mirror of https://github.com/mpv-player/mpv
1178 lines
32 KiB
C
1178 lines
32 KiB
C
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/*
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ao_alsa9/1.x - ALSA-0.9.x-1.x output plugin for MPlayer
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(C) Alex Beregszaszi
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modified for real alsa-0.9.0-support by Zsolt Barat <joy@streamminister.de>
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additional AC3 passthrough support by Andy Lo A Foe <andy@alsaplayer.org>
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08/22/2002 iec958-init rewritten and merged with common init, zsolt
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04/13/2004 merged with ao_alsa1.x, fixes provided by Jindrich Makovicka
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04/25/2004 printfs converted to mp_msg, Zsolt.
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Any bugreports regarding to this driver are welcome.
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*/
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#include <errno.h>
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#include <sys/time.h>
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#include <stdlib.h>
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#include <math.h>
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#include <string.h>
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#include <sys/poll.h>
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#include "../config.h"
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#include "../mixer.h"
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#include "../mp_msg.h"
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#define ALSA_PCM_NEW_HW_PARAMS_API
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#define ALSA_PCM_NEW_SW_PARAMS_API
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#if HAVE_SYS_ASOUNDLIB_H
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#include <sys/asoundlib.h>
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#elif HAVE_ALSA_ASOUNDLIB_H
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#include <alsa/asoundlib.h>
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#else
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#error "asoundlib.h is not in sys/ or alsa/ - please bugreport"
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#endif
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#include "audio_out.h"
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#include "audio_out_internal.h"
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#include "afmt.h"
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static ao_info_t info =
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{
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"ALSA-0.9.x-1.x audio output",
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"alsa",
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"Alex Beregszaszi, Zsolt Barat <joy@streamminister.de>",
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"under developement"
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};
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LIBAO_EXTERN(alsa)
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static snd_pcm_t *alsa_handler;
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static snd_pcm_format_t alsa_format;
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static snd_pcm_hw_params_t *alsa_hwparams;
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static snd_pcm_sw_params_t *alsa_swparams;
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static char *alsa_device;
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/* possible 4096, original 8192
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* was only needed for calculating chunksize? */
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static int alsa_fragsize = 4096;
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/* 16 sets buffersize to 16 * chunksize is as default 1024
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* which seems to be good avarge for most situations
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* so buffersize is 16384 frames by default */
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static int alsa_fragcount = 16;
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static snd_pcm_uframes_t chunk_size = 1024;//is alsa_fragsize / 4
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#define MIN_CHUNK_SIZE 1024
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static size_t bits_per_sample, bytes_per_sample, bits_per_frame;
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static size_t chunk_bytes;
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int ao_mmap = 0;
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int ao_noblock = 0;
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int first = 1;
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static int open_mode;
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static int set_block_mode;
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static int alsa_can_pause = 0;
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#define ALSA_DEVICE_SIZE 48
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#undef BUFFERTIME
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#undef SET_CHUNKSIZE
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#undef USE_POLL
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/* to set/get/query special features/parameters */
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static int control(int cmd, void *arg)
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{
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switch(cmd) {
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case AOCONTROL_QUERY_FORMAT:
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return CONTROL_TRUE;
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#ifndef WORDS_BIGENDIAN
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case AOCONTROL_GET_VOLUME:
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case AOCONTROL_SET_VOLUME:
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{
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ao_control_vol_t *vol = (ao_control_vol_t *)arg;
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int err;
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snd_mixer_t *handle;
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snd_mixer_elem_t *elem;
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snd_mixer_selem_id_t *sid;
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static char *mix_name = NULL;
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static char *card = NULL;
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long pmin, pmax;
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long get_vol, set_vol;
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float calc_vol, diff, f_multi;
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if(mix_name == NULL){
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if(mixer_device) {
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card = strdup(mixer_device);
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mix_name = strchr(card, '/');
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if(mix_name) {
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*mix_name++ = 0;
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} else {
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mix_name = "PCM";
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}
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} else {
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mix_name = "PCM";
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card = "default";
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}
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}
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if(ao_data.format == AFMT_AC3)
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return CONTROL_TRUE;
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//allocate simple id
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snd_mixer_selem_id_alloca(&sid);
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//sets simple-mixer index and name
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snd_mixer_selem_id_set_index(sid, 0);
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snd_mixer_selem_id_set_name(sid, mix_name);
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if ((err = snd_mixer_open(&handle, 0)) < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: mixer open error: %s\n", snd_strerror(err));
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return CONTROL_ERROR;
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}
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if ((err = snd_mixer_attach(handle, card)) < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: mixer attach %s error: %s\n",
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card, snd_strerror(err));
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snd_mixer_close(handle);
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return CONTROL_ERROR;
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}
