108 lines
2.8 KiB
C
108 lines
2.8 KiB
C
/*
|
|
This file contains core routines for the PCM sub-system.
|
|
|
|
pcm_data_play_task()
|
|
Triggered by the driver ISR when further data for play mode is required.
|
|
It handles the play buffer allocation and forwards control to 'data' and 'drained'
|
|
callbacks in Lua land.
|
|
|
|
pcm_data_rec_task() - n/a yet
|
|
Triggered by the driver ISR when data for record mode is available.
|
|
|
|
*/
|
|
|
|
#include "lauxlib.h"
|
|
#include "task/task.h"
|
|
#include "c_string.h"
|
|
#include "c_stdlib.h"
|
|
|
|
#include "pcm.h"
|
|
|
|
static void dispatch_callback( lua_State *L, int self_ref, int cb_ref, int returns )
|
|
{
|
|
if (cb_ref != LUA_NOREF) {
|
|
lua_rawgeti( L, LUA_REGISTRYINDEX, cb_ref );
|
|
lua_rawgeti( L, LUA_REGISTRYINDEX, self_ref );
|
|
lua_call( L, 1, returns );
|
|
}
|
|
}
|
|
|
|
void pcm_data_vu( task_param_t param, uint8 prio )
|
|
{
|
|
cfg_t *cfg = (cfg_t *)param;
|
|
lua_State *L = lua_getstate();
|
|
|
|
if (cfg->cb_vu_ref != LUA_NOREF) {
|
|
lua_rawgeti( L, LUA_REGISTRYINDEX, cfg->cb_vu_ref );
|
|
lua_rawgeti( L, LUA_REGISTRYINDEX, cfg->self_ref );
|
|
lua_pushnumber( L, (LUA_NUMBER)(cfg->vu_peak) );
|
|
lua_call( L, 2, 0 );
|
|
}
|
|
}
|
|
|
|
void pcm_data_play( task_param_t param, uint8 prio )
|
|
{
|
|
cfg_t *cfg = (cfg_t *)param;
|
|
pcm_buf_t *buf = &(cfg->bufs[cfg->fbuf_idx]);
|
|
size_t string_len;
|
|
const char *data = NULL;
|
|
uint8_t need_pop = FALSE;
|
|
lua_State *L = lua_getstate();
|
|
|
|
// retrieve new data from callback
|
|
if ((cfg->isr_throttled >= 0) &&
|
|
(cfg->cb_data_ref != LUA_NOREF)) {
|
|
dispatch_callback( L, cfg->self_ref, cfg->cb_data_ref, 1 );
|
|
need_pop = TRUE;
|
|
|
|
if (lua_type( L, -1 ) == LUA_TSTRING) {
|
|
data = lua_tolstring( L, -1, &string_len );
|
|
if (string_len > buf->buf_size) {
|
|
uint8_t *new_data = (uint8_t *) c_malloc( string_len );
|
|
if (new_data) {
|
|
if (buf->data) c_free( buf->data );
|
|
buf->buf_size = string_len;
|
|
buf->data = new_data;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (data) {
|
|
size_t to_copy = string_len > buf->buf_size ? buf->buf_size : string_len;
|
|
c_memcpy( buf->data, data, to_copy );
|
|
|
|
buf->rpos = 0;
|
|
buf->len = to_copy;
|
|
buf->empty = FALSE;
|
|
dbg_platform_gpio_write( PLATFORM_GPIO_HIGH );
|
|
lua_pop( L, 1 );
|
|
|
|
if (cfg->isr_throttled > 0) {
|
|
uint8_t other_buf = cfg->fbuf_idx ^ 1;
|
|
|
|
if (cfg->bufs[other_buf].empty) {
|
|
// rerun data callback to get next buffer chunk
|
|
dbg_platform_gpio_write( PLATFORM_GPIO_LOW );
|
|
cfg->fbuf_idx = other_buf;
|
|
pcm_data_play( param, 0 );
|
|
}
|
|
// unthrottle ISR
|
|
cfg->isr_throttled = 0;
|
|
}
|
|
} else {
|
|
dbg_platform_gpio_write( PLATFORM_GPIO_HIGH );
|
|
if (need_pop) lua_pop( L, 1 );
|
|
|
|
if (cfg->isr_throttled > 0) {
|
|
// ISR found no further data
|
|
// this was the last invocation of the reader task, fire drained cb
|
|
|
|
cfg->isr_throttled = -1;
|
|
|
|
dispatch_callback( L, cfg->self_ref, cfg->cb_drained_ref, 0 );
|
|
}
|
|
}
|
|
|
|
}
|