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mpv/libao2/ao_alsa9.c

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/*
ao_alsa9 - ALSA-0.9.x output plugin for MPlayer
(C) Alex Beregszaszi <alex@naxine.org>
modified for better alsa-0.9.0beta12(rc1)-support by Joy Winter <joy@pingfm.org>
additional AC3 passthrough support by Andy Lo A Foe <andy@alsaplayer.org>
Any bugreports regarding to this driver are welcome either to the mplayer-user-mailinglist or directly to the authors.
*/
#include <errno.h>
#include <sys/time.h>
#include <stdlib.h>
//#include <unistd.h>
//#include <string.h>
#include "../config.h"
#if HAVE_SYS_ASOUNDLIB_H
#include <sys/asoundlib.h>
#elif HAVE_ALSA_ASOUNDLIB_H
#include <alsa/asoundlib.h>
#else
#error "asoundlib.h is not in sys/ or alsa/ - please bugreport"
#endif
#include "audio_out.h"
#include "audio_out_internal.h"
#include "afmt.h"
extern int verbose;
static ao_info_t info =
{
"ALSA-0.9.x audio output",
"alsa9",
"Alex Beregszaszi <alex@naxine.org>, Joy Winter <joy@pingfm.org>",
"under developement"
};
LIBAO_EXTERN(alsa9)
static snd_pcm_t *alsa_handler;
static snd_pcm_format_t alsa_format;
static snd_pcm_hw_params_t *alsa_hwparams;
static snd_pcm_sw_params_t *alsa_swparams;
static char *alsa_device;
static int alsa_fragsize = OUTBURST; /* possible 4096, original 8192, OUTBURST is set statically to 512 in config.h but now its not used cause chunksize is allocated dynamically. */
static int alsa_fragcount = 8;
static int chunk_size = -1;
static int buffer_size = 0;
static int start_delay = 0;
static int stop_delay = 0;
static size_t bits_per_sample, bits_per_frame;
static size_t chunk_bytes;
#define ALSA_DEVICE_SIZE 48
#define BUFFERTIME /* last undef */
#undef SET_PERIOD /* only function now is to set chunksize staticaly, last defined */
#define SW_PARAMS /* last undef */
snd_pcm_t *
spdif_init(int acard, int adevice)
{
//char *pcm_name = "hw:0,2"; /* first card second device */
char pcm_name[255];
static snd_aes_iec958_t spdif;
snd_pcm_info_t *info;
snd_pcm_t *handler;
snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
unsigned int channels = 2;
unsigned int rate = 48000;
int err, c;
if (err = snprintf(&pcm_name[0], 11, "hw:%1d,%1d", acard, adevice) <= 0)
{
return NULL;
}
if ((err = snd_pcm_open(&handler, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
{
fprintf(stderr, "open: %s\n", snd_strerror(err));
return NULL;
}
snd_pcm_info_alloca(&info);
if ((err = snd_pcm_info(handler, info)) < 0) {
fprintf(stderr, "info: %s\n", snd_strerror(err));
snd_pcm_close(handler);
return NULL;
}
printf("device: %d, subdevice: %d\n", snd_pcm_info_get_device(info),
snd_pcm_info_get_subdevice(info));
{
snd_ctl_elem_value_t *ctl;
snd_ctl_t *ctl_handler;
char ctl_name[12];
int ctl_card;
spdif.status[0] = IEC958_AES0_NONAUDIO |
IEC958_AES0_CON_EMPHASIS_NONE;
spdif.status[1] = IEC958_AES1_CON_ORIGINAL |
IEC958_AES1_CON_PCM_CODER;
spdif.status[2] = 0;
spdif.status[3] = IEC958_AES3_CON_FS_48000;
snd_ctl_elem_value_alloca(&ctl);
snd_ctl_elem_value_set_interface(ctl, SND_CTL_ELEM_IFACE_PCM);
snd_ctl_elem_value_set_device(ctl, snd_pcm_info_get_device(info));
snd_ctl_elem_value_set_subdevice(ctl, snd_pcm_info_get_subdevice(info));
snd_ctl_elem_value_set_name(ctl, SND_CTL_NAME_IEC958("", PLAYBACK,PCM_STREAM));
snd_ctl_elem_value_set_iec958(ctl, &spdif);
ctl_card = snd_pcm_info_get_card(info);
if (ctl_card < 0) {
fprintf(stderr, "Unable to setup the IEC958 (S/PDIF) interface - PCM has no assigned card");
