1 /***************************************************************************
3 * Open \______ \ ____ ____ | | _\_ |__ _______ ___
4 * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
5 * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
6 * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
10 * Copyright (C) 2005 by Nick Lanham
11 * Copyright (C) 2010 by Thomas Martitz
13 * This program is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU General Public License
15 * as published by the Free Software Foundation; either version 2
16 * of the License, or (at your option) any later version.
18 * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
19 * KIND, either express or implied.
21 ****************************************************************************/
35 #include "pcm_sampr.h"
39 extern bool debug_audio
;
42 static int sim_volume
= 0;
44 #if CONFIG_CODEC == SWCODEC
45 static int cvt_status
= -1;
47 static Uint8
* pcm_data
;
48 static size_t pcm_data_size
;
49 static size_t pcm_sample_bytes
;
50 static size_t pcm_channel_bytes
;
62 static SDL_AudioSpec obtained
;
63 static SDL_AudioCVT cvt
;
65 void pcm_play_lock(void)
70 void pcm_play_unlock(void)
75 static void pcm_dma_apply_settings_nolock(void)
77 cvt_status
= SDL_BuildAudioCVT(&cvt
, AUDIO_S16SYS
, 2, pcm_sampr
,
78 obtained
.format
, obtained
.channels
, obtained
.freq
);
81 cvt
.len_ratio
= (double)obtained
.freq
/ (double)pcm_sampr
;
85 void pcm_dma_apply_settings(void)
88 pcm_dma_apply_settings_nolock();
92 void pcm_play_dma_start(const void *addr
, size_t size
)
94 pcm_dma_apply_settings_nolock();
96 pcm_data
= (Uint8
*) addr
;
102 void pcm_play_dma_stop(void)
106 if (udata
.debug
!= NULL
) {
109 DEBUGF("Audio debug file closed\n");
114 void pcm_play_dma_pause(bool pause
)
122 size_t pcm_get_bytes_waiting(void)
124 return pcm_data_size
;
127 extern int sim_volume
; /* in firmware/sound.c */
128 void write_to_soundcard(struct pcm_udata
*udata
)
131 if (debug_audio
&& (udata
->debug
== NULL
)) {
132 udata
->debug
= fopen("audiodebug.raw", "ab");
133 DEBUGF("Audio debug file open\n");
137 Uint32 rd
= udata
->num_in
;
138 Uint32 wr
= (double)rd
* cvt
.len_ratio
;
140 if (wr
> udata
->num_out
) {
142 rd
= (double)wr
/ cvt
.len_ratio
;
144 if (rd
> udata
->num_in
)
147 wr
= (double)rd
* cvt
.len_ratio
;
151 if (wr
== 0 || rd
== 0)
153 udata
->num_out
= udata
->num_in
= 0;
157 if (cvt_status
> 0) {
158 cvt
.len
= rd
* pcm_sample_bytes
;
159 cvt
.buf
= (Uint8
*) malloc(cvt
.len
* cvt
.len_mult
);
161 memcpy(cvt
.buf
, pcm_data
, cvt
.len
);
163 SDL_ConvertAudio(&cvt
);
164 SDL_MixAudio(udata
->stream
, cvt
.buf
, cvt
.len_cvt
, sim_volume
);
166 udata
->num_in
= cvt
.len
/ pcm_sample_bytes
;
167 udata
->num_out
= cvt
.len_cvt
/ pcm_sample_bytes
;
170 if (udata
->debug
!= NULL
) {
171 fwrite(cvt
.buf
, sizeof(Uint8
), cvt
.len_cvt
, udata
->debug
);
177 /* Convert is bad, so do silence */
178 Uint32 num
= wr
*obtained
.channels
;
182 switch (pcm_channel_bytes
)
186 Uint8
*stream
= udata
->stream
;
188 *stream
++ = obtained