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if ((err = snd_mixer_selem_register(handle, NULL, NULL)) < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: mixer register error: %s\n", snd_strerror(err));
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snd_mixer_close(handle);
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return CONTROL_ERROR;
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}
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err = snd_mixer_load(handle);
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if (err < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: mixer load error: %s\n", snd_strerror(err));
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snd_mixer_close(handle);
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return CONTROL_ERROR;
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}
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elem = snd_mixer_find_selem(handle, sid);
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if (!elem) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: unable to find simple control '%s',%i\n",
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snd_mixer_selem_id_get_name(sid), snd_mixer_selem_id_get_index(sid));
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snd_mixer_close(handle);
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return CONTROL_ERROR;
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}
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snd_mixer_selem_get_playback_volume_range(elem,&pmin,&pmax);
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f_multi = (100 / (float)pmax);
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if (cmd == AOCONTROL_SET_VOLUME) {
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diff = (vol->left+vol->right) / 2;
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set_vol = rint(diff / f_multi);
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if (set_vol < 0)
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set_vol = 0;
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else if (set_vol > pmax)
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set_vol = pmax;
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//setting channels
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if ((err = snd_mixer_selem_set_playback_volume(elem, 0, set_vol)) < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: error setting left channel, %s\n",
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snd_strerror(err));
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return CONTROL_ERROR;
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}
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if ((err = snd_mixer_selem_set_playback_volume(elem, 1, set_vol)) < 0) {
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-control: error setting right channel, %s\n",
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snd_strerror(err));
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return CONTROL_ERROR;
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}
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mp_msg(MSGT_AO,MSGL_DBG2,"diff=%f, set_vol=%li, pmax=%li, mult=%f\n",
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diff, set_vol, pmax, f_multi);
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}
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else {
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snd_mixer_selem_get_playback_volume(elem, 0, &get_vol);
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calc_vol = get_vol;
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calc_vol = rintf(calc_vol * f_multi);
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vol->left = vol->right = (int)calc_vol;
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mp_msg(MSGT_AO,MSGL_DBG2,"get_vol = %li, calc=%f\n",get_vol, calc_vol);
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}
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snd_mixer_close(handle);
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return CONTROL_OK;
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}
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#endif
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} //end switch
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return(CONTROL_UNKNOWN);
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}
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/*
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open & setup audio device
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return: 1=success 0=fail
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*/
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static int init(int rate_hz, int channels, int format, int flags)
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{
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int err;
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int cards = -1;
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int period_val;
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snd_pcm_info_t *alsa_info;
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char *str_block_mode;
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int device_set = 0;
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int dir = 0;
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snd_pcm_uframes_t bufsize;
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mp_msg(MSGT_AO,MSGL_V,"alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz,
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channels, audio_out_format_name(format));
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alsa_handler = NULL;
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mp_msg(MSGT_AO,MSGL_V,"alsa-init: compiled for ALSA-%s\n", SND_LIB_VERSION_STR);
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if ((err = snd_card_next(&cards)) < 0 || cards < 0)
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{
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: no soundcards found: %s\n", snd_strerror(err));
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return(0);
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}
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ao_data.samplerate = rate_hz;
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ao_data.bps = channels * rate_hz;
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ao_data.format = format;
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ao_data.channels = channels;
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ao_data.outburst = OUTBURST;
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switch (format)
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{
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case AFMT_S8:
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alsa_format = SND_PCM_FORMAT_S8;
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break;
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case AFMT_U8:
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alsa_format = SND_PCM_FORMAT_U8;
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break;
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case AFMT_U16_LE:
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alsa_format = SND_PCM_FORMAT_U16_LE;
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break;
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case AFMT_U16_BE:
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alsa_format = SND_PCM_FORMAT_U16_BE;
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break;
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#ifndef WORDS_BIGENDIAN
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case AFMT_AC3:
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#endif
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case AFMT_S16_LE:
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alsa_format = SND_PCM_FORMAT_S16_LE;
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break;
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#ifdef WORDS_BIGENDIAN
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case AFMT_AC3:
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#endif
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case AFMT_S16_BE:
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alsa_format = SND_PCM_FORMAT_S16_BE;
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break;
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case AFMT_S32_LE:
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alsa_format = SND_PCM_FORMAT_S32_LE;
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break;
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case AFMT_S32_BE:
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alsa_format = SND_PCM_FORMAT_S32_BE;
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break;
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default:
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alsa_format = SND_PCM_FORMAT_MPEG; //? default should be -1
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break;
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}
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//setting bw according to the input-format. resolution seems to be always s16_le or
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//u16_le so 32bit is probably obsolet.
