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author | Sean Bartell <wingedtachikoma@gmail.com> | 2011-06-25 21:32:25 -0400 |
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committer | Nils Wallménius <nils@rockbox.org> | 2012-04-25 22:13:20 +0200 |
commit | f40bfc9267b13b54e6379dfe7539447662879d24 (patch) | |
tree | 9b20069d5e62809ff434061ad730096836f916f2 /lib/rbcodec/codecs/alac.c | |
parent | a0009907de7a0107d49040d8a180f140e2eff299 (diff) | |
download | rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.tar.gz rockbox-f40bfc9267b13b54e6379dfe7539447662879d24.zip |
Add codecs to librbcodec.
Change-Id: Id7f4717d51ed02d67cb9f9cb3c0ada4a81843f97
Reviewed-on: http://gerrit.rockbox.org/137
Reviewed-by: Nils Wallménius <nils@rockbox.org>
Tested-by: Nils Wallménius <nils@rockbox.org>
Diffstat (limited to 'lib/rbcodec/codecs/alac.c')
-rw-r--r-- | lib/rbcodec/codecs/alac.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/lib/rbcodec/codecs/alac.c b/lib/rbcodec/codecs/alac.c new file mode 100644 index 0000000000..144d796e5f --- /dev/null +++ b/lib/rbcodec/codecs/alac.c | |||
@@ -0,0 +1,146 @@ | |||
1 | /*************************************************************************** | ||
2 | * __________ __ ___. | ||
3 | * Open \______ \ ____ ____ | | _\_ |__ _______ ___ | ||
4 | * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / | ||
5 | * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < | ||
6 | * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ | ||
7 | * \/ \/ \/ \/ \/ | ||
8 | * $Id$ | ||
9 | * | ||
10 | * Copyright (C) 2005 Dave Chapman | ||
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 "libm4a/m4a.h" | ||
24 | #include "libalac/decomp.h" | ||
25 | |||
26 | CODEC_HEADER | ||
27 | |||
28 | /* The maximum buffer size handled. This amount of bytes is buffered for each | ||
29 | * frame. */ | ||
30 | #define ALAC_BYTE_BUFFER_SIZE 32768 | ||
31 | |||
32 | static int32_t outputbuffer[ALAC_MAX_CHANNELS][ALAC_BLOCKSIZE] IBSS_ATTR; | ||
33 | |||
34 | /* this is the codec entry point */ | ||
35 | enum codec_status codec_main(enum codec_entry_call_reason reason) | ||
36 | { | ||
37 | if (reason == CODEC_LOAD) { | ||
38 | /* Generic codec initialisation */ | ||
39 | ci->configure(DSP_SET_STEREO_MODE, STEREO_NONINTERLEAVED); | ||
40 | ci->configure(DSP_SET_SAMPLE_DEPTH, ALAC_OUTPUT_DEPTH-1); | ||
41 | } | ||
42 | |||
43 | return CODEC_OK; | ||
44 | } | ||
45 | |||
46 | /* this is called for each file to process */ | ||
47 | enum codec_status codec_run(void) | ||
48 | { | ||
49 | size_t n; | ||
50 | demux_res_t demux_res; | ||
51 | stream_t input_stream; | ||
52 | uint32_t samplesdone; | ||
53 | uint32_t elapsedtime = 0; | ||
54 | int samplesdecoded; | ||
55 | unsigned int i; | ||
56 | unsigned char* buffer; | ||
57 | alac_file alac; | ||
58 | intptr_t param; | ||
59 | |||
60 | /* Clean and initialize decoder structures */ | ||
61 | memset(&demux_res , 0, sizeof(demux_res)); | ||
62 | if (codec_init()) { | ||
63 | LOGF("ALAC: Error initialising codec\n"); | ||
64 | return CODEC_ERROR; | ||
65 | } | ||
