FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/mmf.c
Date: 2022-12-06 04:36:11
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 "internal.h"
28 #include "pcm.h"
29 #include "rawenc.h"
30 #include "riff.h"
31 #include "version.h"
32
33 typedef struct MMFContext {
34 int64_t atrpos, atsqpos, awapos;
35 int64_t data_end;
36 int stereo;
37 } MMFContext;
38
39 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
40
41 2 static int mmf_rate(int code)
42 {
43
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2 if ((code < 0) || (code > 4))
44 return -1;
45 2 return mmf_rates[code];
46 }
47
48 #if CONFIG_MMF_MUXER
49 1 static int mmf_rate_code(int rate)
50 {
51 int i;
52
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5 for (i = 0; i < 5; i++)
53
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5 if (mmf_rates[i] == rate)
54 1 return i;
55 return -1;
56 }
57
58 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
59 5 static void end_tag_be(AVIOContext *pb, int64_t start)
60 {
61 int64_t pos;
62
63 5 pos = avio_tell(pb);
64 5 avio_seek(pb, start - 4, SEEK_SET);
65 5 avio_wb32(pb, (uint32_t)(pos - start));
66 5 avio_seek(pb, pos, SEEK_SET);
67 5 }
68
69 1 static int mmf_write_header(AVFormatContext *s)
70 {
71 1 MMFContext *mmf = s->priv_data;
72 1 AVIOContext *pb = s->pb;
73 int64_t pos;
74 int rate;
75 2 const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
76
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1 "VN:Lavf," :
77 "VN:"LIBAVFORMAT_IDENT",";
78
79 1 rate = mmf_rate_code(s->streams[0]->codecpar->sample_rate);
80
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1 if (rate < 0) {
81 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n",
82 s->streams[0]->codecpar->sample_rate);
83 return AVERROR(EINVAL);
84 }
85
86 1 mmf->stereo = s->streams[0]->codecpar->ch_layout.nb_channels > 1;
87
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1 if (mmf->stereo &&
88 s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
89 av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, "
90 "add '-strict %d' if you want to use it.\n",
91 FF_COMPLIANCE_EXPERIMENTAL);
92 return AVERROR(EINVAL);
93 }
94
95 1 ffio_wfourcc(pb, "MMMD");
96 1 avio_wb32(pb, 0);
97 1 pos = ff_start_tag(pb, "CNTI");
98 1 avio_w8(pb, 0); /* class */
99 1 avio_w8(pb, 1); /* type */
100 1 avio_w8(pb, 1); /* code type */
101 1 avio_w8(pb, 0); /* status */
102 1 avio_w8(pb, 0); /* counts */
103 1 end_tag_be(pb, pos);
104
105 1 pos = ff_start_tag(pb, "OPDA");
106 1 avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
107 1 end_tag_be(pb, pos);
108
109 1 avio_write(pb, "ATR\x00", 4);
110 1 avio_wb32(pb, 0);
111 1 mmf->atrpos = avio_tell(pb);
112 1 avio_w8(pb, 0); /* format type */
113 1 avio_w8(pb, 0); /* sequence type */
114 1 avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
115 1 avio_w8(pb, 0); /* wave base bit */
116 1 avio_w8(pb, 2); /* time base d */
117 1 avio_w8(pb, 2); /* time base g */
118
119 1 ffio_wfourcc(pb, "Atsq");
120 1 avio_wb32(pb, 16);
121 1 mmf->atsqpos = avio_tell(pb);
122 /* Will be filled on close */
123 1 avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
124
125 1 mmf->awapos = ff_start_tag(pb, "Awa\x01");
126
127 1 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codecpar->sample_rate);
128
129 1 return 0;
130 }
131
132 /* Write a variable-length symbol */
133 2 static void put_varlength(AVIOContext *pb, int val)
134 {
135
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2 if (val < 128)
136 avio_w8(pb, val);
137 else {
138 2 val -= 128;
139 2 avio_w8(pb, 0x80 | val >> 7);
140 2 avio_w8(pb, 0x7f & val);
141 }
142 2 }
143
144 1 static int mmf_write_trailer(AVFormatContext *s)
145 {
146 1 AVIOContext *pb = s->pb;
147 1 MMFContext *mmf = s->priv_data;
148 int64_t pos, size;
149 int gatetime;
150
151
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1 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
152 /* Fill in length fields */
153 1 end_tag_be(pb, mmf->awapos);
154 1 end_tag_be(pb, mmf->atrpos);
155 1 end_tag_be(pb, 8);
156
157 1 pos = avio_tell(pb);
158 1 size = pos - mmf->awapos;
159
160 /* Fill Atsq chunk */
161 1 avio_seek(pb, mmf->atsqpos, SEEK_SET);
162
163 /* "play wav" */
164 1 avio_w8(pb, 0); /* start time */
165 1 avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */
166 1 gatetime = size * 500 / s->streams[0]->codecpar->sample_rate;
167 1 put_varlength(pb, gatetime); /* duration */
168
169 /* "nop" */
170 1 put_varlength(pb, gatetime); /* start time */
171 1 avio_write(pb, "\xff\x00", 2); /* nop */
172
173 /* "end of sequence" */
174 1 avio_write(pb, "\x00\x00\x00\x00", 4);
175
176 1 avio_seek(pb, pos, SEEK_SET);
177 }
178 1 return 0;
179 }
180 #endif /* CONFIG_MMF_MUXER */
181
182 6782 static int mmf_probe(const AVProbeData *p)
183 {
184 /* check file header */
185
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6782 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