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switch(alsa_format)
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{
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case SND_PCM_FORMAT_S16_LE:
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case SND_PCM_FORMAT_U16_LE:
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ao_data.bps *= 2;
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break;
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case SND_PCM_FORMAT_S32_LE:
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case SND_PCM_FORMAT_S32_BE:
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ao_data.bps *= 4;
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break;
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case -1:
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: invalid format (%s) requested - output disabled\n",
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audio_out_format_name(format));
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return(0);
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break;
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default:
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ao_data.bps *= 2;
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mp_msg(MSGT_AO,MSGL_WARN,"alsa-init: couldn't convert to right format. setting bps to: %d", ao_data.bps);
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}
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if (ao_subdevice) {
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//start parsing ao_subdevice, ugly and not thread safe!
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//maybe there's a better way?
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int i2 = 1;
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int i3 = 0;
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char *sub_str;
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char *token_str[3];
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char* test_str = strdup(ao_subdevice);
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if ((strcspn(ao_subdevice, ":")) > 0) {
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sub_str = strtok(test_str, ":");
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*(token_str) = sub_str;
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while (((sub_str = strtok(NULL, ":")) != NULL) && (i2 <= 3)) {
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*(token_str+i2) = sub_str;
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i2 += 1;
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}
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for (i3=0; i3 <= i2-1; i3++) {
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if (strcmp(*(token_str + i3), "mmap") == 0) {
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ao_mmap = 1;
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}
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else if (strcmp(*(token_str+i3), "noblock") == 0) {
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ao_noblock = 1;
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}
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else if (strcmp(*(token_str+i3), "hw") == 0) {
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if ((i3 < i2-1) && (strcmp(*(token_str+i3+1), "noblock") != 0) && (strcmp(*(token_str+i3+1), "mmap") != 0)) {
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char *tmp;
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alsa_device = alloca(ALSA_DEVICE_SIZE);
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snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%s", *(token_str+(i3+1)));
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if ((tmp = strrchr(alsa_device, '.')) && isdigit(*(tmp+1)))
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*tmp = ',';
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device_set = 1;
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}
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else {
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alsa_device = *(token_str+i3);
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device_set = 1;
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}
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}
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else if (device_set == 0 && (!ao_mmap || !ao_noblock)) {
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alsa_device = *(token_str+i3);
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device_set = 1;
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}
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}
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}
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} else { //end parsing ao_subdevice
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/* in any case for multichannel playback we should select
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* appropriate device
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*/
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char devstr[128];
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switch (channels) {
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case 1:
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case 2:
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mp_msg(MSGT_AO,MSGL_V,"alsa-init: setup for 1/2 channel(s)\n");
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break;
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case 4:
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strcpy(devstr, "surround40");
