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linuxrec.c
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linuxrec.c
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/*
@file
@brief record demo for linux
@author taozhang9
@date 2016/05/27
*/
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <alsa/asoundlib.h>
#include <signal.h>
#include <sys/stat.h>
#include <pthread.h>
#include "formats.h"
#include "linuxrec.h"
#define DBG_ON 1
#if DBG_ON
#define dbg printf
#else
#define dbg
#endif
/* Do not change the sequence */
enum {
RECORD_STATE_CREATED, /* Init */
RECORD_STATE_CLOSING,
RECORD_STATE_READY, /* Opened */
RECORD_STATE_STOPPING, /* During Stop */
RECORD_STATE_RECORDING, /* Started */
};
#define SAMPLE_RATE 16000
#define SAMPLE_BIT_SIZE 16
#define FRAME_CNT 10
//#define BUF_COUNT 1
#define DEF_BUFF_TIME 500000
#define DEF_PERIOD_TIME 100000
#define DEFAULT_FORMAT \
{\
WAVE_FORMAT_PCM, \
1, \
16000, \
32000, \
2, \
16, \
sizeof(WAVEFORMATEX) \
}
#if 0
struct bufinfo {
char *data;
unsigned int bufsize;
};
#endif
static int show_xrun = 1;
static int start_record_internal(snd_pcm_t *pcm)
{
return snd_pcm_start(pcm);
}
static int stop_record_internal(snd_pcm_t *pcm)
{
return snd_pcm_drop(pcm);
}
static int is_stopped_internal(struct recorder *rec)
{
snd_pcm_state_t state;
state = snd_pcm_state((snd_pcm_t *)rec->wavein_hdl);
switch (state) {
case SND_PCM_STATE_RUNNING:
case SND_PCM_STATE_DRAINING:
return 0;
default: break;
}
return 1;
}
static int format_ms_to_alsa(const WAVEFORMATEX * wavfmt,
snd_pcm_format_t * format)
{
snd_pcm_format_t tmp;
tmp = snd_pcm_build_linear_format(wavfmt->wBitsPerSample,
wavfmt->wBitsPerSample, wavfmt->wBitsPerSample == 8 ? 1 : 0, 0);
if ( tmp == SND_PCM_FORMAT_UNKNOWN )
return -EINVAL;
*format = tmp;
return 0;
}
/* set hardware and software params */
static int set_hwparams(struct recorder * rec, const WAVEFORMATEX *wavfmt,
unsigned int buffertime, unsigned int periodtime)
{
snd_pcm_hw_params_t *params;
int err;
unsigned int rate;
snd_pcm_format_t format;
snd_pcm_uframes_t size;
snd_pcm_t *handle = (snd_pcm_t *)rec->wavein_hdl;
rec->buffer_time = buffertime;
rec->period_time = periodtime;
snd_pcm_hw_params_alloca(¶ms);
err = snd_pcm_hw_params_any(handle, params);
if (err < 0) {
dbg("Broken configuration for this PCM");
return err;
}
err = snd_pcm_hw_params_set_access(handle, params,
SND_PCM_ACCESS_RW_INTERLEAVED);
if (err < 0) {
dbg("Access type not available");
return err;
}
err = format_ms_to_alsa(wavfmt, &format);
if (err) {
dbg("Invalid format");
return - EINVAL;
}
err = snd_pcm_hw_params_set_format(handle, params, format);
if (err < 0) {
dbg("Sample format non available");
return err;
}
err = snd_pcm_hw_params_set_channels(handle, params, wavfmt->nChannels);
if (err < 0) {
dbg("Channels count non available");
return err;
}
rate = wavfmt->nSamplesPerSec;
err = snd_pcm_hw_params_set_rate_near(handle, params, &rate, 0);
if (err < 0) {
dbg("Set rate failed");
return err;
}
if(rate != wavfmt->nSamplesPerSec) {
dbg("Rate mismatch");
return -EINVAL;
}
if (rec->buffer_time == 0 || rec->period_time == 0) {
err = snd_pcm_hw_params_get_buffer_time_max(params,
&rec->buffer_time, 0);
assert(err >= 0);
if (rec->buffer_time > 500000)
rec->buffer_time = 500000;
rec->period_time = rec->buffer_time / 4;
}
err = snd_pcm_hw_params_set_period_time_near(handle, params,
&rec->period_time, 0);
if (err < 0) {
dbg("set period time fail");
return err;
}
err = snd_pcm_hw_params_set_buffer_time_near(handle, params,
&rec->buffer_time, 0);
if (err < 0) {
dbg("set buffer time failed");
return err;
}
err = snd_pcm_hw_params_get_period_size(params, &size, 0);
if (err < 0) {
dbg("get period size fail");
return err;
}
rec->period_frames = size;
err = snd_pcm_hw_params_get_buffer_size(params, &size);
if (size == rec->period_frames) {
dbg("Can't use period equal to buffer size (%lu == %lu)",
size, rec->period_frames);
return -EINVAL;
}
rec->buffer_frames = size;
rec->bits_per_frame = wavfmt->wBitsPerSample;
/* set to driver */
err = snd_pcm_hw_params(handle, params);
if (err < 0) {
dbg("Unable to install hw params:");
return err;
}
return 0;
}
static int set_swparams(struct recorder * rec)
{
int err;
snd_pcm_sw_params_t *swparams;
snd_pcm_t * handle = (snd_pcm_t*)(rec->wavein_hdl);
/* sw para */
snd_pcm_sw_params_alloca(&swparams);
err = snd_pcm_sw_params_current(handle, swparams);
if (err < 0) {
dbg("get current sw para fail");
return err;
}
err = snd_pcm_sw_params_set_avail_min(handle, swparams,
rec->period_frames);
if (err < 0) {
dbg("set avail min failed");
return err;
}
/* set a value bigger than the buffer frames to prevent the auto start.
