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