75 lines
2.5 KiB
C++
75 lines
2.5 KiB
C++
#pragma once
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namespace mp3_utils
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{
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enum {
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MPG_MD_STEREO=0,
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MPG_MD_JOINT_STEREO=1,
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MPG_MD_DUAL_CHANNEL=2,
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MPG_MD_MONO=3,
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};
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typedef t_uint8 byte;
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enum {MPEG_1, MPEG_2, MPEG_25};
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struct TMPEGFrameInfo
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{
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unsigned m_bytes;
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unsigned m_bitrate_idx; // original bitrate index value
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unsigned m_bitrate; // kbps
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unsigned m_sample_rate_idx; // original samples per second index value
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unsigned m_sample_rate; // samples per second
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unsigned m_layer; // 1, 2 or 3
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unsigned m_mpegversion; // MPEG_1, MPEG_2, MPEG_25
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unsigned m_channels; // 1 or 2
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unsigned m_duration; // samples
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unsigned m_channel_mode; // MPG_MD_*
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unsigned m_channel_mode_ext;
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bool m_crc;
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};
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bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info,const t_uint8 p_header[4]);
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bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info, const void * bytes, size_t bytesAvail);
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bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize);
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bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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//! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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t_uint16 ExtractFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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//! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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t_uint16 CalculateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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//! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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void RecalculateFrameCRC(t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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unsigned QueryMPEGFrameSize(const t_uint8 p_header[4]);
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bool IsSameStream(TMPEGFrameInfo const & p_frame1,TMPEGFrameInfo const & p_frame2);
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};
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class mp3header
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{
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t_uint8 bytes[4];
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public:
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inline void copy(const mp3header & src) {memcpy(bytes,src.bytes,4);}
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inline void copy_raw(const void * src) {memcpy(bytes,src,4);}
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inline mp3header(const mp3header & src) {copy(src);}
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inline mp3header() {}
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inline const mp3header & operator=(const mp3header & src) {copy(src); return *this;}
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inline void get_bytes(void * out) {memcpy(out,bytes,4);}
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inline unsigned get_frame_size() const {return mp3_utils::QueryMPEGFrameSize(bytes);}
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inline bool decode(mp3_utils::TMPEGFrameInfo & p_out) {return mp3_utils::ParseMPEGFrameHeader(p_out,bytes);}
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unsigned get_samples_per_frame();
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};
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static inline mp3header mp3header_from_buffer(const void * p_buffer)
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{
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mp3header temp;
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temp.copy_raw(p_buffer);
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return temp;
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} |