filename | src/aica/audio.c |
changeset | 779:a60e47313e7b |
prev | 759:f16975739abc |
next | 934:3acd3b3ee6d1 |
author | nkeynes |
date | Wed Oct 29 23:51:58 2008 +0000 (15 years ago) |
permissions | -rw-r--r-- |
last change | Use regparam calling conventions for all functions called from translated code, along with a few other high-use functions. Can probably extend this to all functions, but as it is this is a nice performance boost |
file | annotate | diff | log | raw |
nkeynes@66 | 1 | /** |
nkeynes@561 | 2 | * $Id$ |
nkeynes@66 | 3 | * |
nkeynes@66 | 4 | * Audio mixer core. Combines all the active streams into a single sound |
nkeynes@66 | 5 | * buffer for output. |
nkeynes@66 | 6 | * |
nkeynes@66 | 7 | * Copyright (c) 2005 Nathan Keynes. |
nkeynes@66 | 8 | * |
nkeynes@66 | 9 | * This program is free software; you can redistribute it and/or modify |
nkeynes@66 | 10 | * it under the terms of the GNU General Public License as published by |
nkeynes@66 | 11 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@66 | 12 | * (at your option) any later version. |
nkeynes@66 | 13 | * |
nkeynes@66 | 14 | * This program is distributed in the hope that it will be useful, |
nkeynes@66 | 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@66 | 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@66 | 17 | * GNU General Public License for more details. |
nkeynes@66 | 18 | */ |
nkeynes@66 | 19 | |
nkeynes@66 | 20 | #include "aica/aica.h" |
nkeynes@66 | 21 | #include "aica/audio.h" |
nkeynes@700 | 22 | #include <glib/gmem.h> |
nkeynes@66 | 23 | #include "dream.h" |
nkeynes@66 | 24 | #include <assert.h> |
nkeynes@66 | 25 | #include <string.h> |
nkeynes@66 | 26 | |
nkeynes@697 | 27 | |
nkeynes@697 | 28 | extern struct audio_driver audio_null_driver; |
nkeynes@697 | 29 | extern struct audio_driver audio_osx_driver; |
nkeynes@697 | 30 | extern struct audio_driver audio_pulse_driver; |
nkeynes@697 | 31 | extern struct audio_driver audio_esd_driver; |
nkeynes@697 | 32 | extern struct audio_driver audio_alsa_driver; |
nkeynes@697 | 33 | |
nkeynes@697 | 34 | audio_driver_t audio_driver_list[] = { |
nkeynes@697 | 35 | #ifdef HAVE_CORE_AUDIO |
nkeynes@736 | 36 | &audio_osx_driver, |
nkeynes@697 | 37 | #endif |
nkeynes@657 | 38 | #ifdef HAVE_PULSE |
nkeynes@736 | 39 | &audio_pulse_driver, |
nkeynes@657 | 40 | #endif |
nkeynes@531 | 41 | #ifdef HAVE_ESOUND |
nkeynes@736 | 42 | &audio_esd_driver, |
nkeynes@531 | 43 | #endif |
bhaal22@643 | 44 | #ifdef HAVE_ALSA |
nkeynes@736 | 45 | &audio_alsa_driver, |
bhaal22@643 | 46 | #endif |
nkeynes@736 | 47 | &audio_null_driver, |
nkeynes@736 | 48 | NULL }; |
nkeynes@531 | 49 | |
nkeynes@66 | 50 | #define NUM_BUFFERS 3 |
nkeynes@700 | 51 | #define MS_PER_BUFFER 100 |
nkeynes@66 | 52 | |
nkeynes@66 | 53 | #define BUFFER_EMPTY 0 |
nkeynes@66 | 54 | #define BUFFER_WRITING 1 |
