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2ba45a60 DM |
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 "libavutil/channel_layout.h" | |
23 | #include "avformat.h" | |
24 | #include "avio_internal.h" | |
25 | #include "internal.h" | |
26 | #include "pcm.h" | |
27 | #include "rawenc.h" | |
28 | #include "riff.h" | |
29 | ||
30 | typedef struct { | |
31 | int64_t atrpos, atsqpos, awapos; | |
32 | int64_t data_end; | |
33 | int stereo; | |
34 | } MMFContext; | |
35 | ||
36 | static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 }; | |
37 | ||
38 | static int mmf_rate(int code) | |
39 | { | |
40 | if ((code < 0) || (code > 4)) | |
41 | return -1; | |
42 | return mmf_rates[code]; | |
43 | } | |
44 | ||
45 | #if CONFIG_MMF_MUXER | |
46 | static int mmf_rate_code(int rate) | |
47 | { | |
48 | int i; | |
49 | for (i = 0; i < 5; i++) | |
50 | if (mmf_rates[i] == rate) | |
51 | return i; | |
52 | return -1; | |
53 | } | |
54 | ||
55 | /* Copy of end_tag() from avienc.c, but for big-endian chunk size */ | |
56 | static void end_tag_be(AVIOContext *pb, int64_t start) | |
57 | { | |
58 | int64_t pos; | |
59 | ||
60 | pos = avio_tell(pb); | |
61 | avio_seek(pb, start - 4, SEEK_SET); | |
62 | avio_wb32(pb, (uint32_t)(pos - start)); | |
63 | avio_seek(pb, pos, SEEK_SET); | |
64 | } | |
65 | ||
66 | static int mmf_write_header(AVFormatContext *s) | |
67 | { | |
68 | MMFContext *mmf = s->priv_data; | |
69 | AVIOContext *pb = s->pb; | |
70 | int64_t pos; | |
71 | int rate; | |
72 | const char *version = s->flags & AVFMT_FLAG_BITEXACT ? | |
73 | "VN:Lavf," : | |
74 | "VN:"LIBAVFORMAT_IDENT","; | |
75 | ||
76 | rate = mmf_rate_code(s->streams[0]->codec->sample_rate); | |
77 | if (rate < 0) { | |
78 | av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n", | |
79 | s->streams[0]->codec->sample_rate); | |
80 | return AVERROR(EINVAL); | |
81 | } | |
82 | ||
83 | mmf->stereo = s->streams[0]->codec->channels > 1; | |
84 | if (mmf->stereo && | |
f6fa7814 | 85 | s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) { |
2ba45a60 DM |
86 | av_log(s, AV_LOG_ERROR, "Yamaha SMAF stereo is experimental, " |
87 | "add '-strict %d' if you want to use it.\n", | |
88 | FF_COMPLIANCE_EXPERIMENTAL); | |
89 | return AVERROR(EINVAL); | |
90 | } | |
91 | ||
92 | ffio_wfourcc(pb, "MMMD"); | |
93 | avio_wb32(pb, 0); | |
94 | pos = ff_start_tag(pb, "CNTI"); | |
95 | avio_w8(pb, 0); /* class */ | |
96 | avio_w8(pb, 1); /* type */ | |
97 | avio_w8(pb, 1); /* code type */ | |
98 | avio_w8(pb, 0); /* status */ | |
99 | avio_w8(pb, 0); /* counts */ | |
100 | end_tag_be(pb, pos); | |
101 | ||
102 | pos = ff_start_tag(pb, "OPDA"); | |
103 | avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */ | |
104 | end_tag_be(pb, pos); | |
105 | ||
106 | avio_write(pb, "ATR\x00", 4); | |
107 | avio_wb32(pb, 0); | |
108 | mmf->atrpos = avio_tell(pb); | |
109 | avio_w8(pb, 0); /* format type */ | |
110 | avio_w8(pb, 0); /* sequence type */ | |
111 | avio_w8(pb, (mmf->stereo << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */ | |
112 | avio_w8(pb, 0); /* wave base bit */ | |
113 | avio_w8(pb, 2); /* time base d */ | |
114 | avio_w8(pb, 2); /* time base g */ | |
115 | ||
116 | ffio_wfourcc(pb, "Atsq"); | |
117 | avio_wb32(pb, 16); | |
118 | mmf->atsqpos = avio_tell(pb); | |
119 | /* Will be filled on close */ | |
120 | avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16); | |
