FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavformat/mmf.c
Date: 2026-04-24 19:58:39
Exec Total Coverage
Lines: 136 157 86.6%
Functions: 9 9 100.0%
Branches: 38 62 61.3%
Line Branch Exec Source
1 /*
2 * Yamaha SMAF format
3 * Copyright (c) 2005 Vidar Madsen
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 #include "config_components.h"
23
24 #include "libavutil/channel_layout.h"
25 #include "avformat.h"
26 #include "avio_internal.h"
27 #include "demux.h"
28 #include "internal.h"
29 #include "mux.h"
30 #include "pcm.h"
31 #include "rawenc.h"
32 #include "riff.h"
33 #include "version.h"
34
35 typedef struct MMFContext {
36 int64_t atrpos, atsqpos, awapos;
37 int64_t data_end;
38 int stereo;
39 } MMFContext;
40
41 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
42
43 2 static int mmf_rate(int code)
44 {
45
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 2 if ((code < 0) || (code > 4))
46 ✗ return -1;
47 2 return mmf_rates[code];
48 }
49
50 #if CONFIG_MMF_MUXER
51 1 static int mmf_rate_code(int rate)
52 {
53 int i;
54
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 5 for (i = 0; i < 5; i++)
55
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 5 if (mmf_rates[i] == rate)
56 1 return i;
57 ✗ return -1;
58 }
59
60 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
61 5 static void end_tag_be(AVIOContext *pb, int64_t start)
62 {
63 int64_t pos;
64
65 5 pos = avio_tell(pb);
66 5 avio_seek(pb, start - 4, SEEK_SET);
67 5 avio_wb32(pb, (uint32_t)(pos - start));
68 5 avio_seek(pb, pos, SEEK_SET);
69 5 }
70
71 1 static int mmf_write_header(AVFormatContext *s)
72 {
73 1 MMFContext *mmf = s->priv_data;
74 1 AVIOContext *pb = s->pb;
75 int64_t pos;
76 int rate;
77 2 const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
78
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 1 "VN:Lavf," :
79 "VN:"LIBAVFORMAT_IDENT",";
80
81 1 rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
82
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 1 if (rate < 0) {
83 ✗ av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
84 ✗ s->streams[0]->codecpar->sample_rate);
85 ✗ return AVERROR(EINVAL);
86 }
87
88 1 mmf->stereo = s->streams[0]->codecpar->ch_layout.nb_channels > 1;
89
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 1 if (mmf->stereo &&
90 ✗ s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
91 ✗ av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
92 "add '-strict %d' if you want to use it.\n",
93 FF_COMPLIANCE_EXPERIMENTAL);
94 ✗ return AVERROR(EINVAL);
95 }
96
97 1 ffio_wfourcc(pb, "MMMD");
98 1 avio_wb32(pb, 0);
99 1 pos = ff_start_tag(pb, "CNTI");
100 1 avio_w8(pb, 0); /* class */
101 1 avio_w8(pb, 1); /* type */
102 1 avio_w8(pb, 1); /* code type */
103 1 avio_w8(pb, 0); /* status */
104 1 avio_w8(pb, 0); /* counts */
105 1 end_tag_be(pb, pos);
106
107 1 pos = ff_start_tag(pb, "OPDA");
108 1 avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
109 1 end_tag_be(pb, pos);
110
111 1 avio_write(pb, "ATR\x00", 4);
112 1 avio_wb32(pb, 0);
113 1 mmf->atrpos = avio_tell(pb);
114 1 avio_w8(pb, 0); /* format type */
115 1 avio_w8(pb, 0); /* sequence type */
116 1 avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
117 1 avio_w8(pb, 0); /* wave base bit */
118 1 avio_w8(pb, 2); /* time base d */
119 1 avio_w8(pb, 2); /* time base g */
120
121 1 ffio_wfourcc(pb, "Atsq");
122 1 avio_wb32(pb, 16);
123 1 mmf->atsqpos = avio_tell(pb);
124 /* Will be filled on close */
125 1 avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
126
127 1 mmf->awapos = ff_start_tag(pb, "Awa\x01");
128
129 1 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
130
131 1 return 0;
132 }
133
134 /* Write a variable-length symbol */
135 2 static void put_varlength(AVIOContext *pb, int val)
136 {
137
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 2 if (val < 128)
138 ✗ avio_w8(pb, val);
139 else {
140 2 val -= 128;
141 2 avio_w8(pb, 0x80 | val >> 7);
142 2 avio_w8(pb, 0x7f & val);
143 }
144 2 }
145
146 1 static int mmf_write_trailer(AVFormatContext *s)
147 {
148 1 AVIOContext *pb = s->pb;
149 1 MMFContext *mmf = s->priv_data;
150 int64_t pos, size;
151 int gatetime;
152
153
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 1 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
154 /* Fill in length fields */
155 1 end_tag_be(pb, mmf->awapos);
156 1 end_tag_be(pb, mmf->atrpos);
157 1 end_tag_be(pb, 8);
158
159 1 pos = avio_tell(pb);
160 1 size = pos - mmf->awapos;
161
162 /* Fill Atsq chunk */
163 1 avio_seek(pb, mmf->atsqpos, SEEK_SET);
164
165 /* "play wav" */
166 1 avio_w8(pb, 0); /* start time */
167 1 avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
168 1 gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
169 1 put_varlength(pb, gatetime); /* duration */
170
171 /* "nop" */
172 1 put_varlength(pb, gatetime); /* start time */
173 1 avio_write(pb, "\xff\x00", 2); /* nop */
174
175 /* "end of sequence" */
176 1 avio_write(pb, "\x00\x00\x00\x00", 4);
177
178 1 avio_seek(pb, pos, SEEK_SET);
179 }
180 1 return 0;
181 }
182 #endif /* CONFIG_MMF_MUXER */
183
184 7480 static int mmf_probe(const AVProbeData *p)
185 {
186 /* check file header */
187
