1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2002 Björn Stenberg
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "codec.h"
#include <codecs/libFLAC/include/FLAC/seekable_stream_decoder.h>
#include "playback.h"
#include "lib/codeclib.h"
#define FLAC_MAX_SUPPORTED_BLOCKSIZE 4608
#define FLAC_MAX_SUPPORTED_CHANNELS 2
static struct codec_api* rb;
static uint32_t samplesdone;
/* Called when the FLAC decoder needs some FLAC data to decode */
FLAC__SeekableStreamDecoderReadStatus flac_read_handler(const FLAC__SeekableStreamDecoder *dec,
FLAC__byte buffer[], unsigned *bytes, void *data)
{ struct codec_api* ci = (struct codec_api*)data;
(void)dec;
*bytes=(unsigned)(ci->read_filebuf(buffer,*bytes));
if (*bytes==0) {
return FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM;
} else {
return FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
}
}
static unsigned char pcmbuf[FLAC_MAX_SUPPORTED_BLOCKSIZE*FLAC_MAX_SUPPORTED_CHANNELS*2] IDATA_ATTR;
/* Called when the FLAC decoder has some decoded PCM data to write */
FLAC__StreamDecoderWriteStatus flac_write_handler(const FLAC__SeekableStreamDecoder *dec,
const FLAC__Frame *frame,
const FLAC__int32 * const buf[],
void *data)
{
struct codec_api* ci = (struct codec_api*)data;
(void)dec;
unsigned int c_samp, c_chan, d_samp;
uint32_t data_size = frame->header.blocksize * frame->header.channels * 2; /* Assume 16-bit words */
uint32_t samples = frame->header.blocksize;
int yieldcounter = 0;
if (samples*frame->header.channels > (FLAC_MAX_SUPPORTED_BLOCKSIZE*FLAC_MAX_SUPPORTED_CHANNELS)) {
// ERROR!!!
DEBUGF("ERROR: samples*frame->header.channels=%d\n",samples*frame->header.channels);
return(FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE);
}
(void)dec;
for(c_samp = d_samp = 0; c_samp < samples; c_samp++) {
for(c_chan = 0; c_chan < frame->header.channels; c_chan++, d_samp++) {
pcmbuf[d_samp*2] = (buf[c_chan][c_samp]&0xff00)>>8;
pcmbuf[(d_samp*2)+1] = buf[c_chan][c_samp]&0xff;
if (yieldcounter++ == 100) {
rb->yield();
yieldcounter = 0;
}
}
}
samplesdone+=samples;
ci->set_elapsed(samplesdone/(ci->id3->frequency/1000));
rb->yield();
while (!ci->audiobuffer_insert(pcmbuf, data_size))
rb->yield();
return FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE;
}
void flac_metadata_handler(const FLAC__SeekableStreamDecoder *dec,
const FLAC__StreamMetadata *meta, void *data)
{
/* Ignore metadata for now... */
(void)dec;
(void)meta;
(void)data;
}
void flac_error_handler(const FLAC__SeekableStreamDecoder *dec,
FLAC__StreamDecoderErrorStatus status, void *data)
{
(void)dec;
(void)status;
(void)data;
}
FLAC__SeekableStreamDecoderSeekStatus flac_seek_handler (const FLAC__SeekableStreamDecoder *decoder,
FLAC__uint64 absolute_byte_offset,
void *client_data)
{
(void)decoder;
struct codec_api* ci = (struct codec_api*)client_data;
if (ci->seek_buffer(absolute_byte_offset)) {
return(FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK);
} else {
return(FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR);
}
}
FLAC__SeekableStreamDecoderTellStatus flac_tell_handler (const FLAC__SeekableStreamDecoder *decoder,
FLAC__uint64 *absolute_byte_offset, void *client_data)
{
struct codec_api* ci = (struct codec_api*)client_data;
(void)decoder;
*absolute_byte_offset=ci->curpos;
return(FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK);
}
FLAC__SeekableStreamDecoderLengthStatus flac_length_handler (const FLAC__SeekableStreamDecoder *decoder,
FLAC__uint64 *stream_length, void *client_data)
{
struct codec_api* ci = (struct codec_api*)client_data;
(void)decoder;
*stream_length=ci->filesize;
return(FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK);
}
FLAC__bool flac_eof_handler (const FLAC__SeekableStreamDecoder *decoder,
void *client_data)
{
struct codec_api* ci = (struct codec_api*)client_data;
(void)decoder;
if (ci->curpos >= ci->filesize) {
return(true);
} else {
return(false);
}
}
#ifndef SIMULATOR
extern char iramcopy[];
extern char iramstart[];
extern char iramend[];
#endif
/* this is the codec entry point */
enum codec_status codec_start(struct codec_api* api, void* parm)
{
struct codec_api* ci = api;
FLAC__SeekableStreamDecoder* flacDecoder;
/* Generic codec initialisation */
TEST_CODEC_API(api);
/* if you are using a global api pointer, don't forget to copy it!
otherwise you will get lovely "I04: IllInstr" errors... :-) */
rb = api;
#ifndef SIMULATOR
rb->memcpy(iramstart, iramcopy, iramend-iramstart);
#endif
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*10));
ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(1024*512));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*128));
next_track:
if (codec_init(api)) {
return CODEC_ERROR;
}
/* Create a decoder instance */
flacDecoder=FLAC__seekable_stream_decoder_new();
/* Set up the decoder and the callback functions - this must be done before init */
/* The following are required for stream_decoder and higher */
FLAC__seekable_stream_decoder_set_client_data(flacDecoder,ci);
FLAC__seekable_stream_decoder_set_write_callback(flacDecoder, flac_write_handler);
FLAC__seekable_stream_decoder_set_read_callback(flacDecoder, flac_read_handler);
FLAC__seekable_stream_decoder_set_metadata_callback(flacDecoder, flac_metadata_handler);
FLAC__seekable_stream_decoder_set_error_callback(flacDecoder, flac_error_handler);
FLAC__seekable_stream_decoder_set_metadata_respond(flacDecoder, FLAC__METADATA_TYPE_STREAMINFO);
/* The following are only for the seekable_stream_decoder */
FLAC__seekable_stream_decoder_set_seek_callback(flacDecoder, flac_seek_handler);
FLAC__seekable_stream_decoder_set_tell_callback(flacDecoder, flac_tell_handler);
FLAC__seekable_stream_decoder_set_length_callback(flacDecoder, flac_length_handler);
FLAC__seekable_stream_decoder_set_eof_callback(flacDecoder, flac_eof_handler);
/* QUESTION: What do we do when the init fails? */
if (FLAC__seekable_stream_decoder_init(flacDecoder)) {
return CODEC_ERROR;
}
/* The first thing to do is to parse the metadata */
FLAC__seekable_stream_decoder_process_until_end_of_metadata(flacDecoder);
samplesdone=0;
ci->set_elapsed(0);
/* The main decoder loop */
while (FLAC__seekable_stream_decoder_get_state(flacDecoder)!=FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM) {
rb->yield();
if (ci->stop_codec || ci->reload_codec) {
break;
}
if (ci->seek_time) {
int sample_loc;
sample_loc = ci->seek_time/1000 * ci->id3->frequency;
if (FLAC__seekable_stream_decoder_seek_absolute(flacDecoder,sample_loc)) {
samplesdone=sample_loc;
ci->set_elapsed(samplesdone/(ci->id3->frequency/1000));
}
ci->seek_time = 0;
}
FLAC__seekable_stream_decoder_process_single(flacDecoder);
}
/* Flush the libFLAC buffers */
FLAC__seekable_stream_decoder_finish(flacDecoder);
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
|
