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/* Process Queue: ALSA PCM output */
/* (C) 2017 by Harald Welte <laforge@gnumonks.org> */
/*
* This file is part of gapk (GSM Audio Pocket Knife).
*
* gapk 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 3 of the License, or
* (at your option) any later version.
*
* gapk 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 gapk. If not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <gapk/codecs.h>
#include <gapk/formats.h>
#include <gapk/procqueue.h>
#include "config.h"
#ifdef HAVE_ALSA
#include <alsa/asoundlib.h>
struct pq_state_alsa {
snd_pcm_t *pcm_handle;
unsigned int blk_len;
};
static int
pq_cb_alsa_input(void *_state, uint8_t *out, const uint8_t *in)
{
struct pq_state_alsa *state = _state;
unsigned int num_samples = state->blk_len/2;
int rv;
rv = snd_pcm_readi(state->pcm_handle, out, num_samples);
return rv == num_samples ? 0 : -1;
}
static int
pq_cb_alsa_output(void *_state, uint8_t *out, const uint8_t *in)
{
struct pq_state_alsa *state = _state;
unsigned int num_samples = state->blk_len/2;
int rv;
rv = snd_pcm_writei(state->pcm_handle, in, num_samples);
return rv == num_samples ? 0 : -1;
}
static void
pq_cb_alsa_exit(void *_state)
{
struct pq_state_alsa *state = _state;
snd_pcm_close(state->pcm_handle);
}
static int
pq_queue_alsa_op(struct pq *pq, const char *alsa_dev, unsigned int blk_len, int in_out_n)
{
struct pq_item *item;
struct pq_state_alsa *state;
snd_pcm_hw_params_t *hw_params;
int rc = -1;
state = calloc(1, sizeof(struct pq_state_alsa));
if (!state)
return -ENOMEM;
rc = snd_pcm_open(&state->pcm_handle, alsa_dev,
in_out_n ? SND_PCM_STREAM_CAPTURE : SND_PCM_STREAM_PLAYBACK, 0);
if (rc < 0)
return rc;
state->blk_len = blk_len;
rc = snd_pcm_hw_params_malloc(&hw_params);
if (rc < 0)
goto out_close;
rc = snd_pcm_hw_params_any(state->pcm_handle, hw_params);
if (rc < 0)
goto out_free_par;
rc = snd_pcm_hw_params_set_access(state->pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED);
if (rc < 0)
goto out_free_par;
rc = snd_pcm_hw_params_set_format(state->pcm_handle, hw_params, SND_PCM_FORMAT_S16_LE);
if (rc < 0)
goto out_free_par;
rc = snd_pcm_hw_params_set_rate(state->pcm_handle, hw_params, 8000, 0);
if (rc < 0)
goto out_free_par;
rc = snd_pcm_hw_params_set_channels (state->pcm_handle, hw_params, 1);
if (rc < 0)
goto out_free_par;
rc = snd_pcm_hw_params(state->pcm_handle, hw_params);
if (rc < 0)
goto out_free_par;
snd_pcm_hw_params_free(hw_params);
item = pq_add_item(pq);
if (!item) {
rc = -ENOMEM;
goto out_close;
}
item->len_in = in_out_n ? 0 : blk_len;
item->len_out = in_out_n ? blk_len : 0;
item->state = state;
item->proc = in_out_n ? pq_cb_alsa_input : pq_cb_alsa_output;
item->exit = pq_cb_alsa_exit;
return 0;
out_free_par:
snd_pcm_hw_params_free(hw_params);
out_close:
snd_pcm_close(state->pcm_handle);
free(state);
return rc;
}
/*! Add ALSA input to given processing queue
* This usually only makes sense as first item in the queue
* \param pq Processing Queue to add the ALSA input to
* \param[in] hwdev ALSA hardware device to use
* \param[in] blk_len block length to be read from device
* \returns 0 on sucess; negative on error */
int
pq_queue_alsa_input(struct pq *pq, const char *hwdev, unsigned int blk_len)
{
return pq_queue_alsa_op(pq, hwdev, blk_len, 1);
}
/*! Add ALSA output to given processing queue
* This usually only makes sense as first item in the queue
* \param pq Processing Queue to add the ALSA output to
* \param[in] hwdev ALSA hardware device to use
* \param[in] blk_len block length to be written to device
* \returns 0 on sucess; negative on error */
int
pq_queue_alsa_output(struct pq *pq, const char *hwdev, unsigned int blk_len)
{
return pq_queue_alsa_op(pq, hwdev, blk_len, 0);
}
#endif /* HAVE_ALSA */
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