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seeed-voicecard/ac108_plugin/pcm_ac108.c
Baozhu Zuo 5baa9289cf ac108_plugin version 1: only support channel=4
2017-09-18 09:40:50 +08:00

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//https://github.com/HazouPH/android_device_motorola_smi-plus/blob/48029b4afc307c73181b108a5b0155b9f20856ca/smi-modules/alsa-lib_module_voice/pcm_voice.c
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <alsa/asoundlib.h>
#include <alsa/pcm_external.h>
#include <alsa/pcm_plugin.h>
#include <math.h>
#define ARRAY_SIZE(ary) (sizeof(ary)/sizeof(ary[0]))
#define AC108_FRAME_SIZE 4096
struct ac108_t {
snd_pcm_ioplug_t io;
snd_pcm_t *slave;
snd_pcm_hw_params_t *hw_params;
unsigned int last_size;
unsigned int ptr;
void *buf;
unsigned int latency; // Delay in usec
unsigned int bufferSize; // Size of sample buffer
};
/* set up the fixed parameters of slave PCM hw_parmas */
static int ac108_slave_hw_params_half(struct ac108_t *rec, unsigned int rate,snd_pcm_format_t format) {
int err;
snd_pcm_uframes_t bufferSize = rec->bufferSize;
unsigned int latency = rec->latency;
unsigned int buffer_time = 0;
unsigned int period_time = 0;
if ((err = snd_pcm_hw_params_malloc(&rec->hw_params)) < 0) return err;
if ((err = snd_pcm_hw_params_any(rec->slave, rec->hw_params)) < 0) {
SNDERR("Cannot get slave hw_params");
goto out;
}
if ((err = snd_pcm_hw_params_set_access(rec->slave, rec->hw_params,
SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
SNDERR("Cannot set slave access RW_INTERLEAVED");
goto out;
}
if ((err = snd_pcm_hw_params_set_channels(rec->slave, rec->hw_params, 2)) < 0) {
SNDERR("Cannot set slave channels 2");
goto out;
}
if ((err = snd_pcm_hw_params_set_format(rec->slave, rec->hw_params,
format)) < 0) {
SNDERR("Cannot set slave format");
goto out;
}
if ((err = snd_pcm_hw_params_set_rate(rec->slave, rec->hw_params, rate, 0)) < 0) {
SNDERR("Cannot set slave rate %d", rate);
goto out;
}
err = snd_pcm_hw_params_get_buffer_time_max(rec->hw_params,
&buffer_time, 0);
if (buffer_time > 80000)
buffer_time = 80000;
period_time = buffer_time / 4;
err = snd_pcm_hw_params_set_period_time_near(rec->slave, rec->hw_params,
&period_time, 0);
if (err < 0) {
fprintf(stderr,"Unable to set_period_time_near");
goto out;
}
err = snd_pcm_hw_params_set_buffer_time_near(rec->slave, rec->hw_params,
&buffer_time, 0);
if (err < 0) {
fprintf(stderr,"Unable to set_buffer_time_near");
goto out;
}
rec->bufferSize = bufferSize;
rec->latency = latency;
return 0;
out:
free(rec->hw_params);
rec->hw_params = NULL;
return err;
}
/*
* start and stop callbacks - just trigger slave PCM
*/
static int ac108_start(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
if(!rec->slave) {
fprintf(stderr, "slave is lost\n");
}
return snd_pcm_start(rec->slave);
}
static int ac108_stop(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
return snd_pcm_drop(rec->slave);
}
/*
* pointer callback
*
* Calculate the current position from the delay of slave PCM
*/
static snd_pcm_sframes_t ac108_pointer(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
int err, size;
assert(rec);
size = snd_pcm_avail(rec->slave);
if (size < 0) return size;
size = size /2;
if (size > rec->last_size) {
rec->ptr += size - rec->last_size;
rec->ptr %= io->buffer_size;
}
rec->last_size = size;
//fprintf(stderr, "%s :%d %d %d %d\n", __func__, rec->ptr,size, io->appl_ptr, io->hw_ptr);
return rec->ptr;
}
/*
* transfer callback
*/
static snd_pcm_sframes_t ac108_transfer(snd_pcm_ioplug_t *io,
const snd_pcm_channel_area_t *areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t size) {
struct ac108_t *rec = io->private_data;
char *buf;
ssize_t result;
int err;
/* we handle only an interleaved buffer */
buf = (char *)areas->addr + (areas->first + areas->step * offset) / 8;
result = snd_pcm_readi(rec->slave, buf, size*2);
if (result <= 0) {
fprintf(stderr, "%s out error:%d %d\n", __func__, result);
return result;
}
rec->last_size -= size;
return size;
}
/*
* poll-related callbacks - just pass to slave PCM
*/
static int ac108_poll_descriptors_count(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
//fprintf(stderr, "%s\n", __FUNCTION__);
return snd_pcm_poll_descriptors_count(rec->slave);
}
static int ac108_poll_descriptors(snd_pcm_ioplug_t *io, struct pollfd *pfd,
unsigned int space) {
struct ac108_t *rec = io->private_data;
//fprintf(stderr, "%s\n", __FUNCTION__);
return snd_pcm_poll_descriptors(rec->slave, pfd, space);
}
static int ac108_poll_revents(snd_pcm_ioplug_t *io, struct pollfd *pfd,
unsigned int nfds, unsigned short *revents) {
struct ac108_t *rec = io->private_data;
//fprintf(stderr, "%s\n", __FUNCTION__);
return snd_pcm_poll_descriptors_revents(rec->slave, pfd, nfds, revents);
}
/*
* close callback
*/
static int ac108_close(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
if (rec->slave) return snd_pcm_close(rec->slave);
return 0;
}
static int setSoftwareParams(struct ac108_t *rec) {
snd_pcm_sw_params_t *softwareParams;
int err;
snd_pcm_uframes_t bufferSize = 0;
snd_pcm_uframes_t periodSize = 0;
snd_pcm_uframes_t startThreshold, stopThreshold;
snd_pcm_sw_params_alloca(&softwareParams);
// Get the current software parameters
err = snd_pcm_sw_params_current(rec->slave, softwareParams);
if (err < 0) {
fprintf(stderr, "Unable to get software parameters: %s", snd_strerror(err));
goto done;
}
// Configure ALSA to start the transfer when the buffer is almost full.
