268 lines
6.8 KiB
C
268 lines
6.8 KiB
C
// Module for interfacing with PCM functionality
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#include "module.h"
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#include "lauxlib.h"
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#include "task/task.h"
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#include <string.h>
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#include <stdlib.h>
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#include "pcm/pcm.h"
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#include "pcm/pcm_drv.h"
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#define GET_PUD() pud_t *pud = (pud_t *)luaL_checkudata(L, 1, "pcm.driver"); \
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cfg_t *cfg = &(pud->cfg);
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#define UNREF_CB(_cb) luaL_unref( L, LUA_REGISTRYINDEX, _cb ); \
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_cb = LUA_NOREF;
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#define COND_REF(_cond) _cond ? luaL_ref( L, LUA_REGISTRYINDEX ) : LUA_NOREF
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// task handles
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task_handle_t pcm_data_vu_task, pcm_data_play_task, pcm_start_play_task;
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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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static int pcm_drv_free( lua_State *L )
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{
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GET_PUD();
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UNREF_CB( cfg->cb_data_ref );
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UNREF_CB( cfg->cb_drained_ref );
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UNREF_CB( cfg->cb_paused_ref );
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UNREF_CB( cfg->cb_stopped_ref );
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UNREF_CB( cfg->cb_vu_ref );
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UNREF_CB( cfg->self_ref );
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if (cfg->bufs[0].data) {
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free( cfg->bufs[0].data );
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cfg->bufs[0].data = NULL;
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}
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if (cfg->bufs[1].data) {
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free( cfg->bufs[1].data );
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cfg->bufs[1].data = NULL;
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}
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return 0;
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}
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// Lua: drv:close()
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static int pcm_drv_close( lua_State *L )
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{
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GET_PUD();
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pud->drv->close( cfg );
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return pcm_drv_free( L );
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}
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// Lua: drv:stop(self)
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static int pcm_drv_stop( lua_State *L )
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{
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GET_PUD();
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// throttle ISR and reader
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cfg->isr_throttled = -1;
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pud->drv->stop( cfg );
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// invalidate the buffers
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cfg->bufs[0].empty = cfg->bufs[1].empty = TRUE;
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dispatch_callback( L, cfg->self_ref, cfg->cb_stopped_ref, 0 );
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return 0;
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}
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// Lua: drv:pause(self)
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static int pcm_drv_pause( lua_State *L )
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{
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GET_PUD();
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// throttle ISR and reader
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cfg->isr_throttled = -1;
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pud->drv->stop( cfg );
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dispatch_callback( L, cfg->self_ref, cfg->cb_paused_ref, 0 );
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return 0;
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}
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static void pcm_start_play( task_param_t param, uint8 prio )
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{
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lua_State *L = lua_getstate();
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pud_t *pud = (pud_t *)param;
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cfg_t *cfg = &(pud->cfg);
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// stop driver before starting it in case it hasn't been stopped from Lua
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pud->drv->stop( cfg );
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if (!pud->drv->play( cfg )) {
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luaL_error( L, "pcm driver start" );
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}
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// unthrottle ISR and reader
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pud->cfg.isr_throttled = 0;
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}
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// Lua: drv:play(self, rate)
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static int pcm_drv_play( lua_State *L )
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{
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GET_PUD();
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cfg->rate = luaL_optinteger( L, 2, PCM_RATE_8K );
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luaL_argcheck( L, (cfg->rate >= PCM_RATE_1K) && (cfg->rate <= PCM_RATE_16K), 2, "invalid bit rate" );
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if (cfg->self_ref == LUA_NOREF) {
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lua_pushvalue( L, 1 ); // copy self userdata to the top of stack
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cfg->self_ref = luaL_ref( L, LUA_REGISTRYINDEX );
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}
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// schedule actions for play in separate task since drv:play() might have been called
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// in the callback fn of pcm_data_play() which in turn gets called when starting play...
