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/*
* Copyright 2023 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "audio_decoder.hpp"
#include <string.h>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <memory>
#include <variant>
#include "codec.hpp"
#include "freertos/FreeRTOS.h"
#include "esp_heap_caps.h"
#include "esp_log.h"
#include "freertos/message_buffer.h"
#include "freertos/portmacro.h"
#include "audio_element.hpp"
#include "chunk.hpp"
#include "fatfs_audio_input.hpp"
#include "stream_info.hpp"
namespace audio {
static const char* kTag = "DEC";
AudioDecoder::AudioDecoder()
: IAudioElement(),
current_codec_(),
current_input_format_(),
current_output_format_(),
has_samples_to_send_(false),
has_input_remaining_(false) {}
AudioDecoder::~AudioDecoder() {}
auto AudioDecoder::ProcessStreamInfo(const StreamInfo& info) -> bool {
if (!std::holds_alternative<StreamInfo::Encoded>(info.format)) {
return false;
}
ESP_LOGI(kTag, "got new stream");
const auto& encoded = std::get<StreamInfo::Encoded>(info.format);
// Reuse the existing codec if we can. This will help with gapless playback,
// since we can potentially just continue to decode as we were before,
// without any setup overhead.
// TODO(jacqueline): Reconsider this. It makes a lot of things harder to smash
// streams together at this layer.
/*
if (current_codec_ != nullptr && current_input_format_) {
auto cur_encoding = std::get<StreamInfo::Encoded>(*current_input_format_);
if (cur_encoding.type == encoded.type) {
ESP_LOGI(kTag, "reusing existing decoder");
current_input_format_ = info.format;
return true;
}
}
*/
current_input_format_ = info.format;
ESP_LOGI(kTag, "creating new decoder");
auto result = codecs::CreateCodecForType(encoded.type);
if (result.has_value()) {
current_codec_.reset(result.value());
} else {
ESP_LOGE(kTag, "no codec for this file");
return false;
}
return true;
}
auto AudioDecoder::NeedsToProcess() const -> bool {
return has_samples_to_send_ || has_input_remaining_;
}
auto AudioDecoder::Process(const std::vector<InputStream>& inputs,
OutputStream* output) -> void {
auto input = inputs.begin();
const StreamInfo& info = input->info();
// Check the input stream's format has changed (or, by extension, if this is
// the first stream).
if (!current_input_format_ || *current_input_format_ != info.format) {
ESP_LOGI(kTag, "beginning new stream");
has_samples_to_send_ = false;
ProcessStreamInfo(info);
auto res = current_codec_->BeginStream(input->data());
input->consume(res.first);
if (res.second.has_error()) {
// TODO(jacqueline): Handle errors.
return;
}
// The stream started successfully. Record what format the samples are in.
codecs::ICodec::OutputFormat format = res.second.value();
current_output_format_ = StreamInfo::Pcm{
.channels = format.num_channels,
.bits_per_sample = format.bits_per_sample,
.sample_rate = format.sample_rate_hz,
};
if (info.seek_to_seconds) {
seek_to_sample_ = *info.seek_to_seconds * format.sample_rate_hz;
} else {
seek_to_sample_.reset();
}
}
while (seek_to_sample_) {
ESP_LOGI(kTag, "seeking forwards...");
auto res = current_codec_->SeekStream(input->data(), *seek_to_sample_);
input->consume(res.first);
if (res.second.has_error()) {
auto err = res.second.error();
if (err == codecs::ICodec::Error::kOutOfInput) {
return;
} else {
// TODO(jacqueline): Handle errors.
seek_to_sample_.reset();
}
} else {
seek_to_sample_.reset();
}
}
has_input_remaining_ = true;
while (true) {
// TODO(jacqueline): Pass through seek info here?
if (!output->prepare(*current_output_format_)) {
ESP_LOGI(kTag, "waiting for buffer to become free");
break;
}
auto res = current_codec_->ContinueStream(input->data(), output->data());
input->consume(res.first);
if (res.second.has_error()) {
if (res.second.error() == codecs::ICodec::Error::kOutOfInput) {
ESP_LOGW(kTag, "out of input");
ESP_LOGW(kTag, "(%u bytes left)", input->data().size_bytes());
has_input_remaining_ = false;
// We can't be halfway through sending samples if the codec is asking
// for more input.
has_samples_to_send_ = false;
input->mark_incomplete();
} else {
// TODO(jacqueline): Handle errors.
ESP_LOGE(kTag, "codec return fatal error");
}
return;
}
ESP_LOGI(kTag, "enc read: %u", res.first);
codecs::ICodec::OutputInfo out_info = res.second.value();
output->add(out_info.bytes_written);
has_samples_to_send_ = !out_info.is_finished_writing;
ESP_LOGI(kTag, "enc wrote: %u", out_info.bytes_written);
if (out_info.is_finished_writing) {
ESP_LOGI(kTag, "(write finished)");
}
if (has_samples_to_send_) {
// We weren't able to fit all the generated samples into the output
// buffer. Stop trying; we'll finish up during the next pass.
break;
}
}
}
} // namespace audio
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