(wip) mono and dynamic sample rate support

software/platform/raspberry-pico-w/pico_hal_wrapper.c

@@ -77,12 +77,18 @@ static uint32_t ButtonsStatePrev = 0;
 
 // Rotary encoder
 // pio 0 is used
-PIO pio = pio1;
+static PIO pio = pio1;
 // state machine 0
-uint8_t sm = 0;
+static uint8_t sm = 0;
 
 static int new_value, delta, old_value = 0;
 
+static audio_i2s_config_t config = {
+    .freq = 44100,
+    .bps = 32,
+    .data_pin = 28,
+    .clock_pin_base = 26};
+
 // ===========================================================================================================
 // PROTOTYPES
 // ===========================================================================================================
@@ -261,14 +267,7 @@ void ost_system_initialize()
   gpio_set_function(SDCARD_MISO, GPIO_FUNC_SPI);
 
   //------------------- Init Sound
-  static const audio_i2s_config_t config = {
-      .freq = 44100,
-      .bps = 32,
-      .data_pin = 28,
-      .clock_pin_base = 26};
-
   i2s_program_setup(pio0, audio_i2s_dma_irq_handler, &i2s, &config);
-
   audio_init(&audio_ctx);
 
   // ------------ Everything is initialized, print stuff here
@@ -425,6 +424,9 @@ void ost_display_transfer_multi(uint8_t *buff, uint32_t btr)
 void ost_audio_play(const char *filename)
 {
   audio_play(&audio_ctx, filename);
+  config.freq = audio_ctx.audio_info.sample_rate;
+  config.channels = audio_ctx.audio_info.channels;
+  pico_i2s_set_frequency(&i2s, &config);
 
   i2s.buffer_index = 0;
 

software/platform/raspberry-pico-w/pico_i2s.c

@@ -18,50 +18,13 @@
 
 void pico_i2s_set_frequency(const pio_i2s *i2s, const audio_i2s_config_t *config)
 {
-    float bitClk = config->freq * config->bps * 2.0 /* channels */ * 2.0 /* edges per clock */;
+    // Pour le calcul de la fréquence, le nombre de canaux est toujours fixé à 2
+    // car c'est notre format de sortie I2S
+    // Dans le cas du mono, on l'a détecté en amont et on a copié l'échantillon dans la voie de droite
+    float bitClk = config->freq * config->bps * config->channels /* channels */ * 2.0 /* edges per clock */;
     pio_sm_set_clkdiv(i2s->pio, i2s->sm_dout, (float)clock_get_hz(clk_sys) / bitClk);
 }
 
-#if 0
-
-static bool audio_enabled;
-
-void audio_i2s_set_enabled(bool enabled)
-{
-    if (enabled != audio_enabled)
-    {
-#ifndef NDEBUG
-        if (enabled)
-        {
-            puts("Enabling PIO I2S audio\n");
-            printf("(on core %d\n", get_core_num());
-        }
-#endif
-        irq_set_enabled(DMA_IRQ_0 + PICO_AUDIO_I2S_DMA_IRQ, enabled);
-
-        if (enabled)
-        {
-            //  audio_start_dma_transfer();
-        }
-        else
-        {
-            /*
-            // if there was a buffer in flight, it will not be freed by DMA IRQ, let's do it manually
-            if (shared_state.playing_buffer)
-            {
-                give_audio_buffer(audio_i2s_consumer, shared_state.playing_buffer);
-                shared_state.playing_buffer = NULL;
-            }
-            */
-        }
-
-        pio_sm_set_enabled(audio_pio, shared_state.pio_sm, enabled);
-
-        audio_enabled = enabled;
-    }
-}
-#endif
-
 //---------------------------------------------------------------------------------------------------------------------------
 
 static void dma_double_buffer_init(pio_i2s *i2s)

software/platform/raspberry-pico-w/pico_i2s.h

@@ -20,13 +20,11 @@ extern "C"
 {
 #endif
 
-#define AUDIO_BUFFER_FRAMES SIZE_OF_SAMPLES
-#define STEREO_BUFFER_SIZE AUDIO_BUFFER_FRAMES * 2 // for left + right
-
     typedef struct
     {
         uint32_t freq;
         uint32_t bps;
+        uint16_t channels;
         uint8_t data_pin;
         uint8_t clock_pin_base;
 
