From b5795a70fe81f0b3436b7872b4a3919691bf63f1 Mon Sep 17 00:00:00 2001 From: al3x Date: Thu, 7 Jun 2001 15:43:47 +0000 Subject: [PATCH] first release, meg nem akar menni :( git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@1051 b3059339-0415-0410-9bf9-f77b7e298cf2 --- libao2/ao_alsa1x.c | 474 +++++++++++++++++++++++++++++++++++++++++++++ libao2/ao_alsa9.c | 474 +++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 948 insertions(+) create mode 100644 libao2/ao_alsa1x.c create mode 100644 libao2/ao_alsa9.c diff --git a/libao2/ao_alsa1x.c b/libao2/ao_alsa1x.c new file mode 100644 index 0000000000..71ee42e9be --- /dev/null +++ b/libao2/ao_alsa1x.c @@ -0,0 +1,474 @@ +/* + ao_alsa9 - ALSA-0.9.x output plugin for MPlayer + + (C) Alex Beregszaszi +*/ + +#include +#include /* AFMT_* */ +#include + +#include "../config.h" + +#include "audio_out.h" +#include "audio_out_internal.h" + +extern int verbose; + +static ao_info_t info = +{ + "ALSA-0.9.x audio output", + "alsa9", + "Alex Beregszaszi ", + "under developement" +}; + +LIBAO_EXTERN(alsa9) + +/* global variables: + ao_samplerate + ao_channels + ao_format + ao_bps + ao_outburst + ao_buffersize +*/ + +static snd_pcm_t *alsa_handler; +static snd_pcm_format_t alsa_format; +static snd_pcm_hw_params_t *alsa_hwparams; +static snd_pcm_sw_params_t *alsa_swparams; +static char *alsa_device; +#define ALSA_DEVICE_SIZE 48 + +/* to set/get/query special features/parameters */ +static int control(int cmd, int arg) +{ + switch(cmd) + { + case AOCONTROL_GET_DEVICE: + return(char *)alsa_device; /* egy kicsit brutalis, dehat :) */ + case AOCONTROL_SET_DEVICE: + strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE); + break; + } + return(CONTROL_UNKNOWN); +} + +/* + open & setup audio device + return: 1=success 0=fail +*/ +static int init(int rate_hz, int channels, int format, int flags) +{ + int err; + int cards = -1; + snd_pcm_info_t *alsa_info; + int chunck_size; + + printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz, + channels, audio_out_format_name(format)); + + alsa_handler = NULL; + + if (verbose) + printf("alsa-init: compiled for ALSA-%s (%d)\n", SND_LIB_VERSION_STR, + SND_LIB_VERSION); + + if ((err = snd_card_next(&cards)) < 0 || cards < 0) + { + printf("alsa-init: no soundcards found: %s\n", snd_strerror(err)); + return(0); + } + + ao_format = format; + ao_channels = channels - 1; + ao_samplerate = rate_hz; + ao_bps = ao_samplerate*(ao_channels+1); + ao_outburst = OUTBURST; + ao_buffersize = 16384; + + memset(&alsa_format, 0, sizeof(alsa_format)); + switch (format) + { + case AFMT_S8: + alsa_format = SND_PCM_FORMAT_S8; + break; + case AFMT_U8: + alsa_format = SND_PCM_FORMAT_U8; + break; + case AFMT_U16_LE: + alsa_format = SND_PCM_FORMAT_U16_LE; + break; + case AFMT_U16_BE: + alsa_format = SND_PCM_FORMAT_U16_BE; + break; + case AFMT_S16_LE: + alsa_format = SND_PCM_FORMAT_S16_LE; + break; + case AFMT_S16_BE: + alsa_format = SND_PCM_FORMAT_S16_BE; + break; + default: + alsa_format = SND_PCM_FORMAT_MPEG; + break; + } + + switch(alsa_format) + { + case SND_PCM_FORMAT_S16_LE: + case SND_PCM_FORMAT_U16_LE: + ao_bps *= 2; + break; + case -1: + printf("alsa-init: invalid format (%s) requested - output disabled\n", + audio_out_format_name(format)); + return(0); + } + + if ((err = snd_pcm_info_malloc(&alsa_info)) < 0) + { + printf("alsa-init: memory allocation error: %s\n", snd_strerror(err)); + return(0); + } + + if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL) + { + printf("alsa-init: memory allocation error: %s\n", strerror(errno)); + return(0); + } + + snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d", + snd_pcm_info_get_device(alsa_info), + snd_pcm_info_get_subdevice(alsa_info)); + + snd_pcm_info_free(alsa_info); + + printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1, + (cards >= 0) ? "" : "s", alsa_device); + + if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, + 0)) < 0) + { + printf("alsa-init: playback open error: %s\n", snd_strerror(err)); + return(0); + } + + snd_pcm_hw_params_malloc(&alsa_hwparams); + snd_pcm_sw_params_malloc(&alsa_swparams); + + if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0) + { + printf("alsa-init: unable to get initial parameters: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams, + SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) + { + printf("alsa-init: unable to set access type: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams, + alsa_format)) < 0) + { + printf("alsa-init: unable to set format: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams, + ao_channels)) < 0) + { + printf("alsa-init: unable to set channels: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_rate(alsa_handler, alsa_hwparams, + ao_samplerate, 0)) < 0) + { + printf("alsa-init: unable to set channels: %s\n", + snd_strerror(err)); + return(0); + } + +#ifdef buffersize + if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0) + { + printf("alsa-init: unable to get buffer size: %s\n", + snd_strerror(err)); + return(0); + } else + ao_buffersize = err; +#endif + +#ifdef buffertime + { + int alsa_buffer_time = 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/ao_bps, 0)) < 0) + { + printf("alsa-init: unable to set period time: %s\n", + snd_strerror(err)); + return(0); + } + } +#endif + + if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0) + { + printf("alsa-init: unable to set parameters: %s\n", + snd_strerror(err)); + return(0); + } + + 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); + } + + if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams, + SND_PCM_START_DATA)) < 0) + { + printf("alsa-init: unable to set start mode: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) + { + printf("alsa-init: unable to set parameters: %s\n", + snd_strerror(err)); + return(0); + } + + snd_pcm_sw_params_default(alsa_handler, alsa_swparams); + + if ((err = snd_pcm_prepare(alsa_handler)) < 0) + { + printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); + if (err != -EPIPE) + return(0); + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); + return(0); + } + } + + printf("AUDIO: %d Hz/%d channels/%d bps/%d bytes buffer/%s\n", + ao_samplerate, ao_channels+1, ao_bps, ao_buffersize, + snd_pcm_format_description(alsa_format)); + return(1); +} + +/* close audio device */ +static void uninit() +{ + int err; + + if (alsa_device != NULL) + free(alsa_device); + + snd_pcm_hw_params_free(alsa_hwparams); + snd_pcm_sw_params_free(alsa_swparams); + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-uninit: pcm reset 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; + } +} + +static void audio_pause() +{ + int err; + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err)); + 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; + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-resume: pcm start error: %s\n", snd_strerror(err)); + return; + } +} + +/* stop playing and empty buffers (for seeking/pause) */ +static void reset() +{ + int err; + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-reset: pcm reset 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; + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-reset: pcm start error: %s\n", snd_strerror(err)); + return; + } +} + +/* + plays 'len' bytes of 'data' + returns: number of bytes played +*/ +static int play(void* data, int len, int flags) +{ + if ((len = snd_pcm_writei(alsa_handler, data, len)) != len) + { + if (len == -EPIPE) /* underrun? */ + { + printf("alsa-play: alsa underrun, resetting stream\n"); + if ((len = snd_pcm_prepare(alsa_handler)) < 0) + { + printf("alsa-play: playback prepare error: %s\n", snd_strerror(len)); + return(0); + } + if ((len = snd_pcm_writei(alsa_handler, data, len)) != len) + { + printf("alsa-play: write error after reset: %s - giving up\n", + snd_strerror(len)); + return(0); + } + return(len); /* 2nd write was ok */ + } + printf("alsa-play: output error: %s\n", snd_strerror(len)); + } + return(len); +} + +/* how many byes are free in the buffer */ +static int get_space() +{ + snd_pcm_status_t *status; + int ret; + + if ((ret = snd_pcm_status_malloc(&status)) < 0) + { + printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret)); + return(0); + } + + if ((ret = snd_pcm_status(alsa_handler, status)) < 0) + { + printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret)); + return(0); + } + + switch(snd_pcm_status_get_state(status)) + { + case SND_PCM_STATE_OPEN: + case SND_PCM_STATE_PREPARED: + case SND_PCM_STATE_RUNNING: + ret = snd_pcm_status_get_avail(status) * ao_bps; + break; + default: + ret = 0; + } + + snd_pcm_status_free(status); + return(ret); +} + +/* how many unplayed bytes are in the buffer */ +static int get_delay() +{ + snd_pcm_status_t *status; + int 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 = snd_pcm_status_get_delay(status) * ao_bps; + break; + default: + ret = 0; + } + + snd_pcm_status_free(status); + return(ret); +} diff --git a/libao2/ao_alsa9.c b/libao2/ao_alsa9.c new file mode 100644 index 0000000000..71ee42e9be --- /dev/null +++ b/libao2/ao_alsa9.c @@ -0,0 +1,474 @@ +/* + ao_alsa9 - ALSA-0.9.x output plugin for MPlayer + + (C) Alex Beregszaszi +*/ + +#include +#include /* AFMT_* */ +#include + +#include "../config.h" + +#include "audio_out.h" +#include "audio_out_internal.h" + +extern int verbose; + +static ao_info_t info = +{ + "ALSA-0.9.x audio output", + "alsa9", + "Alex Beregszaszi ", + "under developement" +}; + +LIBAO_EXTERN(alsa9) + +/* global variables: + ao_samplerate + ao_channels + ao_format + ao_bps + ao_outburst + ao_buffersize +*/ + +static snd_pcm_t *alsa_handler; +static snd_pcm_format_t alsa_format; +static snd_pcm_hw_params_t *alsa_hwparams; +static snd_pcm_sw_params_t *alsa_swparams; +static char *alsa_device; +#define ALSA_DEVICE_SIZE 48 + +/* to set/get/query special features/parameters */ +static int control(int cmd, int arg) +{ + switch(cmd) + { + case AOCONTROL_GET_DEVICE: + return(char *)alsa_device; /* egy kicsit brutalis, dehat :) */ + case AOCONTROL_SET_DEVICE: + strncpy(alsa_device, (char *)arg, ALSA_DEVICE_SIZE); + break; + } + return(CONTROL_UNKNOWN); +} + +/* + open & setup audio device + return: 1=success 0=fail +*/ +static int init(int rate_hz, int channels, int format, int flags) +{ + int err; + int cards = -1; + snd_pcm_info_t *alsa_info; + int chunck_size; + + printf("alsa-init: requested format: %d Hz, %d channels, %s\n", rate_hz, + channels, audio_out_format_name(format)); + + alsa_handler = NULL; + + if (verbose) + printf("alsa-init: compiled for ALSA-%s (%d)\n", SND_LIB_VERSION_STR, + SND_LIB_VERSION); + + if ((err = snd_card_next(&cards)) < 0 || cards < 0) + { + printf("alsa-init: no soundcards found: %s\n", snd_strerror(err)); + return(0); + } + + ao_format = format; + ao_channels = channels - 1; + ao_samplerate = rate_hz; + ao_bps = ao_samplerate*(ao_channels+1); + ao_outburst = OUTBURST; + ao_buffersize = 16384; + + memset(&alsa_format, 0, sizeof(alsa_format)); + switch (format) + { + case AFMT_S8: + alsa_format = SND_PCM_FORMAT_S8; + break; + case AFMT_U8: + alsa_format = SND_PCM_FORMAT_U8; + break; + case AFMT_U16_LE: + alsa_format = SND_PCM_FORMAT_U16_LE; + break; + case AFMT_U16_BE: + alsa_format = SND_PCM_FORMAT_U16_BE; + break; + case AFMT_S16_LE: + alsa_format = SND_PCM_FORMAT_S16_LE; + break; + case AFMT_S16_BE: + alsa_format = SND_PCM_FORMAT_S16_BE; + break; + default: + alsa_format = SND_PCM_FORMAT_MPEG; + break; + } + + switch(alsa_format) + { + case SND_PCM_FORMAT_S16_LE: + case SND_PCM_FORMAT_U16_LE: + ao_bps *= 2; + break; + case -1: + printf("alsa-init: invalid format (%s) requested - output disabled\n", + audio_out_format_name(format)); + return(0); + } + + if ((err = snd_pcm_info_malloc(&alsa_info)) < 0) + { + printf("alsa-init: memory allocation error: %s\n", snd_strerror(err)); + return(0); + } + + if ((alsa_device = malloc(ALSA_DEVICE_SIZE)) == NULL) + { + printf("alsa-init: memory allocation error: %s\n", strerror(errno)); + return(0); + } + + snprintf(alsa_device, ALSA_DEVICE_SIZE, "hw:%d,%d", + snd_pcm_info_get_device(alsa_info), + snd_pcm_info_get_subdevice(alsa_info)); + + snd_pcm_info_free(alsa_info); + + printf("alsa-init: %d soundcard%s found, using: %s\n", cards+1, + (cards >= 0) ? "" : "s", alsa_device); + + if ((err = snd_pcm_open(&alsa_handler, alsa_device, SND_PCM_STREAM_PLAYBACK, + 0)) < 0) + { + printf("alsa-init: playback open error: %s\n", snd_strerror(err)); + return(0); + } + + snd_pcm_hw_params_malloc(&alsa_hwparams); + snd_pcm_sw_params_malloc(&alsa_swparams); + + if ((err = snd_pcm_hw_params_any(alsa_handler, alsa_hwparams)) < 0) + { + printf("alsa-init: unable to get initial parameters: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_access(alsa_handler, alsa_hwparams, + SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) + { + printf("alsa-init: unable to set access type: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_format(alsa_handler, alsa_hwparams, + alsa_format)) < 0) + { + printf("alsa-init: unable to set format: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_channels(alsa_handler, alsa_hwparams, + ao_channels)) < 0) + { + printf("alsa-init: unable to set channels: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_hw_params_set_rate(alsa_handler, alsa_hwparams, + ao_samplerate, 0)) < 0) + { + printf("alsa-init: unable to set channels: %s\n", + snd_strerror(err)); + return(0); + } + +#ifdef buffersize + if ((err = snd_pcm_hw_params_get_buffer_size(alsa_hwparams)) < 0) + { + printf("alsa-init: unable to get buffer size: %s\n", + snd_strerror(err)); + return(0); + } else + ao_buffersize = err; +#endif + +#ifdef buffertime + { + int alsa_buffer_time = 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/ao_bps, 0)) < 0) + { + printf("alsa-init: unable to set period time: %s\n", + snd_strerror(err)); + return(0); + } + } +#endif + + if ((err = snd_pcm_hw_params(alsa_handler, alsa_hwparams)) < 0) + { + printf("alsa-init: unable to set parameters: %s\n", + snd_strerror(err)); + return(0); + } + + 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); + } + + if ((err = snd_pcm_sw_params_set_start_mode(alsa_handler, alsa_swparams, + SND_PCM_START_DATA)) < 0) + { + printf("alsa-init: unable to set start mode: %s\n", + snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_sw_params(alsa_handler, alsa_swparams)) < 0) + { + printf("alsa-init: unable to set parameters: %s\n", + snd_strerror(err)); + return(0); + } + + snd_pcm_sw_params_default(alsa_handler, alsa_swparams); + + if ((err = snd_pcm_prepare(alsa_handler)) < 0) + { + printf("alsa-init: pcm prepare error: %s\n", snd_strerror(err)); + return(0); + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); + if (err != -EPIPE) + return(0); + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-init: pcm start error: %s\n", snd_strerror(err)); + return(0); + } + } + + printf("AUDIO: %d Hz/%d channels/%d bps/%d bytes buffer/%s\n", + ao_samplerate, ao_channels+1, ao_bps, ao_buffersize, + snd_pcm_format_description(alsa_format)); + return(1); +} + +/* close audio device */ +static void uninit() +{ + int err; + + if (alsa_device != NULL) + free(alsa_device); + + snd_pcm_hw_params_free(alsa_hwparams); + snd_pcm_sw_params_free(alsa_swparams); + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-uninit: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-uninit: pcm reset 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; + } +} + +static void audio_pause() +{ + int err; + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-pause: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-pause: pcm reset error: %s\n", snd_strerror(err)); + 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; + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-resume: pcm start error: %s\n", snd_strerror(err)); + return; + } +} + +/* stop playing and empty buffers (for seeking/pause) */ +static void reset() +{ + int err; + + if ((err = snd_pcm_drain(alsa_handler)) < 0) + { + printf("alsa-reset: pcm drain error: %s\n", snd_strerror(err)); + return; + } + + if ((err = snd_pcm_reset(alsa_handler)) < 0) + { + printf("alsa-reset: pcm reset 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; + } + + if ((err = snd_pcm_start(alsa_handler)) < 0) + { + printf("alsa-reset: pcm start error: %s\n", snd_strerror(err)); + return; + } +} + +/* + plays 'len' bytes of 'data' + returns: number of bytes played +*/ +static int play(void* data, int len, int flags) +{ + if ((len = snd_pcm_writei(alsa_handler, data, len)) != len) + { + if (len == -EPIPE) /* underrun? */ + { + printf("alsa-play: alsa underrun, resetting stream\n"); + if ((len = snd_pcm_prepare(alsa_handler)) < 0) + { + printf("alsa-play: playback prepare error: %s\n", snd_strerror(len)); + return(0); + } + if ((len = snd_pcm_writei(alsa_handler, data, len)) != len) + { + printf("alsa-play: write error after reset: %s - giving up\n", + snd_strerror(len)); + return(0); + } + return(len); /* 2nd write was ok */ + } + printf("alsa-play: output error: %s\n", snd_strerror(len)); + } + return(len); +} + +/* how many byes are free in the buffer */ +static int get_space() +{ + snd_pcm_status_t *status; + int ret; + + if ((ret = snd_pcm_status_malloc(&status)) < 0) + { + printf("alsa-space: memory allocation error: %s\n", snd_strerror(ret)); + return(0); + } + + if ((ret = snd_pcm_status(alsa_handler, status)) < 0) + { + printf("alsa-space: cannot get pcm status: %s\n", snd_strerror(ret)); + return(0); + } + + switch(snd_pcm_status_get_state(status)) + { + case SND_PCM_STATE_OPEN: + case SND_PCM_STATE_PREPARED: + case SND_PCM_STATE_RUNNING: + ret = snd_pcm_status_get_avail(status) * ao_bps; + break; + default: + ret = 0; + } + + snd_pcm_status_free(status); + return(ret); +} + +/* how many unplayed bytes are in the buffer */ +static int get_delay() +{ + snd_pcm_status_t *status; + int 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 = snd_pcm_status_get_delay(status) * ao_bps; + break; + default: + ret = 0; + } + + snd_pcm_status_free(status); + return(ret); +}