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alsa_device = devstr;
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mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround40\n");
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break;
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case 6:
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strcpy(devstr, "surround51");
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alsa_device = devstr;
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mp_msg(MSGT_AO,MSGL_V,"alsa-init: device set to surround51\n");
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break;
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default:
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mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: %d channels are not supported\n",channels);
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}
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}
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/* switch for spdif
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* sets opening sequence for SPDIF
|
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* sets also the playback and other switches 'on the fly'
|
||
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* while opening the abstract alias for the spdif subdevice
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* 'iec958'
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||
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*/
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if (format == AFMT_AC3) {
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char devstr[128];
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unsigned char s[4];
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//int err, c; //unused
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switch (channels) {
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case 1:
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case 2:
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s[0] = IEC958_AES0_NONAUDIO |
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IEC958_AES0_CON_EMPHASIS_NONE;
|
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s[1] = IEC958_AES1_CON_ORIGINAL |
|
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IEC958_AES1_CON_PCM_CODER;
|
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s[2] = 0;
|
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s[3] = IEC958_AES3_CON_FS_48000;
|
||
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sprintf(devstr, "iec958:AES0=0x%x,AES1=0x%x,AES2=0x%x,AES3=0x%x",
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s[0], s[1], s[2], s[3]);
|
||
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mp_msg(MSGT_AO,MSGL_V,"alsa-spdif-init: playing AC3, %i channels\n", channels);
|
||
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break;
|
||
|
case 4:
|
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strcpy(devstr, "surround40");
|
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break;
|
||
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||
|
case 6:
|
||
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strcpy(devstr, "surround51");
|
||
|
break;
|
||
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|
default:
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-spdif-init: %d channels are not supported\n", channels);
|
||
|
}
|
||
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|
||
|
alsa_device = devstr;
|
||
|
}
|
||
|
|
||
|
if (alsa_device == NULL)
|
||
|
{
|
||
|
int tmp_device, tmp_subdevice, err;
|
||
|
|
||
|
if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: memory allocation error: %s\n", snd_strerror(err));
|
||
|
}
|
||
|
|
||
|
if ((alsa_device = alloca(ALSA_DEVICE_SIZE)) == NULL)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: memory allocation error: %s\n", strerror(errno));
|
||
|
}
|
||
|
|
||
|
if ((tmp_device = snd_pcm_info_get_device(alsa_info)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: can't get device\n");
|
||
|
}
|
||
|
|
||
|
if ((tmp_subdevice = snd_pcm_info_get_subdevice(alsa_info)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: can't get subdevice\n");
|
||
|
}
|
||
|
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: got device=%i, subdevice=%i\n",
|
||
|
tmp_device, tmp_subdevice);
|
||
|
|
||
|
//we are setting here device to default cause it could be configured by the user
|
||
|
//if its not set by the user, it defaults to hw:0,0
|
||
|
if ((err = snprintf(alsa_device, ALSA_DEVICE_SIZE, "default")) <= 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: can't write device-id\n");
|
||
|
}
|
||
|
|
||
|
snd_pcm_info_free(alsa_info);
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: %d soundcard%s found, using: %s\n", cards+1,(cards >= 0) ? "" : "s", alsa_device);
|
||
|
} else if (strcmp(alsa_device, "help") == 0) {
|
||
|
printf("alsa-help: available options are:\n");
|
||
|
printf(" mmap: sets mmap-mode\n");
|
||
|
printf(" noblock: sets noblock-mode\n");
|
||
|
printf(" device-name: sets device name (change comma to point)\n");
|
||
|
printf(" example -ao alsa9:mmap:noblock:hw:0.3 sets noblock-mode,\n");
|
||
|
printf(" mmap-mode and the device-name as first card fourth device\n");
|
||
|
return(0);
|
||
|
} else {
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: soundcard set to %s\n", alsa_device);
|
||
|
}
|
||
|
|
||
|
//setting modes for block or nonblock-mode
|
||
|
if (ao_noblock) {
|
||
|
open_mode = SND_PCM_NONBLOCK;
|
||
|
set_block_mode = 1;
|
||
|
str_block_mode = "nonblock-mode";
|
||
|
}
|
||
|
else {
|
||
|
open_mode = 0;
|
||
|
set_block_mode = 0;
|
||
|
str_block_mode = "block-mode";