snd_pcm_get_params(rec->slave, &bufferSize, &periodSize);
startThreshold = 1;
stopThreshold = bufferSize;
err = snd_pcm_sw_params_set_start_threshold(rec->slave, softwareParams,
startThreshold);
if (err < 0) {
fprintf(stderr, "Unable to set start threshold to %lu frames: %s",
startThreshold, snd_strerror(err));
goto done;
}
err = snd_pcm_sw_params_set_stop_threshold(rec->slave, softwareParams,
stopThreshold);
if (err < 0) {
fprintf(stderr, "Unable to set stop threshold to %lu frames: %s",
stopThreshold, snd_strerror(err));
goto done;
}
// Allow the transfer to start when at least periodSize samples can be
// processed.
err = snd_pcm_sw_params_set_avail_min(rec->slave, softwareParams,
periodSize);
if (err < 0) {
fprintf(stderr, "Unable to configure available minimum to %lu: %s",
periodSize, snd_strerror(err));
goto done;
}
// Commit the software parameters back to the device.
err = snd_pcm_sw_params(rec->slave, softwareParams);
if (err < 0) fprintf(stderr, "Unable to configure software parameters: %s",
snd_strerror(err));
return 0;
done:
snd_pcm_sw_params_free(softwareParams);
return err;
}
/*
* hw_params callback
*
* Set up slave PCM according to the current parameters
*/
//static int ac108_hw_params(snd_pcm_ioplug_t *io,
// snd_pcm_hw_params_t *params ATTRIBUTE_UNUSED) {
static int ac108_hw_params(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
snd_pcm_sw_params_t *sparams;
snd_pcm_uframes_t period_size;
snd_pcm_uframes_t buffer_size;
int err;
if (!rec->hw_params) {
err = ac108_slave_hw_params_half(rec, 2*io->rate,io->format);
if (err < 0) {
fprintf(stderr, "ac108_slave_hw_params_half error\n");
return err;
}
}
period_size = io->period_size;
if ((err = snd_pcm_hw_params_set_period_size_near(rec->slave, rec->hw_params,
&period_size, NULL)) < 0) {
SNDERR("Cannot set slave period size %ld", period_size);
return err;
}
buffer_size = io->buffer_size;
if ((err = snd_pcm_hw_params_set_buffer_size_near(rec->slave, rec->hw_params,
&buffer_size)) < 0) {
SNDERR("Cannot set slave buffer size %ld", buffer_size);
return err;
}
if ((err = snd_pcm_hw_params(rec->slave, rec->hw_params)) < 0) {
SNDERR("Cannot set slave hw_params");
return err;
}
setSoftwareParams(rec);
return 0;
}
/*
* hw_free callback
*/
static int ac108_hw_free(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
free(rec->hw_params);
if (rec->buf != NULL) {
free(rec->buf);
rec->buf = NULL;
}
rec->hw_params = NULL;
return snd_pcm_hw_free(rec->slave);
}
static int ac108_prepare(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
rec->ptr = 0;
rec->last_size =0;
if (rec->buf == NULL) {
rec->buf = malloc(io->buffer_size);
}
return snd_pcm_prepare(rec->slave);
}
static int ac108_drain(snd_pcm_ioplug_t *io) {
struct ac108_t *rec = io->private_data;
return snd_pcm_drain(rec->slave);
}
static int ac108_sw_params(snd_pcm_ioplug_t *io, snd_pcm_sw_params_t *params) {
struct ac108_t *rec = io->private_data;
return 0;
}
static int ac108_delay(snd_pcm_ioplug_t * io, snd_pcm_sframes_t * delayp){
return 0;
}
/*
* callback table
*/
static snd_pcm_ioplug_callback_t a108_ops = {
.start = ac108_start,
.stop = ac108_stop,
.pointer = ac108_pointer,
.transfer = ac108_transfer,
.poll_descriptors_count = ac108_poll_descriptors_count,
