPLIANCE_EXPERIMENTAL);
        return AVERROR(EINVAL);
    }

    ffio_wfourcc(pb, "MMMD");
    avio_wb32(pb, 0);
    pos = ff_start_tag(pb, "CNTI");
    avio_w8(pb, 0); /* class */
    avio_w8(pb, 1); /* type */
    avio_w8(pb, 1); /* code type */
    avio_w8(pb, 0); /* status */
    avio_w8(pb, 0); /* counts */
    end_tag_be(pb, pos);

    pos = ff_start_tag(pb, "OPDA");
    avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
    end_tag_be(pb, pos);

    avio_write(pb, "ATR\x00", 4);
    avio_wb32(pb, 0);
    mmf->atrpos = avio_tell(pb);
    avio_w8(pb, 0); /* format type */
    avio_w8(pb, 0); /* sequence type */
    avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
    avio_w8(pb, 0); /* wave base bit */
    avio_w8(pb, 2); /* time base d */
    avio_w8(pb, 2); /* time base g */

    ffio_wfourcc(pb, "Atsq");
    avio_wb32(pb, 16);
    mmf->atsqpos = avio_tell(pb);
    /* Will be filled on close */
    avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);

    mmf->awapos = ff_start_tag(pb, "Awa\x01");

    avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);

    avio_flush(pb);

    return 0;
}

/* Write a variable-length symbol */
static void put_varlength(AVIOContext *pb, int val)
{
    if (val < 128)
        avio_w8(pb, val);
    else {
        val -= 128;
        avio_w8(pb, 0x80 | val >> 7);
        avio_w8(pb, 0x7f & val);
    }
}

static int mmf_write_trailer(AVFormatContext *s)
{
    AVIOContext *pb = s->pb;
    MMFContext *mmf = s->priv_data;
    int64_t pos, size;
    int gatetime;

    if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
        /* Fill in length fields */
        end_tag_be(pb, mmf->awapos);
        end_tag_be(pb, mmf->atrpos);
        end_tag_be(pb, 8);

        pos  = avio_tell(pb);
        size = pos - mmf->awapos;

        /* Fill Atsq chunk */
        avio_seek(pb, mmf->atsqpos, SEEK_SET);

        /* "play wav" */
        avio_w8(pb, 0); /* start time */
        avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
        gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
        put_varlength(pb, gatetime); /* duration */

        /* "nop" */
        put_varlength(pb, gatetime); /* start time */
        avio_write(pb, "\xff\x00", 2); /* nop */

        /* "end of sequence" */
        avio_write(pb, "\x00\x00\x00\x00", 4);

        avio_seek(pb, pos, SEEK_SET);

        avio_flush(pb);
    }
    return 0;
}
#endif /* CONFIG_MMF_MUXER */

static int mmf_probe(AVProbeData *p)
{
    /* check file header */
    if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
        p->buf[2] == 'M' && p->buf[3] == 'D' &&
        p->buf[8] == 'C' && p->buf[9] == 'N' &&
        p->buf[10] == 'T' && p->buf[11] == 'I')
        return AVPROBE_SCORE_MAX;
    else
        return 0;
}

/* mmf input */
static int mmf_read_header(AVFormatContext *s)
{
    MMFContext *mmf = s->priv_data;
    unsigned int tag;
    AVIOContext *pb = s->pb;
    AVStream *st;
    int64_t size;
    int rate, params;

    tag = avio_rl32(pb);
    if (tag != MKTAG('M', 'M', 'M', 'D'))
        return AVERROR_INVALIDDATA;
    avio_skip(pb, 4); /* file_size */

    /* Skip some unused chunks that may or may not be present */
    for (;; avio_skip(pb, size)) {
        tag  = avio_rl32(pb);
        size = avio_rb32(pb);
        if (tag == MKTAG('C', 'N', 'T', 'I'))
            continue;
        if (tag == MKTAG('O', 'P', 'D', 'A'))
            continue;
        break;
    }

    /* Tag = "ATRx", where "x" = track number */
    if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
        av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
        return AVERROR_PATCHWELCOME;
    }
    if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
        av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
        return AVERROR_PATCHWELCOME;
    }

    avio_r8(pb); /* format type */
    avio_r8(pb); /* sequence type */
    params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
    rate   = mmf_rate(params & 0x0f);
    if (rate < 0) {
        av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
        return AVERROR_INVALIDDATA;
    }
    avio_r8(pb); /* wave base bit */
    avio_r8(pb); /* time base d */
    avio_r8(pb); /* time base g */

    /* Skip some unused chunks that may or may not be present */
    for (;; avio_skip(pb, size)) {
        tag  = avio_rl32(pb);
        size = avio_rb32(pb);
        if (tag == MKTAG('A', 't', 's', 'q'))
            continue;
        if (tag == MKTAG('A', 's', 'p', 'I'))
            continue;
        break;
    }

    /* Make sure it's followed by an Awa chunk, aka wave data */
    if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
        av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
        return AVERROR_INVALIDDATA;
    }
    mmf->data_end = avio_tell(pb) + size;

    st = avformat_new_stream(s, NULL);
    if (!st)
        return AVERROR(ENOMEM);

    st->codecpar->codec_type            = AVMEDIA_TYPE_AUDIO;
    st->codecpar->codec_id              = AV_CODEC_ID_ADPCM_YAMAHA;
    st->codecpar->sample_rate           = rate;
    st->codecpar->channels              = (params >> 7) + 1;
    st->codecpar->channel_layout        = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
    st->codecpar->bits_per_coded_sample = 4;
    st->codecpar->bit_rate              = st->codecpar->sample_rate *
                                          st->codecpar->bits_per_coded_sample;

    avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);

    return 0;
}

#define MAX_SIZE 4096

static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
{
    MMFContext *mmf = s->priv_data;
    int64_t left, size;
    int ret;

    left = mmf->data_end - avio_tell(s->pb);
    size = FFMIN(left, MAX_SIZE);
    if (avio_feof(s->pb) || size <= 0)
        return AVERROR_EOF;

    ret = av_get_packet(s->pb, pkt, size);
    if (ret < 0)
        return ret;

    pkt->stream_index = 0;

    return ret;
}

#if CONFIG_MMF_DEMUXER
AVInputFormat ff_mmf_demuxer = {
    .name           = "mmf",
    .long_name      = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
    .priv_data_size = sizeof(MMFContext),
    .read_probe     = mmf_probe,
    .read_header    = mmf_read_header,
    .read_packet    = mmf_read_packet,
    .flags          = AVFMT_GENERIC_INDEX,
};
#endif

#if CONFIG_MMF_MUXER
AVOutputFormat ff_mmf_muxer = {
    .name           = "mmf",
    .long_name      = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
    .mime_type      = "application/vnd.smaf",
    .extensions     = "mmf",
    .priv_data_size = sizeof(MMFContext),
    .audio_codec    = AV_CODEC_ID_ADPCM_YAMAHA,
    .video_codec    = AV_CODEC_ID_NONE,
    .write_header   = mmf_write_header,
    .write_packet   = ff_raw_write_packet,
    .write_trailer  = mmf_write_trailer,
};
#endif