summaryrefslogtreecommitdiffstats
path: root/apps/codecs/adx.c
blob: 85e55a4c383b536078857e786126f83d340669c1 (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
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
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
/***************************************************************************
 *             __________               __   ___.
 *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
 *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
 *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
 *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
 *                     \/            \/     \/    \/            \/
 *
 * Copyright (C) 2006 Adam Gashlin (hcs)
 *
 * All files in this archive are subject to the GNU General Public License.
 * See the file COPYING in the source tree root for full license agreement.
 *
 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
 * KIND, either express or implied.
 *
 ****************************************************************************/

#include "codeclib.h"
#include "inttypes.h"

CODEC_HEADER

/* Maximum number of bytes to process in one iteration */
#define WAV_CHUNK_SIZE (1024*2)

/* Volume for ADX decoder */
#define BASE_VOL 0x2000

/* Number of times to loop looped tracks when repeat is disabled */
#define LOOP_TIMES 2

/* Length of fade-out for looped tracks (milliseconds) */
#define FADE_LENGTH 10000L

static int16_t samples[WAV_CHUNK_SIZE] IBSS_ATTR;

/* this is the codec entry point */
enum codec_status codec_main(void)
{
    int channels;
    int sampleswritten, i;
    uint8_t *buf;
    int32_t ch1_1, ch1_2, ch2_1, ch2_2; /* ADPCM history */
    size_t n, bufsize;
    int endofstream; /* end of stream flag */
    uint32_t avgbytespersec;
    int looping; /* looping flag */
    int loop_count; /* number of loops done so far */
    int fade_count; /*  countdown for fadeout */
    int fade_frames; /* length of fade in frames */
    off_t start_adr, end_adr; /* loop points */
    off_t chanstart, bufoff;

    /* Generic codec initialisation */
    /* we only render 16 bits */
    ci->configure(DSP_SET_SAMPLE_DEPTH, (long *)16);
    /*ci->configure(CODEC_SET_FILEBUF_CHUNKSIZE, (int *)(1024*256));*/
  
next_track:
    DEBUGF("ADX: next_track\n");
    if (codec_init()) {
        return CODEC_ERROR;
    }
    DEBUGF("ADX: after init\n");
    
    /* init history */
    ch1_1=ch1_2=ch2_1=ch2_2=0;

    /* wait for track info to load */
    while (!*ci->taginfo_ready && !ci->stop_codec)
        ci->sleep(1);
        
    /* Read the entire file (or as much as possible) */
    DEBUGF("ADX: request initial buffer\n");
    ci->configure(CODEC_SET_FILEBUF_WATERMARK, (int *)(ci->filesize));
    ci->seek_buffer(0);
    buf = ci->request_buffer(&n, ci->filesize);
    if (!buf || n < 0x38) {
        return CODEC_ERROR;
    }
    bufsize = n;
    bufoff = 0;
    DEBUGF("ADX: read size = %x\n",bufsize);

    /* Get file header for starting offset, channel count */
    
    chanstart = ((buf[2] << 8) | buf[3]) + 4;
    channels = buf[7];
    
    /* useful for seeking and reporting current playback position */
    avgbytespersec = ci->id3->frequency * 18 * channels / 32;
    DEBUGF("avgbytespersec=%d\n",avgbytespersec);
    
    /* Get loop data */
    
    looping = 0; start_adr = 0; end_adr = 0;
    if (!memcmp(buf+0x10,"\x01\xF4\x03\x00",4)) {
        /* Soul Calibur 2 style (type 03) */
        DEBUGF("ADX: type 03 found\n");
        /* check if header is too small for loop data */
		if (chanstart-6 < 0x2c) looping=0;
	    else {
		    looping = (buf[0x18]) ||
		              (buf[0x19]) ||
		              (buf[0x1a]) ||
		              (buf[0x1b]);
		    end_adr = (buf[0x28]<<24) |
		              (buf[0x29]<<16) |
		              (buf[0x2a]<<8) |
		              (buf[0x2b]);

