--- /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.
+ */
+
+/*
+ * 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 "write.h"
+
+#include <alsa/asoundlib.h>
+
+#include "write.cmdline.h"
+#include "error.h"
+
+extern struct gengetopt_args_info conf;
+
+#define FORMAT SND_PCM_FORMAT_S16_LE
+struct private_alsa_data {
+ snd_pcm_t *handle;
+ size_t bytes_per_frame;
+};
+
+/*
+ * 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;
+ unsigned buffer_time = 0;
+ int err;
+ snd_pcm_info_t *info;
+ snd_output_t *log;
+ snd_pcm_uframes_t period_size;
+ struct private_alsa_data *pad = para_malloc(sizeof(struct private_alsa_data));
+ w->private_data = pad;
+
+ snd_pcm_info_alloca(&info);
+ if (snd_output_stdio_attach(&log, stderr, 0) < 0)
+ return -E_ALSA_LOG;
+ err = snd_pcm_open(&pad->handle, conf.device_arg,
+ SND_PCM_STREAM_PLAYBACK, 0);
+ 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,
+ conf.channels_arg) < 0)
+ return -E_CHANNEL_COUNT;
+ if (snd_pcm_hw_params_set_rate_near(pad->handle, hwparams,
+ (unsigned int*) &conf.sample_rate_arg, 0) < 0)
+ return -E_SET_RATE;
+ err = snd_pcm_hw_params_get_buffer_time_max(hwparams, &buffer_time, 0);
+ if (err < 0 || !buffer_time)
+ return -E_GET_BUFFER_TIME;
+ PARA_DEBUG_LOG("buffer time: %d\n", buffer_time);
+ if (snd_pcm_hw_params_set_buffer_time_near(pad->handle, hwparams,
+ &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_DEBUG_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)
+ * conf.channels_arg / 8;
+ return period_size * pad->bytes_per_frame;
+}
+
+/**
+ * push out pcm frames
+ * \param data pointer do data to be written
+ * \param nbytes number of bytes (not frames)
+ *
+ * \return Number of bytes written, -E_ALSA_WRITE on errors.
+ */
+static int alsa_write(char *data, size_t nbytes, struct writer_node *wn)
+{
+ struct private_alsa_data *pad = wn->private_data;
+ size_t frames = nbytes / pad->bytes_per_frame;
+ unsigned char *d = data;
+ snd_pcm_sframes_t r, result = 0;
+
+ while (frames > 0) {
+ /* write interleaved frames */
+ r = snd_pcm_writei(pad->handle, d, frames);
+ if (r < 0)
+ PARA_ERROR_LOG("write error: %s\n", snd_strerror(r));
+ if (r == -EAGAIN || (r >= 0 && r < frames))
+ snd_pcm_wait(pad->handle, 1);
+ else if (r == -EPIPE)
+ snd_pcm_prepare(pad->handle);
+ else if (r < 0)
+ return -E_ALSA_WRITE;
+ if (r > 0) {
+ result += r;
+ frames -= r;
+ d += r * pad->bytes_per_frame;
+ }
+ }
+ return result * pad->bytes_per_frame;
+}
+
+static void alsa_close(struct writer_node *wn)
+{
+ struct private_alsa_data *pad = wn->private_data;
+ snd_pcm_drain(pad->handle);
+ snd_pcm_close(pad->handle);
+ snd_config_update_free_global();
+ free(pad);
+}
+
+void alsa_writer_init(struct writer *w)
+{
+ w->open = alsa_open;
+ w->write = alsa_write;
+ w->close = alsa_close;
+ w->shutdown = NULL; /* nothing to do */
+}
projects / paraslash.git / blobdiff