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Diffstat (limited to 'apps/codecs/a52_rm.c')
-rw-r--r-- | apps/codecs/a52_rm.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/apps/codecs/a52_rm.c b/apps/codecs/a52_rm.c new file mode 100644 index 0000000000..12352ed903 --- /dev/null +++ b/apps/codecs/a52_rm.c | |||
@@ -0,0 +1,190 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id:$ | ||
9 | * | ||
10 | * Copyright (C) 2009 Mohamed Tarek | ||
11 | * | ||
12 | * This program is free software; you can redistribute it and/or | ||
13 | * modify it under the terms of the GNU General Public License | ||
14 | * as published by the Free Software Foundation; either version 2 | ||
15 | * of the License, or (at your option) any later version. | ||
16 | * | ||
17 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY | ||
18 | * KIND, either express or implied. | ||
19 | * | ||
20 | ****************************************************************************/ | ||
21 | |||
22 | #include "codeclib.h" | ||
23 | #include <codecs/librm/rm.h> | ||
24 | #include <inttypes.h> /* Needed by a52.h */ | ||
25 | #include <codecs/liba52/config-a52.h> | ||
26 | #include <codecs/liba52/a52.h> | ||
27 | |||
28 | CODEC_HEADER | ||
29 | |||
30 | #define BUFFER_SIZE 4096 | ||
31 | |||
32 | #define A52_SAMPLESPERFRAME (6*256) | ||
33 | |||
34 | static a52_state_t *state; | ||
35 | unsigned long samplesdone; | ||
36 | unsigned long frequency; | ||
37 | RMContext rmctx; | ||
38 | RMPacket pkt; | ||
39 | |||
40 | static void init_rm(RMContext *rmctx) | ||
41 | { | ||
42 | memcpy(rmctx, (void*)(( (intptr_t)ci->id3->id3v2buf + 3 ) &~ 3), sizeof(RMContext)); | ||
43 | } | ||
44 | |||
45 | /* used outside liba52 */ | ||
46 | static uint8_t buf[3840] IBSS_ATTR; | ||
47 | |||
48 | static inline void output_audio(sample_t *samples) | ||
49 | { | ||
50 | ci->yield(); | ||
51 | ci->pcmbuf_insert(&samples[0], &samples[256], 256); | ||
52 | } | ||
53 | |||
54 | static void a52_decode_data(uint8_t *start, uint8_t *end) | ||
55 | { | ||
56 | static uint8_t *bufptr = buf; | ||
57 | static uint8_t *bufpos = buf + 7; | ||
58 | /* | ||
59 | * sample_rate and flags are static because this routine could | ||
60 | * exit between the a52_syncinfo() and the ao_setup(), and we want | ||
61 | * to have the same values when we get back ! | ||
62 | */ | ||
63 | static int sample_rate; | ||
64 | static int flags; | ||
65 | int bit_rate; | ||
66 | int len; | ||
67 | |||
68 | while (1) { | ||
69 | len = end - start; | ||
70 | if (!len) | ||
71 | break; | ||
72 | if (len > bufpos - bufptr) | ||
73 | len = bufpos - bufptr; | ||
74 | memcpy(bufptr, start, len); | ||
75 | bufptr += len; | ||
76 | start += len; | ||
77 | if (bufptr == bufpos) { | ||
78 | if (bufpos == buf + 7) { | ||
79 | int length; | ||
80 | |||
81 | length = a52_syncinfo(buf, &flags, &sample_rate, &bit_rate); | ||
82 | if (!length) { | ||
83 | //DEBUGF("skip\n"); | ||
84 | for (bufptr = buf; bufptr < buf + 6; bufptr++) | ||
85 | bufptr[0] = bufptr[1]; | ||
86 | continue; | ||
87 | } | ||
88 | bufpos = buf + length; | ||
89 | } else { | ||
90 | /* Unity gain is 1 << 26, and we want to end up on 28 bits | ||
91 | of precision instead of the default 30. | ||
92 | */ | ||
