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
249
250
251
252
253
254
255
256
257
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 Dave Chapman
*
* 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/libmad/mad.h>
#include "playback.h"
#include "dsp.h"
#include "mp3data.h"
#include "lib/codeclib.h"
struct mad_stream Stream IDATA_ATTR;
struct mad_frame Frame IDATA_ATTR;
struct mad_synth Synth IDATA_ATTR;
mad_timer_t Timer;
/* The following function is used inside libmad - let's hope it's never
called.
*/
void abort(void) {
}
#define INPUT_CHUNK_SIZE 8192
#define OUTPUT_BUFFER_SIZE 65536 /* Must be an integer multiple of 4. */
unsigned char OutputBuffer[OUTPUT_BUFFER_SIZE];
unsigned char *OutputPtr;
unsigned char *GuardPtr = NULL;
const unsigned char *OutputBufferEnd = OutputBuffer + OUTPUT_BUFFER_SIZE;
mad_fixed_t mad_frame_overlap[2][32][18] IDATA_ATTR;
unsigned char mad_main_data[MAD_BUFFER_MDLEN] IDATA_ATTR;
/* TODO: what latency does layer 1 have? */
int mpeg_latency[3] = { 0, 481, 529 };
#ifdef USE_IRAM
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)
{
struct codec_api *ci = api;
struct mp3info *info;
int Status = 0;
size_t size;
int file_end;
char *InputBuffer;
unsigned int samplecount;
unsigned int samplesdone;
bool first_frame;
int stop_skip, start_skip;
int current_stereo_mode = -1;
int frequency_divider;
/* Generic codec inititialisation */
TEST_CODEC_API(api);
#ifdef USE_IRAM
ci->memcpy(iramstart, iramcopy, iramend - iramstart);
#endif
/* This function sets up the buffers and reads the file into RAM */
if (codec_init(api)) {
return CODEC_ERROR;
}
/* Create a decoder instance */
ci->configure(CODEC_SET_FILEBUF_LIMIT, (int *)(1024*1024*2));
ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*16));
ci->configure(DSP_SET_CLIP_MIN, (int *)-MAD_F_ONE);
ci->configure(DSP_SET_CLIP_MAX, (int *)(MAD_F_ONE - 1));
ci->configure(DSP_SET_SAMPLE_DEPTH, (int *)(MAD_F_FRACBITS));
ci->configure(DSP_DITHER, (bool *)false);
ci->configure(CODEC_DSP_ENABLE, (bool *)true);
ci->memset(&Stream, 0, sizeof(struct mad_stream));
ci->memset(&Frame, 0, sizeof(struct mad_frame));
ci->memset(&Synth, 0, sizeof(struct mad_synth));
ci->memset(&Timer, 0, sizeof(mad_timer_t));
mad_stream_init(&Stream);
mad_frame_init(&Frame);
mad_synth_init(&Synth);
mad_timer_reset(&Timer);
/* We do this so libmad doesn't try to call codec_calloc() */
memset(mad_frame_overlap, 0, sizeof(mad_frame_overlap));
Frame.overlap = &mad_frame_overlap;
Stream.main_data = &mad_main_data;
/* This label might need to be moved above all the init code, but I don't
think reiniting the codec is necessary for MPEG. It might even be unwanted
for gapless playback */
next_track:
info = ci->mp3data;
first_frame = false;
file_end = 0;
OutputPtr = OutputBuffer;
while (!*ci->taginfo_ready)
ci->yield();
frequency_divider = ci->id3->frequency / 100;
ci->configure(DSP_SET_FREQUENCY, (int *)ci->id3->frequency);
ci->request_buffer(&size, ci->id3->first_frame_offset);
ci->advance_buffer(size);
if (info->enc_delay >= 0 && info->enc_padding >= 0) {
stop_skip = info->enc_padding - mpeg_latency[info->layer];
if (stop_skip < 0) stop_skip = 0;
start_skip = info->enc_delay + mpeg_latency[info->layer];
} else {
stop_skip = 0;
/* We want to skip this amount anyway */
