2 * ALSA 0.9.x-1.x audio output driver
4 * Copyright (C) 2004 Alex Beregszaszi
6 * modified for real ALSA 0.9.0 support by Zsolt Barat <joy@streamminister.de>
7 * additional AC-3 passthrough support by Andy Lo A Foe <andy@alsaplayer.org>
8 * 08/22/2002 iec958-init rewritten and merged with common init, zsolt
9 * 04/13/2004 merged with ao_alsa1.x, fixes provided by Jindrich Makovicka
10 * 04/25/2004 printfs converted to mp_msg, Zsolt.
12 * This file is part of MPlayer.
14 * MPlayer is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * MPlayer is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License along
25 * with MPlayer; if not, write to the Free Software Foundation, Inc.,
26 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
39 #include "subopt-helper.h"
44 #define ALSA_PCM_NEW_HW_PARAMS_API
45 #define ALSA_PCM_NEW_SW_PARAMS_API
47 #ifdef HAVE_SYS_ASOUNDLIB_H
48 #include <sys/asoundlib.h>
49 #elif defined(HAVE_ALSA_ASOUNDLIB_H)
50 #include <alsa/asoundlib.h>
52 #error "asoundlib.h is not in sys/ or alsa/ - please bugreport"
56 #include "audio_out.h"
57 #include "audio_out_internal.h"
58 #include "libaf/af_format.h"
60 static const ao_info_t info
=
62 "ALSA-0.9.x-1.x audio output",
64 "Alex Beregszaszi, Zsolt Barat <joy@streamminister.de>",
70 static snd_pcm_t
*alsa_handler
;
71 static snd_pcm_format_t alsa_format
;
72 static snd_pcm_hw_params_t
*alsa_hwparams
;
73 static snd_pcm_sw_params_t
*alsa_swparams
;
75 #define BUFFER_TIME 500000 // 0.5 s
78 static size_t bytes_per_sample
;
80 static int alsa_can_pause
;
81 static snd_pcm_sframes_t prepause_frames
;
83 #define ALSA_DEVICE_SIZE 256
85 static void alsa_error_handler(const char *file
, int line
, const char *function
,
86 int err
, const char *format
, ...)
92 vsnprintf(tmp
, sizeof tmp
, format
, va
);
94 tmp
[sizeof tmp
- 1] = '\0';
97 mp_msg(MSGT_AO
, MSGL_ERR
, "[AO_ALSA] alsa-lib: %s:%i:(%s) %s: %s\n",
98 file
, line
, function
, tmp
, snd_strerror(err
));
100 mp_msg(MSGT_AO
, MSGL_ERR
, "[AO_ALSA] alsa-lib: %s:%i:(%s) %s\n",
101 file
, line
, function
, tmp
);
104 /* to set/get/query special features/parameters */
105 static int control(int cmd
, void *arg
)
108 case AOCONTROL_QUERY_FORMAT
:
110 case AOCONTROL_GET_VOLUME
:
111 case AOCONTROL_SET_VOLUME
:
113 ao_control_vol_t
*vol
= (ao_control_vol_t
*)arg
;
117 snd_mixer_elem_t
*elem
;
118 snd_mixer_selem_id_t
*sid
;
120 char *mix_name
= "PCM";
121 char *card
= "default";
125 long get_vol
, set_vol
;
128 if(AF_FORMAT_IS_AC3(ao_data
.format
))
132 char *test_mix_index
;
134 mix_name
= strdup(mixer_channel
);
135 if ((test_mix_index
= strchr(mix_name
, ','))){
138 mix_index
= strtol(test_mix_index
, &test_mix_index
, 0);
140 if (*test_mix_index
){
141 mp_tmsg(MSGT_AO
,MSGL_ERR
,
142 "[AO_ALSA] Invalid mixer index. Defaulting to 0.\n");
147 if(mixer_device
) card
= mixer_device
;
150 snd_mixer_selem_id_alloca(&sid
);
152 //sets simple-mixer index and name
153 snd_mixer_selem_id_set_index(sid
, mix_index
);
154 snd_mixer_selem_id_set_name(sid