@@ -48,6 +46,7 @@ extern "C"
 
     void i2s_program_setup(PIO pio, void (*dma_handler)(void), pio_i2s *i2s, const audio_i2s_config_t *config);
 
+    void pico_i2s_set_frequency(const pio_i2s *i2s, const audio_i2s_config_t *config);
     void i2s_start(pio_i2s *i2s);
     void i2s_stop(pio_i2s *i2s);
 

software/system/audio_player.c

@@ -10,11 +10,10 @@
 #include "ost_hal.h"
 #include "serializers.h"
 
-// Audio Double Buffer for DMA transfer
+int32_t audio_buf[STEREO_BUFFER_SIZE]; // x2 because we store L+R
-int32_t audio_buf[SIZE_OF_SAMPLES * 2]; // x2 because we store L+R
 
 // Audio Buffer for File Read
-uint8_t raw_buf[SIZE_OF_SAMPLES * 2 * 2]; // x2 for 16-bit, and x2 for L+R
+uint8_t raw_buf[AUDIO_BUFFER_FRAMES * 2 * 2]; // x2 for 16-bit, and x2 for L+R
 
 int32_t DAC_ZERO_VALUE = 1; //
 
@@ -59,12 +58,12 @@ void audio_init(audio_ctx_t *ctx)
     ctx->volume = 65;
     ctx->count = 0;
 
-    for (int i = 0; i < SIZE_OF_SAMPLES; i++)
+    for (int i = 0; i < STEREO_BUFFER_SIZE; i++)
     {
         audio_buf[i] = DAC_ZERO_VALUE;
     }
 
-    ctx->transfer_size = SIZE_OF_SAMPLES / 4;
+    ctx->transfer_size = STEREO_BUFFER_SIZE;
 }
 
 static int list_chunk_is_info_type(audio_ctx_t *ctx)
@@ -95,12 +94,14 @@ static int load_next_file(audio_ctx_t *ctx, const char *fname_ptr)
         fr = f_open(&ctx->fil, ctx->audio_info.filename, FA_READ);
         if (fr != FR_OK)
         {
-            debug_printf("ERROR: f_open %d\n\r", (int)fr);
+            debug_printf("ERROR: f_open %d for file: %s\n\r", (int)fr, fname_ptr);
         }
         ctx->idx_play++;
         FRESULT res = f_read(&ctx->fil, ctx->header, sizeof(ctx->header), &br);
-        // Find 'data' chunk
 
+        ctx->audio_info.channels = leu16_get(&ctx->header[22]);
+        ctx->audio_info.sample_rate = leu32_get(&ctx->header[24]);
+        // Find 'data' chunk
         offset = 0;
         while (1)
         {
@@ -116,9 +117,20 @@ static int load_next_file(audio_ctx_t *ctx, const char *fname_ptr)
             }
             else
             {
+                debug_printf("[AUDIO_PLAYER] Data not found, invalid file\r\n");
+                return 0;
                 break;
             }
         }
+
+        if (size == 0)
+        {
+            debug_printf("[AUDIO_PLAYER] Empty audio file\r\n");
+            return 0;
+        }
+        else
+        {
+            debug_printf("[AUDIO_PLAYER] Load WAV: \r\n - Channels: %d\r\n - Sample rate: %d\r\n", ctx->audio_info.channels, ctx->audio_info.sample_rate);
             ctx->audio_info.data_size = size;
             // printf("Audio data size = %d\n\r", (int) audio_info.data_size);
             ctx->audio_info.data_start = offset;
@@ -128,6 +140,7 @@ static int load_next_file(audio_ctx_t *ctx, const char *fname_ptr)
 
         return 0;
     }
+}
 
 static int get_level(uint32_t val)
 {
@@ -164,6 +177,7 @@ static int get_audio_buf(audio_ctx_t *ctx, int32_t *buf_32b)
     uint32_t lvl_r = 0;
 
     number = 0; // number to transfer (en octets)
+
     while (number < sizeof(raw_buf))
     {
         file_rest = ctx->audio_info.data_size - ctx->audio_info.data_offset;
@@ -192,18 +206,31 @@ static int get_audio_buf(audio_ctx_t *ctx, int32_t *buf_32b)
         }
     }
 