121 | ||
122 | mmf->awapos = ff_start_tag(pb, "Awa\x01"); | |
123 | ||
124 | avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate); | |
125 | ||
126 | avio_flush(pb); | |
127 | ||
128 | return 0; | |
129 | } | |
130 | ||
131 | /* Write a variable-length symbol */ | |
132 | static void put_varlength(AVIOContext *pb, int val) | |
133 | { | |
134 | if (val < 128) | |
135 | avio_w8(pb, val); | |
136 | else { | |
137 | val -= 128; | |
138 | avio_w8(pb, 0x80 | val >> 7); | |
139 | avio_w8(pb, 0x7f & val); | |
140 | } | |
141 | } | |
142 | ||
143 | static int mmf_write_trailer(AVFormatContext *s) | |
144 | { | |
145 | AVIOContext *pb = s->pb; | |
146 | MMFContext *mmf = s->priv_data; | |
147 | int64_t pos, size; | |
148 | int gatetime; | |
149 | ||
150 | if (s->pb->seekable) { | |
151 | /* Fill in length fields */ | |
152 | end_tag_be(pb, mmf->awapos); | |
153 | end_tag_be(pb, mmf->atrpos); | |
154 | end_tag_be(pb, 8); | |
155 | ||
156 | pos = avio_tell(pb); | |
157 | size = pos - mmf->awapos; | |
158 | ||
159 | /* Fill Atsq chunk */ | |
160 | avio_seek(pb, mmf->atsqpos, SEEK_SET); | |
161 | ||
162 | /* "play wav" */ | |
163 | avio_w8(pb, 0); /* start time */ | |
164 | avio_w8(pb, (mmf->stereo << 6) | 1); /* (channel << 6) | wavenum */ | |
165 | gatetime = size * 500 / s->streams[0]->codec->sample_rate; | |
166 | put_varlength(pb, gatetime); /* duration */ | |
167 | ||
168 | /* "nop" */ | |
169 | put_varlength(pb, gatetime); /* start time */ | |
170 | avio_write(pb, "\xff\x00", 2); /* nop */ | |
171 | ||
172 | /* "end of sequence" */ | |
173 | avio_write(pb, "\x00\x00\x00\x00", 4); | |
174 | ||
175 | avio_seek(pb, pos, SEEK_SET); | |
176 | ||
177 | avio_flush(pb); | |
178 | } | |
179 | return 0; | |
180 | } | |
181 | #endif /* CONFIG_MMF_MUXER */ | |
182 | ||
183 | static int mmf_probe(AVProbeData *p) | |
184 | { | |
185 | /* check file header */ | |
186 | if (p->buf[0] == 'M' && p->buf[1] == 'M' && | |
187 | p->buf[2] == 'M' && p->buf[3] == 'D' && | |
188 | p->buf[8] == 'C' && p->buf[9] == 'N' && | |
189 | p->buf[10] == 'T' && p->buf[11] == 'I') | |
190 | return AVPROBE_SCORE_MAX; | |
191 | else | |
192 | return 0; | |
193 | } | |
194 | ||
195 | /* mmf input */ | |
196 | static int mmf_read_header(AVFormatContext *s) | |
197 | { | |
198 | MMFContext *mmf = s->priv_data; | |
199 | unsigned int tag; | |
200 | AVIOContext *pb = s->pb; | |
201 | AVStream *st; | |
202 | int64_t size; | |
203 | int rate, params; | |
204 | ||
205 | tag = avio_rl32(pb); | |
206 | if (tag != MKTAG('M', 'M', 'M', 'D')) | |
207 | return AVERROR_INVALIDDATA; | |
208 | avio_skip(pb, 4); /* file_size */ | |
209 | ||
210 | /* Skip some unused chunks that may or may not be present */ | |
211 | for (;; avio_skip(pb, size)) { | |
212 | tag = avio_rl32(pb); | |
213 | size = avio_rb32(pb); | |
214 | if (tag == MKTAG('C', 'N', 'T', 'I')) | |
215 | continue; | |
216 | if (tag == MKTAG('O', 'P', 'D', 'A')) | |
217 | continue; | |
218 | break; | |
219 | } | |
220 | ||
221 | /* Tag = "ATRx", where "x" = track number */ | |
222 | if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) { | |
223 | av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n"); | |
224 | return AVERROR_PATCHWELCOME; | |
225 | } | |
226 | if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) { | |
227 | av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag); | |
228 | return AVERROR_PATCHWELCOME; | |
229 | } | |