.poll_descriptors = ac108_poll_descriptors,
.poll_revents = ac108_poll_revents,
.close = ac108_close,
.hw_params = ac108_hw_params,
.hw_free = ac108_hw_free,
// .sw_params = ac108_sw_params,
.prepare = ac108_prepare,
.drain = ac108_drain,
.delay = ac108_delay,
};
static int ac108_set_hw_constraint(struct ac108_t *rec) {
static unsigned int accesses[] = {
SND_PCM_ACCESS_RW_INTERLEAVED,
SND_PCM_ACCESS_RW_NONINTERLEAVED
};
unsigned int formats[] = { SND_PCM_FORMAT_S32,
SND_PCM_FORMAT_S16 };
unsigned int rates[] = {
8000,
16000,
48000
};
int err;
snd_pcm_uframes_t buffer_max;
unsigned int period_bytes, max_periods;
err = snd_pcm_ioplug_set_param_list(&rec->io,
SND_PCM_IOPLUG_HW_ACCESS,
ARRAY_SIZE(accesses),
accesses);
if (err < 0) return err;
if ((err = snd_pcm_ioplug_set_param_list(&rec->io, SND_PCM_IOPLUG_HW_FORMAT,
ARRAY_SIZE(formats), formats)) < 0 ||
(err = snd_pcm_ioplug_set_param_minmax(&rec->io, SND_PCM_IOPLUG_HW_CHANNELS,
4, 4)) < 0 ||
(err = snd_pcm_ioplug_set_param_list(&rec->io, SND_PCM_IOPLUG_HW_RATE,
ARRAY_SIZE(rates), rates)) < 0) return err;
err = snd_pcm_ioplug_set_param_minmax(&rec->io,
SND_PCM_IOPLUG_HW_BUFFER_BYTES,
1, 4 * 1024 * 1024);
if (err < 0) return err;
err = snd_pcm_ioplug_set_param_minmax(&rec->io,
SND_PCM_IOPLUG_HW_PERIOD_BYTES,
128, 2 * 1024 * 1024);
if (err < 0) return err;
err = snd_pcm_ioplug_set_param_minmax(&rec->io, SND_PCM_IOPLUG_HW_PERIODS,
3, 1024);
return 0;
}
/*
/*
* Main entry point
*/
SND_PCM_PLUGIN_DEFINE_FUNC(ac108) {
snd_config_iterator_t i, next;
int err;
const char *card = NULL;
const char *pcm_string = NULL;
snd_pcm_format_t format = SND_PCM_FORMAT_S32_LE;
char devstr[128], tmpcard[8];
struct ac108_t *rec;
int channels;
struct pollfd fds;
if (stream != SND_PCM_STREAM_CAPTURE) {
SNDERR("a108 is only for capture");
return -EINVAL;
}
snd_config_for_each(i, next, conf) {
snd_config_t *n = snd_config_iterator_entry(i);
const char *id;
if (snd_config_get_id(n, &id) < 0) continue;
if (strcmp(id, "comment") == 0 || strcmp(id, "type") == 0 || strcmp(id, "hint") == 0) continue;
if (strcmp(id, "slavepcm") == 0) {
if (snd_config_get_string(n, &pcm_string) < 0) {
SNDERR("ac108 slavepcm must be a string");
return -EINVAL;
}
continue;
}
if (strcmp(id, "channels") == 0) {
long val;
if (snd_config_get_integer(n, &val) < 0) {
SNDERR("Invalid type for %s", id);
return -EINVAL;
}
channels = val;
if (channels != 2 && channels != 4 && channels != 6) {
SNDERR("channels must be 2, 4 or 6");
return -EINVAL;
}
continue;
}
}
rec = calloc(1, sizeof(*rec));
if (!rec) {
SNDERR("cannot allocate");
return -ENOMEM;
}
err = snd_pcm_open(&rec->slave, pcm_string, stream, mode);
if (err < 0) goto error;
//SND_PCM_NONBLOCK
rec->io.version = SND_PCM_IOPLUG_VERSION;
rec->io.name = "AC108 decode Plugin";
rec->io.mmap_rw = 0;
rec->io.callback = &a108_ops;
rec->io.private_data = rec;
err = snd_pcm_ioplug_create(&rec->io, name, stream, mode);
if (err < 0) goto error;
if ((err = ac108_set_hw_constraint(rec)) < 0) {
snd_pcm_ioplug_delete(&rec->io);
return err;
}
*pcmp = rec->io.pcm;
return 0;
error:
if (rec->slave) snd_pcm_close(rec->slave);
free(rec);
return err;
}
SND_PCM_PLUGIN_SYMBOL(ac108);
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