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 "allformats.h"
26 offset_t atrpos, atsqpos, awapos;
30 static int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
32 static int mmf_rate_code(int rate)
35 for(i = 0; i < 5; i++)
36 if(mmf_rates[i] == rate)
41 static int mmf_rate(int code)
43 if((code < 0) || (code > 4))
45 return mmf_rates[code];
49 /* Copy of end_tag() from avienc.c, but for big-endian chunk size */
50 static void end_tag_be(ByteIOContext *pb, offset_t start)
55 url_fseek(pb, start - 4, SEEK_SET);
56 put_be32(pb, (uint32_t)(pos - start));
57 url_fseek(pb, pos, SEEK_SET);
60 static int mmf_write_header(AVFormatContext *s)
62 MMFContext *mmf = s->priv_data;
63 ByteIOContext *pb = &s->pb;
67 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
69 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate);
75 pos = start_tag(pb, "CNTI");
76 put_byte(pb, 0); /* class */
77 put_byte(pb, 0); /* type */
78 put_byte(pb, 0); /* code type */
79 put_byte(pb, 0); /* status */
80 put_byte(pb, 0); /* counts */
81 put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */
84 put_buffer(pb, "ATR\x00", 4);
86 mmf->atrpos = url_ftell(pb);
87 put_byte(pb, 0); /* format type */
88 put_byte(pb, 0); /* sequence type */
89 put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
90 put_byte(pb, 0); /* wave base bit */
91 put_byte(pb, 2); /* time base d */
92 put_byte(pb, 2); /* time base g */
96 mmf->atsqpos = url_ftell(pb);
97 /* Will be filled on close */
98 put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
100 mmf->awapos = start_tag(pb, "Awa\x01");
102 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
104 put_flush_packet(pb);
109 static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
111 ByteIOContext *pb = &s->pb;
112 put_buffer(pb, pkt->data, pkt->size);
116 /* Write a variable-length symbol */
117 static void put_varlength(ByteIOContext *pb, int val)
123 put_byte(pb, 0x80 | val >> 7);
124 put_byte(pb, 0x7f & val);
128 static int mmf_write_trailer(AVFormatContext *s)
130 ByteIOContext *pb = &s->pb;
131 MMFContext *mmf = s->priv_data;
135 if (!url_is_streamed(&s->pb)) {
136 /* Fill in length fields */
137 end_tag_be(pb, mmf->awapos);
138 end_tag_be(pb, mmf->atrpos);
142 size = pos - mmf->awapos;
144 /* Fill Atsq chunk */
145 url_fseek(pb, mmf->atsqpos, SEEK_SET);
148 put_byte(pb, 0); /* start time */
149 put_byte(pb, 1); /* (channel << 6) | wavenum */
150 gatetime = size * 500 / s->streams[0]->codec->sample_rate;
151 put_varlength(pb, gatetime); /* duration */
154 put_varlength(pb, gatetime); /* start time */
155 put_buffer(pb, "\xff\x00", 2); /* nop */
157 /* "end of sequence" */
158 put_buffer(pb, "\x00\x00\x00\x00", 4);
160 url_fseek(pb, pos, SEEK_SET);
162 put_flush_packet(pb);
166 #endif //CONFIG_MUXERS
168 static int mmf_probe(AVProbeData *p)
170 /* check file header */
171 if (p->buf_size <= 32)
173 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
174 p->buf[2] == 'M' && p->buf[3] == 'D' &&
175 p->buf[8] == 'C' && p->buf[9] == 'N' &&
176 p->buf[10] == 'T' && p->buf[11] == 'I')
177 return AVPROBE_SCORE_MAX;
183 static int mmf_read_header(AVFormatContext *s,
184 AVFormatParameters *ap)
186 MMFContext *mmf = s->priv_data;
188 ByteIOContext *pb = &s->pb;
190 offset_t file_size, size;
194 if (tag != MKTAG('M', 'M', 'M', 'D'))
196 file_size = get_be32(pb);
198 /* Skip some unused chunks that may or may not be present */
199 for(;; url_fseek(pb, size, SEEK_CUR)) {
202 if(tag == MKTAG('C','N','T','I')) continue;
203 if(tag == MKTAG('O','P','D','A')) continue;
207 /* Tag = "ATRx", where "x" = track number */
208 if ((tag & 0xffffff) == MKTAG('M', 'T', 'R', 0)) {
209 av_log(s, AV_LOG_ERROR, "MIDI like format found, unsupported\n");
212 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
213 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
217 get_byte(pb); /* format type */
218 get_byte(pb); /* sequence type */
219 params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */
220 rate = mmf_rate(params & 0x0f);
222 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
225 get_byte(pb); /* wave base bit */
226 get_byte(pb); /* time base d */
227 get_byte(pb); /* time base g */
229 /* Skip some unused chunks that may or may not be present */
230 for(;; url_fseek(pb, size, SEEK_CUR)) {
233 if(tag == MKTAG('A','t','s','q')) continue;
234 if(tag == MKTAG('A','s','p','I')) continue;
238 /* Make sure it's followed by an Awa chunk, aka wave data */
239 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
240 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
243 mmf->data_size = size;
245 st = av_new_stream(s, 0);
247 return AVERROR_NOMEM;
249 st->codec->codec_type = CODEC_TYPE_AUDIO;
250 st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA;
251 st->codec->sample_rate = rate;
252 st->codec->channels = 1;
253 st->codec->bits_per_sample = 4;
254 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample;
256 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
261 #define MAX_SIZE 4096
263 static int mmf_read_packet(AVFormatContext *s,
266 MMFContext *mmf = s->priv_data;
270 if (url_feof(&s->pb))
275 if(size > mmf->data_size)
276 size = mmf->data_size;
281 if (av_new_packet(pkt, size))
283 pkt->stream_index = 0;
285 ret = get_buffer(&s->pb, pkt->data, pkt->size);
289 mmf->data_size -= ret;
295 static int mmf_read_close(AVFormatContext *s)
300 static int mmf_read_seek(AVFormatContext *s,
301 int stream_index, int64_t timestamp, int flags)
303 return pcm_read_seek(s, stream_index, timestamp, flags);
306 #ifdef CONFIG_MMF_DEMUXER
307 AVInputFormat mmf_demuxer = {
318 #ifdef CONFIG_MMF_MUXER
319 AVOutputFormat mmf_muxer = {
322 "application/vnd.smaf",
325 CODEC_ID_ADPCM_YAMAHA,