nkeynes@66 | 55 | #define BUFFER_FULL 2 |
nkeynes@66 | 56 | |
nkeynes@66 | 57 | struct audio_state { |
nkeynes@66 | 58 | audio_buffer_t output_buffers[NUM_BUFFERS]; |
nkeynes@66 | 59 | int write_buffer; |
nkeynes@66 | 60 | int read_buffer; |
nkeynes@66 | 61 | uint32_t output_format; |
nkeynes@66 | 62 | uint32_t output_rate; |
nkeynes@66 | 63 | uint32_t output_sample_size; |
nkeynes@465 | 64 | struct audio_channel channels[AUDIO_CHANNEL_COUNT]; |
nkeynes@66 | 65 | } audio; |
nkeynes@66 | 66 | |
nkeynes@66 | 67 | audio_driver_t audio_driver = NULL; |
nkeynes@66 | 68 | |
nkeynes@66 | 69 | #define NEXT_BUFFER() ((audio.write_buffer == NUM_BUFFERS-1) ? 0 : audio.write_buffer+1) |
nkeynes@66 | 70 | |
nkeynes@66 | 71 | extern char *arm_mem; |
nkeynes@66 | 72 | |
nkeynes@66 | 73 | /** |
nkeynes@465 | 74 | * Preserve audio channel state only - don't bother saving the buffers |
nkeynes@465 | 75 | */ |
nkeynes@465 | 76 | void audio_save_state( FILE *f ) |
nkeynes@465 | 77 | { |
nkeynes@465 | 78 | fwrite( &audio.channels[0], sizeof(struct audio_channel), AUDIO_CHANNEL_COUNT, f ); |
nkeynes@465 | 79 | } |
nkeynes@465 | 80 | |
nkeynes@465 | 81 | int audio_load_state( FILE *f ) |
nkeynes@465 | 82 | { |
nkeynes@465 | 83 | int read = fread( &audio.channels[0], sizeof(struct audio_channel), AUDIO_CHANNEL_COUNT, f ); |
nkeynes@465 | 84 | return (read == AUDIO_CHANNEL_COUNT ? 0 : -1 ); |
nkeynes@465 | 85 | } |
nkeynes@465 | 86 | |
nkeynes@531 | 87 | audio_driver_t get_audio_driver_by_name( const char *name ) |
nkeynes@531 | 88 | { |
nkeynes@531 | 89 | int i; |
nkeynes@531 | 90 | if( name == NULL ) { |
nkeynes@697 | 91 | return audio_driver_list[0]; |
nkeynes@531 | 92 | } |
nkeynes@531 | 93 | for( i=0; audio_driver_list[i] != NULL; i++ ) { |
nkeynes@697 | 94 | if( strcasecmp( audio_driver_list[i]->name, name ) == 0 ) { |
nkeynes@697 | 95 | return audio_driver_list[i]; |
nkeynes@697 | 96 | } |
nkeynes@531 | 97 | } |
nkeynes@531 | 98 | |
nkeynes@531 | 99 | return NULL; |
nkeynes@531 | 100 | } |
nkeynes@531 | 101 | |
nkeynes@700 | 102 | void print_audio_drivers( FILE * out ) |
nkeynes@700 | 103 | { |
nkeynes@700 | 104 | int i; |
nkeynes@700 | 105 | fprintf( out, "Available audio drivers:\n" ); |
nkeynes@700 | 106 | for( i=0; audio_driver_list[i] != NULL; i++ ) { |
nkeynes@700 | 107 | fprintf( out, " %-8s %s\n", audio_driver_list[i]->name, |
nkeynes@736 | 108 | gettext(audio_driver_list[i]->description) ); |
nkeynes@700 | 109 | } |
nkeynes@700 | 110 | } |
nkeynes@700 | 111 | |
nkeynes@697 | 112 | audio_driver_t audio_init_driver( const char *preferred_driver ) |
nkeynes@697 | 113 | { |
nkeynes@697 | 114 | audio_driver_t audio_driver = get_audio_driver_by_name(preferred_driver); |
nkeynes@697 | 115 | if( audio_driver == NULL ) { |
nkeynes@697 | 116 | ERROR( "Audio driver '%s' not found, aborting.", preferred_driver ); |