* we use the snd_pcm_start to explicit start the pcm */
err = snd_pcm_sw_params_set_start_threshold(handle, swparams,
rec->buffer_frames * 2);
if (err < 0) {
dbg("set start threshold fail");
return err;
}
if ( (err = snd_pcm_sw_params(handle, swparams)) < 0) {
dbg("unable to install sw params:");
return err;
}
return 0;
}
static int set_params(struct recorder *rec, WAVEFORMATEX *fmt,
unsigned int buffertime, unsigned int periodtime)
{
int err;
WAVEFORMATEX defmt = DEFAULT_FORMAT;
if (fmt == NULL) {
fmt = &defmt;
}
err = set_hwparams(rec, fmt, buffertime, periodtime);
if (err)
return err;
err = set_swparams(rec);
if (err)
return err;
return 0;
}
/*
* Underrun and suspend recovery
*/
static int xrun_recovery(snd_pcm_t *handle, int err)
{
if (err == -EPIPE) { /* over-run */
if (show_xrun)
printf("!!!!!!overrun happend!!!!!!");
err = snd_pcm_prepare(handle);
if (err < 0) {
if (show_xrun)
printf("Can't recovery from overrun,"
"prepare failed: %s\n", snd_strerror(err));
return err;
}
return 0;
} else if (err == -ESTRPIPE) {
while ((err = snd_pcm_resume(handle)) == -EAGAIN)
usleep(200000); /* wait until the suspend flag is released */
if (err < 0) {
err = snd_pcm_prepare(handle);
if (err < 0) {
if (show_xrun)
printf("Can't recovery from suspend,"
"prepare failed: %s\n", snd_strerror(err));
return err;
}
}
return 0;
}
return err;
}
static ssize_t pcm_read(struct recorder *rec, size_t rcount)
{
ssize_t r;
size_t count = rcount;
char *data;
snd_pcm_t *handle = (snd_pcm_t *)rec->wavein_hdl;
if(!handle)
return -EINVAL;
data = rec->audiobuf;
while (count > 0) {
r = snd_pcm_readi(handle, data, count);
if (r == -EAGAIN || (r >= 0 && (size_t)r < count)) {
snd_pcm_wait(handle, 100);
} else if (r < 0) {
if(xrun_recovery(handle, r) < 0) {
return -1;
}
}
if (r > 0) {
count -= r;
data += r * rec->bits_per_frame / 8;
}
}
return rcount;
}
static void * record_thread_proc(void * para)
{
struct recorder * rec = (struct recorder *) para;
size_t frames, bytes;
sigset_t mask, oldmask;
sigemptyset(&mask);
sigaddset(&mask, SIGINT);
sigaddset(&mask, SIGTERM);
pthread_sigmask(SIG_BLOCK, &mask, &oldmask);
while(1) {
frames = rec->period_frames;
bytes = frames * rec->bits_per_frame / 8;
/* closing, exit the thread */
if (rec->state == RECORD_STATE_CLOSING)
break;
if(rec->state < RECORD_STATE_RECORDING)
usleep(100000);
if (pcm_read(rec, frames) != frames) {
return NULL;
}
if (rec->on_data_ind)
rec->on_data_ind(rec->audiobuf, bytes,
rec->user_cb_para);
}
return rec;
}
static int create_record_thread(void * para, pthread_t * tidp)
{
int err;
err = pthread_create(tidp, NULL, record_thread_proc, (void *)para);
if (err != 0)
return err;
return 0;
}
#if 0 /* don't use it now... cuz only one buffer supported */
static void free_rec_buffer(struct recorder * rec)
{
if (rec->bufheader) {
unsigned int i;
struct bufinfo *info = (struct bufinfo *) rec->bufheader;
assert(rec->bufcount > 0);
for (i = 0; i < rec->bufcount; ++i) {
if (info->data) {
free(info->data);
info->data = NULL;
info->bufsize = 0;
info->audio_bytes = 0;
}
info++;
}
free(rec->bufheader);
rec->bufheader = NULL;
}
rec->bufcount = 0;
}
static int prepare_rec_buffer(struct recorder * rec )
{
struct bufinfo *buffers;
unsigned int i;
int err;
size_t sz;
/* the read and QISRWrite is blocked, currently only support one buffer,