|
||
|
}
|
||
|
|
||
|
//sets buff/chunksize if its set manually
|
||
|
if (ao_data.buffersize) {
|
||
|
switch (ao_data.buffersize)
|
||
|
{
|
||
|
case 1:
|
||
|
alsa_fragcount = 16;
|
||
|
chunk_size = 512;
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 8192\n");
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 512\n");
|
||
|
break;
|
||
|
case 2:
|
||
|
alsa_fragcount = 8;
|
||
|
chunk_size = 1024;
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 8192\n");
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 1024\n");
|
||
|
break;
|
||
|
case 3:
|
||
|
alsa_fragcount = 32;
|
||
|
chunk_size = 512;
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 16384\n");
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 512\n");
|
||
|
break;
|
||
|
case 4:
|
||
|
alsa_fragcount = 16;
|
||
|
chunk_size = 1024;
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: buffersize set manually to 16384\n");
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set manually to 1024\n");
|
||
|
break;
|
||
|
default:
|
||
|
alsa_fragcount = 16;
|
||
|
if (ao_mmap)
|
||
|
chunk_size = 512;
|
||
|
else
|
||
|
chunk_size = 1024;
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (!alsa_handler) {
|
||
|
//modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC
|
||
|
if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, open_mode)) < 0)
|
||
|
{
|
||
|
if (err != -EBUSY && ao_noblock) {
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: open in nonblock-mode failed, trying to open in block-mode\n");
|
||
|
if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: playback open error: %s\n", snd_strerror(err));
|
||
|
return(0);
|
||
|
} else {
|
||
|
set_block_mode = 0;
|
||
|
str_block_mode = "block-mode";
|
||
|
}
|
||
|
} else {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: playback open error: %s\n", snd_strerror(err));
|
||
|
return(0);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_nonblock(alsa_handler, set_block_mode)) < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: error set block-mode %s\n", snd_strerror(err));
|
||
|
} else {
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: pcm opend in %s\n", str_block_mode);
|
||
|
}
|
||
|
|
||
|
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)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to get initial parameters: %s\n",
|
||
|
snd_strerror(err));
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
if (ao_mmap) {
|
||
|
snd_pcm_access_mask_t *mask = alloca(snd_pcm_access_mask_sizeof());
|
||
|
snd_pcm_access_mask_none(mask);
|
||
|
snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_INTERLEAVED);
|
||
|
snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_NONINTERLEAVED);
|
||
|
snd_pcm_access_mask_set(mask, SND_PCM_ACCESS_MMAP_COMPLEX);
|
||
|
err = snd_pcm_hw_params_set_access_mask(alsa_handler, alsa_hwparams, mask);
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: mmap set\n");
|
||
|
} else {
|
||
|
err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,
|
||
|
SND_PCM_ACCESS_RW_INTERLEAVED);
|
||
|
}
|
||
|
if (err < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set access type: %s\n",
|
||
|
snd_strerror(err));
|
||
|
return (0);
|
||
|
}
|
||
|
|
||
|
/* workaround for nonsupported formats
|
||
|
sets default format to S16_LE if the given formats aren't supported */
|
||
|
if ((err = snd_pcm_hw_params_test_format(alsa_handler, alsa_hwparams,
|
||
|
alsa_format)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,
|
||
|
"alsa-init: format %s are not supported by hardware, trying default\n",
|
||
|
audio_out_format_name(format));
|
||
|
alsa_format = SND_PCM_FORMAT_S16_LE;
|
||
|
ao_data.format = AFMT_S16_LE;
|
||
|
ao_data.bps = channels * rate_hz * 2;
|
||
|
}
|
||
|
|
||
|
bytes_per_sample = ao_data.bps / ao_data.samplerate; //it should be here
|
||
|
|
||
|
|
||
|
if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams,
|
||
|
alsa_format)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set format: %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams,
|
||
|
ao_data.channels)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set channels: %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_hw_params_set_rate_near(alsa_handler, alsa_hwparams,
|
||
|
&ao_data.samplerate, &dir)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set samplerate-2: %s\n",
|
||
|
snd_strerror(err));
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
#ifdef BUFFERTIME
|
||
|
{
|
||
|
int alsa_buffer_time = 500000; /* original 60 */
|
||
|
int alsa_period_time;
|
||
|
alsa_period_time = alsa_buffer_time/4;
|
||
|
if ((err = snd_pcm_hw_params_set_buffer_time_near(alsa_handler, alsa_hwparams,
|
||
|
&alsa_buffer_time, &dir)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"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_period_time, &dir)) < 0)
|
||
|
/* original: alsa_buffer_time/ao_data.bps */
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set period time: %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-init: buffer_time: %d, period_time :%d\n",
|
||
|
alsa_buffer_time, err);
|
||
|
}
|
||
|
#endif//end SET_BUFFERTIME
|
||
|
|
||
|
#ifdef SET_CHUNKSIZE
|
||
|
{
|
||
|
//set chunksize
|
||
|
dir=0;
|
||
|
if ((err = snd_pcm_hw_params_set_period_size_near(alsa_handler, alsa_hwparams,
|
||
|
&chunk_size, &dir)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set periodsize(%d): %s\n",
|
||
|
chunk_size, snd_strerror(err));
|
||
|
}
|
||
|
else {
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: chunksize set to %i\n", chunk_size);
|
||
|
}
|
||
|
if ((err = snd_pcm_hw_params_set_periods_near(alsa_handler, alsa_hwparams,
|
||
|
