mirror of https://github.com/mpv-player/mpv
972 lines
25 KiB
C
972 lines
25 KiB
C
/*
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ao_alsa9 - ALSA-0.9.x output plugin for MPlayer
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(C) Alex Beregszaszi <alex@naxine.org>
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modified for better alsa-0.9.0beta12(rc1)-support by Joy Winter <joy@pingfm.org>
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additional AC3 passthrough support by Andy Lo A Foe <andy@alsaplayer.org>
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Any bugreports regarding to this driver are welcome either to the mplayer-user-mailinglist or directly to the authors.
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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 "../config.h"
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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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extern int verbose;
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static ao_info_t info =
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{
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"ALSA-0.9.x audio output",
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"alsa9",
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"Alex Beregszaszi <alex@naxine.org>, Joy Winter <joy@pingfm.org>",
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"under developement"
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};
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LIBAO_EXTERN(alsa9)
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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, OUTBURST is set statically to 512 in config.h */
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static int alsa_fragsize = 4096; //OUTBURST
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static int alsa_fragcount = 8;
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static int chunk_size = -1;
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static size_t bits_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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static int open_mode;
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static int set_block_mode;
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#define ALSA_DEVICE_SIZE 48
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#undef BUFFERTIME
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#define SET_CHUNKSIZE
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snd_pcm_t *
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spdif_init(int acard, int adevice)
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{
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//char *pcm_name = "hw:0,2"; /* first card second device */
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char pcm_name[255];
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static snd_aes_iec958_t spdif;
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snd_pcm_info_t *info;
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snd_pcm_t *handler;
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snd_pcm_format_t format = SND_PCM_FORMAT_S16_LE;
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unsigned int channels = 2;
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unsigned int rate = 48000;
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int err, c;
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if (err = snprintf(&pcm_name[0], 11, "hw:%1d,%1d", acard, adevice) <= 0)
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{
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return NULL;
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}
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if ((err = snd_pcm_open(&handler, pcm_name, SND_PCM_STREAM_PLAYBACK, 0)) < 0)
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{
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fprintf(stderr, "open: %s\n", snd_strerror(err));
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return NULL;
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}
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snd_pcm_info_alloca(&info);
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if ((err = snd_pcm_info(handler, info)) < 0) {
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fprintf(stderr, "info: %s\n", snd_strerror(err));
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snd_pcm_close(handler);
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return NULL;
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}
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printf("device: %d, subdevice: %d\n", snd_pcm_info_get_device(info),
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snd_pcm_info_get_subdevice(info));
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{
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snd_ctl_elem_value_t *ctl;
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snd_ctl_t *ctl_handler;
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char ctl_name[12];
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int ctl_card;
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spdif.status[0] = IEC958_AES0_NONAUDIO |
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IEC958_AES0_CON_EMPHASIS_NONE;
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spdif.status[1] = IEC958_AES1_CON_ORIGINAL |
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IEC958_AES1_CON_PCM_CODER;
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spdif.status[2] = 0;
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spdif.status[3] = IEC958_AES3_CON_FS_48000;
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snd_ctl_elem_value_alloca(&ctl);
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snd_ctl_elem_value_set_interface(ctl, SND_CTL_ELEM_IFACE_PCM);
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snd_ctl_elem_value_set_device(ctl, snd_pcm_info_get_device(info));
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snd_ctl_elem_value_set_subdevice(ctl, snd_pcm_info_get_subdevice(info));
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snd_ctl_elem_value_set_name(ctl, SND_CTL_NAME_IEC958("", PLAYBACK,PCM_STREAM));
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snd_ctl_elem_value_set_iec958(ctl, &spdif);
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ctl_card = snd_pcm_info_get_card(info);
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if (ctl_card < 0) {
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fprintf(stderr, "Unable to setup the IEC958 (S/PDIF) interface - PCM has no assigned card");
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goto __diga_end;
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}
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sprintf(ctl_name, "hw:%d", ctl_card);
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printf("hw:%d\n", ctl_card);
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if ((err = snd_ctl_open(&ctl_handler, ctl_name, 0)) < 0) {
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fprintf(stderr, "Unable to open the control interface '%s': %s", ctl_name, snd_strerror(err));
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goto __diga_end;
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}
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if ((err = snd_ctl_elem_write(ctl_handler, ctl)) < 0) {
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fprintf(stderr, "Unable to update the IEC958 control: %s", snd_strerror(err));
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goto __diga_end;
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}
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snd_ctl_close(ctl_handler);
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__diga_end:
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}
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{