66 | |||
67 | ci->configure(DSP_SWITCH_FREQUENCY, ci->id3->frequency); | ||
68 | codec_set_replaygain(ci->id3); | ||
69 | |||
70 | ci->seek_buffer(0); | ||
71 | |||
72 | stream_create(&input_stream,ci); | ||
73 | |||
74 | /* Read from ci->id3->offset before calling qtmovie_read. */ | ||
75 | samplesdone = (uint32_t)(((uint64_t)(ci->id3->offset) * ci->id3->frequency) / | ||
76 | (ci->id3->bitrate*128)); | ||
77 | |||
78 | /* if qtmovie_read returns successfully, the stream is up to | ||
79 | * the movie data, which can be used directly by the decoder */ | ||
80 | if (!qtmovie_read(&input_stream, &demux_res)) { | ||
81 | LOGF("ALAC: Error initialising file\n"); | ||
82 | return CODEC_ERROR; | ||
83 | } | ||
84 | |||
85 | /* initialise the sound converter */ | ||
86 | alac_set_info(&alac, demux_res.codecdata); | ||
87 | |||
88 | /* Set i for first frame, seek to desired sample position for resuming. */ | ||
89 | i=0; | ||
90 | if (samplesdone > 0) { | ||
91 | if (m4a_seek(&demux_res, &input_stream, samplesdone, | ||
92 | &samplesdone, (int*) &i)) { | ||
93 | elapsedtime = (samplesdone * 10) / (ci->id3->frequency / 100); | ||
94 | ci->set_elapsed(elapsedtime); | ||
95 | } else { | ||
96 | samplesdone = 0; | ||
97 | } | ||
98 | } | ||
99 | |||
100 | ci->set_elapsed(elapsedtime); | ||
101 | |||
102 | /* The main decoding loop */ | ||
103 | while (i < demux_res.num_sample_byte_sizes) { | ||
104 | enum codec_command_action action = ci->get_command(¶m); | ||
105 | |||
106 | if (action == CODEC_ACTION_HALT) | ||
107 | break; | ||
108 | |||
109 | /* Request the required number of bytes from the input buffer */ | ||
110 | buffer=ci->request_buffer(&n, ALAC_BYTE_BUFFER_SIZE); | ||
111 | |||
112 | /* Deal with any pending seek requests */ | ||
113 | if (action == CODEC_ACTION_SEEK_TIME) { | ||
114 | if (m4a_seek(&demux_res, &input_stream, | ||
115 | (param/10) * (ci->id3->frequency/100), | ||
116 | &samplesdone, (int *)&i)) { | ||
117 | elapsedtime=(samplesdone*10)/(ci->id3->frequency/100); | ||
118 | } | ||
119 | ci->set_elapsed(elapsedtime); | ||
120 | ci->seek_complete(); | ||
121 | } | ||
122 | |||
123 | /* Request the required number of bytes from the input buffer */ | ||
124 | buffer=ci->request_buffer(&n, ALAC_BYTE_BUFFER_SIZE); | ||
125 | |||
126 | /* Decode one block - returned samples will be host-endian */ | ||
127 | samplesdecoded=alac_decode_frame(&alac, buffer, outputbuffer, ci->yield); | ||
128 | ci->yield(); | ||
129 | |||
130 | /* Advance codec buffer by amount of consumed bytes */ | ||
131 | ci->advance_buffer(alac.bytes_consumed); | ||
132 | |||
133 | /* Output the audio */ | ||
134 | ci->pcmbuf_insert(outputbuffer[0], outputbuffer[1], samplesdecoded); | ||
135 | |||
136 | /* Update the elapsed-time indicator */ | ||
137 | samplesdone+=samplesdecoded; | ||
138 | elapsedtime=(samplesdone*10)/(ci->id3->frequency/100); | ||
139 | ci->set_elapsed(elapsedtime); | ||
140 | |||
141 | i++; | ||
142 | } | ||
143 | |||
144 | LOGF("ALAC: Decoded %lu samples\n",(unsigned long)samplesdone); | ||
145 | return CODEC_OK; | ||
146 | } | ||