&alsa_fragcount, &dir)) < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set periods: %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
else {
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: fragcount=%i\n", alsa_fragcount);
|
||
|
}
|
||
|
}
|
||
|
#endif//end SET_CHUNKSIZE
|
||
|
|
||
|
/* finally install hardware parameters */
|
||
|
if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set hw-parameters: %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
// end setting hw-params
|
||
|
|
||
|
|
||
|
// gets buffersize for control
|
||
|
if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams, &bufsize)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to get buffersize: %s\n", snd_strerror(err));
|
||
|
}
|
||
|
else {
|
||
|
ao_data.buffersize = bufsize * bytes_per_sample;
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: got buffersize=%i\n", ao_data.buffersize);
|
||
|
}
|
||
|
|
||
|
// setting sw-params (only avail-min) if noblocking mode was choosed
|
||
|
if (ao_noblock)
|
||
|
{
|
||
|
|
||
|
if ((err = snd_pcm_sw_params_current(alsa_handler, alsa_swparams)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to get parameters: %s\n",
|
||
|
snd_strerror(err));
|
||
|
|
||
|
}
|
||
|
|
||
|
//set min available frames to consider pcm ready (4)
|
||
|
//increased for nonblock-mode should be set dynamically later
|
||
|
if ((err = snd_pcm_sw_params_set_avail_min(alsa_handler, alsa_swparams, 4)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to set avail_min %s\n",
|
||
|
snd_strerror(err));
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: unable to install sw-params\n");
|
||
|
}
|
||
|
|
||
|
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;
|
||
|
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-init: bits per sample (bps)=%i, bits per frame (bpf)=%i, chunk_bytes=%i\n",bits_per_sample,bits_per_frame,chunk_bytes);}
|
||
|
//end swparams
|
||
|
|
||
|
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-init: pcm prepare error: %s\n", snd_strerror(err));
|
||
|
}
|
||
|
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa: %d Hz/%d channels/%d bpf/%d bytes buffer/%s\n",
|
||
|
ao_data.samplerate, ao_data.channels, bytes_per_sample, ao_data.buffersize,
|
||
|
snd_pcm_format_description(alsa_format));
|
||
|
|
||
|
} // end switch alsa_handler (spdif)
|
||
|
alsa_can_pause = snd_pcm_hw_params_can_pause(alsa_hwparams);
|
||
|
return(1);
|
||
|
} // end init
|
||
|
|
||
|
|
||
|
/* close audio device */
|
||
|
static void uninit(int immed)
|
||
|
{
|
||
|
|
||
|
if (alsa_handler) {
|
||
|
int err;
|
||
|
|
||
|
if (!ao_noblock) {
|
||
|
if ((err = snd_pcm_drop(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-uninit: pcm drop error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_close(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-uninit: pcm close error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
else {
|
||
|
alsa_handler = NULL;
|
||
|
alsa_device = NULL;
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-uninit: pcm closed\n");
|
||
|
}
|
||
|
}
|
||
|
else {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-uninit: no handler defined!\n");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void audio_pause()
|
||
|
{
|
||
|
int err;
|
||
|
|
||
|
if (alsa_can_pause) {
|
||
|
if ((err = snd_pcm_pause(alsa_handler, 1)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-pause: pcm pause error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-pause: pause supported by hardware\n");
|
||
|
} else {
|
||
|
if ((err = snd_pcm_drop(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-pause: pcm drop error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
static void audio_resume()
|
||
|
{
|
||
|
int err;
|
||
|
|
||
|
if (alsa_can_pause) {
|
||
|
if ((err = snd_pcm_pause(alsa_handler, 0)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-resume: pcm resume error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-resume: resume supported by hardware\n");
|
||
|
} else {
|
||
|
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"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_drop(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-reset: pcm drop error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
if ((err = snd_pcm_prepare(alsa_handler)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-reset: pcm prepare error: %s\n", snd_strerror(err));
|
||
|
return;
|
||
|
}
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
#ifdef USE_POLL
|
||
|
static int wait_for_poll(snd_pcm_t *handle, struct pollfd *ufds, unsigned int count)
|
||
|
{
|
||
|
unsigned short revents;
|
||
|
|
||
|
while (1) {
|
||
|
poll(ufds, count, -1);
|
||
|
snd_pcm_poll_descriptors_revents(handle, ufds, count, &revents);
|
||
|
if (revents & POLLERR)
|
||
|
return -EIO;
|
||
|
if (revents & POLLOUT)
|
||
|
return 0;
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
#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
|
||
|
|
||
|
/* I/O error handler */
|
||
|
static int xrun(u_char *str_mode)
|
||
|
{
|
||
|
int err;
|
||
|
snd_pcm_status_t *status;
|
||
|
|
||
|
snd_pcm_status_alloca(&status);
|
||
|
|
||
|
if ((err = snd_pcm_status(alsa_handler, status))<0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"status error: %s", snd_strerror(err));
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-%s: xrun of at least %.3f msecs. resetting stream\n",
|
||
|
str_mode,
|
||
|
diff.tv_sec * 1000 + diff.tv_usec / 1000.0);
|
||
|
}
|
||
|
|
||
|
if ((err = snd_pcm_prepare(alsa_handler))<0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"xrun: prepare error: %s", snd_strerror(err));
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