-    static bool onetime = true;
+    bool mono = ctx->audio_info.channels == 1;
+    uint32_t index = 4;
+    if (mono)
+    {
+        index = 2;
+    }
 
     // samples : total bytes devided by 2 (16 bits) and by two again (2 channels)
-    for (i = 0; i < number / 4; i++)
+    for (i = 0; i < number / index; i++)
     {
         // buf_32b[i * 2 + 0] = (int32_t)swap16b((int32_t)buf_16b[i * 2 + 0] * vol_table[ctx->volume]) + DAC_ZERO_VALUE; // L
         // buf_32b[i * 2 + 1] = (int32_t)swap16b((int32_t)buf_16b[i * 2 + 1] * vol_table[ctx->volume]) + DAC_ZERO_VALUE; // R
 
         // Avec le AUDIO PICO de waveshare, on entend un truc
 
-        buf_32b[i * 2] = ((int32_t)((int16_t)leu16_get(&raw_buf[i * 4]))) << 16;
+        buf_32b[i * 2] = ((int32_t)((int16_t)leu16_get(&raw_buf[i * index]))) << 16;
-        buf_32b[i * 2 + 1] = ((int32_t)((int16_t)leu16_get(&raw_buf[i * 4 + 2]))) << 16;
+
+        if (mono)
+        {
+            buf_32b[i * 2 + 1] = buf_32b[i * 2];
+        }
+        else
+        {
+            buf_32b[i * 2 + 1] = ((int32_t)((int16_t)leu16_get(&raw_buf[i * index + 2]))) << 16;
+        }
 
         // buf_32b[i * 2] = 1;
         // buf_32b[i * 2 + 1] = 4;
@@ -211,21 +238,9 @@ static int get_audio_buf(audio_ctx_t *ctx, int32_t *buf_32b)
         // lvl_l += ((int32_t)buf_16b[i * 2 + 0] * buf_16b[i * 2 + 0]) / 32768;
         // lvl_r += ((int32_t)buf_16b[i * 2 + 1] * buf_16b[i * 2 + 1]) / 32768;
     }
-    /*
-        if (onetime)
-        {
-            onetime = false;
-
-            for (int i = 0; i < 10; i++)
-            {
-                debug_printf("Sample left:  %d\r\n", buf_32b[i * 2]);
-                debug_printf("Sample right: %d\r\n", buf_32b[i * 2 + 1]);
-            }
-        }
-    */
     // ctx->audio_info.lvl_l = get_level(lvl_l / (number / 4));
     // ctx->audio_info.lvl_r = get_level(lvl_r / (number / 4));
-    ctx->transfer_size = (number / 2); // 32 bytes tranfers
+    ctx->transfer_size = number / 2; // 32 bytes tranfers
     return _next_is_end;
 }
 
@@ -245,11 +260,11 @@ int audio_process(audio_ctx_t *ctx)
     }
     else
     {
-        for (int i = 0; i < SIZE_OF_SAMPLES; i++)
+        for (int i = 0; i < STEREO_BUFFER_SIZE; i++)
         {
             audio_buf[i] = DAC_ZERO_VALUE;
         }
-        ctx->transfer_size = SIZE_OF_SAMPLES / 4;
+        ctx->transfer_size = STEREO_BUFFER_SIZE;
     }
     ctx->count++;
 

software/system/audio_player.h

@@ -6,7 +6,8 @@
 
 #include <ff.h>
 
-#define SIZE_OF_SAMPLES (128) // in bytes
+#define AUDIO_BUFFER_FRAMES (128)                  // in bytes
+#define STEREO_BUFFER_SIZE AUDIO_BUFFER_FRAMES * 2 // for left + right
 #define FILENAME_MAX_SIZE 260
 