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snd_pcm_hw_params_t *params;
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snd_pcm_sw_params_t *swparams;
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snd_pcm_hw_params_alloca(¶ms);
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snd_pcm_sw_params_alloca(&swparams);
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err = snd_pcm_hw_params_any(handler, params);
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if (err < 0) {
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fprintf(stderr, "Broken configuration for this PCM: no configurations available");
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return NULL;
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}
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err = snd_pcm_hw_params_set_access(handler, params,SND_PCM_ACCESS_RW_INTERLEAVED);
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if (err < 0) {
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fprintf(stderr, "Access tyep not available");
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return NULL;
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}
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err = snd_pcm_hw_params_set_format(handler, params, format);
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if (err < 0) {
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fprintf(stderr, "Sample format non available");
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return NULL;
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}
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err = snd_pcm_hw_params_set_channels(handler, params, channels);
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if (err < 0) {
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fprintf(stderr, "Channels count non avaible");
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return NULL;
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}
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err = snd_pcm_hw_params_set_rate_near(handler, params, rate, 0); assert(err >= 0);
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err = snd_pcm_hw_params(handler, params);
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if (err < 0) {
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fprintf(stderr, "Cannot set buffer size\n");
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return NULL;
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}
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snd_pcm_sw_params_current(handler, swparams);
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}
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return handler;
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}
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/* to set/get/query special features/parameters */
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static int control(int cmd, int 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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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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const char *mix_name = "PCM";
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char *card = "default";
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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(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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printf("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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printf("alsa-control: mixer attach %s error: %s", 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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printf("alsa-control: mixer register error: %s", 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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printf("alsa-control: mixer load error: %s", 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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printf("alsa-control: unable to find simple control '%s',%i\n", 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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printf("alsa-control: error setting left channel, %s",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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printf("alsa-control: error setting right channel, %s",snd_strerror(err));
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return CONTROL_ERROR;
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}
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//printf("diff=%f, set_vol=%i, pmax=%i, mult=%f\n", 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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//printf("get_vol = %i, calc=%i\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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}
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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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printf("alsa-init: testing and bugreports are welcome.\n");
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printf("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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if (verbose)
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printf("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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printf("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; /* really this is bytes per frame so bad varname */
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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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ao_data.buffersize = MAX_OUTBURST; // was 16384
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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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default:
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alsa_format = SND_PCM_FORMAT_MPEG;
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break;
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}
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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 -1:
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printf("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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default:
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break;
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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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//printf("subd=%s, test=%s\n", ao_subdevice,test_str);
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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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//printf("token %i: %s\n", i2, *(token_str+i2));
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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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//printf("test %i, %s\n", i3, *(token_str+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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alsa_device = *(token_str+i3);
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}
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else if (!alsa_device || !ao_mmap || !ao_noblock) {
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alsa_device = *(token_str+i3);
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}
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}
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}
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} //end parsing ao_subdevice
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if (alsa_device == NULL)
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{
