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 "avio_internal.h"
27 int64_t atrpos, atsqpos, awapos;
31 static const int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
33 static int mmf_rate(int code)
35 if((code < 0) || (code > 4))
37 return mmf_rates[code];
41 static int mmf_rate_code(int rate)
44 for(i = 0; i < 5; i++)
45 if(mmf_rates[i] == rate)
50 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
51 static void end_tag_be(AVIOContext *pb, int64_t start)
56 avio_seek(pb, start - 4, SEEK_SET);
57 avio_wb32(pb, (uint32_t)(pos - start));
58 avio_seek(pb, pos, SEEK_SET);
61 static int mmf_write_header(AVFormatContext *s)
63 MMFContext *mmf = s->priv_data;
64 AVIOContext *pb = s->pb;
68 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
70 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate);
74 ffio_wfourcc(pb, "MMMD");
76 pos = ff_start_tag(pb, "CNTI");
77 avio_w8(pb, 0); /* class */
78 avio_w8(pb, 0); /* type */
79 avio_w8(pb, 0); /* code type */
80 avio_w8(pb, 0); /* status */
81 avio_w8(pb, 0); /* counts */
82 avio_write(pb, "VN:libavcodec,", sizeof("VN:libavcodec,") -1); /* metadata ("ST:songtitle,VN:version,...") */
85 avio_write(pb, "ATR\x00", 4);
87 mmf->atrpos = avio_tell(pb);
88 avio_w8(pb, 0); /* format type */
89 avio_w8(pb, 0); /* sequence type */
90 avio_w8(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
91 avio_w8(pb, 0); /* wave base bit */
92 avio_w8(pb, 2); /* time base d */
93 avio_w8(pb, 2); /* time base g */
95 ffio_wfourcc(pb, "Atsq");
97 mmf->atsqpos = avio_tell(pb);
98 /* Will be filled on close */
99 avio_write(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
101 mmf->awapos = ff_start_tag(pb, "Awa\x01");
103 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
105 put_flush_packet(pb);
110 static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
112 AVIOContext *pb = s->pb;
113 avio_write(pb, pkt->data, pkt->size);
117 /* Write a variable-length symbol */
118 static void put_varlength(AVIOContext *pb, int val)
124 avio_w8(pb, 0x80 | val >> 7);
125 avio_w8(pb, 0x7f & val);
129 static int mmf_write_trailer(AVFormatContext *s)
131 AVIOContext *pb = s->pb;
132 MMFContext *mmf = s->priv_data;
136 if (!url_is_streamed(s->pb)) {
137 /* Fill in length fields */
138 end_tag_be(pb, mmf->awapos);
139 end_tag_be(pb, mmf->atrpos);
143 size = pos - mmf->awapos;
145 /* Fill Atsq chunk */
146 avio_seek(pb, mmf->atsqpos, SEEK_SET);
149 avio_w8(pb, 0); /* start time */
150 avio_w8(pb, 1); /* (channel << 6) | wavenum */
151 gatetime = size * 500 / s->streams[0]->codec->sample_rate;
152 put_varlength(pb, gatetime); /* duration */
155 put_varlength(pb, gatetime); /* start time */
156 avio_write(pb, "\xff\x00", 2); /* nop */
158 /* "end of sequence" */
159 avio_write(pb, "\x00\x00\x00\x00", 4);
161 avio_seek(pb, pos, SEEK_SET);
163 put_flush_packet(pb);
167 #endif /* CONFIG_MMF_MUXER */
169 static int mmf_probe(AVProbeData *p)
171 /* check file header */
172 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
173 p->buf[2] == 'M' && p->buf[3] == 'D' &&
174 p->buf[8] == 'C' && p->buf[9] == 'N' &&
175 p->buf[10] == 'T' && p->buf[11] == 'I')
176 return AVPROBE_SCORE_MAX;
182 static int mmf_read_header(AVFormatContext *s,
183 AVFormatParameters *ap)
185 MMFContext *mmf = s->priv_data;
187 AVIOContext *pb = s->pb;
189 int64_t file_size, size;
193 if (tag != MKTAG('M', 'M', 'M', 'D'))
195 file_size = avio_rb32(pb);
197 /* Skip some unused chunks that may or may not be present */
198 for(;; avio_seek(pb, size, SEEK_CUR)) {
200 size = avio_rb32(pb);
201 if(tag == MKTAG('C','N','T','I')) continue;
202 if(tag == MKTAG('O','P','D','A')) continue;
206 /* Tag = "ATRx", where "x" = track number */
207 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
208 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
211 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
212 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
216 avio_r8(pb); /* format type */
217 avio_r8(pb); /* sequence type */
218 params = avio_r8(pb); /* (channel << 7) | (format << 4) | rate */
219 rate = mmf_rate(params & 0x0f);
221 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
224 avio_r8(pb); /* wave base bit */
225 avio_r8(pb); /* time base d */
226 avio_r8(pb); /* time base g */
228 /* Skip some unused chunks that may or may not be present */
229 for(;; avio_seek(pb, size, SEEK_CUR)) {
231 size = avio_rb32(pb);
232 if(tag == MKTAG('A','t','s','q')) continue;
233 if(tag == MKTAG('A','s','p','I')) continue;
237 /* Make sure it's followed by an Awa chunk, aka wave data */
238 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
239 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
242 mmf->data_size = size;
244 st = av_new_stream(s, 0);
246 return AVERROR(ENOMEM);
248 st->codec->codec_type = AVMEDIA_TYPE_AUDIO;
249 st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA;
250 st->codec->sample_rate = rate;
251 st->codec->channels = 1;
252 st->codec->bits_per_coded_sample = 4;
253 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_coded_sample;
255 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
260 #define MAX_SIZE 4096
262 static int mmf_read_packet(AVFormatContext *s,
265 MMFContext *mmf = s->priv_data;
274 if(size > mmf->data_size)
275 size = mmf->data_size;
280 if (av_new_packet(pkt, size))
282 pkt->stream_index = 0;
284 ret = avio_read(s->pb, pkt->data, pkt->size);
288 mmf->data_size -= ret;
294 #if CONFIG_MMF_DEMUXER
295 AVInputFormat ff_mmf_demuxer = {
297 NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
307 AVOutputFormat ff_mmf_muxer = {
309 NULL_IF_CONFIG_SMALL("Yamaha SMAF"),
310 "application/vnd.smaf",
313 CODEC_ID_ADPCM_YAMAHA,