186
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4 p->buf[2] == 'M' && p->buf[3] == 'D' &&
187
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2 p->buf[8] == 'C' && p->buf[9] == 'N' &&
188
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2 p->buf[10] == 'T' && p->buf[11] == 'I')
189 2 return AVPROBE_SCORE_MAX;
190 else
191 6780 return 0;
192 }
193
194 /* mmf input */
195 2 static int mmf_read_header(AVFormatContext *s)
196 {
197 2 MMFContext *mmf = s->priv_data;
198 unsigned int tag;
199 2 AVIOContext *pb = s->pb;
200 AVStream *st;
201 int64_t size;
202 int rate, params;
203
204 2 tag = avio_rl32(pb);
205
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2 if (tag != MKTAG('M', 'M', 'M', 'D'))
206 return AVERROR_INVALIDDATA;
207 2 avio_skip(pb, 4); /* file_size */
208
209 /* Skip some unused chunks that may or may not be present */
210 4 for (;; avio_skip(pb, size)) {
211 6 tag = avio_rl32(pb);
212 6 size = avio_rb32(pb);
213
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6 if (tag == MKTAG('C', 'N', 'T', 'I'))
214 2 continue;
215
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4 if (tag == MKTAG('O', 'P', 'D', 'A'))
216 2 continue;
217 2 break;
218 }
219
220 /* Tag = "ATRx", where "x" = track number */
221
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2 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
222 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
223 return AVERROR_PATCHWELCOME;
224 }
225
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2 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
226 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
227 return AVERROR_PATCHWELCOME;
228 }
229
230 2 avio_r8(pb); /* format type */
231 2 avio_r8(pb); /* sequence type */
232 2 params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
233 2 rate = mmf_rate(params & 0x0f);
234
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2 if (rate < 0) {
235 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
236 return AVERROR_INVALIDDATA;
237 }
238 2 avio_r8(pb); /* wave base bit */
239 2 avio_r8(pb); /* time base d */
240 2 avio_r8(pb); /* time base g */
241
242 /* Skip some unused chunks that may or may not be present */
243 2 for (;; avio_skip(pb, size)) {
244 4 tag = avio_rl32(pb);
245 4 size = avio_rb32(pb);
246
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4 if (tag == MKTAG('A', 't', 's', 'q'))
247 2 continue;
248
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2 if (tag == MKTAG('A', 's', 'p', 'I'))
249 continue;
250 2 break;
251 }
252
253 /* Make sure it's followed by an Awa chunk, aka wave data */
254
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2 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
255 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
256 return AVERROR_INVALIDDATA;
257 }
258 2 mmf->data_end = avio_tell(pb) + size;
259
260 2 st = avformat_new_stream(s, NULL);
261
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2 if (!st)
262 return AVERROR(ENOMEM);
263
264 2 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
265 2 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
266 2 st->codecpar->sample_rate = rate;
267 2 av_channel_layout_default(&st->codecpar->ch_layout, (params >> 7) + 1);
268 2 st->codecpar->bits_per_coded_sample = 4;
269 2 st->codecpar->bit_rate = st->codecpar->sample_rate *
270 2 st->codecpar->bits_per_coded_sample;
271
272 2 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
273
274 2 return 0;
275 }
276
277 #define MAX_SIZE 4096
278
279 58 static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
280 {
281 58 MMFContext *mmf = s->priv_data;
282 int64_t left, size;
283 int ret;
284
285 58 left = mmf->data_end - avio_tell(s->pb);
286 58 size = FFMIN(left, MAX_SIZE);
287
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58 if (avio_feof(s->pb) || size <= 0)
288 15 return AVERROR_EOF;
289
290 43 ret = av_get_packet(s->pb, pkt, size);
291
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43 if (ret < 0)
292 return ret;
293
294 43 pkt->stream_index = 0;
295
296 43 return ret;
297 }
298
299 #if CONFIG_MMF_DEMUXER
300 const AVInputFormat ff_mmf_demuxer = {
301 .name = "mmf",
302 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
303 .priv_data_size = sizeof(MMFContext),
304 .read_probe = mmf_probe,
305 .read_header = mmf_read_header,
306 .read_packet = mmf_read_packet,
307 .flags = AVFMT_GENERIC_INDEX,
308 };
309 #endif
310
311 #if CONFIG_MMF_MUXER
312 const AVOutputFormat ff_mmf_muxer = {
313 .name = "mmf",
314 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
315 .mime_type = "application/vnd.smaf",
316 .extensions = "mmf",
317 .priv_data_size = sizeof(MMFContext),
318 .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
319 .video_codec = AV_CODEC_ID_NONE,
320 .write_header = mmf_write_header,
321 .write_packet = ff_raw_write_packet,
322 .write_trailer = mmf_write_trailer,
323 };
324 #endif
325