nkeynes@697 | 117 | exit(2); |
nkeynes@697 | 118 | } else if( audio_set_driver( audio_driver ) == FALSE ) { |
nkeynes@779 | 119 | int i; |
nkeynes@779 | 120 | for( i=0; audio_driver_list[i] != NULL; i++ ) { |
nkeynes@779 | 121 | if( audio_driver_list[i] != audio_driver && |
nkeynes@779 | 122 | audio_set_driver( audio_driver_list[i] ) ) { |
nkeynes@779 | 123 | ERROR( "Failed to initialize audio driver %s, falling back to %s", |
nkeynes@779 | 124 | audio_driver->name, audio_driver_list[i]->name ); |
nkeynes@779 | 125 | return audio_driver_list[i]; |
nkeynes@779 | 126 | } |
nkeynes@779 | 127 | } |
nkeynes@779 | 128 | ERROR( "Unable to intialize any audio driver, aborting." ); |
nkeynes@779 | 129 | exit(2); |
nkeynes@759 | 130 | } |
nkeynes@759 | 131 | return audio_driver; |
nkeynes@697 | 132 | } |
nkeynes@697 | 133 | |
nkeynes@465 | 134 | /** |
nkeynes@66 | 135 | * Set the output driver, sample rate and format. Also initializes the |
nkeynes@66 | 136 | * output buffers, flushing any current data and reallocating as |
nkeynes@66 | 137 | * necessary. |
nkeynes@66 | 138 | */ |
nkeynes@697 | 139 | gboolean audio_set_driver( audio_driver_t driver ) |
nkeynes@66 | 140 | { |
nkeynes@66 | 141 | uint32_t bytes_per_sample = 1; |
nkeynes@66 | 142 | uint32_t samples_per_buffer; |
nkeynes@66 | 143 | int i; |
nkeynes@66 | 144 | |
nkeynes@111 | 145 | if( audio_driver == NULL || driver != NULL ) { |
nkeynes@697 | 146 | if( driver == NULL ) |
nkeynes@697 | 147 | driver = &audio_null_driver; |
nkeynes@697 | 148 | if( driver != audio_driver ) { |
nkeynes@697 | 149 | if( !driver->init() ) |
nkeynes@697 | 150 | return FALSE; |
nkeynes@697 | 151 | audio_driver = driver; |
nkeynes@697 | 152 | } |
nkeynes@111 | 153 | } |
nkeynes@111 | 154 | |
nkeynes@697 | 155 | switch( driver->sample_format & AUDIO_FMT_SAMPLE_MASK ) { |
nkeynes@697 | 156 | case AUDIO_FMT_8BIT: |
nkeynes@697 | 157 | bytes_per_sample = 1; |
nkeynes@697 | 158 | break; |
nkeynes@697 | 159 | case AUDIO_FMT_16BIT: |
nkeynes@697 | 160 | bytes_per_sample = 2; |
nkeynes@697 | 161 | break; |
nkeynes@697 | 162 | case AUDIO_FMT_FLOAT: |
nkeynes@697 | 163 | bytes_per_sample = 4; |
nkeynes@697 | 164 | break; |
nkeynes@697 | 165 | } |
nkeynes@697 | 166 | |
nkeynes@697 | 167 | if( driver->sample_format & AUDIO_FMT_STEREO ) |
nkeynes@697 | 168 | bytes_per_sample <<= 1; |
nkeynes@697 | 169 | if( driver->sample_rate == audio.output_rate && |
nkeynes@697 | 170 | bytes_per_sample == audio.output_sample_size ) |
nkeynes@697 | 171 | return TRUE; |
nkeynes@697 | 172 | samples_per_buffer = (driver->sample_rate * MS_PER_BUFFER / 1000); |
nkeynes@66 | 173 | for( i=0; i<NUM_BUFFERS; i++ ) { |
nkeynes@697 | 174 | if( audio.output_buffers[i] != NULL ) |
nkeynes@697 | 175 | free(audio.output_buffers[i]); |
nkeynes@697 | 176 | audio.output_buffers[i] = g_malloc0( sizeof(struct audio_buffer) + samples_per_buffer * bytes_per_sample ); |