.silence
;
193 Uint16
*stream
= (Uint16
*)udata
->stream
;
195 *stream
++ = obtained
.silence
;
200 if (udata
->debug
!= NULL
) {
201 fwrite(udata
->stream
, sizeof(Uint8
), wr
, udata
->debug
);
206 udata
->num_in
= udata
->num_out
= MIN(udata
->num_in
, udata
->num_out
);
207 SDL_MixAudio(udata
->stream
, pcm_data
,
208 udata
->num_out
* pcm_sample_bytes
, sim_volume
);
210 if (udata
->debug
!= NULL
) {
211 fwrite(pcm_data
, sizeof(Uint8
), udata
->num_out
* pcm_sample_bytes
,
218 void sdl_audio_callback(struct pcm_udata
*udata
, Uint8
*stream
, int len
)
220 udata
->stream
= stream
;
222 /* Write what we have in the PCM buffer */
223 if (pcm_data_size
> 0)
226 /* Audio card wants more? Get some more then. */
228 if ((ssize_t
)pcm_data_size
<= 0) {
231 if (pcm_callback_for_more
)
232 pcm_callback_for_more(&pcm_data
, &pcm_data_size
);
235 if (pcm_data_size
> 0) {
237 udata
->num_in
= pcm_data_size
/ pcm_sample_bytes
;
238 udata
->num_out
= len
/ pcm_sample_bytes
;
240 write_to_soundcard(udata
);
242 udata
->num_in
*= pcm_sample_bytes
;
243 udata
->num_out
*= pcm_sample_bytes
;
245 pcm_data
+= udata
->num_in
;
246 pcm_data_size
-= udata
->num_in
;
247 udata
->stream
+= udata
->num_out
;
248 len
-= udata
->num_out
;
250 DEBUGF("sdl_audio_callback: No Data.\n");
252 pcm_play_dma_stopped_callback();
258 const void * pcm_play_dma_get_peak_buffer(int *count
)
260 uintptr_t addr
= (uintptr_t)pcm_data
;
261 *count
= pcm_data_size
/ 4;
262 return (void *)((addr
+ 2) & ~3);
265 #ifdef HAVE_RECORDING
266 void pcm_rec_lock(void)
270 void pcm_rec_unlock(void)
274 void pcm_rec_dma_init(void)
278 void pcm_rec_dma_close(void)
282 void pcm_rec_dma_start(void *start
, size_t size
)
288 void pcm_rec_dma_stop(void)
292 void pcm_rec_dma_record_more(void *start
, size_t size
)
298 unsigned long pcm_rec_status(void)
303 const void * pcm_rec_dma_get_peak_buffer(void)
308 #endif /* HAVE_RECORDING */
310 void pcm_play_dma_init(void)
312 if (SDL_InitSubSystem(SDL_INIT_AUDIO
))
314 DEBUGF("Could not initialize SDL audio subsystem!\n");
318 SDL_AudioSpec wanted_spec
;
322 udata
.debug
= fopen("audiodebug.raw", "wb");
323 DEBUGF("Audio debug file open\n");
326 /* Set 16-bit stereo audio at 44Khz */
327 wanted_spec
.freq
= 44100;
328 wanted_spec
.format
= AUDIO_S16SYS
;
329 wanted_spec
.channels
= 2;
330 wanted_spec
.samples
= 2048;
331 wanted_spec
.callback
=
332 (void (SDLCALL
*)(void *userdata
,
333 Uint8
*stream
, int len
))sdl_audio_callback
;
334 wanted_spec
.userdata
= &udata
;
336 /* Open the audio device and start playing sound! */
337 if(SDL_OpenAudio(&wanted_spec
, &obtained
) < 0) {
338 DEBUGF("Unable to open audio: %s\n", SDL_GetError());
342 switch (obtained
.format
)
346 pcm_channel_bytes
= 1;
352 pcm_channel_bytes
= 2;
355 DEBUGF("Unknown sample format obtained: %u\n",
356 (unsigned)obtained
.format
);
360 pcm_sample_bytes
= obtained
.channels
* pcm_channel_bytes
;
362 pcm_dma_apply_settings_nolock();
365 void pcm_postinit(void)
369 void pcm_set_mixer_volume(int volume
)
374 #endif /* CONFIG_CODEC == SWCODEC */