 typedef struct
@@ -18,6 +19,8 @@ typedef struct
     uint32_t data_start;
     uint32_t data_size;
     uint32_t data_offset;
+    uint32_t sample_rate;
+    uint16_t channels;
     char artist[256];
     char title[256];
     char album[256];

software/system/filesystem.c

@@ -109,6 +109,7 @@ void filesystem_mount()
     }
 
     scan_files("");
+    scan_files("/ba869e4b-03d6-4249-9202-85b4cec767a7/assets");
 }
 
 uint32_t filesystem_get_capacity()

software/system/fs_task.c

@@ -50,7 +50,8 @@ typedef struct
     fs_result_cb_t cb;
 } ost_fs_event_t;
 
-#define STORY_DIR_OFFSET (UUID_SIZE + 1)
+#define ASSETS_DIR "/assets/"
+#define STORY_DIR_OFFSET (UUID_SIZE + 1) // +1 for the first '/' (filesystem root)
 
 // ===========================================================================================================
 // PRIVATE GLOBAL VARIABLES
@@ -68,9 +69,6 @@ static int PacketCounter = 0;
 
 static char ScratchFile[260];
 
-static const char *ImagesDir = "/images/";
-static const char *SoundsDir = "/sounds/";
-
 static uint8_t LedState = 0;
 
 // ===========================================================================================================
@@ -119,7 +117,7 @@ void FsTask(void *args)
                 if (OstContext.sound != NULL)
                 {
                     ScratchFile[STORY_DIR_OFFSET] = 0;
-                    strcat(ScratchFile, SoundsDir);
+                    strcat(ScratchFile, ASSETS_DIR);
                     strcat(ScratchFile, message->sound);
 
                     debug_printf("\r\n-------------------------------------------------------\r\nPlaying: %s\r\n", ScratchFile);
@@ -151,7 +149,7 @@ void FsTask(void *args)
                 if (OstContext.image != NULL)
                 {
                     ScratchFile[STORY_DIR_OFFSET] = 0;
-                    strcat(ScratchFile, ImagesDir);
+                    strcat(ScratchFile, ASSETS_DIR);
                     strcat(ScratchFile, message->image);
 
                     filesystem_display_image(ScratchFile);
@@ -168,7 +166,7 @@ void FsTask(void *args)
                     // Init current directory
                     ScratchFile[0] = '/';
                     memcpy(&ScratchFile[1], OstContext.uuid, UUID_SIZE);
-                    ScratchFile[1 + UUID_SIZE] = 0;
+                    ScratchFile[STORY_DIR_OFFSET] = 0;
                     success = true;
                 }
 

software/system/vm_task.c

@@ -164,6 +164,7 @@ void VmTask(void *args)
     ost_vm_state_t VmState = OST_VM_STATE_HOME;
     fs_task_scan_index(read_index_callback);
     bool run_script = false;
+    bool block_keys = false;
 
     while (1)
     {
@@ -176,11 +177,21 @@ void VmTask(void *args)
             case OST_VM_STATE_HOME:
                 switch (message->ev)
                 {
+                case VM_EV_END_OF_SOUND:
+                    block_keys = false;
+                    break;
+
                 case VM_EV_EXEC_HOME_INDEX:
                     // La lecture de l'index est terminée, on demande l'affichage des médias
+                    if (!block_keys)
+                    {
+                        block_keys = true;
                         fs_task_play_index();
+                    }
                     break;
                 case VM_EV_BUTTON_EVENT:
+                    if (!block_keys)
+                    {
                         // debug_printf("B: %x", message->button_mask);
                         if ((message->button_mask & OST_BUTTON_OK) == OST_BUTTON_OK)
                         {
@@ -188,6 +199,7 @@ void VmTask(void *args)
                             debug_printf("OK\r\n");
                             fs_task_load_story(m_rom_data);
                         }
+                    }
                     break;
                 case VM_EV_ERROR:
                 default: