blob: aa83825f63618258a725dedf809e83c080ee4183 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
|
#pragma once
#include <cstddef>
#include <cstdint>
#include <memory>
#include "chunk.hpp"
#include "ff.h"
#include "span.hpp"
#include "audio_element.hpp"
#include "codec.hpp"
namespace audio {
/*
* An audio element that accepts various kinds of encoded audio streams as
* input, and converts them to uncompressed PCM output.
*/
class AudioDecoder : public IAudioElement {
public:
AudioDecoder();
~AudioDecoder();
auto StackSizeBytes() const -> std::size_t override { return 10 * 1024; };
auto InputMinChunkSize() const -> std::size_t override {
// 128 kbps MPEG-1 @ 44.1 kHz is approx. 418 bytes according to the
// internet.
// TODO(jacqueline): tune as more codecs are added.
return 1024;
}
auto HasUnprocessedInput() -> bool override;
auto ProcessStreamInfo(const StreamInfo& info)
-> cpp::result<void, AudioProcessingError> override;
auto ProcessChunk(const cpp::span<std::byte>& chunk)
-> cpp::result<std::size_t, AudioProcessingError> override;
auto ProcessEndOfStream() -> void override;
auto Process() -> cpp::result<void, AudioProcessingError> override;
AudioDecoder(const AudioDecoder&) = delete;
AudioDecoder& operator=(const AudioDecoder&) = delete;
private:
std::unique_ptr<codecs::ICodec> current_codec_;
std::optional<StreamInfo> stream_info_;
std::optional<ChunkReader> chunk_reader_;
bool has_sent_stream_info_;
std::size_t chunk_size_;
bool has_samples_to_send_;
bool needs_more_input_;
};
} // namespace audio
|
