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-rw-r--r--src/drivers/playback.cpp246
1 files changed, 246 insertions, 0 deletions
diff --git a/src/drivers/playback.cpp b/src/drivers/playback.cpp
new file mode 100644
index 00000000..46dec680
--- /dev/null
+++ b/src/drivers/playback.cpp
@@ -0,0 +1,246 @@
+#include "playback.hpp"
+
+#include "dac.hpp"
+
+#include <cstdint>
+
+#include "audio_element.h"
+#include "audio_event_iface.h"
+#include "audio_pipeline.h"
+#include "driver/i2s.h"
+#include "esp_err.h"
+#include "freertos/portmacro.h"
+#include "mp3_decoder.h"
+
+static const char* kTag = "PLAYBACK";
+static const i2s_port_t kI2SPort = I2S_NUM_0;
+
+namespace gay_ipod {
+
+static audio_element_status_t status_from_the_void(void* status) {
+ uintptr_t as_pointer_int = reinterpret_cast<uintptr_t>(status);
+ return static_cast<audio_element_status_t>(as_pointer_int);
+}
+
+auto DacAudioPlayback::create(AudioDac* dac)
+ -> cpp::result<std::unique_ptr<DacAudioPlayback>, Error> {
+ // Ensure we're soft-muted before initialising, in order to reduce protential
+ // clicks and pops.
+ dac->WriteVolume(255);
+
+ audio_pipeline_handle_t pipeline;
+ audio_element_handle_t fatfs_stream_reader;
+ audio_element_handle_t i2s_stream_writer;
+ audio_event_iface_handle_t event_interface;
+
+ audio_pipeline_cfg_t pipeline_config =
+ audio_pipeline_cfg_t(DEFAULT_AUDIO_PIPELINE_CONFIG());
+ pipeline = audio_pipeline_init(&pipeline_config);
+ if (pipeline == NULL) {
+ return cpp::fail(Error::PIPELINE_INIT);
+ }
+
+ fatfs_stream_cfg_t fatfs_stream_config =
+ fatfs_stream_cfg_t(FATFS_STREAM_CFG_DEFAULT());
+ fatfs_stream_config.type = AUDIO_STREAM_READER;
+ fatfs_stream_reader = fatfs_stream_init(&fatfs_stream_config);
+ if (fatfs_stream_reader == NULL) {
+ return cpp::fail(Error::PIPELINE_INIT);
+ }
+
+ i2s_stream_cfg_t i2s_stream_config = i2s_stream_cfg_t{
+ .type = AUDIO_STREAM_WRITER,
+ .i2s_config =
+ {
+ // static_cast bc esp-adf uses enums incorrectly
+ .mode = static_cast<i2s_mode_t>(I2S_MODE_MASTER | I2S_MODE_TX),
+ .sample_rate = 44100,
+ .bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT,
+ .channel_format = I2S_CHANNEL_FMT_RIGHT_LEFT,
+ .communication_format = I2S_COMM_FORMAT_STAND_I2S,
+ .intr_alloc_flags = ESP_INTR_FLAG_LOWMED,
+ .dma_buf_count = 8,
+ .dma_buf_len = 64,
+ .use_apll = false,
+ .tx_desc_auto_clear = false,
+ .fixed_mclk = 0,
+ .mclk_multiple = I2S_MCLK_MULTIPLE_DEFAULT,
+ .bits_per_chan = I2S_BITS_PER_CHAN_DEFAULT,
+ },
+ .i2s_port = kI2SPort,
+ .use_alc = false,
+ .volume = 0, // Does nothing; use AudioDac to change this.
+ .out_rb_size = I2S_STREAM_RINGBUFFER_SIZE,
+ .task_stack = I2S_STREAM_TASK_STACK,
+ .task_core = I2S_STREAM_TASK_CORE,
+ .task_prio = I2S_STREAM_TASK_PRIO,
+ .stack_in_ext = false,
+ .multi_out_num = 0,
+ .uninstall_drv = true,
+ .need_expand = false,
+ .expand_src_bits = I2S_BITS_PER_SAMPLE_16BIT,
+ };
+ i2s_stream_writer = i2s_stream_init(&i2s_stream_config);
+ if (i2s_stream_writer == NULL) {
+ return cpp::fail(Error::PIPELINE_INIT);
+ }
+
+ // NOTE: i2s_stream_init does some additional setup that hardcodes MCK as
+ // GPIO0. This happens to work fine for us, but be careful if changing.
+ i2s_pin_config_t pin_config = {.mck_io_num = GPIO_NUM_0,
+ .bck_io_num = GPIO_NUM_26,
+ .ws_io_num = GPIO_NUM_27,
+ .data_out_num = GPIO_NUM_5,
+ .data_in_num = I2S_PIN_NO_CHANGE};
+ if (esp_err_t err = i2s_set_pin(kI2SPort, &pin_config) != ESP_OK) {
+ ESP_LOGE(kTag, "failed to configure i2s pins %x", err);
+ return cpp::fail(Error::PIPELINE_INIT);
+ }
+
+ // TODO: Create encoders dynamically when we need them.
+ audio_element_handle_t mp3_decoder;
+ mp3_decoder_cfg_t mp3_config =
+ mp3_decoder_cfg_t(DEFAULT_MP3_DECODER_CONFIG());
+ mp3_decoder = mp3_decoder_init(&mp3_config);
+ assert(mp3_decoder != NULL);
+
+ audio_event_iface_cfg_t event_config = AUDIO_EVENT_IFACE_DEFAULT_CFG();
+ event_interface = audio_event_iface_init(&event_config);
+
+ audio_pipeline_set_listener(pipeline, event_interface);
+ audio_element_msg_set_listener(fatfs_stream_reader, event_interface);
+ audio_element_msg_set_listener(mp3_decoder, event_interface);
+ audio_element_msg_set_listener(i2s_stream_writer, event_interface);
+
+ // TODO: most of this is likely post-init, since it involves a decoder.