, mix_name
);
161 if ((err
= snd_mixer_open(&handle
, 0)) < 0) {
162 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Mixer open error: %s\n", snd_strerror(err
));
163 return CONTROL_ERROR
;
166 if ((err
= snd_mixer_attach(handle
, card
)) < 0) {
167 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Mixer attach %s error: %s\n",
168 card
, snd_strerror(err
));
169 snd_mixer_close(handle
);
170 return CONTROL_ERROR
;
173 if ((err
= snd_mixer_selem_register(handle
, NULL
, NULL
)) < 0) {
174 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Mixer register error: %s\n", snd_strerror(err
));
175 snd_mixer_close(handle
);
176 return CONTROL_ERROR
;
178 err
= snd_mixer_load(handle
);
180 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Mixer load error: %s\n", snd_strerror(err
));
181 snd_mixer_close(handle
);
182 return CONTROL_ERROR
;
185 elem
= snd_mixer_find_selem(handle
, sid
);
187 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to find simple control '%s',%i.\n",
188 snd_mixer_selem_id_get_name(sid
), snd_mixer_selem_id_get_index(sid
));
189 snd_mixer_close(handle
);
190 return CONTROL_ERROR
;
193 snd_mixer_selem_get_playback_volume_range(elem
,&pmin
,&pmax
);
194 f_multi
= (100 / (float)(pmax
- pmin
));
196 if (cmd
== AOCONTROL_SET_VOLUME
) {
198 set_vol
= vol
->left
/ f_multi
+ pmin
+ 0.5;
201 if ((err
= snd_mixer_selem_set_playback_volume(elem
, SND_MIXER_SCHN_FRONT_LEFT
, set_vol
)) < 0) {
202 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Error setting left channel, %s\n",
204 snd_mixer_close(handle
);
205 return CONTROL_ERROR
;
207 mp_msg(MSGT_AO
,MSGL_DBG2
,"left=%li, ", set_vol
);
209 set_vol
= vol
->right
/ f_multi
+ pmin
+ 0.5;
211 if ((err
= snd_mixer_selem_set_playback_volume(elem
, SND_MIXER_SCHN_FRONT_RIGHT
, set_vol
)) < 0) {
212 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Error setting right channel, %s\n",
214 snd_mixer_close(handle
);
215 return CONTROL_ERROR
;
217 mp_msg(MSGT_AO
,MSGL_DBG2
,"right=%li, pmin=%li, pmax=%li, mult=%f\n",
218 set_vol
, pmin
, pmax
, f_multi
);
220 if (snd_mixer_selem_has_playback_switch(elem
)) {
221 int lmute
= (vol
->left
== 0.0);
222 int rmute
= (vol
->right
== 0.0);
223 if (snd_mixer_selem_has_playback_switch_joined(elem
)) {
224 lmute
= rmute
= lmute
&& rmute
;
226 snd_mixer_selem_set_playback_switch(elem
, SND_MIXER_SCHN_FRONT_RIGHT
, !rmute
);
228 snd_mixer_selem_set_playback_switch(elem
, SND_MIXER_SCHN_FRONT_LEFT
, !lmute
);
232 snd_mixer_selem_get_playback_volume(elem
, SND_MIXER_SCHN_FRONT_LEFT
, &get_vol
);
233 vol
->left
= (get_vol
- pmin
) * f_multi
;
234 snd_mixer_selem_get_playback_volume(elem
, SND_MIXER_SCHN_FRONT_RIGHT
, &get_vol
);
235 vol
->right
= (get_vol
- pmin
) * f_multi
;
237 mp_msg(MSGT_AO
,MSGL_DBG2
,"left=%f, right=%f\n",vol
->left
,vol
->right
);
239 snd_mixer_close(handle
);
244 return CONTROL_UNKNOWN
;
247 static void parse_device (char *dest
, const char *src
, int len
)
250 memmove(dest
, src
, len
);
252 while ((tmp
= strrchr(dest
, '.')))
