56 lines
1.7 KiB
C++
56 lines
1.7 KiB
C++
#ifndef PACKAGER_MEDIA_FORMATS_MP2T_MPEG1_HEADER_H_
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#define PACKAGER_MEDIA_FORMATS_MP2T_MPEG1_HEADER_H_
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#include <cstdint>
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#include <vector>
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#include <packager/media/formats/mp2t/audio_header.h>
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namespace shaka {
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namespace media {
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namespace mp2t {
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/// Class which parses Mpeg1 audio frame (header / metadata) and synthesizes
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/// AudioSpecificConfig from audio frame content.
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///
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/// See https://www.datavoyage.com/mpgscript/mpeghdr.htm
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class Mpeg1Header : public AudioHeader {
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public:
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Mpeg1Header() = default;
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~Mpeg1Header() override = default;
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/// @name AudioHeader implementation overrides.
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/// @{
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bool IsSyncWord(const uint8_t* buf) const override;
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size_t GetMinFrameSize() const override;
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size_t GetSamplesPerFrame() const override;
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bool Parse(const uint8_t* mpeg1_frame, size_t mpeg1_frame_size) override;
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size_t GetHeaderSize() const override;
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size_t GetFrameSize() const override;
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size_t GetFrameSizeWithoutParsing(const uint8_t* data,
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size_t num_bytes) const override;
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void GetAudioSpecificConfig(std::vector<uint8_t>* buffer) const override;
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uint8_t GetObjectType() const override;
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uint32_t GetSamplingFrequency() const override;
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uint8_t GetNumChannels() const override;
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/// @}
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private:
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Mpeg1Header(const Mpeg1Header&) = delete;
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Mpeg1Header& operator=(const Mpeg1Header&) = delete;
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uint8_t version_ = 0;
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uint8_t layer_ = 0;
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uint8_t protection_absent_ = 0;
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uint32_t bitrate_ = 0;
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uint32_t sample_rate_ = 0; /* in hz */
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uint8_t padded_ = 0;
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uint8_t channel_mode_ = 0;
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};
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} // namespace mp2t
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} // namespace media
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} // namespace shaka
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#endif // PACKAGER_MEDIA_FORMATS_MP2T_MPEG1_HEADER_H_
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