93 | level_t level = 1 << 24; | ||
94 | sample_t bias = 0; | ||
95 | int i; | ||
96 | |||
97 | /* This is the configuration for the downmixing: */ | ||
98 | flags = A52_STEREO | A52_ADJUST_LEVEL; | ||
99 | |||
100 | if (a52_frame(state, buf, &flags, &level, bias)) | ||
101 | goto error; | ||
102 | a52_dynrng(state, NULL, NULL); | ||
103 | frequency = sample_rate; | ||
104 | |||
105 | /* An A52 frame consists of 6 blocks of 256 samples | ||
106 | So we decode and output them one block at a time */ | ||
107 | for (i = 0; i < 6; i++) { | ||
108 | if (a52_block(state)) | ||
109 | goto error; | ||
110 | output_audio(a52_samples(state)); | ||
111 | samplesdone += 256; | ||
112 | } | ||
113 | ci->set_elapsed(samplesdone/(frequency/1000)); | ||
114 | bufptr = buf; | ||
115 | bufpos = buf + 7; | ||
116 | continue; | ||
117 | error: | ||
118 | //logf("Error decoding A52 stream\n"); | ||
119 | bufptr = buf; | ||
120 | bufpos = buf + 7; | ||
121 | } | ||
122 | } | ||
123 | } | ||
124 | } | ||
125 | |||
126 | |||
127 | /* this is the codec entry point */ | ||
128 | enum codec_status codec_main(void) | ||
129 | { | ||
130 | size_t n; | ||
131 | uint8_t *filebuf; | ||
132 | int retval, consumed, packet_offset; | ||
133 | |||
134 | /* Generic codec initialisation */ | ||
135 | ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED); | ||
136 | ci->configure(DSP_SET_SAMPLE_DEPTH, 28); | ||
137 | |||
138 | next_track: | ||
139 | if (codec_init()) { | ||
140 | retval = CODEC_ERROR; | ||
141 | goto exit; | ||
142 | } | ||
143 | |||
144 | while (!ci->taginfo_ready) | ||
145 | ci->yield(); | ||
146 | |||
147 | ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency); | ||
148 | codec_set_replaygain(ci->id3); | ||
149 | |||
150 | /* Intializations */ | ||
151 | state = a52_init(0); | ||
152 | ci->memset(&rmctx,0,sizeof(RMContext)); | ||
153 | ci->memset(&pkt,0,sizeof(RMPacket)); | ||
154 | init_rm(&rmctx); | ||
155 | |||
156 | /* Seek to the first packet */ | ||
157 | ci->advance_buffer(rmctx.data_offset + DATA_HEADER_SIZE ); | ||
158 | |||
159 | /* The main decoding loop */ | ||
160 | while(pkt.timestamp < rmctx.duration) { | ||
161 | ci->yield(); | ||
162 | if (ci->stop_codec || ci->new_track) | ||
163 | break; | ||
164 | |||
165 | if (ci->seek_time) { | ||
166 | packet_offset = ci->seek_time / (((rmctx.block_align + PACKET_HEADER_SIZE)*8*1000)/rmctx.bit_rate); | ||
167 | ci->seek_buffer(rmctx.data_offset + DATA_HEADER_SIZE + packet_offset*(rmctx.block_align + PACKET_HEADER_SIZE)); | ||
168 | samplesdone = A52_SAMPLESPERFRAME * packet_offset; | ||
169 | ci->seek_complete(); | ||
170 | } | ||
171 | |||
172 | filebuf = ci->request_buffer(&n, rmctx.block_align + PACKET_HEADER_SIZE); | ||
173 | consumed = rm_get_packet(&filebuf, &rmctx, &pkt); | ||
174 | if(consumed < 0) { | ||
175 | DEBUGF("rm_get_packet failed\n"); | ||
176 | return CODEC_ERROR; | ||
177 | } | ||
178 | a52_decode_data(filebuf, filebuf + rmctx.block_align); | ||
179 | ci->advance_buffer(pkt.length); | ||
180 | } | ||
181 | |||
182 | retval = CODEC_OK; | ||
183 | |||
184 | if (ci->request_next_track()) | ||
185 | goto next_track; | ||
186 | |||
187 | exit: | ||
188 | a52_free(state); | ||
189 | return retval; | ||
190 | } | ||