return(1); /* ok, data should be accepted again */
|
||
|
}
|
||
|
|
||
|
static int play_normal(void* data, int len);
|
||
|
static int play_mmap(void* data, int len);
|
||
|
|
||
|
static int play(void* data, int len, int flags)
|
||
|
{
|
||
|
int result;
|
||
|
if (ao_mmap)
|
||
|
result = play_mmap(data, len);
|
||
|
else
|
||
|
result = play_normal(data, len);
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
plays 'len' bytes of 'data'
|
||
|
returns: number of bytes played
|
||
|
modified last at 29.06.02 by jp
|
||
|
thanxs for marius <marius@rospot.com> for giving us the light ;)
|
||
|
*/
|
||
|
|
||
|
static int play_normal(void* data, int len)
|
||
|
{
|
||
|
|
||
|
//bytes_per_sample is always 4 for 2 chn S16_LE
|
||
|
int num_frames = len / bytes_per_sample;
|
||
|
char *output_samples = (char *)data;
|
||
|
snd_pcm_sframes_t res = 0;
|
||
|
|
||
|
//mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: frames=%i, len=%i\n",num_frames,len);
|
||
|
|
||
|
if (!alsa_handler) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: device configuration error");
|
||
|
return 0;
|
||
|
}
|
||
|
|
||
|
while (num_frames > 0) {
|
||
|
|
||
|
res = snd_pcm_writei(alsa_handler, (void *)output_samples, num_frames);
|
||
|
|
||
|
if (res == -EAGAIN) {
|
||
|
snd_pcm_wait(alsa_handler, 1000);
|
||
|
}
|
||
|
else if (res == -EPIPE) { /* underrun */
|
||
|
if (xrun("play") <= 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: xrun reset error");
|
||
|
return(0);
|
||
|
}
|
||
|
}
|
||
|
else if (res == -ESTRPIPE) { /* suspend */
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-play: pcm in suspend mode. trying to resume\n");
|
||
|
while ((res = snd_pcm_resume(alsa_handler)) == -EAGAIN)
|
||
|
sleep(1);
|
||
|
}
|
||
|
else if (res < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_INFO,"alsa-play: unknown status, trying to reset soundcard\n");
|
||
|
if ((res = snd_pcm_prepare(alsa_handler)) < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: snd prepare error");
|
||
|
return(0);
|
||
|
break;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (res > 0) {
|
||
|
|
||
|
/* output_samples += ao_data.channels * res; */
|
||
|
output_samples += res * bytes_per_sample;
|
||
|
|
||
|
num_frames -= res;
|
||
|
}
|
||
|
|
||
|
} //end while
|
||
|
|
||
|
if (res < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-play: write error %s", snd_strerror(res));
|
||
|
return 0;
|
||
|
}
|
||
|
return res < 0 ? (int)res : len - len % bytes_per_sample;
|
||
|
}
|
||
|
|
||
|
/* mmap-mode mainly based on descriptions by Joshua Haberman <joshua@haberman.com>
|
||
|
* 'An overview of the ALSA API' http://people.debian.org/~joshua/x66.html
|
||
|
* and some help by Paul Davis <pbd@op.net> */
|
||
|
|
||
|
static int play_mmap(void* data, int len)
|
||
|
{
|
||
|
snd_pcm_sframes_t commitres, frames_available;
|
||
|
snd_pcm_uframes_t frames_transmit, size, offset;
|
||
|
const snd_pcm_channel_area_t *area;
|
||
|
void *outbuffer;
|
||
|
int err, result;
|
||
|
|
||
|
#ifdef USE_POLL //seems not really be needed
|
||
|
struct pollfd *ufds;
|
||
|
int count;
|
||
|
|
||
|
count = snd_pcm_poll_descriptors_count (alsa_handler);
|
||
|
ufds = malloc(sizeof(struct pollfd) * count);
|
||
|
snd_pcm_poll_descriptors(alsa_handler, ufds, count);
|
||
|
|
||
|
//first wait_for_poll
|
||
|
if (err = (wait_for_poll(alsa_handler, ufds, count) < 0)) {
|
||
|
if (snd_pcm_state(alsa_handler) == SND_PCM_STATE_XRUN ||
|
||
|
snd_pcm_state(alsa_handler) == SND_PCM_STATE_SUSPENDED) {
|
||
|
xrun("play");
|
||
|
}
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
outbuffer = alloca(ao_data.buffersize);
|
||
|
|
||
|
//don't trust get_space() ;)
|
||
|
frames_available = snd_pcm_avail_update(alsa_handler) * bytes_per_sample;
|
||
|
if (frames_available < 0)
|
||
|
xrun("play");
|
||
|
|
||
|
if (frames_available < 4) {
|
||
|
if (first) {
|
||
|
first = 0;
|
||
|
snd_pcm_start(alsa_handler);
|
||
|
}
|
||
|
else { //FIXME should break and return 0?
|
||
|
snd_pcm_wait(alsa_handler, -1);
|
||
|
first = 1;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/* len is simply the available bufferspace got by get_space()
|
||
|
* but real avail_buffer in frames is ab/bytes_per_sample */
|
||
|
size = len / bytes_per_sample;
|
||
|
|
||
|
//mp_msg(MSGT_AO,MSGL_V,"len: %i size %i, f_avail %i, bps %i ...\n", len, size, frames_available, bytes_per_sample);
|
||
|
|
||
|
frames_transmit = size;
|
||
|
|
||
|
/* prepare areas and set sw-pointers
|
||
|
* frames_transmit returns the real available buffer-size
|
||
|
* sometimes != frames_available cause of ringbuffer 'emulation' */
|
||
|
snd_pcm_mmap_begin(alsa_handler, &area, &offset, &frames_transmit);
|
||
|
|
||
|
/* this is specific to interleaved streams (or non-interleaved
|
||
|
* streams with only one channel) */
|
||
|
outbuffer = ((char *) area->addr + (area->first + area->step * offset) / 8); //8
|
||
|
|
||
|
//write data
|
||
|
memcpy(outbuffer, data, (frames_transmit * bytes_per_sample));
|
||
|
|
||
|
commitres = snd_pcm_mmap_commit(alsa_handler, offset, frames_transmit);
|
||
|
|
||
|
if (commitres < 0 || commitres != frames_transmit) {
|
||
|
if (snd_pcm_state(alsa_handler) == SND_PCM_STATE_XRUN ||
|
||
|
snd_pcm_state(alsa_handler) == SND_PCM_STATE_SUSPENDED) {
|
||
|
xrun("play");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
//mp_msg(MSGT_AO,MSGL_V,"mmap ft: %i, cres: %i\n", frames_transmit, commitres);
|
||
|
|
||
|
/* err = snd_pcm_area_copy(&area, offset, &data, offset, len, alsa_format); */
|
||
|
/* if (err < 0) { */
|
||
|
/* mp_msg(MSGT_AO,MSGL_ERR,"area-copy-error\n"); */
|
||
|
/* return 0; */
|
||
|
/* } */
|
||
|
|
||
|
|
||
|
//calculate written frames!
