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
|
/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2010 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 "libasf/asf.h"
#include "libwmavoice/wmavoice.h"
CODEC_HEADER
static AVCodecContext avctx;
static AVPacket avpkt;
#define MAX_FRAMES 3 /*maximum number of frames per superframe*/
#define MAX_FRAMESIZE 160 /* maximum number of samples per frame */
#define BUFSIZE MAX_FRAMES*MAX_FRAMESIZE
static int32_t decoded[BUFSIZE] IBSS_ATTR;
/* This function initialises AVCodecContext with the data needed for the wmapro
* decoder to work. The required data is taken from asf_waveformatex_t because that's
* what the rockbox asf metadata parser fill/work with. In the future, when the
* codec is being optimised for on-target playback this function should not be needed. */
static void init_codec_ctx(AVCodecContext *avctx, asf_waveformatex_t *wfx)
{
/* Copy the extra-data */
avctx->extradata_size = wfx->datalen;
avctx->extradata = (uint8_t *)malloc(wfx->datalen*sizeof(uint8_t));
memcpy(avctx->extradata, wfx->data, wfx->datalen*sizeof(uint8_t));
avctx->block_align = wfx->blockalign;
avctx->sample_rate = wfx->rate;
avctx->channels = wfx->channels;
}
/* 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_SAMPLE_DEPTH, 31);
}
return CODEC_OK;
}
/* this is called for each file to process */
enum codec_status codec_run(void)
{
uint32_t elapsedtime;
asf_waveformatex_t wfx; /* Holds the stream properties */
size_t resume_offset;
int res; /* Return values from asf_read_packet() and decode_packet() */
uint8_t* audiobuf; /* Pointer to the payload of one wma pro packet */
int audiobufsize; /* Payload size */
int packetlength = 0; /* Logical packet size (minus the header size) */
int outlen = 0; /* Number of bytes written to the output buffer */
int pktcnt = 0; /* Count of the packets played */
intptr_t param;
/* Remember the resume position */
resume_offset = ci->id3->offset;
restart_track:
if (codec_init()) {
LOGF("(WMA Voice) Error: Error initialising codec\n");
return CODEC_ERROR;
}
/* Copy the format metadata we've stored in the id3 TOC field. This
saves us from parsing it again here. */
memcpy(&wfx, ci->id3->toc, sizeof(wfx));
memset(&avctx, 0, sizeof(AVCodecContext));
memset(&avpkt, 0, sizeof(AVPacket));
ci->configure(DSP_SWITCH_FREQUENCY, wfx.rate);
ci->configure(DSP_SET_STEREO_MODE, wfx.channels == 1 ?
STEREO_MONO : STEREO_INTERLEAVED);
codec_set_replaygain(ci->id3);
ci->seek_buffer(0);
/* Initialise the AVCodecContext */
init_codec_ctx(&avctx, &wfx);
if (wmavoice_decode_init(&avctx) < 0) {
LOGF("(WMA Voice) Error: Unsupported or corrupt file\n");
return CODEC_ERROR;
}
/* Now advance the file position to the first frame */
ci->seek_buffer(ci->id3->first_frame_offset);
elapsedtime = 0;
ci->set_elapsed(0);
resume_offset = 0;
/* The main decoding loop */
while (pktcnt < wfx.numpackets)
{
enum codec_command_action action = ci->get_command(¶m);
if (action == CODEC_ACTION_HALT)
break;
/* Deal with any pending seek requests */
if (action == CODEC_ACTION_SEEK_TIME) {
ci->set_elapsed(param);
if (param == 0) {
ci->set_elapsed(0);
ci->seek_complete();
goto restart_track; /* Pretend you never saw this... */
}
elapsedtime = asf_seek(param, &wfx);
if (elapsedtime < 1){
ci->set_elapsed(0);
ci->seek_complete();
goto next_track;
}
ci->set_elapsed(elapsedtime);
ci->seek_complete();
}
new_packet:
res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);
if (res < 0) {
LOGF("(WMA Voice) read_packet error %d\n",res);
return CODEC_ERROR;
} else {
avpkt.data = audiobuf;
avpkt.size = audiobufsize;
pktcnt++;
while(avpkt.size > 0)
{
/* wmavoice_decode_packet checks for the output buffer size to
avoid overflows */
outlen = BUFSIZE*sizeof(int32_t);
res = wmavoice_decode_packet(&avctx, decoded, &outlen, &avpkt);
if(res < 0) {
LOGF("(WMA Voice) Error: decode_packet returned %d", res);
if(res == ERROR_WMAPRO_IN_WMAVOICE){
/* Just skip this packet */
ci->advance_buffer(packetlength);
goto new_packet;
}
else {
return CODEC_ERROR;
}
}
avpkt.data += res;
avpkt.size -= res;
if(outlen) {
ci->yield ();
outlen /= sizeof(int32_t);
ci->pcmbuf_insert(decoded, NULL, outlen);
elapsedtime += outlen*10/(wfx.rate/100);
ci->set_elapsed(elapsedtime);
ci->yield ();
}
}
}
/* Advance to the next logical packet */
ci->advance_buffer(packetlength);
}
return CODEC_OK;
}
|
