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 "libavutil/channel_layout.h"
24 #include "avio_internal.h"
31 int64_t atrpos, atsqpos, awapos;
36 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
38 static int mmf_rate(int code)
40 if ((code < 0) || (code > 4))
42 return mmf_rates[code];
46 static int mmf_rate_code(int rate)
49 for (i = 0; i < 5; i++)
50 if (mmf_rates[i] == rate)
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)
61 avio_seek(pb, start - 4, SEEK_SET);
62 avio_wb32(pb, (uint32_t)(pos - start));
63 avio_seek(pb, pos, SEEK_SET);
66 static int mmf_write_header(AVFormatContext *s)
68 MMFContext *mmf = s->priv_data;
69 AVIOContext *pb = s->pb;
72 const char *version = s->flags & AVFMT_FLAG_BITEXACT ?
74 "VN:"LIBAVFORMAT_IDENT",";
76 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
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);
83 mmf->stereo = s->streams[0]->codec->channels > 1;
85 s->streams[0]->codec->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL) {
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);
92 ffio_wfourcc(pb, "MMMD");
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 */
102 pos = ff_start_tag(pb, "OPDA");
103 avio_write(pb, version, strlen(version)); /* metadata ("ST:songtitle,VN:version,...") */
106 avio_write(pb, "ATR\x00", 4);
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 */
116 ffio_wfourcc(pb, "Atsq");
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);
122 mmf->awapos = ff_start_tag(pb, "Awa\x01");
124 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
131 /* Write a variable-length symbol */
132 static void put_varlength(AVIOContext *pb, int val)
138 avio_w8(pb, 0x80 | val >> 7);
139 avio_w8(pb, 0x7f & val);
143 static int mmf_write_trailer(AVFormatContext *s)
145 AVIOContext *pb = s->pb;
146 MMFContext *mmf = s->priv_data;
150 if (s->pb->seekable) {
151 /* Fill in length fields */
152 end_tag_be(pb, mmf->awapos);
153 end_tag_be(pb, mmf->atrpos);
157 size = pos - mmf->awapos;
159 /* Fill Atsq chunk */
160 avio_seek(pb, mmf->atsqpos, SEEK_SET);
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 */
169 put_varlength(pb, gatetime); /* start time */
170 avio_write(pb, "\xff\x00", 2); /* nop */
172 /* "end of sequence" */
173 avio_write(pb, "\x00\x00\x00\x00", 4);
175 avio_seek(pb, pos, SEEK_SET);
181 #endif /* CONFIG_MMF_MUXER */
183 static int mmf_probe(AVProbeData *p)
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;
196 static int mmf_read_header(AVFormatContext *s)
198 MMFContext *mmf = s->priv_data;
200 AVIOContext *pb = s->pb;
206 if (tag != MKTAG('M', 'M', 'M', 'D'))
207 return AVERROR_INVALIDDATA;
208 avio_skip(pb, 4); /* file_size */
210 /* Skip some unused chunks that may or may not be present */
211 for (;; avio_skip(pb, size)) {
213 size = avio_rb32(pb);
214 if (tag == MKTAG('C', 'N', 'T', 'I'))
216 if (tag == MKTAG('O', 'P', 'D', 'A'))
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;
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;
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);
236 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
237 return AVERROR_INVALIDDATA;
239 avio_r8(pb); /* wave base bit */
240 avio_r8(pb); /* time base d */
241 avio_r8(pb); /* time base g */
243 /* Skip some unused chunks that may or may not be present */
244 for (;; avio_skip(pb, size)) {
246 size = avio_rb32(pb);
247 if (tag == MKTAG('A', 't', 's', 'q'))
249 if (tag == MKTAG('A', 's', 'p', 'I'))
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;
259 mmf->data_end = avio_tell(pb) + size;
261 st = avformat_new_stream(s, NULL);
263 return AVERROR(ENOMEM);
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;
274 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
279 #define MAX_SIZE 4096
281 static int mmf_read_packet(AVFormatContext *s, AVPacket *pkt)
283 MMFContext *mmf = s->priv_data;
287 left = mmf->data_end - avio_tell(s->pb);
288 size = FFMIN(left, MAX_SIZE);
289 if (avio_feof(s->pb) || size <= 0)
292 ret = av_get_packet(s->pb, pkt, size);
296 pkt->stream_index = 0;
301 #if CONFIG_MMF_DEMUXER
302 AVInputFormat ff_mmf_demuxer = {
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,
314 AVOutputFormat ff_mmf_muxer = {
316 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
317 .mime_type = "application/vnd.smaf",
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,