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task_post_low( pcm_start_play_task, (os_param_t)pud );
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return 0;
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}
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// Lua: drv.on(self, event, cb_fn)
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static int pcm_drv_on( lua_State *L )
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{
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size_t len;
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const char *event;
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uint8_t is_func = FALSE;
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GET_PUD();
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event = luaL_checklstring( L, 2, &len );
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if (lua_isfunction(L, 3)) {
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lua_pushvalue( L, 3 ); // copy argument (func) to the top of stack
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is_func = TRUE;
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}
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if ((len == 4) && (strcmp( event, "data" ) == 0)) {
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luaL_unref( L, LUA_REGISTRYINDEX, cfg->cb_data_ref);
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cfg->cb_data_ref = COND_REF( is_func );
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} else if ((len == 7) && (strcmp( event, "drained" ) == 0)) {
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luaL_unref( L, LUA_REGISTRYINDEX, cfg->cb_drained_ref);
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cfg->cb_drained_ref = COND_REF( is_func );
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} else if ((len == 6) && (strcmp( event, "paused" ) == 0)) {
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luaL_unref( L, LUA_REGISTRYINDEX, cfg->cb_paused_ref);
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cfg->cb_paused_ref = COND_REF( is_func );
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} else if ((len == 7) && (strcmp( event, "stopped" ) == 0)) {
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luaL_unref( L, LUA_REGISTRYINDEX, cfg->cb_stopped_ref);
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cfg->cb_stopped_ref = COND_REF( is_func );
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} else if ((len == 2) && (strcmp( event, "vu" ) == 0)) {
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luaL_unref( L, LUA_REGISTRYINDEX, cfg->cb_vu_ref);
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cfg->cb_vu_ref = COND_REF( is_func );
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int freq = luaL_optinteger( L, 4, 10 );
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luaL_argcheck( L, (freq > 0) && (freq <= 200), 4, "invalid range" );
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cfg->vu_freq = (uint8_t)freq;
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} else {
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if (is_func) {
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// need to pop pushed function arg
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lua_pop( L, 1 );
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}
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return luaL_error( L, "method not supported" );
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}
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return 0;
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}
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// Lua: pcm.new( type, pin )
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static int pcm_new( lua_State *L )
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{
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pud_t *pud = (pud_t *) lua_newuserdata( L, sizeof( pud_t ) );
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cfg_t *cfg = &(pud->cfg);
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int driver;
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cfg->rbuf_idx = cfg->fbuf_idx = 0;
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cfg->isr_throttled = -1; // start ISR and reader in throttled mode
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driver = luaL_checkinteger( L, 1 );
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luaL_argcheck( L, (driver >= 0) && (driver < PCM_DRIVER_END), 1, "invalid driver" );
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cfg->self_ref = LUA_NOREF;
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cfg->cb_data_ref = cfg->cb_drained_ref = LUA_NOREF;
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cfg->cb_paused_ref = cfg->cb_stopped_ref = LUA_NOREF;
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cfg->cb_vu_ref = LUA_NOREF;
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cfg->bufs[0].buf_size = cfg->bufs[1].buf_size = 0;
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cfg->bufs[0].data = cfg->bufs[1].data = NULL;
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cfg->bufs[0].len = cfg->bufs[1].len = 0;
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cfg->bufs[0].rpos = cfg->bufs[1].rpos = 0;
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cfg->bufs[0].empty = cfg->bufs[1].empty = TRUE;
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cfg->vu_freq = 10;
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if (driver == PCM_DRIVER_SD) {
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cfg->pin = luaL_checkinteger( L, 2 );
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MOD_CHECK_ID(sigma_delta, cfg->pin);
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pud->drv = &pcm_drv_sd;
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pud->drv->init( cfg );
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/* set its metatable */
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lua_pushvalue( L, -1 ); // copy self userdata to the top of stack
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luaL_getmetatable( L, "pcm.driver" );
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lua_setmetatable( L, -2 );
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return 1;
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} else {
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pud->drv = NULL;
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return 0;
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}
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}
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LROT_BEGIN(pcm_driver, NULL, LROT_MASK_GC_INDEX)
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LROT_FUNCENTRY( __gc, pcm_drv_free )
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LROT_TABENTRY( __index, pcm_driver )
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LROT_FUNCENTRY( play, pcm_drv_play )
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LROT_FUNCENTRY( pause, pcm_drv_pause )
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LROT_FUNCENTRY( stop, pcm_drv_stop )
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LROT_FUNCENTRY( close, pcm_drv_close )
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LROT_FUNCENTRY( on, pcm_drv_on )
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LROT_END(pcm_driver, NULL, LROT_MASK_GC_INDEX)
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// Module function map
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LROT_BEGIN(pcm, NULL, 0)
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LROT_FUNCENTRY( new, pcm_new )
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LROT_NUMENTRY( SD, PCM_DRIVER_SD )
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LROT_NUMENTRY( RATE_1K, PCM_RATE_1K )
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LROT_NUMENTRY( RATE_2K, PCM_RATE_2K )
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LROT_NUMENTRY( RATE_4K, PCM_RATE_4K )
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LROT_NUMENTRY( RATE_5K, PCM_RATE_5K )
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LROT_NUMENTRY( RATE_8K, PCM_RATE_8K )
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LROT_NUMENTRY( RATE_10K, PCM_RATE_10K )
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LROT_NUMENTRY( RATE_12K, PCM_RATE_12K )
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LROT_NUMENTRY( RATE_16K, PCM_RATE_16K )
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LROT_END(pcm, NULL, 0)
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int luaopen_pcm( lua_State *L ) {
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luaL_rometatable( L, "pcm.driver", LROT_TABLEREF(pcm_driver));
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pcm_data_vu_task = task_get_id( pcm_data_vu );
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pcm_data_play_task = task_get_id( pcm_data_play );
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pcm_start_play_task = task_get_id( pcm_start_play );
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return 0;
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}
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NODEMCU_MODULE(PCM, "pcm", pcm, luaopen_pcm);
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