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"
30 int64_t atrpos, atsqpos, awapos;
34 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
36 static int mmf_rate(int code)
38 if((code < 0) || (code > 4))
40 return mmf_rates[code];
44 static int mmf_rate_code(int rate)
47 for(i = 0; i < 5; i++)
48 if(mmf_rates[i] == rate)
53 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
54 static void end_tag_be(AVIOContext *pb, int64_t start)
59 avio_seek(pb, start - 4, SEEK_SET);
60 avio_wb32(pb, (uint32_t)(pos - start));
61 avio_seek(pb, pos, SEEK_SET);
64 static int mmf_write_header(AVFormatContext *s)
66 MMFContext *mmf = s->priv_data;
67 AVIOContext *pb = s->pb;
71 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
73 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);
77 ffio_wfourcc(pb, "MMMD");
79 pos = ff_start_tag(pb, "CNTI");
80 avio_w8(pb, 0); /* class */
81 avio_w8(pb, 1); /* type */
82 avio_w8(pb, 1); /* code type */
83 avio_w8(pb, 0); /* status */
84 avio_w8(pb, 0); /* counts */
85 avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
88 avio_write(pb, "ATR\x00", 4);
90 mmf->atrpos = avio_tell(pb);
91 avio_w8(pb, 0); /* format type */
92 avio_w8(pb, 0); /* sequence type */
93 avio_w8(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
94 avio_w8(pb, 0); /* wave base bit */
95 avio_w8(pb, 2); /* time base d */
96 avio_w8(pb, 2); /* time base g */
98 ffio_wfourcc(pb, "Atsq");
100 mmf->atsqpos = avio_tell(pb);
101 /* Will be filled on close */
102 avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
104 mmf->awapos = ff_start_tag(pb, "Awa\x01");
106 avpriv_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
113 static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
115 AVIOContext *pb = s->pb;
116 avio_write(pb, pkt->data, pkt->size);
120 /* Write a variable-length symbol */
121 static void put_varlength(AVIOContext *pb, int val)
127 avio_w8(pb, 0x80 | val >> 7);
128 avio_w8(pb, 0x7f & val);
132 static int mmf_write_trailer(AVFormatContext *s)
134 AVIOContext *pb = s->pb;
135 MMFContext *mmf = s->priv_data;
139 if (s->pb->seekable) {
140 /* Fill in length fields */
141 end_tag_be(pb, mmf->awapos);
142 end_tag_be(pb, mmf->atrpos);
146 size = pos - mmf->awapos;
148 /* Fill Atsq chunk */
149 avio_seek(pb, mmf->atsqpos, SEEK_SET);
152 avio_w8(pb, 0); /* start time */
153 avio_w8(pb, 1); /* (channel << 6) | wavenum */
154 gatetime = size * 500 / s->streams[0]->codec->sample_rate;
155 put_varlength(pb, gatetime); /* duration */
158 put_varlength(pb, gatetime); /* start time */
159 avio_write(pb, "\xff\x00", 2); /* nop */
161 /* "end of sequence" */
162 avio_write(pb, "\x00\x00\x00\x00", 4);
164 avio_seek(pb, pos, SEEK_SET);
170 #endif /* CONFIG_MMF_MUXER */
172 static int mmf_probe(AVProbeData *p)
174 /* check file header */
175 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
176 p->buf[2] == 'M' && p->buf[3] == 'D' &&
177 p->buf[8] == 'C' && p->buf[9] == 'N' &&
178 p->buf[10] == 'T' && p->buf[11] == 'I')
179 return AVPROBE_SCORE_MAX;
185 static int mmf_read_header(AVFormatContext *s)
187 MMFContext *mmf = s->priv_data;
189 AVIOContext *pb = s->pb;
195 if (tag != MKTAG('M', 'M', 'M', 'D'))
197 avio_skip(pb, 4); /* file_size */
199 /* Skip some unused chunks that may or may not be present */
200 for(;; avio_skip(pb, size)) {
202 size = avio_rb32(pb);
203 if(tag == MKTAG('C','N','T','I')) continue;
204 if(tag == MKTAG('O','P','D','A')) continue;
208 /* Tag = "ATRx", where "x" = track number */
209 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
210 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
213 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
214 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
218 avio_r8(pb); /* format type */
219 avio_r8(pb); /* sequence type */
220 params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
221 rate = mmf_rate(params & 0x0f);
223 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
226 avio_r8(pb); /* wave base bit */
227 avio_r8(pb); /* time base d */
228 avio_r8(pb); /* time base g */
230 /* Skip some unused chunks that may or may not be present */
231 for(;; avio_skip(pb, size)) {
233 size = avio_rb32(pb);
234 if(tag == MKTAG('A','t','s','q')) continue;
235 if(tag == MKTAG('A','s','p','I')) continue;
239 /* Make sure it's followed by an Awa chunk, aka wave data */
240 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
241 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
244 mmf->data_size = size;
246 st = avformat_new_stream(s, NULL);
248 return AVERROR(ENOMEM);
250 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
251 st->codec->codec_id = AV_CODEC_ID_ADPCM_YAMAHA;
252 st->codec->sample_rate = rate;
253 st->codec->channels = 1;
254 st->codec->channel_layout = AV_CH_LAYOUT_MONO;
255 st->codec->bits_per_coded_sample = 4;
256 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample;
258 avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate);
263 #define MAX_SIZE 4096
265 static int mmf_read_packet(AVFormatContext *s,
268 MMFContext *mmf = s->priv_data;
271 if (url_feof(s->pb) || !mmf->data_size)
274 size = FFMIN(MAX_SIZE, mmf->data_size);
276 ret = av_get_packet(s->pb, pkt, size);
280 pkt->stream_index = 0;
281 mmf->data_size -= ret;
286 #if CONFIG_MMF_DEMUXER
287 AVInputFormat ff_mmf_demuxer = {
289 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
290 .priv_data_size = sizeof(MMFContext),
291 .read_probe = mmf_probe,
292 .read_header = mmf_read_header,
293 .read_packet = mmf_read_packet,
294 .read_seek = ff_pcm_read_seek,
298 AVOutputFormat ff_mmf_muxer = {
300 .long_name = NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
301 .mime_type = "application/vnd.smaf",
303 .priv_data_size = sizeof(MMFContext),
304 .audio_codec = AV_CODEC_ID_ADPCM_YAMAHA,
305 .video_codec = AV_CODEC_ID_NONE,
306 .write_header = mmf_write_header,
307 .write_packet = mmf_write_packet,
308 .write_trailer = mmf_write_trailer,