goto __diga_end;
}
sprintf(ctl_name, "hw:%d", ctl_card);
printf("hw:%d\n", ctl_card);
if ((err = snd_ctl_open(&ctl_handler, ctl_name, 0)) < 0) {
fprintf(stderr, "Unable to open the control interface '%s': %s", ctl_name, snd_strerror(err));
goto __diga_end;
}
if ((err = snd_ctl_elem_write(ctl_handler, ctl)) < 0) {
fprintf(stderr, "Unable to update the IEC958 control: %s", snd_strerror(err));
goto __diga_end;
}
snd_ctl_close(ctl_handler);
__diga_end:
}
{
snd_pcm_hw_params_t *params;
snd_pcm_sw_params_t *swparams;
snd_pcm_hw_params_alloca(&params);
snd_pcm_sw_params_alloca(&swparams);
err = snd_pcm_hw_params_any(handler, params);
if (err < 0) {
fprintf(stderr, "Broken configuration for this PCM: no configurations available");
return NULL;
}
err = snd_pcm_hw_params_set_access(handler, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0) {
fprintf(stderr, "Access tyep not available");
return NULL;
}
err = snd_pcm_hw_params_set_format(handler, params, format);
if (err < 0) {
fprintf(stderr, "Sample format non available");
return NULL;
}
err = snd_pcm_hw_params_set_channels(handler, params, channels);
if (err < 0) {
fprintf(stderr, "Channels count non avaible");
return NULL;
}
err = snd_pcm_hw_params_set_rate_near(handler, params, rate, 0); assert(err >= 0);
err = snd_pcm_hw_params(handler, params);
if (err < 0) {
fprintf(stderr, "Cannot set buffer size\n");
return NULL;
}
snd_pcm_sw_params_current(handler, swparams);
}
return handler;
}
/* to set/get/query special features/parameters */
static int control(int cmd, int arg)
{
return(CONTROL_UNKNOWN);
}
/*
open & setup audio device
return: 1=success 0=fail
*/
static int init(int rate_hz, int channels, int format, int flags)
{
int err;
int cards = -1;
snd_pcm_info_t *alsa_info;
size_t xfer_align; //new
snd_pcm_uframes_t start_threshold, stop_threshold; //new
printf("alsa-init: testing and bugreports are welcome.\n");
printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
channels, audio_out_format_name(format));
alsa_handler = NULL;
if (verbose)
printf("alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR);
if ((err = snd_card_next(&cards)) < 0 || cards < 0)
{
printf("alsa-init: no soundcards found: %s\n", snd_strerror(err));
return(0);
}
ao_data.samplerate = rate_hz;
ao_data.bps = channels; /* really this is bytes per frame so bad varname */
ao_data.format = format;
ao_data.channels = channels;
ao_data.outburst = OUTBURST;
ao_data.buffersize = 16384;
switch (format)
{
case AFMT_S8:
alsa_format = SND_PCM_FORMAT_S8;
break;
case AFMT_U8:
alsa_format = SND_PCM_FORMAT_U8;
break;
case AFMT_U16_LE:
alsa_format = SND_PCM_FORMAT_U16_LE;
break;
case AFMT_U16_BE:
alsa_format = SND_PCM_FORMAT_U16_BE;
break;
#ifndef WORDS_BIGENDIAN
case AFMT_AC3:
#endif
case AFMT_S16_LE:
alsa_format = SND_PCM_FORMAT_S16_LE;
break;
#ifdef WORDS_BIGENDIAN
case AFMT_AC3:
#endif
case AFMT_S16_BE:
alsa_format = SND_PCM_FORMAT_S16_BE;
break;
default:
alsa_format = SND_PCM_FORMAT_MPEG;
break;
}
switch(alsa_format)
{
case SND_PCM_FORMAT_S16_LE:
case SND_PCM_FORMAT_U16_LE:
ao_data.bps *= 2;
break;
case -1:
printf("alsa-init: invalid format (%s) requested - output disabled\n",
audio_out_format_name(format));
return(0);
default:
break;
}
if (ao_subdevice != NULL) // ?? makes no sense
alsa_device = ao_subdevice;
if (alsa_device == NULL)
{
int tmp_device, tmp_subdevice, err;
if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
{
