changing AVCodecContext codec -> *codec in AVStream so additions to AVCodecContext...
[libav.git] / libavformat / mmf.c
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93a23627
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1/*
2 * Yamaha SMAF format
3 * Copyright (c) 2005 Vidar Madsen
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19#include "avformat.h"
20#include "avi.h"
21
22#ifdef CONFIG_ENCODERS
23typedef struct {
24 offset_t atrpos, atsqpos, awapos;
25 offset_t data_size;
26} MMFContext;
27
28static int mmf_rates[] = { 4000, 8000, 11025, 22050, 44100 };
29
30static int mmf_rate_code(int rate)
31{
32 int i;
33 for(i = 0; i < 5; i++)
34 if(mmf_rates[i] == rate)
35 return i;
36 return -1;
37}
38
39static int mmf_rate(int code)
40{
41 if((code < 0) || (code > 4))
42 return -1;
43 return mmf_rates[code];
44}
45
46/* Copy of end_tag() from avienc.c, but for big-endian chunk size */
47static void end_tag_be(ByteIOContext *pb, offset_t start)
48{
49 offset_t pos;
50
51 pos = url_ftell(pb);
52 url_fseek(pb, start - 4, SEEK_SET);
53 put_be32(pb, (uint32_t)(pos - start));
54 url_fseek(pb, pos, SEEK_SET);
55}
56
57static int mmf_write_header(AVFormatContext *s)
58{
59 MMFContext *mmf = s->priv_data;
60 ByteIOContext *pb = &s->pb;
61 offset_t pos;
62 int rate;
63
01f4895c 64 rate = mmf_rate_code(s->streams[0]->codec->sample_rate);
93a23627 65 if(rate < 0) {
01f4895c 66 av_log(s, AV_LOG_ERROR, "Unsupported sample rate %d\n", s->streams[0]->codec->sample_rate);
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67 return -1;
68 }
69
70 put_tag(pb, "MMMD");
71 put_be32(pb, 0);
72 pos = start_tag(pb, "CNTI");
73 put_byte(pb, 0); /* class */
74 put_byte(pb, 0); /* type */
75 put_byte(pb, 0); /* code type */
76 put_byte(pb, 0); /* status */
77 put_byte(pb, 0); /* counts */
78 put_tag(pb, "VN:libavcodec,"); /* metadata ("ST:songtitle,VN:version,...") */
79 end_tag_be(pb, pos);
80
81 put_buffer(pb, "ATR\x00", 4);
82 put_be32(pb, 0);
83 mmf->atrpos = url_ftell(pb);
84 put_byte(pb, 0); /* format type */
85 put_byte(pb, 0); /* sequence type */
86 put_byte(pb, (0 << 7) | (1 << 4) | rate); /* (channel << 7) | (format << 4) | rate */
87 put_byte(pb, 0); /* wave base bit */
88 put_byte(pb, 2); /* time base d */
89 put_byte(pb, 2); /* time base g */
90
91 put_tag(pb, "Atsq");
92 put_be32(pb, 16);
93 mmf->atsqpos = url_ftell(pb);
94 /* Will be filled on close */
95 put_buffer(pb, "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 16);
96
97 mmf->awapos = start_tag(pb, "Awa\x01");
98
01f4895c 99 av_set_pts_info(s->streams[0], 64, 1, s->streams[0]->codec->sample_rate);
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100
101 put_flush_packet(pb);
102
103 return 0;
104}
105
106static int mmf_write_packet(AVFormatContext *s, AVPacket *pkt)
107{
108 ByteIOContext *pb = &s->pb;
109 put_buffer(pb, pkt->data, pkt->size);
110 return 0;
111}
112
113/* Write a variable-length symbol */
114static void put_varlength(ByteIOContext *pb, int val)
115{
116 if(val < 128)
117 put_byte(pb, val);
118 else {
119 val -= 128;
120 put_byte(pb, 0x80 | val >> 7);
121 put_byte(pb, 0x7f & val);
122 }
123}
124
125static int mmf_write_trailer(AVFormatContext *s)
126{
127 ByteIOContext *pb = &s->pb;
128 MMFContext *mmf = s->priv_data;
129 offset_t pos, size;
130 int gatetime;
131
132 if (!url_is_streamed(&s->pb)) {
133 /* Fill in length fields */
134 end_tag_be(pb, mmf->awapos);
135 end_tag_be(pb, mmf->atrpos);
136 end_tag_be(pb, 8);
137
138 pos = url_ftell(pb);
139 size = pos - mmf->awapos;
140
141 /* Fill Atsq chunk */
142 url_fseek(pb, mmf->atsqpos, SEEK_SET);
143
144 /* "play wav" */
145 put_byte(pb, 0); /* start time */
146 put_byte(pb, 1); /* (channel << 6) | wavenum */
01f4895c 147 gatetime = size * 500 / s->streams[0]->codec->sample_rate;
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148 put_varlength(pb, gatetime); /* duration */
149
150 /* "nop" */
151 put_varlength(pb, gatetime); /* start time */
152 put_buffer(pb, "\xff\x00", 2); /* nop */
153
154 /* "end of sequence" */
155 put_buffer(pb, "\x00\x00\x00\x00", 4);
156
157 url_fseek(pb, pos, SEEK_SET);
158
159 put_flush_packet(pb);
160 }
161 return 0;
162}
163#endif //CONFIG_ENCODERS
164
165static int mmf_probe(AVProbeData *p)