start_skip = mpeg_latency[info->layer];
}
/* NOTE: currently this doesn't work, the below calculated samples_count
seems to be right, but sometimes libmad just can't supply us with
all the data we need... */
if (info->frame_count) {
/* TODO: 1152 is the frame size in samples for MPEG1 layer 2 and layer 3,
it's probably not correct at all for MPEG2 and layer 1 */
samplecount = info->frame_count*1152 - (start_skip + stop_skip);
samplesdone = ci->id3->elapsed * frequency_divider / 10;
} else {
samplecount = ci->id3->length * frequency_divider / 10;
samplesdone = ci->id3->elapsed * frequency_divider / 10;
}
/* This is the decoding loop. */
while (1) {
ci->yield();
if (ci->stop_codec || ci->reload_codec) {
break ;
}
if (ci->seek_time) {
unsigned int sample_loc;
int newpos;
sample_loc = ci->seek_time * frequency_divider / 10;
newpos = ci->mp3_get_filepos(ci->seek_time-1);
if (sample_loc >= samplecount + samplesdone)
break ;
if (ci->seek_buffer(newpos)) {
samplecount += samplesdone - sample_loc;
samplesdone = sample_loc;
}
ci->seek_time = 0;
}
/* Lock buffers */
if (Stream.error == 0) {
InputBuffer = ci->request_buffer(&size, INPUT_CHUNK_SIZE);
if (size == 0 || InputBuffer == NULL)
break ;
mad_stream_buffer(&Stream, InputBuffer, size);
}
if(mad_frame_decode(&Frame,&Stream))
{
if (Stream.error == MAD_FLAG_INCOMPLETE || Stream.error == MAD_ERROR_BUFLEN) {
// ci->splash(HZ*1, true, "Incomplete");
/* This makes the codec to support partially corrupted files too. */
if (file_end == 30)
break ;
/* Fill the buffer */
Stream.error = 0;
file_end++;
continue ;
}
else if(MAD_RECOVERABLE(Stream.error))
{
if(Stream.error!=MAD_ERROR_LOSTSYNC || Stream.this_frame!=GuardPtr)
{
// rb->splash(HZ*1, true, "Recoverable...!");
}
continue;
}
else if(Stream.error==MAD_ERROR_BUFLEN) {
//rb->splash(HZ*1, true, "Buflen error");
break ;
} else {
//rb->splash(HZ*1, true, "Unrecoverable error");
Status=1;
break;
}
}
if (Stream.next_frame)
ci->advance_buffer_loc((void *)Stream.next_frame);
file_end = false;
/* ?? Do we need the timer module? */
// mad_timer_add(&Timer,Frame.header.duration);
mad_synth_frame(&Synth,&Frame);
/* Convert MAD's numbers to an array of 16-bit LE signed integers */
/* We skip start_skip number of samples here, this should only happen for
very first frame in the stream. */
/* TODO: possible for start_skip to exceed one frames worth of samples? */
if (MAD_NCHANNELS(&Frame.header) == 2) {
if (current_stereo_mode != STEREO_NONINTERLEAVED) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_NONINTERLEAVED);
current_stereo_mode = STEREO_NONINTERLEAVED;
}
ci->audiobuffer_insert_split(&Synth.pcm.samples[0][start_skip],
&Synth.pcm.samples[1][start_skip],
(Synth.pcm.length - start_skip) * 4);
} else {
if (current_stereo_mode != STEREO_MONO) {
ci->configure(DSP_SET_STEREO_MODE, (int *)STEREO_MONO);
current_stereo_mode = STEREO_MONO;
}
ci->audiobuffer_insert((char *)&Synth.pcm.samples[0][start_skip],
(Synth.pcm.length - start_skip) * 4);
}
start_skip = 0; /* not very elegant, and might want to keep this value */
samplesdone += Synth.pcm.length;
samplecount -= Synth.pcm.length;
ci->set_elapsed(samplesdone / (frequency_divider / 10));
}
Stream.error = 0;
if (ci->request_next_track())
goto next_track;
return CODEC_OK;
}
|