printf("alsa-init: memory allocation error: %s\n", snd_strerror(err));
return(0);
}
if ((alsa_device = alloca(ALSA_DEVICE_SIZE)) == NULL)
{
printf("alsa-init: memory allocation error: %s\n", strerror(errno));
return(0);
}
if ((tmp_device = snd_pcm_info_get_device(alsa_info)) < 0)
{
printf("alsa-init: cant get device\n");
return(0);
}
if ((tmp_subdevice = snd_pcm_info_get_subdevice(alsa_info)) < 0)
{
printf("alsa-init: cant get subdevice\n");
return(0);
}
if (verbose)
printf("alsa-init: got device=%i, subdevice=%i\n", tmp_device, tmp_subdevice);
if ((err = snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%1d,%1d", tmp_device, tmp_subdevice)) <= 0)
{
printf("alsa-init: cant wrote device-id\n");
}
snd_pcm_info_free(alsa_info);
}
printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1,
(cards >= 0) ? "" : "s", alsa_device);
if (format == AFMT_AC3) {
// Try to initialize the SPDIF interface
alsa_handler = spdif_init(0, 2);
}
if (!alsa_handler) {
if ((err = snd_pcm_open(&alsa_handler,alsa_device,SND_PCM_STREAM_PLAYBACK,0)) < 0)
{
printf("alsa-init: playback open error: %s\n", snd_strerror(err));
return(0);
}
}
snd_pcm_hw_params_alloca(&alsa_hwparams);
snd_pcm_sw_params_alloca(&alsa_swparams);
// setting hw-parameters
if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get initial parameters: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
{
printf("alsa-init: unable to set access type: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
alsa_format)) < 0)
{
printf("alsa-init: unable to set format: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams,
ao_data.channels)) < 0)
{
printf("alsa-init: unable to set channels: %s\n",
snd_strerror(err));
return(0);
}
if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams, ao_data.samplerate, 0)) < 0)
{
printf("alsa-init: unable to set samplerate-2: %s\n",
snd_strerror(err));
//snd_pcm_hw_params_dump(alsa_hwparams, errlog); jp
return(0);
}
#ifdef SET_PERIOD
{
if ((err = snd_pcm_hw_params_set_period_size(alsa_handler, alsa_hwparams, alsa_fragsize, 0)) < 0)
{
printf("alsa-init: unable to set periodsize: %s\n", snd_strerror(err));
return(0);
}
}
#endif
#ifdef BUFFERTIME
{
int alsa_buffer_time = 500000; /* original 60 */
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time, 0)) < 0)
{
printf("alsa-init: unable to set buffer time near: %s\n",
snd_strerror(err));
return(0);
} else
alsa_buffer_time = err;
if ((err = snd_pcm_hw_params_set_period_time_near(alsa_handler, alsa_hwparams, alsa_buffer_time/4, 0)) < 0)
/* original: alsa_buffer_time/ao_data.bps */
{
printf("alsa-init: unable to set period time: %s\n",
snd_strerror(err));
return(0);
}
if (verbose)
printf("alsa-init: buffer_time: %d, period_time :%d\n",alsa_buffer_time, err);
}
#endif
/* get chunk-size */
if ((err = snd_pcm_hw_params_get_period_size(alsa_hwparams, 0)) < 0)
{
printf("alsa-init: unable to get chunk-size in hw-params: %s\n", snd_strerror(err));
return(0);
} else
{
chunk_size = err;
if (verbose) {printf("alsa-init: got chunksize %i\n", chunk_size);}
}
/* get buffer size */
if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0)
{
printf("alsa-init: unable to get buffersize in hw-params: %s\n", snd_strerror(err));
return(0);
} else
{
ao_data.buffersize = err;
if (verbose) {printf("alsa-init: got buffersize %i\n", ao_data.buffersize);}
}
if (MAX_OUTBURST > ao_data.buffersize) { //warning if MAX_OUTBURST is bigger than buffersize