* if overrun too much, need more buffer and another new thread
* to write the audio to network */
rec->bufcount = 1;
sz = sizeof(struct bufinfo)*rec->bufcount;
buffers=(struct bufinfo*)malloc(sz);
if (!buffers) {
rec->bufcount = 0;
goto fail;
}
memset(buffers, 0, sz);
rec->bufheader = buffers;
for (i = 0; i < rec->bufcount; ++i) {
buffers[i].bufsize =
(rec->period_frames * rec->bits_per_frame / 8);
buffers[i].data = (char *)malloc(buffers[i].bufsize);
if (!buffers[i].data) {
buffers[i].bufsize = 0;
goto fail;
}
buffers[i].audio_bytes = 0;
}
return 0;
fail:
free_rec_buffer(rec);
return -ENOMEM;
}
#else
static void free_rec_buffer(struct recorder * rec)
{
if (rec->audiobuf) {
free(rec->audiobuf);
rec->audiobuf = NULL;
}
}
static int prepare_rec_buffer(struct recorder * rec )
{
/* the read and QISRWrite is blocked, currently only support one buffer,
* if overrun too much, need more buffer and another new thread
* to write the audio to network */
size_t sz = (rec->period_frames * rec->bits_per_frame / 8);
rec->audiobuf = (char *)malloc(sz);
if(!rec->audiobuf)
return -ENOMEM;
return 0;
}
#endif
static int open_recorder_internal(struct recorder * rec,
record_dev_id dev, WAVEFORMATEX * fmt)
{
int err = 0;
err = snd_pcm_open((snd_pcm_t **)&rec->wavein_hdl, dev.u.name,
SND_PCM_STREAM_CAPTURE, 0);
if(err < 0)
goto fail;
err = set_params(rec, fmt, DEF_BUFF_TIME, DEF_PERIOD_TIME);
if(err)
goto fail;
assert(rec->bufheader == NULL);
err = prepare_rec_buffer(rec);
if(err)
goto fail;
err = create_record_thread((void*)rec,
&rec->rec_thread);
if(err)
goto fail;
return 0;
fail:
if(rec->wavein_hdl)
snd_pcm_close((snd_pcm_t *) rec->wavein_hdl);
rec->wavein_hdl = NULL;
free_rec_buffer(rec);
return err;
}
static void close_recorder_internal(struct recorder *rec)
{
snd_pcm_t * handle;
handle = (snd_pcm_t *) rec->wavein_hdl;
/* may be the thread is blocked at read, cancel it */
pthread_cancel(rec->rec_thread);
/* wait for the pcm thread quit first */
pthread_join(rec->rec_thread, NULL);
if(handle) {
snd_pcm_close(handle);
rec->wavein_hdl = NULL;
}
free_rec_buffer(rec);
}
/* return the count of pcm device */
/* list all cards */
static int get_pcm_device_cnt(snd_pcm_stream_t stream)
{
void **hints, **n;
char *io, *filter, *name;
int cnt = 0;
if (snd_device_name_hint(-1, "pcm", &hints) < 0)
return 0;
n = hints;
filter = stream == SND_PCM_STREAM_CAPTURE ? "Input" : "Output";
while (*n != NULL) {
io = snd_device_name_get_hint(*n, "IOID");
name = snd_device_name_get_hint(*n, "NAME");
if (name && (io == NULL || strcmp(io, filter) == 0))
cnt ++;
if (io != NULL)
free(io);
if (name != NULL)
free(name);
n++;
}
snd_device_name_free_hint(hints);
return cnt;
}
#if 0
static void free_name_desc(char **name_or_desc)
{
char **ss;
ss = name_or_desc;
if(NULL == name_or_desc)
return;
while(*name_or_desc) {
free(*name_or_desc);
*name_or_desc = NULL;
name_or_desc++;
}
free(ss);
}
/* return success: total count, need free the name and desc buffer
* fail: -1 , *name_out and *desc_out will be NULL */
static int list_pcm(snd_pcm_stream_t stream, char**name_out,
char ** desc_out)
{
void **hints, **n;
char **name, **descr;
char *io;
const char *filter;
int cnt = 0;
int i = 0;
if (snd_device_name_hint(-1, "pcm", &hints) < 0)
