+++ /dev/null
-/*
- * Copyright (C) 2005-2006 Andre Noll <maan@systemlinux.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
- */
-
-/** \file alsa_writer.c paraslash's alsa output plugin */
-
-/*
- * Based in parts on aplay.c from the alsa-utils-1.0.8 package,
- * Copyright (c) by Jaroslav Kysela <perex@suse.cz>, which is
- * based on the vplay program by Michael Beck.
- */
-
-#include "para.h"
-#include "fd.h"
-#include "string.h"
-#include "list.h"
-#include "sched.h"
-#include "write.h"
-
-#include <alsa/asoundlib.h>
-
-#include "alsa_write.cmdline.h"
-#include "error.h"
-
-
-#define FORMAT SND_PCM_FORMAT_S16_LE
-
-/** data specific to the alsa writer */
-struct private_alsa_data {
- /** the alsa handle */
- snd_pcm_t *handle;
- /** determined and set by alsa_open() */
- size_t bytes_per_frame;
- /** don't write anything until this time */
- struct timeval next_chunk;
- /** the return value of snd_pcm_hw_params_get_buffer_time_max() */
- unsigned buffer_time;
- unsigned samplerate;
- unsigned channels;
-};
-
-/*
- * open and prepare the PCM handle for writing
- *
- * Install PCM software and hardware configuration. Exit on errors.
- */
-static int alsa_open(struct writer_node *w)
-{
- snd_pcm_hw_params_t *hwparams;
- snd_pcm_sw_params_t *swparams;
- snd_pcm_uframes_t buffer_size, xfer_align, start_threshold,
- stop_threshold;
- int err;
- snd_pcm_info_t *info;
- snd_pcm_uframes_t period_size;
- struct private_alsa_data *pad = para_calloc(sizeof(struct private_alsa_data));
- struct alsa_write_args_info *conf = w->conf;
- struct writer_node_group *wng = w->wng;
-
- if (!conf->samplerate_given && wng->samplerate)
- pad->samplerate = *wng->samplerate;
- else
- pad->samplerate = conf->samplerate_arg;
- if (!conf->channels_given && wng->channels)
- pad->channels = *wng->channels;
- else
- pad->channels = conf->channels_arg;
- PARA_INFO_LOG("%d channel(s), %dHz\n", pad->channels, pad->samplerate);
- w->private_data = pad;
- snd_pcm_info_alloca(&info);
- err = snd_pcm_open(&pad->handle, conf->device_arg,
- SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK);
- if (err < 0)
- return -E_PCM_OPEN;
- if ((err = snd_pcm_info(pad->handle, info)) < 0)
- return -E_SND_PCM_INFO;
-
- snd_pcm_hw_params_alloca(&hwparams);
- snd_pcm_sw_params_alloca(&swparams);
- if (snd_pcm_hw_params_any(pad->handle, hwparams) < 0)
- return -E_BROKEN_CONF;
- if (snd_pcm_hw_params_set_access(pad->handle, hwparams,
- SND_PCM_ACCESS_RW_INTERLEAVED) < 0)
- return -E_ACCESS_TYPE;
- if (snd_pcm_hw_params_set_format(pad->handle, hwparams, FORMAT) < 0)
- return -E_SAMPLE_FORMAT;
- if (snd_pcm_hw_params_set_channels(pad->handle, hwparams,
- pad->channels) < 0)
- return -E_CHANNEL_COUNT;
- if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
- &pad->samplerate, 0) < 0)
- return -E_SET_RATE;
- err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &pad->buffer_time, 0);
- if (err < 0 || !pad->buffer_time)
- return -E_GET_BUFFER_TIME;
- PARA_INFO_LOG("buffer time: %d\n", pad->buffer_time);
- if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
- &pad->buffer_time, 0) < 0)
- return -E_SET_BUFFER_TIME;
- if (snd_pcm_hw_params(pad->handle, hwparams) < 0)
- return -E_HW_PARAMS;
- snd_pcm_hw_params_get_period_size(hwparams, &period_size, 0);
- snd_pcm_hw_params_get_buffer_size(hwparams, &buffer_size);
- PARA_INFO_LOG("buffer size: %lu, period_size: %lu\n", buffer_size,
- period_size);
- if (period_size == buffer_size)
- return -E_BAD_PERIOD;
- snd_pcm_sw_params_current(pad->handle, swparams);
