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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2006 Antonius Hellmann
* Copyright (C) 2006-2013 Michael Sevakis
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include <inttypes.h>
#include "codeclib.h"
CODEC_ENC_HEADER
struct riff_header
{
uint8_t riff_id[4]; /* 00h - "RIFF" */
uint32_t riff_size; /* 04h - sz following headers + data_size */
/* format header */
uint8_t format[4]; /* 08h - "WAVE" */
uint8_t format_id[4]; /* 0Ch - "fmt " */
uint32_t format_size; /* 10h - 16 for PCM (sz format data) */
/* format data */
uint16_t audio_format; /* 14h - 1=PCM */
uint16_t num_channels; /* 16h - 1=M, 2=S, etc. */
uint32_t sample_rate; /* 18h - HZ */
uint32_t byte_rate; /* 1Ch - num_channels*sample_rate*bits_per_sample/8 */
uint16_t block_align; /* 20h - num_channels*bits_per_samples/8 */
uint16_t bits_per_sample; /* 22h - 8=8 bits, 16=16 bits, etc. */
/* Not for audio_format=1 (PCM) */
/* uint16_t extra_param_size; 24h - size of extra data */
/* uint8_t extra_params[extra_param_size]; */
/* data header */
uint8_t data_id[4]; /* 24h - "data" */
uint32_t data_size; /* 28h - num_samples*num_channels*bits_per_sample/8 */
/* uint8_t data[data_size]; 2Ch - actual sound data */
} __attribute__((packed));
#define RIFF_FMT_HEADER_SIZE 12 /* format -> format_size */
#define RIFF_FMT_DATA_SIZE 16 /* audio_format -> bits_per_sample */
#define RIFF_DATA_HEADER_SIZE 8 /* data_id -> data_size */
#define PCM_DEPTH_BYTES 2
#define PCM_DEPTH_BITS 16
#define PCM_SAMP_PER_CHUNK 2048
static int num_channels;
static uint32_t sample_rate;
static size_t frame_size;
static size_t data_size;
static const struct riff_header riff_template_header =
{
/* "RIFF" header */
{ 'R', 'I', 'F', 'F' }, /* riff_id */
0, /* riff_size (*) */
/* format header */
{ 'W', 'A', 'V', 'E' }, /* format */
{ 'f', 'm', 't', ' ' }, /* format_id */
htole32(16), /* format_size */
/* format data */
htole16(1), /* audio_format */
0, /* num_channels (*) */
0, /* sample_rate (*) */
0, /* byte_rate (*) */
0, /* block_align (*) */
htole16(PCM_DEPTH_BITS), /* bits_per_sample */
/* data header */
{ 'd', 'a', 't', 'a' }, /* data_id */
0 /* data_size (*) */
/* (*) updated when finalizing stream */
};
static inline void frame_htole(uint32_t *p, size_t size)
{
#ifdef ROCKBOX_BIG_ENDIAN
/* Byte-swap samples, stereo or mono */
do
{
uint32_t t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
t = swap_odd_even32(*p); *p++ = t;
}
while (size -= 8 * 2 * PCM_DEPTH_BYTES);
#endif /* ROCKBOX_BIG_ENDIAN */
(void)p; (void)size;
}
static int on_stream_data(struct enc_chunk_data *data)
{
size_t size = data->hdr.size;
if (ci->enc_stream_write(data->data, size) != (ssize_t)size)
return -1;
data_size += size;
return 0;
}
static int on_stream_start(void)
{
/* reset sample count */
data_size = 0;
/* write template header */
if (ci->enc_stream_write(&riff_template_header, sizeof (struct riff_header))
!= sizeof (struct riff_header))
return -1;
return 0;
}
static int on_stream_end(union enc_chunk_hdr *hdr)
{
/* update template header */
struct riff_header riff;
if (hdr->err)
{
/* Called for stream error; get correct data size */
ssize_t size = ci->enc_stream_lseek(0, SEEK_END);
if (size > (ssize_t)sizeof (riff))
data_size = size - sizeof (riff);
}
if (ci->enc_stream_lseek(0, SEEK_SET) ||
ci->enc_stream_read(&riff, sizeof (riff)) != sizeof (riff))
return -1;
/* "RIFF" header */
riff.riff_size = htole32(RIFF_FMT_HEADER_SIZE + RIFF_FMT_DATA_SIZE
+ RIFF_DATA_HEADER_SIZE + data_size);
/* format data */
riff.num_channels = htole16(num_channels);
riff.sample_rate = htole32(sample_rate);
riff.byte_rate = htole32(sample_rate*num_channels*PCM_DEPTH_BYTES);
riff.block_align = htole16(num_channels*PCM_DEPTH_BYTES);
/* data header */
riff.data_size = htole32(data_size);
if (ci->enc_stream_lseek(0, SEEK_SET) != 0)
return -2;
if (ci->enc_stream_write(&riff, sizeof (riff)) != sizeof (riff))
return -3;
return 0;
}
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
return CODEC_OK;
(void)reason;
}
/* this is called for each file to process */
enum codec_status ICODE_ATTR codec_run(void)
{
enum { GETBUF_ENC, GETBUF_PCM } getbuf = GETBUF_ENC;
struct enc_chunk_data *data = NULL;
/* main encoding loop */
while (1)
{
enum codec_command_action action = ci->get_command(NULL);
if (action != CODEC_ACTION_NULL)
break;
/* First obtain output buffer; when available, get PCM data */
switch (getbuf)
{
case GETBUF_ENC:
if (!(data = ci->enc_encbuf_get_buffer(frame_size)))
continue;
getbuf = GETBUF_PCM;
case GETBUF_PCM:
if (!ci->enc_pcmbuf_read(data->data, PCM_SAMP_PER_CHUNK))
continue;
getbuf = GETBUF_ENC;
}
data->hdr.size = frame_size;
data->pcm_count = PCM_SAMP_PER_CHUNK;
frame_htole((uint32_t *)data->data, frame_size);
ci->enc_pcmbuf_advance(PCM_SAMP_PER_CHUNK);
ci->enc_encbuf_finish_buffer();
}
return CODEC_OK;
}
/* this is called by recording system */
int ICODE_ATTR enc_callback(enum enc_callback_reason reason,
void *params)
{
if (LIKELY(reason == ENC_CB_STREAM))
{
switch (((union enc_chunk_hdr *)params)->type)
{
case CHUNK_T_DATA:
return on_stream_data(params);
case CHUNK_T_STREAM_START:
return on_stream_start();
case CHUNK_T_STREAM_END:
return on_stream_end(params);
}
}
else if (reason == ENC_CB_INPUTS)
{
struct enc_inputs *inputs = params;
sample_rate = inputs->sample_rate;
num_channels = inputs->num_channels;
frame_size = PCM_SAMP_PER_CHUNK*PCM_DEPTH_BYTES*num_channels;
}
return 0;
}
|