230 | ||
231 | avio_r8(pb); /* format type */ | |
232 | avio_r8(pb); /* sequence type */ | |
233 | params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */ | |
234 | rate = mmf_rate(params & 0x0f); | |
235 | if (rate < 0) { | |
236 | av_log(s, AV_LOG_ERROR, "Invalid sample rate\n"); | |
237 | return AVERROR_INVALIDDATA; | |
238 | } | |
239 | avio_r8(pb); /* wave base bit */ | |
240 | avio_r8(pb); /* time base d */ | |
241 | avio_r8(pb); /* time base g */ | |
242 | ||
243 | /* Skip some unused chunks that may or may not be present */ | |
244 | for (;; avio_skip(pb, size)) { | |
245 | tag = avio_rl32(pb); | |
246 | size = avio_rb32(pb); | |
247 | if (tag == MKTAG('A', 't', 's', 'q')) | |
248 | continue; | |
249 | if (tag == MKTAG('A', 's', 'p', 'I')) | |
250 | continue; | |
251 | break; | |
252 | } | |
253 | ||
254 | /* Make sure it's followed by an Awa chunk, aka wave data */ | |
255 | if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) { | |
256 | av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag); | |
257 | return AVERROR_INVALIDDATA; | |
258 | } | |
259 | mmf->data_end = avio_tell(pb) + size; | |
260 | ||
261 | st = avformat_new_stream(s, NULL); | |
262 | if (!st) | |
263 | return AVERROR(ENOMEM); | |
264 | ||
265 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
266 | st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA; | |
267 | st->codec->sample_rate = rate; | |
268 | st->codec->channels = (params >> 7) + 1; | |
269 | st->codec->channel_layout = params >> 7 ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO; | |
270 | st->codec->bits_per_coded_sample = 4; | |
271 | st->codec->bit_rate = st->codec->sample_rate * | |
272 | st->codec->bits_per_coded_sample; | |
273 | ||
274 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
275 | ||
276 | return 0; | |
277 | } | |
278 | ||
279 | #define MAX_SIZE 4096 | |
280 | ||
281 | static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt) | |
282 | { | |
283 | MMFContext *mmf = s->priv_data; | |
284 | int64_t left, size; | |
285 | int ret; | |
286 | ||
287 | left = mmf->data_end - avio_tell(s->pb); | |
288 | size = FFMIN(left, MAX_SIZE); | |
289 | if (avio_feof(s->pb) || size <= 0) | |
290 | return AVERROR_EOF; | |
291 | ||
292 | ret = av_get_packet(s->pb, pkt, size); | |
293 | if (ret < 0) | |
294 | return ret; | |
295 | ||
296 | pkt->stream_index = 0; | |
297 | ||
298 | return ret; | |
299 | } | |
300 | ||
301 | #if CONFIG_MMF_DEMUXER | |
302 | AVInputFormat ff_mmf_demuxer = { | |
303 | .name = "mmf", | |
304 | .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), | |
305 | .priv_data_size = sizeof(MMFContext), | |
306 | .read_probe = mmf_probe, | |
307 | .read_header = mmf_read_header, | |
308 | .read_packet = mmf_read_packet, | |
309 | .flags = AVFMT_GENERIC_INDEX, | |
310 | }; | |
311 | #endif | |
312 | ||
313 | #if CONFIG_MMF_MUXER | |
314 | AVOutputFormat ff_mmf_muxer = { | |
315 | .name = "mmf", | |
316 | .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"), | |
317 | .mime_type = "application/vnd.smaf", | |
318 | .extensions = "mmf", | |
319 | .priv_data_size = sizeof(MMFContext), | |
320 | .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA, | |
321 | .video_codec = AV_CODEC_ID_NONE, | |
322 | .write_header = mmf_write_header, | |
323 | .write_packet = ff_raw_write_packet, | |
324 | .write_trailer = mmf_write_trailer, | |
325 | }; | |
326 | #endif |