- err = snd_pcm_sw_params_get_xfer_align(swparams, &xfer_align);
- if (err < 0 || !xfer_align)
- return -E_GET_XFER;
- snd_pcm_sw_params_set_avail_min(pad->handle, swparams, period_size);
- /* round to closest transfer boundary */
- start_threshold = (buffer_size / xfer_align) * xfer_align;
- if (start_threshold < 1)
- start_threshold = 1;
- if (snd_pcm_sw_params_set_start_threshold(pad->handle, swparams,
- start_threshold) < 0)
- return -E_START_THRESHOLD;
- stop_threshold = buffer_size;
- if (snd_pcm_sw_params_set_stop_threshold(pad->handle, swparams,
- stop_threshold) < 0)
- return -E_STOP_THRESHOLD;
- if (snd_pcm_sw_params_set_xfer_align(pad->handle, swparams,
- xfer_align) < 0)
- return -E_SET_XFER;
- if (snd_pcm_sw_params(pad->handle, swparams) < 0)
- return -E_SW_PARAMS;
- pad->bytes_per_frame = snd_pcm_format_physical_width(FORMAT)
- * pad->channels / 8;
- if (snd_pcm_nonblock(pad->handle, 1))
- PARA_ERROR_LOG("%s\n", "failed to set nonblock mode");
- return period_size * pad->bytes_per_frame;
-}
-
-static int alsa_write_pre_select(struct sched *s, struct writer_node *wn)
-{
- struct private_alsa_data *pad = wn->private_data;
- struct writer_node_group *wng = wn->wng;
- struct timeval diff;
-
- if (*wng->loaded < pad->bytes_per_frame)
- return 1;
- if (tv_diff(now, &pad->next_chunk, &diff) < 0) {
- if (tv_diff(&s->timeout, &diff, NULL) > 0)
- s->timeout = diff;
- } else {
- s->timeout.tv_sec = 0;
- s->timeout.tv_usec = 1;
- }
- return 1;
-// PARA_INFO_LOG("timeout: %lu\n", tv2ms(&s->timeout));
-}
-
-static int alsa_write_post_select(__a_unused struct sched *s,
- struct writer_node *wn)
-{
- struct private_alsa_data *pad = wn->private_data;
- struct writer_node_group *wng = wn->wng;
- size_t frames = (*wng->loaded - wn->written) / pad->bytes_per_frame;
- snd_pcm_sframes_t ret;
- unsigned char *data = (unsigned char*)wng->buf + wn->written;
- struct timeval tv;
-
-// PARA_INFO_LOG("%zd frames\n", frames);
- if (!frames) {
- if (*wng->input_eof)
- wn->written = *wng->loaded;
- return 1;
- }
- if (tv_diff(now, &pad->next_chunk, NULL) < 0)
- return 1;
- ret = snd_pcm_writei(pad->handle, data, frames);
- if (ret == -EPIPE) {
- PARA_WARNING_LOG("%s", "EPIPE\n");
- snd_pcm_prepare(pad->handle);
- return 1;
- }
- if (ret < 0) {
- PARA_WARNING_LOG("%s", "ALSA ERROR\n");
- return -E_ALSA_WRITE;
- }
- ms2tv(pad->buffer_time / 4000, &tv);
-// ms2tv(1, &tv);
- tv_add(now, &tv, &pad->next_chunk);
- wn->written += ret * pad->bytes_per_frame;
- return 1;
-}
-
-static void alsa_close(struct writer_node *wn)
-{
- struct private_alsa_data *pad = wn->private_data;
- PARA_INFO_LOG("closing writer node %p\n", wn);
- snd_pcm_drain(pad->handle);
- snd_pcm_close(pad->handle);
- snd_config_update_free_global();
- free(pad);
-}
-
-__malloc void *alsa_parse_config(char *options)
-{
- struct alsa_write_args_info *conf
- = para_calloc(sizeof(struct alsa_write_args_info));
- PARA_INFO_LOG("options: %s, %d\n", options, strcspn(options, " \t"));
- int ret = alsa_cmdline_parser_string(options, conf, "alsa_write");
- if (ret)
- goto err_out;
- PARA_INFO_LOG("help given: %d\n", conf->help_given);
- return conf;
-err_out:
- free(conf);
- return NULL;
-}
-
-/** the init function of the alsa writer */
-void alsa_writer_init(struct writer *w)
-{
- w->open = alsa_open;
- w->close = alsa_close;
- w->pre_select = alsa_write_pre_select;
- w->post_select = alsa_write_post_select;
- w->parse_config = alsa_parse_config;
- w->shutdown = NULL; /* nothing to do */
-}
projects / paraslash.git / blobdiff