254 while ((tmp
= strrchr(dest
, '=')))
258 static void print_help (void)
260 mp_tmsg (MSGT_AO
, MSGL_FATAL
,
261 "\n[AO_ALSA] -ao alsa commandline help:\n"\
262 "[AO_ALSA] Example: mplayer -ao alsa:device=hw=0.3\n"\
263 "[AO_ALSA] Sets first card fourth hardware device.\n\n"\
264 "[AO_ALSA] Options:\n"\
265 "[AO_ALSA] noblock\n"\
266 "[AO_ALSA] Opens device in non-blocking mode.\n"\
267 "[AO_ALSA] device=<device-name>\n"\
268 "[AO_ALSA] Sets device (change , to . and : to =)\n");
271 static int str_maxlen(void *strp
) {
272 strarg_t
*str
= strp
;
273 return str
->len
<= ALSA_DEVICE_SIZE
;
276 static int try_open_device(const char *device
, int open_mode
, int try_ac3
)
279 char *ac3_device
, *args
;
282 /* to set the non-audio bit, use AES0=6 */
283 len
= strlen(device
);
284 ac3_device
= malloc(len
+ 7 + 1);
287 strcpy(ac3_device
, device
);
288 args
= strchr(ac3_device
, ':');
290 /* no existing parameters: add it behind device name */
291 strcat(ac3_device
, ":AES0=6");
295 while (isspace(*args
));
297 /* ":" but no parameters */
298 strcat(ac3_device
, "AES0=6");
299 } else if (*args
!= '{') {
300 /* a simple list of parameters: add it at the end of the list */
301 strcat(ac3_device
, ",AES0=6");
303 /* parameters in config syntax: add it inside the { } block */
306 while (len
> 0 && isspace(ac3_device
[len
]));
307 if (ac3_device
[len
] == '}')
308 strcpy(ac3_device
+ len
, " AES0=6}");
311 err
= snd_pcm_open(&alsa_handler
, ac3_device
, SND_PCM_STREAM_PLAYBACK
,
315 if (!try_ac3
|| err
< 0)
316 err
= snd_pcm_open(&alsa_handler
, device
, SND_PCM_STREAM_PLAYBACK
,
322 open & setup audio device
323 return: 1=success 0=fail
325 static int init(int rate_hz
, int channels
, int format
, int flags
)
330 snd_pcm_uframes_t chunk_size
;
331 snd_pcm_uframes_t bufsize
;
332 snd_pcm_uframes_t boundary
;
333 const opt_t subopts
[] = {
334 {"block", OPT_ARG_BOOL
, &block
, NULL
},
335 {"device", OPT_ARG_STR
, &device
, str_maxlen
},
339 char alsa_device
[ALSA_DEVICE_SIZE
+ 1];
340 // make sure alsa_device is null-terminated even when using strncpy etc.
341 memset(alsa_device
, 0, ALSA_DEVICE_SIZE
+ 1);
343 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: requested format: %d Hz, %d channels, %x\n", rate_hz
,
346 #if SND_LIB_VERSION >= 0x010005
347 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: using ALSA %s\n", snd_asoundlib_version());
349 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR
);
354 snd_lib_error_set_handler(alsa_error_handler
);
356 ao_data
.samplerate
= rate_hz
;
357 ao_data
.format
= format
;
358 ao_data
.channels
= channels
;
363 alsa_format
= SND_PCM_FORMAT_S8
;
366 alsa_format
= SND_PCM_FORMAT_U8
;
368 case AF_FORMAT_U16_LE
:
369 alsa_format
= SND_PCM_FORMAT_U16_LE
;
371 case AF_FORMAT_U16_BE
:
372 alsa_format
= SND_PCM_FORMAT_U16_BE
;
374 case AF_FORMAT_AC3_LE
:
375 case AF_FORMAT_S16_LE
:
376 alsa_format
= SND_PCM_FORMAT_S16_LE
;
378 case AF_FORMAT_AC3_BE
:
379 case AF_FORMAT_S16_BE
:
380 alsa_format
= SND_PCM_FORMAT_S16_BE
;
382 case AF_FORMAT_U32_LE
:
383 alsa_format
= SND_PCM_FORMAT_U32_LE
;
385 case AF_FORMAT_U32_BE
:
386 alsa_format
= SND_PCM_FORMAT_U32_BE
;
388 case AF_FORMAT_S32_LE
:
389 alsa_format
= SND_PCM_FORMAT_S32_LE
;
391 case AF_FORMAT_S32_BE
:
392 alsa_format
= SND_PCM_FORMAT_S32_BE
;
394 case AF_FORMAT_U24_LE
:
395 alsa_format
= SND_PCM_FORMAT_U24_3LE
;
397 case AF_FORMAT_U24_BE
:
398 alsa_format
= SND_PCM_FORMAT_U24_3BE
;
400 case AF_FORMAT_S24_LE
:
401 alsa_format
= SND_PCM_FORMAT_S24_3LE
;
403 case AF_FORMAT_S24_BE
:
404 alsa_format
= SND_PCM_FORMAT_S24_3BE
;
406 case AF_FORMAT_FLOAT_LE
:
407 alsa_format
= SND_PCM_FORMAT_FLOAT_LE
;
409 case AF_FORMAT_FLOAT_BE
:
410 alsa_format
= SND_PCM_FORMAT_FLOAT_BE
;
412 case AF_FORMAT_MU_LAW
:
413 alsa_format
= SND_PCM_FORMAT_MU_LAW
;
415 case AF_FORMAT_A_LAW
:
416 alsa_format
= SND_PCM_FORMAT_A_LAW
;
420 alsa_format
= SND_PCM_FORMAT_MPEG