+ // All the elements of our pipeline have been initialised. Now switch them
+ // together.
+ audio_pipeline_register(pipeline, fatfs_stream_reader, "file");
+ audio_pipeline_register(pipeline, mp3_decoder, "dec");
+ audio_pipeline_register(pipeline, i2s_stream_writer, "i2s");
+
+ const char* link_tag[3] = {"file", "dec", "i2s"};
+ audio_pipeline_link(pipeline, &link_tag[0], 3);
+
+ return std::make_unique<DacAudioPlayback>(dac, pipeline, fatfs_stream_reader,
+ i2s_stream_writer, event_interface,
+ mp3_decoder);
+}
+
+DacAudioPlayback::DacAudioPlayback(AudioDac* dac,
+ audio_pipeline_handle_t pipeline,
+ audio_element_handle_t fatfs_stream_reader,
+ audio_element_handle_t i2s_stream_writer,
+ audio_event_iface_handle_t event_interface,
+ audio_element_handle_t mp3_decoder)
+ : dac_(dac),
+ pipeline_(pipeline),
+ fatfs_stream_reader_(fatfs_stream_reader),
+ i2s_stream_writer_(i2s_stream_writer),
+ event_interface_(event_interface),
+ mp3_decoder_(mp3_decoder) {}
+
+DacAudioPlayback::~DacAudioPlayback() {
+ dac_->WriteVolume(255);
+
+ audio_pipeline_remove_listener(pipeline_);
+ audio_element_msg_remove_listener(fatfs_stream_reader_, event_interface_);
+ audio_element_msg_remove_listener(mp3_decoder_, event_interface_);
+ audio_element_msg_remove_listener(i2s_stream_writer_, event_interface_);
+
+ audio_pipeline_stop(pipeline_);
+ audio_pipeline_wait_for_stop(pipeline_);
+ audio_pipeline_terminate(pipeline_);
+
+ audio_pipeline_unregister(pipeline_, fatfs_stream_reader_);
+ audio_pipeline_unregister(pipeline_, mp3_decoder_);
+ audio_pipeline_unregister(pipeline_, i2s_stream_writer_);
+
+ audio_event_iface_destroy(event_interface_);
+
+ audio_pipeline_deinit(pipeline_);
+ audio_element_deinit(fatfs_stream_reader_);
+ audio_element_deinit(i2s_stream_writer_);
+ audio_element_deinit(mp3_decoder_);
+}
+
+void DacAudioPlayback::Play(const std::string& filename) {
+ dac_->WriteVolume(255);
+ // TODO: handle reconfiguring the pipeline if needed.
+ audio_element_set_uri(fatfs_stream_reader_, filename.c_str());
+ audio_pipeline_run(pipeline_);
+ dac_->WriteVolume(volume_);
+}
+
+void DacAudioPlayback::Resume() {
+ // TODO.
+}
+void DacAudioPlayback::Pause() {
+ // TODO.
+}
+
+void DacAudioPlayback::ProcessEvents() {
+ while (1) {
+ audio_event_iface_msg_t event;
+ esp_err_t err =
+ audio_event_iface_listen(event_interface_, &event, portMAX_DELAY);
+ if (err != ESP_OK) {
+ ESP_LOGI(kTag, "error listening for event:%x", err);
+ continue;
+ }
+ ESP_LOGI(kTag, "received event, cmd %i", event.cmd);
+
+ if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
+ event.source == (void*)mp3_decoder_ &&
+ event.cmd == AEL_MSG_CMD_REPORT_MUSIC_INFO) {
+ audio_element_info_t music_info = {0};
+ audio_element_getinfo(mp3_decoder_, &music_info);
+ ESP_LOGI(kTag, "sample_rate=%d, bits=%d, ch=%d", music_info.sample_rates,
+ music_info.bits, music_info.channels);
+ audio_element_setinfo(i2s_stream_writer_, &music_info);
+ i2s_stream_set_clk(i2s_stream_writer_, music_info.sample_rates,
+ music_info.bits, music_info.channels);
+ }
+
+ if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
+ event.source == (void*)fatfs_stream_reader_ &&
+ event.cmd == AEL_MSG_CMD_REPORT_STATUS) {
+ audio_element_status_t status = status_from_the_void(event.data);
+ if (status == AEL_STATUS_STATE_FINISHED) {
+ // TODO: enqueue next track?
+ }
+ }
+
+ if (event.source_type == AUDIO_ELEMENT_TYPE_ELEMENT &&
+ event.source == (void*)i2s_stream_writer_ &&
+ event.cmd == AEL_MSG_CMD_REPORT_STATUS) {
+ audio_element_status_t status = status_from_the_void(event.data);
+ if (status == AEL_STATUS_STATE_FINISHED) {
+ // TODO.
+ return;
+ }
+ }
+
+ if (event.need_free_data) {
+ ESP_LOGI(kTag, "freeing event data");
+ free(event.data);
+ }
+ }
+}
+
+/* for gapless */
+void DacAudioPlayback::set_next_file(const std::string& filename) {
+ next_filename_ = filename;
+}
+
+void DacAudioPlayback::set_volume(uint8_t volume) {
+ volume_ = volume;
+ // TODO: don't write immediately if we're muting to change track or similar.
+ dac_->WriteVolume(volume);
+}
+
+auto DacAudioPlayback::volume() -> uint8_t {
+ return volume_;
+}
+
+} // namespace gay_ipod
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