[audio, i2s_audio, speaker] Media Player Components PR2 (#8164)

Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>

esphome/components/audio/audio.cpp

@@ -0,0 +1,67 @@
+#include "audio.h"
+
+namespace esphome {
+namespace audio {
+
+// Euclidean's algorithm for finding the greatest common divisor
+static uint32_t gcd(uint32_t a, uint32_t b) {
+  while (b != 0) {
+    uint32_t t = b;
+    b = a % b;
+    a = t;
+  }
+  return a;
+}
+
+AudioStreamInfo::AudioStreamInfo(uint8_t bits_per_sample, uint8_t channels, uint32_t sample_rate)
+    : bits_per_sample_(bits_per_sample), channels_(channels), sample_rate_(sample_rate) {
+  this->ms_sample_rate_gcd_ = gcd(1000, this->sample_rate_);
+  this->bytes_per_sample_ = (this->bits_per_sample_ + 7) / 8;
+}
+
+uint32_t AudioStreamInfo::frames_to_microseconds(uint32_t frames) const {
+  return (frames * 1000000 + (this->sample_rate_ >> 1)) / this->sample_rate_;
+}
+
+uint32_t AudioStreamInfo::frames_to_milliseconds_with_remainder(uint32_t *total_frames) const {
+  uint32_t unprocessable_frames = *total_frames % (this->sample_rate_ / this->ms_sample_rate_gcd_);
+  uint32_t frames_for_ms_calculation = *total_frames - unprocessable_frames;
+
+  uint32_t playback_ms = (frames_for_ms_calculation * 1000) / this->sample_rate_;
+  *total_frames = unprocessable_frames;
+  return playback_ms;
+}
+
+bool AudioStreamInfo::operator==(const AudioStreamInfo &rhs) const {
+  return (this->bits_per_sample_ == rhs.get_bits_per_sample()) && (this->channels_ == rhs.get_channels()) &&
+         (this->sample_rate_ == rhs.get_sample_rate());
+}
+
+const char *audio_file_type_to_string(AudioFileType file_type) {
+  switch (file_type) {
+#ifdef USE_AUDIO_FLAC_SUPPORT
+    case AudioFileType::FLAC:
+      return "FLAC";
+#endif
+#ifdef USE_AUDIO_MP3_SUPPORT
+    case AudioFileType::MP3:
+      return "MP3";
+#endif
+    case AudioFileType::WAV:
+      return "WAV";
+    default:
+      return "unknown";
+  }
+}
+
+void scale_audio_samples(const int16_t *audio_samples, int16_t *output_buffer, int16_t scale_factor,
+                         size_t samples_to_scale) {
+  // Note the assembly dsps_mulc function has audio glitches if the input and output buffers are the same.
+  for (int i = 0; i < samples_to_scale; i++) {
+    int32_t acc = (int32_t) audio_samples[i] * (int32_t) scale_factor;
+    output_buffer[i] = (int16_t) (acc >> 15);
+  }
+}
+
+}  // namespace audio
+}  // namespace esphome