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int tmp_device, tmp_subdevice, err;
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if ((err = snd_pcm_info_malloc(&alsa_info)) < 0)
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{
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printf("alsa-init: memory allocation error: %s\n", snd_strerror(err));
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return(0);
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}
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if ((alsa_device = alloca(ALSA_DEVICE_SIZE)) == NULL)
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{
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printf("alsa-init: memory allocation error: %s\n", strerror(errno));
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return(0);
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}
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if ((tmp_device = snd_pcm_info_get_device(alsa_info)) < 0)
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{
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printf("alsa-init: cant get device\n");
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return(0);
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}
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if ((tmp_subdevice = snd_pcm_info_get_subdevice(alsa_info)) < 0)
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{
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printf("alsa-init: cant get subdevice\n");
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return(0);
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}
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if (verbose)
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printf("alsa-init: got device=%i, subdevice=%i\n", tmp_device, tmp_subdevice);
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if ((err = snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%1d,%1d", tmp_device, tmp_subdevice)) <= 0)
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{
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printf("alsa-init: cant wrote device-id\n");
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}
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snd_pcm_info_free(alsa_info);
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}
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printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1,
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(cards >= 0) ? "" : "s", alsa_device);
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if (format == AFMT_AC3) {
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// Try to initialize the SPDIF interface
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alsa_handler = spdif_init(0, 2);
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}
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//setting modes for block or nonblock-mode
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if (ao_noblock) {
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open_mode = SND_PCM_NONBLOCK;
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set_block_mode = 1;
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str_block_mode = "nonblock-mode";
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}
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else {
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open_mode = 0;
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set_block_mode = 0;
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str_block_mode = "block-mode";
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}
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//modes = 0, SND_PCM_NONBLOCK, SND_PCM_ASYNC
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if (!alsa_handler) {
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if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, open_mode)) < 0)
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{
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if (ao_noblock) {
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printf("alsa-init: open in nonblock-mode failed, trying to open in block-mode\n");
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if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, 0)) < 0) {
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printf("alsa-init: playback open error: %s\n", snd_strerror(err));
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return(0);
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} else {
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set_block_mode = 0;
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str_block_mode = "block-mode";
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}
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} else {
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printf("alsa-init: playback open error: %s\n", snd_strerror(err));
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return(0);
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}
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}
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}
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if ((err = snd_pcm_nonblock(alsa_handler, set_block_mode)) < 0) {
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printf("alsa-init: error set block-mode %s\n", snd_strerror(err));
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}
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else if (verbose) {
|
|
printf("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)
|
|
{
|
|
printf("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);
|
|
printf("alsa-init: mmap set\n");
|
|
} else {
|
|
err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams,SND_PCM_ACCESS_RW_INTERLEAVED);
|
|
printf("alsa-init: interleave set\n");
|
|
}
|
|
if (err < 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));
|
|
return(0);
|
|
}
|
|
|
|
#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
|
|
|
|
#ifdef SET_CHUNKSIZE
|
|
{
|
|
//set chunksize
|
|
chunk_size = alsa_fragsize / 4;
|
|
|
|
if ((err = snd_pcm_hw_params_set_period_size(alsa_handler, alsa_hwparams, chunk_size, 0)) < 0)
|
|
{
|
|
printf("alsa-init: unable to set periodsize: %s\n", snd_strerror(err));
|
|
return(0);
|
|
}
|
|
else if (verbose) {
|
|
printf("alsa-init: chunksize set to %i\n", chunk_size);
|
|
}
|
|
|
|
//set period_count
|
|
if ((period_val = snd_pcm_hw_params_get_periods_max(alsa_hwparams, 0)) < alsa_fragcount) {
|
|
alsa_fragcount = period_val;
|
|
}
|
|
|
|
if (verbose)
|
|
printf("alsa-init: current val=%i, fragcount=%i\n", period_val, alsa_fragcount);
|
|
|
|
if ((err = snd_pcm_hw_params_set_periods(alsa_handler, alsa_hwparams, alsa_fragcount, 0)) < 0) {
|
|
printf("alsa-init: unable to set periods: %s\n", snd_strerror(err));
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* 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
|
|
|
|
|
|
// gets buffersize for control
|
|
if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0)
|
|
{
|
|
printf("alsa-init: unable to get buffersize: %s\n", snd_strerror(err));
|
|
return(0);
|
|
}
|
|
else {
|
|
ao_data.buffersize = err;
|
|
if (verbose)
|
|
printf("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)
|
|
{
|
|
printf("alsa-init: unable to get parameters: %s\n",snd_strerror(err));
|
|
return(0);
|
|
}
|
|
|
|
//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, chunk_size)) < 0)
|
|
{
|
|
printf("alsa-init: unable to set avail_min %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);}
|
|
|
|
}//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()
|
|
{
|
|
|
|
if (alsa_handler) {
|
|
int err;
|
|
|
|
if (!ao_noblock) {
|
|
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");
|
|
}
|
|
}
|
|
else {
|
|
printf("alsa-uninit: no handler defined!\n");
|
|
}
|
|
}
|
|
|
|
static void audio_pause()
|
|
{
|
|
int err;
|
|
|
|
if (!ao_noblock) {
|
|
//drain causes error in nonblock-mode!
