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comparison foosdk/sdk/foobar2000/helpers/mp3_utils.h @ 1:20d02a178406 default tip

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author Paper <paper@tflc.us>
date Mon, 05 Jan 2026 02:15:46 -0500
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0:e9bb126753e7 1:20d02a178406
1 #pragma once
2
3 namespace mp3_utils
4 {
5
6 enum {
7 MPG_MD_STEREO=0,
8 MPG_MD_JOINT_STEREO=1,
9 MPG_MD_DUAL_CHANNEL=2,
10 MPG_MD_MONO=3,
11 };
12
13 typedef t_uint8 byte;
14
15 enum {MPEG_1, MPEG_2, MPEG_25};
16
17 struct TMPEGFrameInfo
18 {
19 unsigned m_bytes;
20 unsigned m_bitrate_idx; // original bitrate index value
21 unsigned m_bitrate; // kbps
22 unsigned m_sample_rate_idx; // original samples per second index value
23 unsigned m_sample_rate; // samples per second
24 unsigned m_layer; // 1, 2 or 3
25 unsigned m_mpegversion; // MPEG_1, MPEG_2, MPEG_25
26 unsigned m_channels; // 1 or 2
27 unsigned m_duration; // samples
28 unsigned m_channel_mode; // MPG_MD_*
29 unsigned m_channel_mode_ext;
30 bool m_crc;
31 };
32
33
34 bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info,const t_uint8 p_header[4]);
35 bool ParseMPEGFrameHeader(TMPEGFrameInfo & p_info, const void * bytes, size_t bytesAvail);
36 bool IsValidMPEGFrameHeader(const void* fourbytes);
37 bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize);
38 bool ValidateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
39
40 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
41 t_uint16 ExtractFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
42 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
43 t_uint16 CalculateFrameCRC(const t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
44 //! Assumes valid frame with CRC (frameInfo.m_crc set, frameInfo.m_bytes <= frameSize).
45 void RecalculateFrameCRC(t_uint8 * frameData, t_size frameSize, TMPEGFrameInfo const & frameInfo);
46
47 unsigned QueryMPEGFrameSize(const t_uint8 p_header[4]);
48 bool IsSameStream(TMPEGFrameInfo const & p_frame1,TMPEGFrameInfo const & p_frame2);
49 };
50
51 class mp3header
52 {
53 t_uint8 bytes[4];
54 public:
55
56 inline void copy(const mp3header & src) {memcpy(bytes,src.bytes,4);}
57 inline void copy_raw(const void * src) {memcpy(bytes,src,4);}
58
59 inline void get_bytes(void * out) {memcpy(out,bytes,4);}
60 inline unsigned get_frame_size() const {return mp3_utils::QueryMPEGFrameSize(bytes);}
61 inline bool decode(mp3_utils::TMPEGFrameInfo & p_out) {return mp3_utils::ParseMPEGFrameHeader(p_out,bytes);}
62
63 unsigned get_samples_per_frame();
64 };
65
66 static inline mp3header mp3header_from_buffer(const void * p_buffer)
67 {
68 mp3header temp;
69 temp.copy_raw(p_buffer);
70 return temp;
71 }