return 0;
n = hints;
cnt = get_pcm_device_cnt(stream);
if(!cnt) {
goto fail;
}
*name_out = calloc(sizeof(char *) , (1+cnt));
if (*name_out == NULL)
goto fail;
*desc_out = calloc(sizeof(char *) , (1 + cnt));
if (*desc_out == NULL)
goto fail;
/* the last one is a flag, NULL */
name_out[cnt] = NULL;
desc_out[cnt] = NULL;
name = name_out;
descr = desc_out;
filter = stream == SND_PCM_STREAM_CAPTURE ? "Input" : "Output";
while (*n != NULL && i < cnt) {
*name = snd_device_name_get_hint(*n, "NAME");
*descr = snd_device_name_get_hint(*n, "DESC");
io = snd_device_name_get_hint(*n, "IOID");
if (name == NULL ||
(io != NULL && strcmp(io, filter) != 0) ){
if (*name) free(*name);
if (*descr) free(*descr);
} else {
if (*descr == NULL) {
*descr = malloc(4);
memset(*descr, 0, 4);
}
name++;
descr++;
i++;
}
if (io != NULL)
free(io);
n++;
}
snd_device_name_free_hint(hints);
return cnt;
fail:
free_name_desc(name_out);
free_name_desc(desc_out);
snd_device_name_free_hint(hints);
return -1;
}
#endif
/* -------------------------------------
* Interfaces
--------------------------------------*/
/* the device id is a pcm string name in linux */
record_dev_id get_default_input_dev()
{
record_dev_id id;
id.u.name = "default";
return id;
}
record_dev_id * list_input_device()
{
// TODO: unimplemented
return NULL;
}
int get_input_dev_num()
{
return get_pcm_device_cnt(SND_PCM_STREAM_CAPTURE);
}
/* callback will be run on a new thread */
int create_recorder(struct recorder ** out_rec,
void (*on_data_ind)(char *data, unsigned long len, void *user_cb_para),
void* user_cb_para)
{
struct recorder * myrec;
myrec = (struct recorder *)malloc(sizeof(struct recorder));
if(!myrec)
return -RECORD_ERR_MEMFAIL;
memset(myrec, 0, sizeof(struct recorder));
myrec->on_data_ind = on_data_ind;
myrec->user_cb_para = user_cb_para;
myrec->state = RECORD_STATE_CREATED;
*out_rec = myrec;
return 0;
}
void destroy_recorder(struct recorder *rec)
{
if(!rec)
return;
free(rec);
}
int open_recorder(struct recorder * rec, record_dev_id dev, WAVEFORMATEX * fmt)
{
int ret = 0;
if(!rec )
return -RECORD_ERR_INVAL;
if(rec->state >= RECORD_STATE_READY)
return 0;
ret = open_recorder_internal(rec, dev, fmt);
if(ret == 0)
rec->state = RECORD_STATE_READY;
return 0;
}
void close_recorder(struct recorder *rec)
{
if(rec == NULL || rec->state < RECORD_STATE_READY)
return;
if(rec->state == RECORD_STATE_RECORDING)
stop_record(rec);
rec->state = RECORD_STATE_CLOSING;
close_recorder_internal(rec);
rec->state = RECORD_STATE_CREATED;
}
int start_record(struct recorder * rec)
{
int ret;
if(rec == NULL)
return -RECORD_ERR_INVAL;
if( rec->state < RECORD_STATE_READY)
return -RECORD_ERR_NOT_READY;
if( rec->state == RECORD_STATE_RECORDING)
return 0;
ret = start_record_internal((snd_pcm_t *)rec->wavein_hdl);
if(ret == 0)
rec->state = RECORD_STATE_RECORDING;
return ret;
}
int stop_record(struct recorder * rec)
{
int ret;
if(rec == NULL)
return -RECORD_ERR_INVAL;
if( rec->state < RECORD_STATE_RECORDING)
return 0;
rec->state = RECORD_STATE_STOPPING;
ret = stop_record_internal((snd_pcm_t *)rec->wavein_hdl);
if(ret == 0) {
rec->state = RECORD_STATE_READY;
}
return ret;
}
int is_record_stopped(struct recorder *rec)
{
if(rec->state == RECORD_STATE_RECORDING)
return 0;
return is_stopped_internal(rec);
}