|
|
if ((err = snd_pcm_drain(alsa_handler)) < 0)
|
|
{
|
|
printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err));
|
|
return;
|
|
}
|
|
}
|
|
else {
|
|
if (verbose)
|
|
printf("alsa-pause: paused nonblock\n");
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
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 (!ao_noblock) {
|
|
//drain causes error in nonblock-mode!
|
|
if ((err = snd_pcm_drain(alsa_handler)) < 0)
|
|
{
|
|
printf("alsa-pause: 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;
|
|
}
|
|
} else {
|
|
if (verbose)
|
|
printf("alsa-reset: reset nonblocked");
|
|
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
|
|
|
|
/* 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) {
|
|
printf("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);
|
|
printf("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) {
|
|
printf("xrun: prepare error: %s", snd_strerror(err));
|
|
return(0);
|
|
}
|
|
|
|
return(1); /* ok, data should be accepted again */
|
|
}
|
|
|
|
/*
|
|
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(void* data, int len, int flags)
|
|
{
|
|
|
|
//ao_data.bps is always 4 cause its set to channels * 2 by alsa_format??
|
|
int num_frames = len / ao_data.bps;
|
|
signed short *output_samples=data;
|
|
snd_pcm_sframes_t res = 0;
|
|
|
|
//printf("alsa-play: frames=%i, len=%i",num_frames,len);
|
|
|
|
if (!alsa_handler) {
|
|
printf("alsa-play: device configuration error");
|
|
return 0;
|
|
}
|
|
|
|
while (num_frames > 0) {
|
|
|
|
if (ao_mmap) {
|
|
res = snd_pcm_mmap_writei(alsa_handler, (void *)output_samples, num_frames);
|
|
} else {
|
|
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) {
|
|
printf("alsa-play: xrun reset error");
|
|
return(0);
|
|
}
|
|
}
|
|
else if (res == -ESTRPIPE) { /* suspend */
|
|
printf("alsa-play: pcm in suspend mode. trying to resume\n");
|
|
while ((res = snd_pcm_resume(alsa_handler)) == -EAGAIN)
|
|
sleep(1);
|
|
}
|
|
else if (res < 0) {
|
|
printf("alsa-play: unknown status, trying to reset soundcard\n");
|
|
if ((res = snd_pcm_prepare(alsa_handler)) < 0) {
|
|
printf("alsa-play: snd prepare error");
|
|
return(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (res > 0) {
|
|
output_samples += ao_data.channels * res;
|
|
num_frames -= res;
|
|
}
|
|
|
|
} //end while
|
|
|
|
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;
|
|
char *str_status;
|
|
|
|
//snd_pcm_sframes_t avail_frames = 0;
|
|
|
|
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:
|
|
str_status = "open";
|
|
case SND_PCM_STATE_PREPARED:
|
|
if (str_status != "open")
|
|
str_status = "prepared";
|
|
case SND_PCM_STATE_RUNNING:
|
|
ret = snd_pcm_status_get_avail(status) * ao_data.bps;
|
|
//avail_frames = snd_pcm_avail_update(alsa_handler) * ao_data.bps;
|
|
if (str_status != "open" && str_status != "prepared")
|
|
str_status = "running";
|
|
break;
|
|
case SND_PCM_STATE_PAUSED:
|
|
if (verbose) printf("alsa-space: paused");
|
|
str_status = "paused";
|
|
ret = 0;
|
|
break;
|
|
case SND_PCM_STATE_XRUN:
|
|
xrun("space");
|
|
str_status = "xrun";
|
|
ret = 0;
|
|
break;
|
|
default:
|
|
str_status = "undefined";
|
|
ret = 0;
|
|
}
|
|
|
|
if (verbose && str_status != "running")
|
|
printf("alsa-space: free space = %i, status=%i, %s --\n", ret, status, str_status);
|
|
snd_pcm_status_free(status);
|
|
|
|
if (ret < 0) {
|
|
printf("negative value!!\n");
|
|
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)
|
|
{
|
|
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);
|
|
|
|
} else {
|
|
return(0);
|
|
}
|
|
}
|