		    start_adr = (
		      (buf[0x1c]<<24) |
		      (buf[0x1d]<<16) |
		      (buf[0x1e]<<8) |
		      (buf[0x1f])
		      )/32*channels*18+chanstart;
		}
    } else if (!memcmp(buf+0x10,"\x01\xF4\x04\x00",4)) {
        /* Standard (type 04) */
        DEBUGF("ADX: type 04 found\n");
        /* check if header is too small for loop data */
        if (chanstart-6 < 0x38) looping=0;
		else {
			looping = (buf[0x24]) ||
			          (buf[0x25]) ||
			          (buf[0x26]) ||
			          (buf[0x27]);
		    end_adr = (buf[0x34]<<24) |
		              (buf[0x35]<<16) |
		              (buf[0x36]<<8) |
		              buf[0x37];
			start_adr = (
			  (buf[0x28]<<24) |
			  (buf[0x29]<<16) |
			  (buf[0x2a]<<8) |
			  (buf[0x2b])
			  )/32*channels*18+chanstart;
		}
    } else {
        DEBUGF("ADX: error, couldn't determine ADX type\n");
        return CODEC_ERROR;
    }

    if (looping) {
        DEBUGF("ADX: looped, start: %x end: %x\n",start_adr,end_adr);
    } else {
        DEBUGF("ADX: not looped\n");
    }
    
    /* advance to first frame */
    /*ci->seek_buffer(chanstart);*/
    DEBUGF("ADX: first frame at %x\n",chanstart);
    bufoff = chanstart;

    /* setup pcm buffer format */
    ci->configure(DSP_SWITCH_FREQUENCY, (long *)(ci->id3->frequency));
    if (channels == 2) {
        ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_INTERLEAVED);
    } else if (channels == 1) {
        ci->configure(DSP_SET_STEREO_MODE, (long *)STEREO_MONO);
    } else {
        DEBUGF("ADX CODEC_ERROR: more than 2 channels\n");
        return CODEC_ERROR;
    }    

    endofstream = 0;
    loop_count = 0;
    fade_count = -1; /* disable fade */
    fade_frames = 1;

    /* The main decoder loop */
        
    while (!endofstream) {
        ci->yield();
        if (ci->stop_codec || ci->new_track) {
            break;
        }
        
        /* do we need to loop? */
        if (bufoff >= end_adr-18*channels && looping) {
            DEBUGF("ADX: loop!\n");
            /* check for endless looping */
            if (ci->global_settings->repeat_mode==REPEAT_ONE) {
                loop_count=0;
                fade_count = -1; /* disable fade */
            } else {
                /* otherwise start fade after LOOP_TIMES loops */
                loop_count++;
                if (loop_count >= LOOP_TIMES && fade_count < 0) {
                    /* frames to fade over */
                    fade_frames = FADE_LENGTH*ci->id3->frequency/32/1000;
                    /* volume relative to fade_frames */
                    fade_count = fade_frames;
                    DEBUGF("ADX: fade_frames = %d\n",fade_frames);
                }
            }
            bufoff = start_adr;
        }

        /* do we need to seek? */
        if (ci->seek_time) {
            uint32_t newpos;
            
            DEBUGF("ADX: seek to %dms\n",ci->seek_time);

            endofstream = 0;
            loop_count = 0;
            fade_count = -1; /* disable fade */
            fade_frames = 1;

            newpos = (((uint64_t)avgbytespersec*(ci->seek_time - 1))
                      / (1000LL*18*channels))*(18*channels);
            bufoff = chanstart + newpos;
            while (bufoff > end_adr-18*channels) {
                bufoff-=end_adr-start_adr;
                loop_count++;
            }
            ci->seek_complete();
        }

        if (bufoff>ci->filesize-channels*18) break; /* End of stream */
        
        /* dance with the devil in the pale moonlight */
        if ((bufoff > ci->curpos + (off_t)bufsize - channels*18) ||
            bufoff < ci->curpos) {
            DEBUGF("ADX: requesting another buffer at %x size %x\n",
                bufoff,ci->filesize-bufoff);
            ci->seek_buffer(bufoff);
            buf = ci->request_buffer(&n, ci->filesize-bufoff);
            bufsize = n;
            DEBUGF("ADX: read size = %x\n",bufsize);
            if ((off_t)bufsize < channels*18) {
                /* if we can't get a full frame, just request a single
                   frame (should be able to fit it in the guard buffer) */
                DEBUGF("ADX: requesting single frame at %x\n",bufoff);
                buf = ci->request_buffer(&n, channels*18);
                bufsize=n;
                DEBUGF("ADX: read size = %x\n",bufsize);
            }
            if (!buf) {
                DEBUGF("ADX: couldn't get buffer at %x size %x\n",
                    bufoff,ci->filesize-bufoff);
                return CODEC_ERROR;
            }
            buf-=bufoff;
        }