; //? default should be -1
428 * sets opening sequence for SPDIF
429 * sets also the playback and other switches 'on the fly'
430 * while opening the abstract alias for the spdif subdevice
433 if (AF_FORMAT_IS_AC3(format
)) {
434 device
.str
= "iec958";
435 mp_msg(MSGT_AO
,MSGL_V
,"alsa-spdif-init: playing AC3, %i channels\n", channels
);
438 /* in any case for multichannel playback we should select
444 device
.str
= "default";
445 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: setup for 1/2 channel(s)\n");
448 if (alsa_format
== SND_PCM_FORMAT_FLOAT_LE
)
449 // hack - use the converter plugin
450 device
.str
= "plug:surround40";
452 device
.str
= "surround40";
453 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: device set to surround40\n");
456 if (alsa_format
== SND_PCM_FORMAT_FLOAT_LE
)
457 device
.str
= "plug:surround51";
459 device
.str
= "surround51";
460 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: device set to surround51\n");
463 if (alsa_format
== SND_PCM_FORMAT_FLOAT_LE
)
464 device
.str
= "plug:surround71";
466 device
.str
= "surround71";
467 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: device set to surround71\n");
470 device
.str
= "default";
471 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] %d channels are not supported.\n",channels
);
473 device
.len
= strlen(device
.str
);
474 if (subopt_parse(ao_subdevice
, subopts
) != 0) {
478 parse_device(alsa_device
, device
.str
, device
.len
);
480 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: using device %s\n", alsa_device
);
483 int open_mode
= block
? 0 : SND_PCM_NONBLOCK
;
484 int isac3
= AF_FORMAT_IS_AC3(format
);
485 //modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC
486 if ((err
= try_open_device(alsa_device
, open_mode
, isac3
)) < 0)
488 if (err
!= -EBUSY
&& !block
) {
489 mp_tmsg(MSGT_AO
,MSGL_INFO
,"[AO_ALSA] Open in nonblock-mode failed, trying to open in block-mode.\n");
490 if ((err
= try_open_device(alsa_device
, 0, isac3
)) < 0) {
491 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Playback open error: %s\n", snd_strerror(err
));
495 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Playback open error: %s\n", snd_strerror(err
));
500 if ((err
= snd_pcm_nonblock(alsa_handler
, 0)) < 0) {
501 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AL_ALSA] Error setting block-mode %s.\n", snd_strerror(err
));
503 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: pcm opened in blocking mode\n");
506 snd_pcm_hw_params_alloca(&alsa_hwparams
);
507 snd_pcm_sw_params_alloca(&alsa_swparams
);
509 // setting hw-parameters
510 if ((err
= snd_pcm_hw_params_any(alsa_handler
, alsa_hwparams
)) < 0)
512 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to get initial parameters: %s\n",
517 err
= snd_pcm_hw_params_set_access(alsa_handler
, alsa_hwparams
,
518 SND_PCM_ACCESS_RW_INTERLEAVED
);
520 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set access type: %s\n",
525 /* workaround for nonsupported formats
526 sets default format to S16_LE if the given formats aren't supported */
527 if ((err
= snd_pcm_hw_params_test_format(alsa_handler
, alsa_hwparams
,
530 mp_tmsg(MSGT_AO
,MSGL_INFO
,
531 "[AO_ALSA] Format %s is not supported by hardware, trying default.\n", af_fmt2str_short(format
));
532 alsa_format
= SND_PCM_FORMAT_S16_LE
;
533 if (AF_FORMAT_IS_AC3(ao_data
.format
))
534 ao_data
.format
= AF_FORMAT_AC3_LE
;
536 ao_data
.format
= AF_FORMAT_S16_LE
;
539 if ((err
= snd_pcm_hw_params_set_format(alsa_handler
, alsa_hwparams
,
542 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set format: %s\n",
547 if ((err
= snd_pcm_hw_params_set_channels_near(alsa_handler
, alsa_hwparams
,
548 &ao_data
.channels
)) < 0)
550 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set channels: %s\n",
555 /* workaround for buggy rate plugin (should be fixed in ALSA 1.0.11)
556 prefer our own resampler */