|
||
|
result = commitres * bytes_per_sample;
|
||
|
|
||
|
|
||
|
/* if (verbose) { */
|
||
|
/* if (len == result) */
|
||
|
/* mp_msg(MSGT_AO,MSGL_V,"result: %i, frames written: %i ...\n", result, frames_transmit); */
|
||
|
/* else */
|
||
|
/* mp_msg(MSGT_AO,MSGL_V,"result: %i, frames written: %i, result != len ...\n", result, frames_transmit); */
|
||
|
/* } */
|
||
|
|
||
|
//mplayer doesn't like -result
|
||
|
if (result < 0)
|
||
|
result = 0;
|
||
|
|
||
|
#ifdef USE_POLL
|
||
|
free(ufds);
|
||
|
#endif
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/* how many byes are free in the buffer */
|
||
|
static int get_space()
|
||
|
{
|
||
|
snd_pcm_status_t *status;
|
||
|
int ret;
|
||
|
char *str_status;
|
||
|
|
||
|
//snd_pcm_sframes_t avail_frames = 0;
|
||
|
|
||
|
if ((ret = snd_pcm_status_malloc(&status)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-space: memory allocation error: %s\n", snd_strerror(ret));
|
||
|
return(0);
|
||
|
}
|
||
|
|
||
|
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"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:
|
||
|
str_status = "open";
|
||
|
case SND_PCM_STATE_PREPARED:
|
||
|
if (str_status != "open") {
|
||
|
str_status = "prepared";
|
||
|
first = 1;
|
||
|
ret = snd_pcm_status_get_avail(status) * bytes_per_sample;
|
||
|
if (ret == 0) //ugly workaround for hang in mmap-mode
|
||
|
ret = 10;
|
||
|
break;
|
||
|
}
|
||
|
case SND_PCM_STATE_RUNNING:
|
||
|
ret = snd_pcm_status_get_avail(status) * bytes_per_sample;
|
||
|
//avail_frames = snd_pcm_avail_update(alsa_handler) * bytes_per_sample;
|
||
|
if (str_status != "open" && str_status != "prepared")
|
||
|
str_status = "running";
|
||
|
break;
|
||
|
case SND_PCM_STATE_PAUSED:
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-space: paused");
|
||
|
str_status = "paused";
|
||
|
ret = 0;
|
||
|
break;
|
||
|
case SND_PCM_STATE_XRUN:
|
||
|
xrun("space");
|
||
|
str_status = "xrun";
|
||
|
first = 1;
|
||
|
ret = 0;
|
||
|
break;
|
||
|
default:
|
||
|
str_status = "undefined";
|
||
|
ret = snd_pcm_status_get_avail(status) * bytes_per_sample;
|
||
|
if (ret <= 0) {
|
||
|
xrun("space");
|
||
|
}
|
||
|
}
|
||
|
|
||
|
if (str_status != "running")
|
||
|
mp_msg(MSGT_AO,MSGL_V,"alsa-space: free space = %i, status=%i, %s --\n", ret, status, str_status);
|
||
|
snd_pcm_status_free(status);
|
||
|
|
||
|
if (ret < 0) {
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"negative value!!\n");
|
||
|
ret = 0;
|
||
|
}
|
||
|
|
||
|
// workaround for too small value returned
|
||
|
if (ret < MIN_CHUNK_SIZE)
|
||
|
ret = 0;
|
||
|
|
||
|
return(ret);
|
||
|
}
|
||
|
|
||
|
/* delay in seconds between first and last sample in buffer */
|
||
|
static float get_delay()
|
||
|
{
|
||
|
|
||
|
if (alsa_handler) {
|
||
|
|
||
|
snd_pcm_status_t *status;
|
||
|
float ret;
|
||
|
|
||
|
if ((ret = snd_pcm_status_malloc(&status)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-delay: memory allocation error: %s\n", snd_strerror(ret));
|
||
|
}
|
||
|
|
||
|
if ((ret = snd_pcm_status(alsa_handler, status)) < 0)
|
||
|
{
|
||
|
mp_msg(MSGT_AO,MSGL_ERR,"alsa-delay: cannot get pcm status: %s\n", snd_strerror(ret));
|
||
|
}
|
||
|
|
||
|
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);
|
||
|
|
||
|
} else {
|
||
|
return(0);
|
||
|
}
|
||
|
}
|