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 7480 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
188
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 4 p->buf[2] == 'M' && p->buf[3] == 'D' &&
189
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 2 p->buf[8] == 'C' && p->buf[9] == 'N' &&
190
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 2 p->buf[10] == 'T' && p->buf[11] == 'I')
191 2 return AVPROBE_SCORE_MAX;
192 else
193 7478 return 0;
194 }
195
196 /* mmf input */
197 2 static int mmf_read_header(AVFormatContext *s)
198 {
199 2 MMFContext *mmf = s->priv_data;
200 unsigned int tag;
201 2 AVIOContext *pb = s->pb;
202 AVStream *st;
203 int64_t size;
204 int rate, params;
205
206 2 tag = avio_rl32(pb);
207
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 2 if (tag != MKTAG('M', 'M', 'M', 'D'))
208 ✗ return AVERROR_INVALIDDATA;
209 2 avio_skip(pb, 4); /* file_size */
210
211 /* Skip some unused chunks that may or may not be present */
212 4 for (;; avio_skip(pb, size)) {
213 6 tag = avio_rl32(pb);
214 6 size = avio_rb32(pb);
215
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 6 if (tag == MKTAG('C', 'N', 'T', 'I'))
216 2 continue;
217
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 4 if (tag == MKTAG('O', 'P', 'D', 'A'))
218 2 continue;
219 2 break;
220 }
221
222 /* Tag = "ATRx", where "x" = track number */
223
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 2 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
224 ✗ av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
225 ✗ return AVERROR_PATCHWELCOME;
226 }
227
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 2 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
228 ✗ av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
229 ✗ return AVERROR_PATCHWELCOME;
230 }
231
232 2 avio_r8(pb); /* format type */
233 2 avio_r8(pb); /* sequence type */
234 2 params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
235 2 rate = mmf_rate(params & 0x0f);
236
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 2 if (rate < 0) {
237 ✗ av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
238 ✗ return AVERROR_INVALIDDATA;
239 }
240 2 avio_r8(pb); /* wave base bit */
241 2 avio_r8(pb); /* time base d */
242 2 avio_r8(pb); /* time base g */
243
244 /* Skip some unused chunks that may or may not be present */
245 2 for (;; avio_skip(pb, size)) {
246 4 tag = avio_rl32(pb);
247 4 size = avio_rb32(pb);
248
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 4 if (tag == MKTAG('A', 't', 's', 'q'))
249 2 continue;
250
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 2 if (tag == MKTAG('A', 's', 'p', 'I'))
251 ✗ continue;
252 2 break;
253 }
254
255 /* Make sure it's followed by an Awa chunk, aka wave data */
256
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 2 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
257 ✗ av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
258 ✗ return AVERROR_INVALIDDATA;
259 }
260 2 mmf->data_end = avio_tell(pb) + size;
261
262 2 st = avformat_new_stream(s, NULL);
263
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 2 if (!st)
264 ✗ return AVERROR(ENOMEM);
265
266 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
267 2 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
268 2 st->codecpar->sample_rate = rate;
269 2 av_channel_layout_default(&st->codecpar->ch_layout, (params >> 7) + 1);
270 2 st->codecpar->bits_per_coded_sample = 4;
271 2 st->codecpar->bit_rate = st->codecpar->sample_rate *
272 2 st->codecpar->bits_per_coded_sample;
273
274 2 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
275
276 2 return 0;
277 }
278
279 #define MAX_SIZE 4096
280
281 58 static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
282 {
283 58 MMFContext *mmf = s->priv_data;
284 int64_t left, size;
285 int ret;
286
287 58 left = mmf->data_end - avio_tell(s->pb);
288 58 size = FFMIN(left, MAX_SIZE);
289
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 58 if (avio_feof(s->pb) || size <= 0)
290 15 return AVERROR_EOF;
291
292 43 ret = av_get_packet(s->pb, pkt, size);
293
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 43 if (ret < 0)
294 ✗ return ret;
295
296 43 pkt->stream_index = 0;
297
298 43 return ret;
299 }
300
301 #if CONFIG_MMF_DEMUXER
302 const FFInputFormat ff_mmf_demuxer = {
303 .p.name = "mmf",
304 .p.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
305 .p.flags = AVFMT_GENERIC_INDEX,
306 .priv_data_size = sizeof(MMFContext),
307 .read_probe = mmf_probe,
308 .read_header = mmf_read_header,
309 .read_packet = mmf_read_packet,
310 };
311 #endif
312
313 #if CONFIG_MMF_MUXER
314 const FFOutputFormat ff_mmf_muxer = {
315 .p.name = "mmf",
316 .p.long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
317 .p.mime_type = "application/vnd.smaf",
318 .p.extensions = "mmf",
319 .priv_data_size = sizeof(MMFContext),
320 .p.audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
321 .p.video_codec = AV_CODEC_ID_NONE,
322 .p.subtitle_codec = AV_CODEC_ID_NONE,
323 .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH |
324 FF_OFMT_FLAG_ONLY_DEFAULT_CODECS,
325 .write_header = mmf_write_header,
326 .write_packet = ff_raw_write_packet,
327 .write_trailer = mmf_write_trailer,
328 };
329 #endif
330