557 #if SND_LIB_VERSION >= 0x010009
558 if ((err
= snd_pcm_hw_params_set_rate_resample(alsa_handler
, alsa_hwparams
,
561 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to disable resampling: %s\n",
567 if ((err
= snd_pcm_hw_params_set_rate_near(alsa_handler
, alsa_hwparams
,
568 &ao_data
.samplerate
, NULL
)) < 0)
570 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set samplerate-2: %s\n",
575 bytes_per_sample
= af_fmt2bits(ao_data
.format
) / 8;
576 bytes_per_sample
*= ao_data
.channels
;
577 ao_data
.bps
= ao_data
.samplerate
* bytes_per_sample
;
579 if ((err
= snd_pcm_hw_params_set_buffer_time_near(alsa_handler
, alsa_hwparams
,
580 &(unsigned int){BUFFER_TIME
}, NULL
)) < 0)
582 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set buffer time near: %s\n",
587 if ((err
= snd_pcm_hw_params_set_periods_near(alsa_handler
, alsa_hwparams
,
588 &(unsigned int){FRAGCOUNT
}, NULL
)) < 0) {
589 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set periods: %s\n",
594 /* finally install hardware parameters */
595 if ((err
= snd_pcm_hw_params(alsa_handler
, alsa_hwparams
)) < 0)
597 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set hw-parameters: %s\n",
601 // end setting hw-params
604 // gets buffersize for control
605 if ((err
= snd_pcm_hw_params_get_buffer_size(alsa_hwparams
, &bufsize
)) < 0)
607 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to get buffersize: %s\n", snd_strerror(err
));
611 ao_data
.buffersize
= bufsize
* bytes_per_sample
;
612 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: got buffersize=%i\n", ao_data
.buffersize
);
615 if ((err
= snd_pcm_hw_params_get_period_size(alsa_hwparams
, &chunk_size
, NULL
)) < 0) {
616 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO ALSA] Unable to get period size: %s\n", snd_strerror(err
));
619 mp_msg(MSGT_AO
,MSGL_V
,"alsa-init: got period size %li\n", chunk_size
);
621 ao_data
.outburst
= chunk_size
* bytes_per_sample
;
623 /* setting software parameters */
624 if ((err
= snd_pcm_sw_params_current(alsa_handler
, alsa_swparams
)) < 0) {
625 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to get sw-parameters: %s\n",
629 #if SND_LIB_VERSION >= 0x000901
630 if ((err
= snd_pcm_sw_params_get_boundary(alsa_swparams
, &boundary
)) < 0) {
631 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to get boundary: %s\n",
636 boundary
= 0x7fffffff;
638 /* start playing when one period has been written */
639 if ((err
= snd_pcm_sw_params_set_start_threshold(alsa_handler
, alsa_swparams
, chunk_size
)) < 0) {
640 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set start threshold: %s\n",
644 /* disable underrun reporting */
645 if ((err
= snd_pcm_sw_params_set_stop_threshold(alsa_handler
, alsa_swparams
, boundary
)) < 0) {
646 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set stop threshold: %s\n",
650 #if SND_LIB_VERSION >= 0x000901
651 /* play silence when there is an underrun */
652 if ((err
= snd_pcm_sw_params_set_silence_size(alsa_handler
, alsa_swparams
, boundary
)) < 0) {
653 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to set silence size: %s\n",
658 if ((err
= snd_pcm_sw_params(alsa_handler
, alsa_swparams
)) < 0) {
659 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Unable to get sw-parameters: %s\n",
663 /* end setting sw-params */
665 mp_msg(MSGT_AO
,MSGL_V
,"alsa: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
666 ao_data
.samplerate
, ao_data
.channels
, (int)bytes_per_sample
, ao_data
.buffersize
,
667 snd_pcm_format_description(alsa_format
));
669 } // end switch alsa_handler (spdif)
670 alsa_can_pause
= snd_pcm_hw_params_can_pause(alsa_hwparams
);
675 /* close audio device */
676 static void uninit(int immed
)
683 snd_pcm_drain(alsa_handler
);
685 if ((err
= snd_pcm_close(alsa_handler
)) < 0)
687 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm close error: %s\n", snd_strerror(err
));
