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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_prepared_output_(false),
has_samples_to_send_(false),
has_input_remaining_(false) {}
AudioDecoder::~AudioDecoder() {}
auto AudioDecoder::ProcessStreamInfo(const StreamInfo& info) -> bool {
has_prepared_output_ = false;
current_codec_.reset();
current_input_format_.reset();
current_output_format_.reset();
if (!std::holds_alternative<StreamInfo::Encoded>(info.format)) {
return false;
}
const auto& new_format = std::get<StreamInfo::Encoded>(info.format);
current_input_format_ = new_format;
ESP_LOGI(kTag, "creating new decoder");
auto result = codecs::CreateCodecForType(new_format.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();
// Is this a completely new stream?
if (!current_input_format_) {
if (!ProcessStreamInfo(info)) {
// We couldn't handle the new stream. Signal to the producer that we don't
// have anything to do.
input->mark_consumer_finished();
return;
}
}
// Have we determined what kind of samples this stream decodes to?
if (!current_output_format_) {
auto res = current_codec_->BeginStream(input->data());
input->consume(res.first);
if (res.second.has_error()) {
auto err = res.second.error();
if (err == codecs::ICodec::Error::kOutOfInput) {
// We didn't manage to clear whatever front matter is before this
// stream's header. We need to call BeginStream again with more data.
return;
}
// Somthing about the stream's header was malformed. Skip it.
ESP_LOGE(kTag, "error beginning stream");
input->mark_consumer_finished();
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 (format.duration_seconds) {
duration_seconds_from_decoder_ = format.duration_seconds;
} else if (format.bits_per_second &&
current_input_format_->duration_bytes) {
duration_seconds_from_decoder_ =
(current_input_format_->duration_bytes.value() - res.first) * 8 /
format.bits_per_second.value() / format.num_channels;
}
if (info.seek_to_seconds) {
seek_to_sample_ = *info.seek_to_seconds * format.sample_rate_hz;
} else {
seek_to_sample_.reset();
}
}
if (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();
}
has_input_remaining_ = true;
while (true) {
// Make sure the output buffer is ready to receive samples in our format
// before starting to process data.
// TODO(jacqueline): Pass through seek info here?
if (!has_prepared_output_ && !output->prepare(*current_output_format_)) {
return;
}
if (duration_seconds_from_decoder_) {
output->set_duration(*duration_seconds_from_decoder_);
}
has_prepared_output_ = true;
// Parse frames and produce samples.
auto res = current_codec_->ContinueStream(input->data(), output->data());
input->consume(res.first);
// Handle any errors during processing.
if (res.second.has_error()) {
// The codec ran out of input during processing. This is expected to
// happen throughout the stream.
if (res.second.error() == codecs::ICodec::Error::kOutOfInput) {
has_input_remaining_ = false;
has_samples_to_send_ = false;
if (input->is_producer_finished()) {
// We're out of data, and so is the producer. Nothing left to be done
// with the input stream.
input->mark_consumer_finished();
// Upstream isn't going to give us any more data. Tell downstream
// that they shouldn't expact any more samples from this stream.
output->mark_producer_finished();
break;
}
} else {
// TODO(jacqueline): Handle errors.
ESP_LOGE(kTag, "codec returned fatal error");
}
// Note that a codec that returns an error is not allowed to write
// samples. So it's safe to skip the latter part of the loop.
return;
} else {
// Some samples were written! Ensure the downstream element knows about
// them.
codecs::ICodec::OutputInfo out_info = res.second.value();
output->add(out_info.bytes_written);
has_samples_to_send_ = !out_info.is_finished_writing;
if (has_samples_to_send_) {
// The codec wasn't able to finish writing all of its samples into the
// output buffer. We need to return so that we can get a new buffer.
return;
}
}
}
current_codec_.reset();
current_input_format_.reset();
}
} // namespace audio
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