printf("alsa-init: WARNING! MAX_OUTBURST exceeds your available buffersize.\nalsa-init: MAX_OUTBURST=%i, buffersize=%i\n",MAX_OUTBURST,ao_data.buffersize);}
if (chunk_size == ao_data.buffersize)
{
printf("alsa-init: Can't use period equal to buffer size (%u == %lu)", chunk_size, (long)buffer_size);
return(0);
}
/* finally install hardware parameters */
if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
{
printf("alsa-init: unable to set hw-parameters: %s\n",
snd_strerror(err));
return(0);
}
// end setting hw-params
#ifdef SW_PARAMS
{
size_t n;
xfer_align = snd_pcm_sw_params_get_xfer_align(alsa_swparams);
if (xfer_align == 0)
xfer_align = 4;
n = (ao_data.buffersize / xfer_align) * xfer_align;
if (start_delay <= 0) {
start_threshold = n + (double) ao_data.samplerate * start_delay / 1000000;
} else {
start_threshold = (double) ao_data.samplerate * start_delay / 1000000;
}
if (start_threshold < 1)
start_threshold = 1;
if (start_threshold > n)
start_threshold = n;
if (stop_delay <= 0) {
stop_threshold = ao_data.buffersize + (double) ao_data.samplerate * stop_delay / 1000000;
} else {
stop_threshold = (double) ao_data.samplerate * stop_delay / 1000000;
}
if (verbose) {
printf("alsa-init: start_threshold=%lu, stop_threshold=%lu\n",start_threshold,stop_threshold);
printf("alsa-init: n=%i\n", n);
}
if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to get parameters: %s\n",snd_strerror(err));
return(0);
}
//set min available frames to consider pcm ready (4)
if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, 4)) < 0)
{
printf("alsa-init: unable to set avail_min %s\n",snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_set_start_threshold(alsa_handler, alsa_swparams, start_threshold)) < 0)
{
printf("alsa-init: unable to set start_threshold %s\n",snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params_set_stop_threshold(alsa_handler, alsa_swparams, stop_threshold)) < 0)
{
printf("alsa-init: unable to set stop_threshold %s\n",snd_strerror(err));
return(0);
}
//transfers stream aligned to 4 in nonblocking-mode it would be 1
if ((err = snd_pcm_sw_params_set_xfer_align(alsa_handler, alsa_swparams, 4)) < 0)
{
printf("alsa-init: unable to set xfer_align: %s\n",snd_strerror(err));
return(0);
}
if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0)
{
printf("alsa-init: unable to install sw-params\n");
return(0);
}
bits_per_sample = snd_pcm_format_physical_width(alsa_format);
bits_per_frame = bits_per_sample * channels;
chunk_bytes = chunk_size * bits_per_frame / 8;
if (verbose) {
printf("alsa-init: bits per sample (bps)=%i, bits per frame (bpf)=%i, chunk_bytes=%i\n",bits_per_sample,bits_per_frame,chunk_bytes);}
}
#endif //end swparams
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err));
return(0);
}
printf("alsa9: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
ao_data.samplerate, ao_data.channels, ao_data.bps, ao_data.buffersize,
snd_pcm_format_description(alsa_format));
return(1);
} // end init
/* close audio device */
static void uninit()
{
int err;
//if (alsa_device != NULL)
//free(alsa_device);
//snd_pcm_hw_params_free(alsa_hwparams);
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_close(alsa_handler)) < 0)
{
printf("alsa-uninit: pcm close error: %s\n", snd_strerror(err));
return;
}
else {
alsa_handler = NULL;
alsa_device = NULL;
printf("alsa-uninit: pcm closed\n");
}
}
static void audio_pause()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err));
return;
}
#ifdef reset
