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"
25 #include "avio_internal.h"
31 int64_t atrpos, atsqpos, awapos;
35 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
37 static int mmf_rate(int code)
39 if((code < 0) || (code > 4))
41 return mmf_rates[code];
45 static int mmf_rate_code(int rate)
48 for(i = 0; i < 5; i++)
49 if(mmf_rates[i] == rate)
54 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
55 static void end_tag_be(AVIOContext *pb, int64_t start)
60 avio_seek(pb, start - 4, SEEK_SET);
61 avio_wb32(pb, (uint32_t)(pos - start));
62 avio_seek(pb, pos, SEEK_SET);
65 static int mmf_write_header(AVFormatContext *s)
67 MMFContext *mmf = s->priv_data;
68 AVIOContext *pb = s->pb;
72 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
74 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d, supported are 4000, 8000, 11025, 22050 and 44100\n", s->streams[0]->codec->sample_rate);
75 return AVERROR(EINVAL);
78 ffio_wfourcc(pb, "MMMD");
80 pos = ff_start_tag(pb, "CNTI");
81 avio_w8(pb, 0); /* class */
82 avio_w8(pb, 1); /* type */
83 avio_w8(pb, 1); /* code type */
84 avio_w8(pb, 0); /* status */
85 avio_w8(pb, 0); /* counts */
86 avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
89 avio_write(pb, "ATR\x00", 4);
91 mmf->atrpos = avio_tell(pb);
92 avio_w8(pb, 0); /* format type */
93 avio_w8(pb, 0); /* sequence type */
94 avio_w8(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
95 avio_w8(pb, 0); /* wave base bit */
96 avio_w8(pb, 2); /* time base d */
97 avio_w8(pb, 2); /* time base g */
99 ffio_wfourcc(pb, "Atsq");
101 mmf->atsqpos = avio_tell(pb);
102 /* Will be filled on close */
103 avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
105 mmf->awapos = ff_start_tag(pb, "Awa\x01");
107 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
114 /* Write a variable-length symbol */
115 static void put_varlength(AVIOContext *pb, int val)
121 avio_w8(pb, 0x80 | val >> 7);
122 avio_w8(pb, 0x7f & val);
126 static int mmf_write_trailer(AVFormatContext *s)
128 AVIOContext *pb = s->pb;
129 MMFContext *mmf = s->priv_data;
133 if (s->pb->seekable) {
134 /* Fill in length fields */
135 end_tag_be(pb, mmf->awapos);
136 end_tag_be(pb, mmf->atrpos);
140 size = pos - mmf->awapos;
142 /* Fill Atsq chunk */
143 avio_seek(pb, mmf->atsqpos, SEEK_SET);
146 avio_w8(pb, 0); /* start time */
147 avio_w8(pb, 1); /* (channel << 6) | wavenum */
148 gatetime = size * 500 / s->streams[0]->codec->sample_rate;
149 put_varlength(pb, gatetime); /* duration */
152 put_varlength(pb, gatetime); /* start time */
153 avio_write(pb, "\xff\x00", 2); /* nop */
155 /* "end of sequence" */
156 avio_write(pb, "\x00\x00\x00\x00", 4);
158 avio_seek(pb, pos, SEEK_SET);
164 #endif /* CONFIG_MMF_MUXER */
166 static int mmf_probe(AVProbeData *p)
168 /* check file header */
169 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
170 p->buf[2] == 'M' && p->buf[3] == 'D' &&
171 p->buf[8] == 'C' && p->buf[9] == 'N' &&
172 p->buf[10] == 'T' && p->buf[11] == 'I')
173 return AVPROBE_SCORE_MAX;
179 static int mmf_read_header(AVFormatContext *s)
181 MMFContext *mmf = s->priv_data;
183 AVIOContext *pb = s->pb;
189 if (tag != MKTAG('M', 'M', 'M', 'D'))
190 return AVERROR_INVALIDDATA;
191 avio_skip(pb, 4); /* file_size */
193 /* Skip some unused chunks that may or may not be present */
194 for(;; avio_skip(pb, size)) {
196 size = avio_rb32(pb);
197 if(tag == MKTAG('C','N','T','I')) continue;
198 if(tag == MKTAG('O','P','D','A')) continue;
202 /* Tag = "ATRx", where "x" = track number */
203 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
204 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
205 return AVERROR_PATCHWELCOME;
207 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
208 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
209 return AVERROR_PATCHWELCOME;
212 avio_r8(pb); /* format type */
213 avio_r8(pb); /* sequence type */
214 params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
215 rate = mmf_rate(params & 0x0f);
217 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
218 return AVERROR_INVALIDDATA;
220 avio_r8(pb); /* wave base bit */
221 avio_r8(pb); /* time base d */
222 avio_r8(pb); /* time base g */
224 /* Skip some unused chunks that may or may not be present */
225 for(;; avio_skip(pb, size)) {
227 size = avio_rb32(pb);
228 if(tag == MKTAG('A','t','s','q')) continue;
229 if(tag == MKTAG('A','s','p','I')) continue;
233 /* Make sure it's followed by an Awa chunk, aka wave data */
234 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
235 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
236 return AVERROR_INVALIDDATA;
238 mmf->data_end = avio_tell(pb) + size;
240 st = avformat_new_stream(s, NULL);
242 return AVERROR(ENOMEM);
244 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
245 st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
246 st->codec->sample_rate = rate;
247 st->codec->channels = 1;
248 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
249 st->codec->bits_per_coded_sample = 4;
250 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample;
252 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
257 #define MAX_SIZE 4096
259 static int mmf_read_packet(AVFormatContext *s,
262 MMFContext *mmf = s->priv_data;
266 left = mmf->data_end - avio_tell(s->pb);
267 size = FFMIN(left, MAX_SIZE);
268 if (url_feof(s->pb) || size <= 0)
271 ret = av_get_packet(s->pb, pkt, size);
275 pkt->stream_index = 0;
280 #if CONFIG_MMF_DEMUXER
281 AVInputFormat ff_mmf_demuxer = {
283 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
284 .priv_data_size = sizeof(MMFContext),
285 .read_probe = mmf_probe,
286 .read_header = mmf_read_header,
287 .read_packet = mmf_read_packet,
288 .flags = AVFMT_GENERIC_INDEX,
292 AVOutputFormat ff_mmf_muxer = {
294 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
295 .mime_type = "application/vnd.smaf",
297 .priv_data_size = sizeof(MMFContext),
298 .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
299 .video_codec = AV_CODEC_ID_NONE,
300 .write_header = mmf_write_header,
301 .write_packet = ff_raw_write_packet,
302 .write_trailer = mmf_write_trailer,