166{
167 /* check file header */
168 if (p->buf_size <= 32)
169 return 0;
170 if (p->buf[0] == 'M' && p->buf[1] == 'M' &&
171 p->buf[2] == 'M' && p->buf[3] == 'D' &&
172 p->buf[8] == 'C' && p->buf[9] == 'N' &&
173 p->buf[10] == 'T' && p->buf[11] == 'I')
174 return AVPROBE_SCORE_MAX;
175 else
176 return 0;
177}
178
179/* mmf input */
180static int mmf_read_header(AVFormatContext *s,
181 AVFormatParameters *ap)
182{
183 MMFContext *mmf = s->priv_data;
184 unsigned int tag;
185 ByteIOContext *pb = &s->pb;
186 AVStream *st;
187 offset_t file_size, size;
188 int rate, params;
189
190 tag = get_le32(pb);
191 if (tag != MKTAG('M', 'M', 'M', 'D'))
192 return -1;
193 file_size = get_be32(pb);
194
195 /* Skip some unused chunks that may or may not be present */
196 for(;; url_fseek(pb, size, SEEK_CUR)) {
197 tag = get_le32(pb);
198 size = get_be32(pb);
199 if(tag == MKTAG('C','N','T','I')) continue;
200 if(tag == MKTAG('O','P','D','A')) continue;
201 break;
202 }
203
204 /* Tag = "ATRx", where "x" = track number */
205 if ((tag & 0xffffff) != MKTAG('A', 'T', 'R', 0)) {
206 av_log(s, AV_LOG_ERROR, "Unsupported SMAF chunk %08x\n", tag);
207 return -1;
208 }
209
210 get_byte(pb); /* format type */
211 get_byte(pb); /* sequence type */
212 params = get_byte(pb); /* (channel << 7) | (format << 4) | rate */
213 rate = mmf_rate(params & 0x0f);
214 if(rate < 0) {
215 av_log(s, AV_LOG_ERROR, "Invalid sample rate\n");
216 return -1;
217 }
218 get_byte(pb); /* wave base bit */
219 get_byte(pb); /* time base d */
220 get_byte(pb); /* time base g */
221
222 /* Skip some unused chunks that may or may not be present */
223 for(;; url_fseek(pb, size, SEEK_CUR)) {
224 tag = get_le32(pb);
225 size = get_be32(pb);
226 if(tag == MKTAG('A','t','s','q')) continue;
227 if(tag == MKTAG('A','s','p','I')) continue;
228 break;
229 }
230
231 /* Make sure it's followed by an Awa chunk, aka wave data */
232 if ((tag & 0xffffff) != MKTAG('A', 'w', 'a', 0)) {
233 av_log(s, AV_LOG_ERROR, "Unexpected SMAF chunk %08x\n", tag);
234 return -1;
235 }
236 mmf->data_size = size;
237
238 st = av_new_stream(s, 0);
239 if (!st)
240 return AVERROR_NOMEM;
241
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242 st->codec->codec_type = CODEC_TYPE_AUDIO;
243 st->codec->codec_id = CODEC_ID_ADPCM_YAMAHA;
244 st->codec->sample_rate = rate;
245 st->codec->channels = 1;
246 st->codec->bits_per_sample = 4;
247 st->codec->bit_rate = st->codec->sample_rate * st->codec->bits_per_sample;
93a23627 248
01f4895c 249 av_set_pts_info(st, 64, 1, st->codec->sample_rate);
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250
251 return 0;
252}
253
254#define MAX_SIZE 4096
255
256static int mmf_read_packet(AVFormatContext *s,
257 AVPacket *pkt)
258{
259 MMFContext *mmf = s->priv_data;
260 AVStream *st;
261 int ret, size;
262
263 if (url_feof(&s->pb))
264 return AVERROR_IO;
265 st = s->streams[0];
266
267 size = MAX_SIZE;
268 if(size > mmf->data_size)
269 size = mmf->data_size;
270
271 if(!size)
272 return AVERROR_IO;
273
274 if (av_new_packet(pkt, size))
275 return AVERROR_IO;
276 pkt->stream_index = 0;
277
278 ret = get_buffer(&s->pb, pkt->data, pkt->size);
279 if (ret < 0)
280 av_free_packet(pkt);
281
282 mmf->data_size -= ret;
283
284 pkt->size = ret;
285 return ret;
286}
287
288static int mmf_read_close(AVFormatContext *s)
289{
290 return 0;
291}
292
293static int mmf_read_seek(AVFormatContext *s,
294 int stream_index, int64_t timestamp, int flags)
295{
296 return pcm_read_seek(s, stream_index, timestamp, flags);
297}
298
299
300static AVInputFormat mmf_iformat = {
301 "mmf",
302 "mmf format",
303 sizeof(MMFContext),
304 mmf_probe,
305 mmf_read_header,
306 mmf_read_packet,
307 mmf_read_close,
308 mmf_read_seek,
309};
310
311#ifdef CONFIG_ENCODERS
312static AVOutputFormat mmf_oformat = {
313 "mmf",
314 "mmf format",
315 "application/vnd.smaf",
316 "mmf",
317 sizeof(MMFContext),
318 CODEC_ID_ADPCM_YAMAHA,
319 CODEC_ID_NONE,
320 mmf_write_header,
321 mmf_write_packet,
322 mmf_write_trailer,
323};
324#endif //CONFIG_ENCODERS
325
326int ff_mmf_init(void)
327{
328 av_register_input_format(&mmf_iformat);
329#ifdef CONFIG_ENCODERS
330 av_register_output_format(&mmf_oformat);
331#endif //CONFIG_ENCODERS
332 return 0;
333}
334