692 mp_msg(MSGT_AO
,MSGL_V
,"alsa-uninit: pcm closed\n");
696 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] No handler defined!\n");
700 static void audio_pause(void)
704 if (alsa_can_pause
) {
705 if ((err
= snd_pcm_pause(alsa_handler
, 1)) < 0)
707 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm pause error: %s\n", snd_strerror(err
));
710 mp_msg(MSGT_AO
,MSGL_V
,"alsa-pause: pause supported by hardware\n");
712 if (snd_pcm_delay(alsa_handler
, &prepause_frames
) < 0
713 || prepause_frames
< 0)
716 if ((err
= snd_pcm_drop(alsa_handler
)) < 0)
718 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm drop error: %s\n", snd_strerror(err
));
724 static void audio_resume(void)
728 if (snd_pcm_state(alsa_handler
) == SND_PCM_STATE_SUSPENDED
) {
729 mp_tmsg(MSGT_AO
,MSGL_INFO
,"[AO_ALSA] Pcm in suspend mode, trying to resume.\n");
730 while ((err
= snd_pcm_resume(alsa_handler
)) == -EAGAIN
) sleep(1);
732 if (alsa_can_pause
) {
733 if ((err
= snd_pcm_pause(alsa_handler
, 0)) < 0)
735 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm resume error: %s\n", snd_strerror(err
));
738 mp_msg(MSGT_AO
,MSGL_V
,"alsa-resume: resume supported by hardware\n");
740 if ((err
= snd_pcm_prepare(alsa_handler
)) < 0)
742 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err
));
745 if (prepause_frames
) {
746 void *silence
= calloc(prepause_frames
, bytes_per_sample
);
747 play(silence
, prepause_frames
* bytes_per_sample
, 0);
753 /* stop playing and empty buffers (for seeking/pause) */
754 static void reset(void)
759 if ((err
= snd_pcm_drop(alsa_handler
)) < 0)
761 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err
));
764 if ((err
= snd_pcm_prepare(alsa_handler
)) < 0)
766 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(err
));
773 plays 'len' bytes of 'data'
774 returns: number of bytes played
775 modified last at 29.06.02 by jp
776 thanxs for marius <marius@rospot.com> for giving us the light ;)
779 static int play(void* data
, int len
, int flags
)
782 snd_pcm_sframes_t res
= 0;
783 if (!(flags
& AOPLAY_FINAL_CHUNK
))
784 len
= len
/ ao_data
.outburst
* ao_data
.outburst
;
785 num_frames
= len
/ bytes_per_sample
;
787 //mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: frames=%i, len=%i\n",num_frames,len);
790 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Device configuration error.");
798 res
= snd_pcm_writei(alsa_handler
, data
, num_frames
);
804 else if (res
== -ESTRPIPE
) { /* suspend */
805 mp_tmsg(MSGT_AO
,MSGL_INFO
,"[AO_ALSA] Pcm in suspend mode, trying to resume.\n");
806 while ((res
= snd_pcm_resume(alsa_handler
)) == -EAGAIN
)
810 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Write error: %s\n", snd_strerror(res
));
811 mp_tmsg(MSGT_AO
,MSGL_INFO
,"[AO_ALSA] Trying to reset soundcard.\n");
812 if ((res
= snd_pcm_prepare(alsa_handler
)) < 0) {
813 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] pcm prepare error: %s\n", snd_strerror(res
));
820 return res
< 0 ? res
: res
* bytes_per_sample
;
823 /* how many byes are free in the buffer */
824 static int get_space(void)
826 snd_pcm_status_t
*status
;
829 snd_pcm_status_alloca(&status
);
831 if ((ret
= snd_pcm_status(alsa_handler
, status
)) < 0)
833 mp_tmsg(MSGT_AO
,MSGL_ERR
,"[AO_ALSA] Cannot get pcm status: %s\n", snd_strerror(ret
));
837 unsigned space
= snd_pcm_status_get_avail(status
) * bytes_per_sample
;
838 if (space
> ao_data
.buffersize
) // Buffer underrun?
839 space
= ao_data
.buffersize
;
843 /* delay in seconds between first and last sample in buffer */
844 static float get_delay(void)
847 snd_pcm_sframes_t delay
;
849 if (snd_pcm_delay(alsa_handler
, &delay
) < 0)
853 /* underrun - move the application pointer forward to catch up */
854 #if SND_LIB_VERSION >= 0x000901 /* snd_pcm_forward() exists since 0.9.0rc8 */
855 snd_pcm_forward(alsa_handler
, -delay
);
859 return (float)delay
/ (float)ao_data
.samplerate
;