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1 #pragma once
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2
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3 namespace mp3_utils
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4 {
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5
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6 enum {
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7 MPG_MD_STEREO=0,
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8 MPG_MD_JOINT_STEREO=1,
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9 MPG_MD_DUAL_CHANNEL=2,
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10 MPG_MD_MONO=3,
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11 };
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12
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13 typedef t_uint8 byte;
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14
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15 enum {MPEG_1, MPEG_2, MPEG_25};
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16
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17 struct TMPEGFrameInfo
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18 {
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19 unsigned m_bytes;
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20 unsigned m_bitrate_idx; // original bitrate index value
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21 unsigned m_bitrate; // kbps
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22 unsigned m_sample_rate_idx; // original samples per second index value
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23 unsigned m_sample_rate; // samples per second
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24 unsigned m_layer; // 1, 2 or 3
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25 unsigned m_mpegversion; // MPEG_1, MPEG_2, MPEG_25
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26 unsigned m_channels; // 1 or 2
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27 unsigned m_duration; // samples
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28 unsigned m_channel_mode; // MPG_MD_*
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29 unsigned m_channel_mode_ext;
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30 bool m_crc;
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31 };
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32
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33
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34 bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info,const t_uint8 p_header[4]);
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35 bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info, const void * bytes, size_t bytesAvail);
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36 bool IsValidMPEGFrameHeader(const void* fourbytes);
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37 bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize);
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38 bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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39
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40 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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41 t_uint16 ExtractFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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42 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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43 t_uint16 CalculateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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44 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
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45 void RecalculateFrameCRC(t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
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46
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47 unsigned QueryMPEGFrameSize(const t_uint8 p_header[4]);
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48 bool IsSameStream(TMPEGFrameInfo const & p_frame1,TMPEGFrameInfo const & p_frame2);
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49 };
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50
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51 class mp3header
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52 {
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53 t_uint8 bytes[4];
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54 public:
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55
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56 inline void copy(const mp3header & src) {memcpy(bytes,src.bytes,4);}
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57 inline void copy_raw(const void * src) {memcpy(bytes,src,4);}
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58
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59 inline void get_bytes(void * out) {memcpy(out,bytes,4);}
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60 inline unsigned get_frame_size() const {return mp3_utils::QueryMPEGFrameSize(bytes);}
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61 inline bool decode(mp3_utils::TMPEGFrameInfo & p_out) {return mp3_utils::ParseMPEGFrameHeader(p_out,bytes);}
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62
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63 unsigned get_samples_per_frame();
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64 };
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65
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66 static inline mp3header mp3header_from_buffer(const void * p_buffer)
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67 {
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68 mp3header temp;
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69 temp.copy_raw(p_buffer);
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70 return temp;
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71 } |
