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