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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2009 Mohamed Tarek
*
* 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 "codeclib.h"
#include "librm/rm.h"
#include "libfaad/common.h"
#include "libfaad/structs.h"
#include "libfaad/decoder.h"
#include "libfaad/output.h"
CODEC_HEADER
static void init_rm(RMContext *rmctx)
{
memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext));
}
static RMContext rmctx;
static RMPacket pkt;
/* this is the codec entry point */
enum codec_status codec_main(enum codec_entry_call_reason reason)
{
if (reason == CODEC_LOAD) {
/* Generic codec initialisation */
ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED);
ci->configure(DSP_SET_SAMPLE_DEPTH, 29);
}
return CODEC_OK;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
static NeAACDecFrameInfo frame_info;
NeAACDecHandle decoder;
size_t n;
void *ret;
unsigned int i;
unsigned char* buffer;
int err, consumed, pkt_offset, skipped = 0;
uint32_t s = 0; /* sample rate */
unsigned char c = 0; /* channels */
int playback_on = -1;
size_t resume_offset;
intptr_t param;
enum codec_command_action action = CODEC_ACTION_NULL;
if (codec_init()) {
DEBUGF("FAAD: Codec init error\n");
return CODEC_ERROR;
}
resume_offset = ci->id3->offset;
ci->memset(&rmctx,0,sizeof(RMContext));
ci->memset(&pkt,0,sizeof(RMPacket));
ci->seek_buffer(0);
init_rm(&rmctx);
ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency);
codec_set_replaygain(ci->id3);
/* initialise the sound converter */
decoder = NeAACDecOpen();
if (!decoder) {
DEBUGF("FAAD: Decode open error\n");
return CODEC_ERROR;
}
NeAACDecConfigurationPtr conf = NeAACDecGetCurrentConfiguration(decoder);
conf->outputFormat = FAAD_FMT_16BIT; /* irrelevant, we don't convert */
NeAACDecSetConfiguration(decoder, conf);
decoder->config.defObjectType = rmctx.codec_extradata[0];
decoder->config.defSampleRate = rmctx.sample_rate;
err = NeAACDecInit(decoder, NULL, 0, &s, &c);
if (err) {
DEBUGF("FAAD: DecInit: %d, %d\n", err, decoder->object_type);
return CODEC_ERROR;
}
/* check for a mid-track resume and force a seek time accordingly */
if(resume_offset > rmctx.data_offset + DATA_HEADER_SIZE) {
resume_offset -= rmctx.data_offset + DATA_HEADER_SIZE;
/* put number of subpackets to skip in resume_offset */
resume_offset /= (rmctx.block_align + PACKET_HEADER_SIZE);
param = (int)resume_offset * ((rmctx.block_align * 8 * 1000)/rmctx.bit_rate);
action = CODEC_ACTION_SEEK_TIME;
}
ci->set_elapsed(0);
ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
/* The main decoding loop */
while (1) {
if (action == CODEC_ACTION_NULL)
action = ci->get_command(¶m);
if (action == CODEC_ACTION_HALT)
break;
if (action == CODEC_ACTION_SEEK_TIME) {
/* Do not allow seeking beyond the file's length */
if ((unsigned) param > ci->id3->length) {
ci->set_elapsed(ci->id3->length);
ci->seek_complete();
break;
}
ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE);
/* Seek to the start of the track */
if (param == 0) {
ci->set_elapsed(0);
ci->seek_complete();
action = CODEC_ACTION_NULL;
continue;
}
skipped = 0;
while(1) {
buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
pkt_offset = skipped - pkt.length;
consumed = rm_get_packet(&buffer, &rmctx, &pkt);
if(consumed < 0 && playback_on != 0) {
if(playback_on == -1) {
/* Error only if packet-parsing failed and playback hadn't started */
DEBUGF("rm_get_packet failed\n");
ci->seek_complete();
return CODEC_ERROR;
}
else {
ci->seek_complete();
return CODEC_OK;
}
}
skipped += pkt.length;
if(pkt.timestamp > (unsigned)param)
break;
ci->advance_buffer(pkt.length);
}
ci->seek_buffer(pkt_offset + rmctx.data_offset + DATA_HEADER_SIZE);
buffer = ci->request_buffer(&n,rmctx.audio_framesize + 1000);
NeAACDecPostSeekReset(decoder, decoder->frame);
ci->set_elapsed(pkt.timestamp);
ci->seek_complete();
}
action = CODEC_ACTION_NULL;
/* Request the required number of bytes from the input buffer */
buffer=ci->request_buffer(&n,rmctx.audio_framesize + 1000);
consumed = rm_get_packet(&buffer, &rmctx, &pkt);
if(consumed < 0 && playback_on != 0) {
if(playback_on == -1) {
/* Error only if packet-parsing failed and playback hadn't started */
DEBUGF("rm_get_packet failed\n");
return CODEC_ERROR;
}
else
break;
}
playback_on = 1;
if (pkt.timestamp >= ci->id3->length)
break;
/* Decode one block - returned samples will be host-endian */
for(i = 0; i < rmctx.sub_packet_cnt; i++) {
ret = NeAACDecDecode(decoder, &frame_info, buffer, rmctx.sub_packet_lengths[i]);
buffer += rmctx.sub_packet_lengths[i];
if (frame_info.error > 0) {
DEBUGF("FAAD: decode error '%s'\n", NeAACDecGetErrorMessage(frame_info.error));
return CODEC_ERROR;
}
ci->pcmbuf_insert(decoder->time_out[0],
decoder->time_out[1],
decoder->frameLength);
ci->set_elapsed(pkt.timestamp);
}
ci->advance_buffer(pkt.length);
}
return CODEC_OK;
}
|
