summaryrefslogtreecommitdiffstats
path: root/apps/codecs/wmapro.c
blob: e929c1f428787ba97fc501591f36e547f8f0c756 (plain)
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
/***************************************************************************
 *             __________               __   ___.
 *   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 "libwmapro/wmaprodec.h"

CODEC_HEADER

#define MAXSAMPLES  (1L << 12)  /* Max number of samples in a wma pro subframe */
#define MAXCHANNELS 8
#define BUFSIZE     MAXCHANNELS * MAXSAMPLES
int32_t decoded[BUFSIZE];

/* this is the codec entry point */
enum codec_status codec_main(void)
{
    uint32_t elapsedtime;
    int retval;
    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 */
    uint8_t *data;				/* Pointer to decoder input buffer */
    int size;					/* Size of the input frame to the decoder */

    /* Generic codec initialisation */
    ci->configure(DSP_SET_SAMPLE_DEPTH, 17);
    

next_track:

    /* Wait for the metadata to be read */
    while (!*ci->taginfo_ready && !ci->stop_codec)
        ci->sleep(1);

    retval = CODEC_OK;

    /* Remember the resume position */
    resume_offset = ci->id3->offset;
 restart_track:   
    if (codec_init()) {
        LOGF("(WMA PRO) Error: Error initialising codec\n");
        retval = CODEC_ERROR;
        goto done;
    }

    /* 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));
    
    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);
    
    if (decode_init(&wfx) < 0) {
        LOGF("(WMA PRO) Error: Unsupported or corrupt file\n");
        retval = CODEC_ERROR;
        goto done;
    }

    /* Now advance the file position to the first frame */
    ci->seek_buffer(ci->id3->first_frame_offset);
    
    elapsedtime = 0;
    resume_offset = 0;
    
    /* The main decoding loop */

    while (pktcnt < wfx.numpackets)
    {
        ci->yield();
        if (ci->stop_codec || ci->new_track) {
            goto done;
        }
        
        /* Deal with any pending seek requests */
        if (ci->seek_time){

            if (ci->seek_time == 1) {
                ci->seek_complete();
                goto restart_track; /* Pretend you never saw this... */
            }

            elapsedtime = asf_seek(ci->seek_time, &wfx);
            if (elapsedtime < 1){
                ci->seek_complete();
                goto next_track;
            }

            ci->set_elapsed(elapsedtime);
            ci->seek_complete();
        }

        res = asf_read_packet(&audiobuf, &audiobufsize, &packetlength, &wfx);

        if (res < 0) {
           LOGF("(WMA PRO) Warning: asf_read_packet returned %d", res);
           goto done;
        } else {
            data = audiobuf;
            size = audiobufsize;
            pktcnt++;
            
            /* We now loop on the packet, decoding and outputting the subframes
             * one-by-one. For more information about how wma pro structures its
             * audio frames, see libwmapro/wmaprodec.c */
            while(size > 0)
            {
                outlen = BUFSIZE;   /* decode_packet needs to know the size of the output buffer */
                res = decode_packet(&wfx, decoded, &outlen, data, size);
                if(res < 0) {
                    LOGF("(WMA PRO) Error: decode_packet returned %d", res);
                    goto done;
                }
                data += res;
                size -= res;
                if(outlen) {
                    ci->yield ();
                    /* outlen now holds the size of the data in bytes - we want the
                     * number of samples. */
                    outlen /= (sizeof(int32_t) * wfx.channels);
                    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);
    }
    retval = CODEC_OK;

done:
    if (ci->request_next_track())
        goto next_track;
    
    return retval;
}