if ((err = snd_pcm_reset(alsa_handler)) < 0)
{
printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err));
return;
}
#endif
}
static void audio_resume()
{
int err;
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-resume: pcm prepare error: %s\n", snd_strerror(err));
return;
}
}
/* stop playing and empty buffers (for seeking/pause) */
static void reset()
{
int err;
if ((err = snd_pcm_drain(alsa_handler)) < 0)
{
printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err));
return;
}
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
{
printf("alsa-reset: pcm prepare error: %s\n", snd_strerror(err));
return;
}
}
#ifndef timersub
#define timersub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_usec = (a)->tv_usec - (b)->tv_usec; \
if ((result)->tv_usec < 0) { \
--(result)->tv_sec; \
(result)->tv_usec += 1000000; \
} \
} while (0)
#endif
/*
plays 'len' bytes of 'data'
returns: number of bytes played
modified last at 26.06.02 by jp
*/
static int play(void* data, int len, int flags)
{
snd_pcm_status_t *status;
int num_frames=len/ao_data.bps;
signed short *output_samples=data;
snd_pcm_sframes_t res = 0;
if (!alsa_handler) {
printf("alsa-play: device configuration error");
return 0;
}
do {
if (res == -EPIPE) { /* underrun */
snd_pcm_status_alloca(&status);
if ((res = snd_pcm_status(alsa_handler, status))<0) {
printf("alsa-play: buffer underrun. can't determine length");
} else {
if (snd_pcm_status_get_state(status) == SND_PCM_STATE_XRUN) {
struct timeval now, diff, tstamp;
gettimeofday(&now, 0);
snd_pcm_status_get_trigger_tstamp(status, &tstamp);
timersub(&now, &tstamp, &diff);
printf("alsa-play: xrun of at least %.3f msecs. resetting stream",
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
} else
printf("alsa-play: xrun. can't determine length");
}
res = snd_pcm_prepare(alsa_handler);
}
else if (res == -ESTRPIPE) { /* suspend */
printf("alsa-play: pcm in suspend mode. trying to resume");
while ((res = snd_pcm_resume(alsa_handler)) == -EAGAIN)
sleep(1);
if (res < 0)
res = snd_pcm_prepare(alsa_handler);
}
if (res >= 0)
res = snd_pcm_writei(alsa_handler, (void *)output_samples, num_frames);
if (res > 0) {
output_samples += ao_data.channels * res;
num_frames -= res;
}
} while (res == -EPIPE || num_frames > 0);
if (res < 0) {
printf("alsa-play: write error %s", snd_strerror(res));
return 0;
}
return res < 0 ? (int)res : len;
}
/* how many byes are free in the buffer */
static int get_space()
{
snd_pcm_status_t *status;
int ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = snd_pcm_status_get_avail(status) * ao_data.bps;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
if (ret < 0)
ret = 0;
//printf("alsa-space: free space = %i",ret);
return(ret);
}
/* delay in seconds between first and last sample in buffer */
static float get_delay()
{
snd_pcm_status_t *status;
float ret;
if ((ret = snd_pcm_status_malloc(&status)) < 0)
{
printf("alsa-delay: memory allocation error: %s\n", snd_strerror(ret));
return(0);
}
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
{
printf("alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret));
return(0);
}
switch(snd_pcm_status_get_state(status))
{
case SND_PCM_STATE_OPEN:
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
ret = (float)snd_pcm_status_get_delay(status)/(float)ao_data.samplerate;
break;
default:
ret = 0;
}
snd_pcm_status_free(status);
if (ret < 0)
ret = 0;
return(ret);
}
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