Add speak_sd example for issue #149

Add speak_sd example for issue #149

examples/Basics/speak_sd/speak_sd.ino

@@ -0,0 +1,142 @@
+/*
+ * SPDX-FileCopyrightText: 2024 M5Stack Technology CO LTD
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Play wav file from SD card
+ *
+ ****************************************************************
+ * Prepare a file named "resources_speak_sd.wav" in the root of your SD card
+ * Wav file format : 44100Hz 16bit mono
+ *
+ * Download it from https://github.com/m5stack/M5Core2/wiki
+ * or you can make it.
+ * Example of conversion using ffmpeg
+ * ffmpeg -i input.wav -vn -ac 1 -ar 44100 -acodec pcm_s16le -f wav resources_speak_sd.wav
+ ****************************************************************
+*/
+#include <M5Core2.h>
+
+#define WAV_FILE_NAME "/resources_speak_sd.wav"
+
+File wavFile;
+uint8_t buffer[1024];
+bool play{}, play_loop{true};
+
+struct __attribute__((packed)) wav_header_t {
+ char RIFF[4];
+ uint32_t chunk_size;
+ char WAVEfmt[8];
+ uint32_t fmt_chunk_size;
+ uint16_t audiofmt;
+ uint16_t channel;
+ uint32_t sample_rate;
+ uint32_t byte_per_sec;
+ uint16_t block_size;
+ uint16_t bit_per_sample;
+};
+struct __attribute__((packed)) sub_chunk_t {
+ char identifier[4];
+ uint32_t chunk_size;
+};
+
+// Seek to the beginning of the audio data
+bool seek_file(File& f) {
+ f.seek(0);
+
+ // Read header
+ wav_header_t wheader{};
+ if (f.read((uint8_t*)&wheader, sizeof(wheader)) != sizeof(wheader)) {
+ return false;
+ }
+
+#if 0
+ ESP_LOGI("wav", "RIFF : %.4s" , wheader.RIFF );
+ ESP_LOGI("wav", "chunk_size : %d" , wheader.chunk_size );
+ ESP_LOGI("wav", "WAVEfmt : %.8s" , wheader.WAVEfmt );
+ ESP_LOGI("wav", "fmt_chunk_size : %d" , wheader.fmt_chunk_size);
+ ESP_LOGI("wav", "audiofmt : %d" , wheader.audiofmt );
+ ESP_LOGI("wav", "channel : %d" , wheader.channel );
+ ESP_LOGI("wav", "sample_rate : %d" , wheader.sample_rate );
+ ESP_LOGI("wav", "byte_per_sec : %d" , wheader.byte_per_sec );
+ ESP_LOGI("wav", "block_size : %d" , wheader.block_size );
+ ESP_LOGI("wav", "bit_per_sample : %d" , wheader.bit_per_sample);
+#endif
+
+ // Check format
+ // 44100 16bit mono linear PCM
+ if (memcmp(wheader.RIFF, "RIFF", 4) ||
+ memcmp(wheader.WAVEfmt, "WAVEfmt ", 8) || wheader.audiofmt != 1 ||
+ wheader.sample_rate != 44100 || wheader.bit_per_sample != 16 ||
+ wheader.channel != 1) {
+ Serial.printf("Illegal format");
+ return false;
+ }
+
+ // Find data chunk
+ sub_chunk_t c{};
+ while (true) {
+ if (f.read((uint8_t*)&c, sizeof(c)) != sizeof(c)) {
+ return false;
+ }
+ if (memcmp(c.identifier, "data", 4) == 0) {
+ break;
+ }
+ f.seek(f.position() + c.chunk_size);
+ }
+ return true;
+}
+
+void streaming(File& f) {
+ // No more read
+ if (!f.available()) {
+ // rewind to top (playback loop)
+ if (play_loop) {
+ seek_file(f);
+ }
+ return;
+ }
+ // Read and play
+ auto readed = f.read(buffer, sizeof(buffer));
+ // I2S write is blocking until the end of write
+ M5.Spk.PlaySound(buffer, readed);
+}
+
+void setup() {
+ // LCDEnable,SDEnable,SerialEnable, I2CEnable, mbus_mode_t,SpeakerEnable
+ M5.begin(true, true, true, true, mbus_mode_t::kMBusModeOutput, true);
+
+ M5.Lcd.setTextColor(WHITE);
+ M5.Lcd.setCursor(10, 10);
+ M5.Lcd.printf("Speak Test!");
+
+ wavFile = SD.open(WAV_FILE_NAME);
+ if (!wavFile) {
+ M5.Lcd.clear(TFT_RED);
+ M5.Lcd.setCursor(10, 10);
+ M5.Lcd.printf("Failed to open");
+ while (true) {
+ delay(1000);
+ }
+ }
+
+ play = seek_file(wavFile);
+ if (!play) {
+ M5.Lcd.setCursor(10, 10);
+ M5.Lcd.printf("Illegal format");
+ }
+ M5.Lcd.clear(play ? TFT_DARKGREEN : TFT_PURPLE);
+}
+
+void loop() {
+ if (play) {
+ streaming(wavFile);
+
+ auto pos = M5.Touch.getPressPoint();
+ if (pos.x >= 0 && pos.x < M5.Lcd.width() && pos.y >= 0 &&
+ pos.y < M5.Lcd.height()) {
+ Serial.println("Repeat");
+ seek_file(wavFile);
+ }
+ }
+}