nkeynes@697 | 177 | audio.output_buffers[i]->length = samples_per_buffer * bytes_per_sample; |
nkeynes@697 | 178 | audio.output_buffers[i]->posn = 0; |
nkeynes@697 | 179 | audio.output_buffers[i]->status = BUFFER_EMPTY; |
nkeynes@66 | 180 | } |
nkeynes@697 | 181 | audio.output_format = driver->sample_format; |
nkeynes@697 | 182 | audio.output_rate = driver->sample_rate; |
nkeynes@66 | 183 | audio.output_sample_size = bytes_per_sample; |
nkeynes@66 | 184 | audio.write_buffer = 0; |
nkeynes@66 | 185 | audio.read_buffer = 0; |
nkeynes@66 | 186 | |
nkeynes@111 | 187 | return TRUE; |
nkeynes@66 | 188 | } |
nkeynes@66 | 189 | |
nkeynes@66 | 190 | /** |
nkeynes@66 | 191 | * Mark the current write buffer as full and prepare the next buffer for |
nkeynes@66 | 192 | * writing. Returns the next buffer to write to. |
nkeynes@66 | 193 | * If all buffers are full, returns NULL. |
nkeynes@66 | 194 | */ |
nkeynes@66 | 195 | audio_buffer_t audio_next_write_buffer( ) |
nkeynes@66 | 196 | { |
nkeynes@66 | 197 | audio_buffer_t result = NULL; |
nkeynes@66 | 198 | audio_buffer_t current = audio.output_buffers[audio.write_buffer]; |
nkeynes@66 | 199 | current->status = BUFFER_FULL; |
nkeynes@66 | 200 | if( audio.read_buffer == audio.write_buffer && |
nkeynes@697 | 201 | audio_driver->process_buffer( current ) ) { |
nkeynes@697 | 202 | audio_next_read_buffer(); |
nkeynes@66 | 203 | } |
nkeynes@697 | 204 | int next_buffer = NEXT_BUFFER(); |
nkeynes@697 | 205 | result = audio.output_buffers[next_buffer]; |
nkeynes@66 | 206 | if( result->status == BUFFER_FULL ) |
nkeynes@697 | 207 | return NULL; |
nkeynes@66 | 208 | else { |
nkeynes@697 | 209 | audio.write_buffer = next_buffer; |
nkeynes@697 | 210 | result->status = BUFFER_WRITING; |
nkeynes@697 | 211 | return result; |
nkeynes@66 | 212 | } |
nkeynes@66 | 213 | } |
nkeynes@66 | 214 | |
nkeynes@66 | 215 | /** |
nkeynes@66 | 216 | * Mark the current read buffer as empty and return the next buffer for |
nkeynes@66 | 217 | * reading. If there is no next buffer yet, returns NULL. |
nkeynes@66 | 218 | */ |
nkeynes@66 | 219 | audio_buffer_t audio_next_read_buffer( ) |
nkeynes@66 | 220 | { |
nkeynes@66 | 221 | audio_buffer_t current = audio.output_buffers[audio.read_buffer]; |
nkeynes@697 | 222 | if( current->status == BUFFER_FULL ) { |
nkeynes@697 | 223 | // Current read buffer has data, which we've just emptied |
nkeynes@697 | 224 | current->status = BUFFER_EMPTY; |
nkeynes@697 | 225 | current->posn = 0; |
nkeynes@697 | 226 | audio.read_buffer++; |
nkeynes@697 | 227 | if( audio.read_buffer == NUM_BUFFERS ) |
nkeynes@697 | 228 | audio.read_buffer = 0; |
nkeynes@697 | 229 | |
nkeynes@697 | 230 | current = audio.output_buffers[audio.read_buffer]; |
nkeynes@697 | 231 | if( current->status == BUFFER_FULL ) { |
nkeynes@697 | 232 | current->posn = 0; |
nkeynes@697 | 233 | return current; |
nkeynes@697 | 234 | } |
nkeynes@697 | 235 | else return NULL; |
nkeynes@697 | 236 | } else { |
nkeynes@697 | 237 | return NULL; |
nkeynes@697 | 238 | } |
nkeynes@697 | 239 | |
nkeynes@66 | 240 | } |
nkeynes@66 | 241 | |
nkeynes@66 | 242 | /*************************** ADPCM ***********************************/ |
nkeynes@66 | 243 | |
nkeynes@66 | 244 | /** |
nkeynes@66 | 245 | * The following section borrows heavily from ffmpeg, which is |
nkeynes@66 | 246 | * copyright (c) 2001-2003 by the fine folks at the ffmpeg project, |
nkeynes@66 | 247 | * distributed under the GPL version 2 or later. |
nkeynes@66 | 248 | */ |
nkeynes@66 | 249 | |
nkeynes@66 | 250 | #define CLAMP_TO_SHORT(value) \ |
nkeynes@736 | 251 | if (value > 32767) \ |
nkeynes@66 | 252 | value = 32767; \ |
nkeynes@736 | 253 | else if (value < -32768) \ |
nkeynes@66 | 254 | value = -32768; \ |
nkeynes@66 | 255 | |
nkeynes@66 | 256 | static const int yamaha_indexscale[] = { |
nkeynes@736 | 257 | 230, 230, 230, 230, 307, 409, 512, 614, |
nkeynes@736 | 258 | 230, 230, 230, 230, 307, 409, 512, 614 |
nkeynes@66 | 259 | }; |
nkeynes@66 | 260 | |
nkeynes@66 | 261 | static const int yamaha_difflookup[] = { |
nkeynes@736 | 262 | 1, 3, 5, 7, 9, 11, 13, 15, |
nkeynes@736 | 263 | -1, -3, -5, -7, -9, -11, -13, -15 |
nkeynes@66 | 264 | }; |
nkeynes@66 | 265 | |
nkeynes@66 | 266 | static inline short adpcm_yamaha_decode_nibble( audio_channel_t c, |
nkeynes@736 | 267 | unsigned char nibble ) |
nkeynes@66 | 268 | { |
nkeynes@66 | 269 | if( c->adpcm_step == 0 ) { |
nkeynes@66 | 270 | c->adpcm_predict = 0; |
nkeynes@66 | 271 | c->adpcm_step = 127; |
nkeynes@66 | 272 | } |
nkeynes@66 | 273 | |
nkeynes@66 | 274 | c->adpcm_predict += (c->adpcm_step * yamaha_difflookup[nibble]) >> 3; |
nkeynes@66 | 275 | CLAMP_TO_SHORT(c->adpcm_predict); |
nkeynes@66 | 276 | c->adpcm_step = (c->adpcm_step * yamaha_indexscale[nibble]) >> 8; |
nkeynes@66 | 277 | c->adpcm_step = CLAMP(c->adpcm_step, 127, 24567); |
nkeynes@66 | 278 | return c->adpcm_predict; |
nkeynes@66 | 279 | } |
nkeynes@66 | 280 | |
nkeynes@66 | 281 | /*************************** Sample mixer *****************************/ |
nkeynes@66 | 282 | |
nkeynes@66 | 283 | /** |
nkeynes@66 | 284 | * Mix a single output sample. |
nkeynes@66 | 285 | */ |
nkeynes@73 | 286 | void audio_mix_samples( int num_samples ) |
nkeynes@66 | 287 | { |
nkeynes@66 | 288 | int i, j; |
nkeynes@73 | 289 | int32_t result_buf[num_samples][2]; |
nkeynes@73 | 290 | |
nkeynes@73 | 291 | memset( &result_buf, 0, sizeof(result_buf) ); |
nkeynes@66 | 292 | |
nkeynes@465 | 293 | for( i=0; i < AUDIO_CHANNEL_COUNT; i++ ) { |
nkeynes@697 | 294 | audio_channel_t channel = &audio.channels[i]; |
nkeynes@697 | 295 | if( channel->active ) { |
nkeynes@697 | 296 | int32_t sample; |
nkeynes@697 | 297 | int vol_left = (channel->vol * (32 - channel->pan)) >> 5; |
nkeynes@697 | 298 | int vol_right = (channel->vol * (channel->pan + 1)) >> 5; |
nkeynes@697 | 299 | switch( channel->sample_format ) { |
nkeynes@697 | 300 | case AUDIO_FMT_16BIT: |
nkeynes@697 | 301 | for( j=0; j<num_samples; j++ ) { |
nkeynes@697 | 302 | sample = ((int16_t *)(arm_mem + channel->start))[channel->posn]; |
nkeynes@697 | 303 | result_buf[j][0] += sample * vol_left; |
nkeynes@697 | 304 | result_buf[j][1] += sample * vol_right; |
nkeynes@697 | 305 | |
nkeynes@697 | 306 | channel->posn_left += channel->sample_rate; |
nkeynes@697 | 307 | while( channel->posn_left > audio.output_rate ) { |
nkeynes@697 | 308 | channel->posn_left -= audio.output_rate; |
nkeynes@697 | 309 | channel->posn++; |
nkeynes@697 | 310 | |
nkeynes@697 | 311 | if( channel->posn == channel->end ) { |
nkeynes@697 | 312 | if( channel->loop ) { |
nkeynes@697 | 313 | channel->posn = channel->loop_start; |
nkeynes@697 | 314 | channel->loop = LOOP_LOOPED; |
nkeynes@697 | 315 | } else { |
nkeynes@697 | 316 | audio_stop_channel(i); |
nkeynes@697 | 317 | j = num_samples; |
nkeynes@697 | 318 | break; |
nkeynes@697 | 319 | } |
nkeynes@697 | 320 | } |
nkeynes@697 | 321 | } |
nkeynes@697 | 322 | } |
nkeynes@697 | 323 | break; |
nkeynes@697 | 324 | case AUDIO_FMT_8BIT: |
nkeynes@697 | 325 | for( j=0; j<num_samples; j++ ) { |
nkeynes@697 | 326 | sample = ((int8_t *)(arm_mem + channel->start))[channel->posn] << 8; |
nkeynes@697 | 327 | result_buf[j][0] += sample * vol_left; |
nkeynes@697 | 328 | result_buf[j][1] += sample * vol_right; |
nkeynes@697 | 329 | |
nkeynes@697 | 330 | channel->posn_left += channel->sample_rate; |
nkeynes@697 | 331 | while( channel->posn_left > audio.output_rate ) { |
nkeynes@697 | 332 | channel->posn_left -= audio.output_rate; |
nkeynes@697 | 333 | channel->posn++; |
nkeynes@697 | 334 | |
nkeynes@697 | 335 | if( channel->posn == channel->end ) { |
nkeynes@697 | 336 | if( channel->loop ) { |
nkeynes@697 | 337 | channel->posn = channel->loop_start; |
nkeynes@697 | 338 | channel->loop = LOOP_LOOPED; |
nkeynes@697 | 339 | } else { |
nkeynes@697 | 340 | audio_stop_channel(i); |
nkeynes@697 | 341 | j = num_samples; |
nkeynes@697 | 342 | break; |
nkeynes@697 | 343 | } |
nkeynes@697 | 344 | } |
nkeynes@697 | 345 | } |
nkeynes@697 | 346 | } |
nkeynes@697 | 347 | break; |
nkeynes@697 | 348 | case AUDIO_FMT_ADPCM: |
nkeynes@697 | 349 | for( j=0; j<num_samples; j++ ) { |
nkeynes@697 | 350 | sample = (int16_t)channel->adpcm_predict; |
nkeynes@697 | 351 | result_buf[j][0] += sample * vol_left; |
nkeynes@697 | 352 | result_buf[j][1] += sample * vol_right; |
nkeynes@697 | 353 | channel->posn_left += channel->sample_rate; |
nkeynes@697 | 354 | while( channel->posn_left > audio.output_rate ) { |
nkeynes@697 | 355 | channel->posn_left -= audio.output_rate; |
nkeynes@697 | 356 | channel->posn++; |
nkeynes@697 | 357 | if( channel->posn == channel->end ) { |
nkeynes@697 | 358 | if( channel->loop ) { |
nkeynes@697 | 359 | channel->posn = channel->loop_start; |
nkeynes@697 | 360 | channel->loop = LOOP_LOOPED; |
nkeynes@697 | 361 | channel->adpcm_predict = 0; |
nkeynes@697 | 362 | channel->adpcm_step = 0; |
nkeynes@697 | 363 | } else { |
nkeynes@697 | 364 | audio_stop_channel(i); |
nkeynes@697 | 365 | j = num_samples; |
nkeynes@697 | 366 | break; |
nkeynes@697 | 367 | } |
nkeynes@697 | 368 | } |
nkeynes@697 | 369 | uint8_t data = ((uint8_t *)(arm_mem + channel->start))[channel->posn>>1]; |
nkeynes@697 | 370 | if( channel->posn&1 ) { |
nkeynes@697 | 371 | adpcm_yamaha_decode_nibble( channel, (data >> 4) & 0x0F ); |
nkeynes@697 | 372 | } else { |
nkeynes@697 | 373 | adpcm_yamaha_decode_nibble( channel, data & 0x0F ); |
nkeynes@697 | 374 | } |
nkeynes@697 | 375 | } |
nkeynes@697 | 376 | } |
nkeynes@697 | 377 | break; |
nkeynes@697 | 378 | default: |
nkeynes@697 | 379 | break; |
nkeynes@697 | 380 | } |
nkeynes@697 | 381 | } |
nkeynes@66 | 382 | } |
nkeynes@736 | 383 | |
nkeynes@66 | 384 | /* Down-render to the final output format */ |
nkeynes@697 | 385 | audio_buffer_t buf = audio.output_buffers[audio.write_buffer]; |
nkeynes@697 | 386 | if( buf->status == BUFFER_FULL ) { |
nkeynes@697 | 387 | buf = audio_next_write_buffer(); |
nkeynes@697 | 388 | if( buf == NULL ) { // no available space |
nkeynes@697 | 389 | return; |
nkeynes@697 | 390 | } |
nkeynes@697 | 391 | } |
nkeynes@736 | 392 | |
nkeynes@697 | 393 | switch( audio.output_format & AUDIO_FMT_SAMPLE_MASK ) { |
nkeynes@697 | 394 | case AUDIO_FMT_FLOAT: { |
nkeynes@697 | 395 | float scale = 1.0/SHRT_MAX; |
nkeynes@697 | 396 | float *data = (float *)&buf->data[buf->posn]; |
nkeynes@697 | 397 | for( j=0; j<num_samples; j++ ) { |
nkeynes@697 | 398 | *data++ = scale * (result_buf[j][0] >> 6); |
nkeynes@697 | 399 | *data++ = scale * (result_buf[j][1] >> 6); |
nkeynes@697 | 400 | buf->posn += 8; |
nkeynes@697 | 401 | if( buf->posn == buf->length ) { |
nkeynes@697 | 402 | buf = audio_next_write_buffer(); |
nkeynes@697 | 403 | if( buf == NULL ) { |
nkeynes@697 | 404 | break; |
nkeynes@697 | 405 | } |
nkeynes@697 | 406 | data = (float *)&buf->data[0]; |
nkeynes@697 | 407 | } |
nkeynes@697 | 408 | } |
nkeynes@697 | 409 | break; |
nkeynes@697 | 410 | } |
nkeynes@697 | 411 | case AUDIO_FMT_16BIT: { |
nkeynes@697 | 412 | int16_t *data = (int16_t *)&buf->data[buf->posn]; |
nkeynes@697 | 413 | for( j=0; j < num_samples; j++ ) { |
nkeynes@697 | 414 | *data++ = (int16_t)(result_buf[j][0] >> 6); |
nkeynes@697 | 415 | *data++ = (int16_t)(result_buf[j][1] >> 6); |
nkeynes@697 | 416 | buf->posn += 4; |
nkeynes@697 | 417 | if( buf->posn == buf->length ) { |
nkeynes@697 | 418 | buf = audio_next_write_buffer(); |
nkeynes@697 | 419 | if( buf == NULL ) { |
nkeynes@697 | 420 | // All buffers are full |
nkeynes@697 | 421 | break; |
nkeynes@697 | 422 | } |
nkeynes@697 | 423 | data = (int16_t *)&buf->data[0]; |
nkeynes@697 | 424 | } |
nkeynes@697 | 425 | } |
nkeynes@697 | 426 | break; |
nkeynes@697 | 427 | } |
nkeynes@697 | 428 | case AUDIO_FMT_8BIT: { |
nkeynes@700 | 429 | int8_t *data = (int8_t *)&buf->data[buf->posn]; |
nkeynes@697 | 430 | for( j=0; j < num_samples; j++ ) { |
nkeynes@697 | 431 | *data++ = (int8_t)(result_buf[j][0] >> 16); |
nkeynes@697 | 432 | *data++ = (int8_t)(result_buf[j][1] >> 16); |
nkeynes@697 | 433 | buf->posn += 2; |
nkeynes@697 | 434 | if( buf->posn == buf->length ) { |
nkeynes@697 | 435 | buf = audio_next_write_buffer(); |
nkeynes@697 | 436 | if( buf == NULL ) { |
nkeynes@697 | 437 | // All buffers are full |
nkeynes@697 | 438 | break; |
nkeynes@697 | 439 | } |
nkeynes@697 | 440 | buf = audio.output_buffers[audio.write_buffer]; |
nkeynes@700 | 441 | data = (int8_t *)&buf->data[0]; |
nkeynes@697 | 442 | } |
nkeynes@697 | 443 | } |
nkeynes@697 | 444 | break; |
nkeynes@697 | 445 | } |
nkeynes@66 | 446 | } |
nkeynes@66 | 447 | } |
nkeynes@66 | 448 | |
nkeynes@66 | 449 | /********************** Internal AICA calls ***************************/ |
nkeynes@66 | 450 | |
nkeynes@66 | 451 | audio_channel_t audio_get_channel( int channel ) |
nkeynes@66 | 452 | { |
nkeynes@66 | 453 | return &audio.channels[channel]; |
nkeynes@66 | 454 | } |
nkeynes@66 | 455 | |
nkeynes@434 | 456 | void audio_start_stop_channel( int channel, gboolean start ) |
nkeynes@434 | 457 | { |
nkeynes@434 | 458 | if( audio.channels[channel].active ) { |
nkeynes@736 | 459 | if( !start ) { |
nkeynes@736 | 460 | audio_stop_channel(channel); |
nkeynes@736 | 461 | } |
nkeynes@434 | 462 | } else if( start ) { |
nkeynes@736 | 463 | audio_start_channel(channel); |
nkeynes@434 | 464 | } |
nkeynes@434 | 465 | } |
nkeynes@434 | 466 | |
nkeynes@66 | 467 | void audio_stop_channel( int channel ) |
nkeynes@66 | 468 | { |
nkeynes@66 | 469 | audio.channels[channel].active = FALSE; |
nkeynes@66 | 470 | } |
nkeynes@66 | 471 | |
nkeynes@66 | 472 | |
nkeynes@66 | 473 | void audio_start_channel( int channel ) |
nkeynes@66 | 474 | { |
nkeynes@66 | 475 | audio.channels[channel].posn = 0; |
nkeynes@66 | 476 | audio.channels[channel].posn_left = 0; |
nkeynes@66 | 477 | audio.channels[channel].active = TRUE; |
nkeynes@434 | 478 | if( audio.channels[channel].sample_format == AUDIO_FMT_ADPCM ) { |
nkeynes@736 | 479 | audio.channels[channel].adpcm_step = 0; |
nkeynes@736 | 480 | audio.channels[channel].adpcm_predict = 0; |
nkeynes@736 | 481 | uint8_t data = ((uint8_t *)(arm_mem + audio.channels[channel].start))[0]; |
nkeynes@736 | 482 | adpcm_yamaha_decode_nibble( &audio.channels[channel], data & 0x0F ); |
nkeynes@434 | 483 | } |
nkeynes@66 | 484 | } |
.