        if (bufsize == 0) break; /* End of stream */
            
        sampleswritten=0;
          
        while (
        /* Is there data in the file buffer? */
        ((size_t)bufoff <= ci->curpos+bufsize-(18*channels)) &&
        /* Is there space in the output buffer? */
        (sampleswritten <= WAV_CHUNK_SIZE-(32*channels)) &&
        /* Should we be looping? */
        ((!looping) || bufoff < end_adr-18*channels)) {
            /* decode 18 bytes to 32 samples (from bero) */
            int32_t scale = ((buf[bufoff] << 8) | (buf[bufoff+1])) * BASE_VOL;
  
            int32_t ch1_0, d;

            for (i = 2; i < 18; i++)
            {
                d = (buf[bufoff+i] >> 4) & 15;
                if (d & 8) d-= 16;
                ch1_0 = (d*scale + 0x7298L*ch1_1 - 0x3350L*ch1_2) >> 14;
	            if (ch1_0 > 32767) ch1_0 = 32767;
                else if (ch1_0 < -32768) ch1_0 = -32768;
	            samples[sampleswritten] = ch1_0;
	            sampleswritten+=channels;
                ch1_2 = ch1_1; ch1_1 = ch1_0;
                d = buf[bufoff+i] & 15;
                if (d & 8) d -= 16;
                ch1_0 = (d*scale + 0x7298L*ch1_1 - 0x3350L*ch1_2) >> 14;
                if (ch1_0 > 32767) ch1_0 = 32767;
                else if (ch1_0 < -32768) ch1_0 = -32768; 
  	            samples[sampleswritten] = ch1_0;
  	            sampleswritten+=channels;
	            ch1_2 = ch1_1; ch1_1 = ch1_0;
            }
            bufoff+=18;
            
            if (channels == 2) {
                int32_t scale = ((buf[bufoff] << 8)|(buf[bufoff+1]))*BASE_VOL;
  
                int32_t ch2_0, d;
                sampleswritten-=63;

                for (i = 2; i < 18; i++)
                {
                    d = (buf[bufoff+i] >> 4) & 15;
                    if (d & 8) d-= 16;
                    ch2_0 = (d*scale + 0x7298L*ch2_1 - 0x3350L*ch2_2) >> 14;
	                if (ch2_0 > 32767) ch2_0 = 32767;
                    else if (ch2_0 < -32768) ch2_0 = -32768;
	                samples[sampleswritten] = ch2_0;
	                sampleswritten+=2;
                    ch2_2 = ch2_1; ch2_1 = ch2_0;
                    d = buf[bufoff+i] & 15;
                    if (d & 8) d -= 16;
                    ch2_0 = (d*scale + 0x7298L*ch2_1 - 0x3350L*ch2_2) >> 14;
                    if (ch2_0 > 32767) ch2_0 = 32767;
                    else if (ch2_0 < -32768) ch2_0 = -32768; 
  	                samples[sampleswritten] = ch2_0;
  	                sampleswritten+=2;
  	                ch2_2 = ch2_1; ch2_1 = ch2_0;
                }
                bufoff+=18;
                sampleswritten--; /* go back to first channel's next sample */
            }
            if (fade_count>0) {
                fade_count--;
                for (i=0;i<(channels==1?32:64);i++) samples[sampleswritten-i-1]=
                  ((int32_t)samples[sampleswritten-i-1])*fade_count/fade_frames;
                if (fade_count==0) {endofstream=1; break;}
            }
        }

        if (channels == 2)
            sampleswritten >>= 1; /* make samples/channel */

        ci->pcmbuf_insert(samples, NULL, sampleswritten);
            
        ci->set_elapsed(
           ((end_adr-start_adr)*loop_count + bufoff-chanstart)*
           1000LL/avgbytespersec);
    }

    if (ci->request_next_track())
        goto next_track;

    return CODEC_OK;
}