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audio_core: hle: mf: re-arrange comments

This commit is contained in:
liushuyu 2019-01-28 21:47:41 -07:00 committed by B3N30
parent 972b527374
commit 4bc6bfd51f
3 changed files with 19 additions and 12 deletions
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6
src/audio_core/hle/adts.h
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@ -17,6 +17,8 @@ struct ADTSData {
u32 samplerate;
};
u32 ParseADTS(char* buffer, struct ADTSData* out);
u32 ParseADTS(char* buffer, ADTSData* out);
// last two bytes of MF AAC decoder user data
u16 MFGetAACTag(struct ADTSData input);
// see https://docs.microsoft.com/en-us/windows/desktop/medfound/aac-decoder#example-media-types
u16 MFGetAACTag(ADTSData input);

10
src/audio_core/hle/adts_reader.cpp
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@ -7,7 +7,7 @@ constexpr std::array<u32, 16> freq_table = {96000, 88200, 64000, 48000, 44100, 3
16000, 12000, 11025, 8000, 7350, 0, 0, 0};
constexpr std::array<u8, 8> channel_table = {0, 1, 2, 3, 4, 5, 6, 8};
u32 ParseADTS(char* buffer, struct ADTSData* out) {
u32 ParseADTS(char* buffer, ADTSData* out) {
u32 tmp = 0;
// sync word 0xfff
@ -40,7 +40,13 @@ u32 ParseADTS(char* buffer, struct ADTSData* out) {
}
// last two bytes of MF AAC decoder user data
u16 MFGetAACTag(struct ADTSData input) {
// Audio object type (5 bits)
// Sample rate profile (4 bits)
// Channel configuration profile (4 bits)
// Frame length flag (1 bit)
// Depends on core coder (1 bit)
// Extension flag (1 bit)
u16 MFGetAACTag(ADTSData input) {
u16 tag = 0;
tag |= input.profile << 11;

15
src/audio_core/hle/wmf_decoder_utils.cpp
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@ -134,14 +134,6 @@ bool SelectInputMediaType(IMFTransform* transform, int in_stream_id, const ADTSD
t->SetGUID(MF_MT_MAJOR_TYPE, MFMediaType_Audio);
t->SetGUID(MF_MT_SUBTYPE, audio_format);
// see https://docs.microsoft.com/en-us/windows/desktop/medfound/aac-decoder#example-media-types
// and https://docs.microsoft.com/zh-cn/windows/desktop/api/mmreg/ns-mmreg-heaacwaveinfo_tag
// for the meaning of the byte array below
// for integrate into a larger project, it is recommended to wrap the parameters into a struct
// and pass that struct into the function
// const UINT8 aac_data[] = { 0x01, 0x00, 0xfe, 00, 00, 00, 00, 00, 00, 00, 00, 00, 0x11, 0x90
// }; 0: raw aac 1: adts 2: adif 3: latm/laos
t->SetUINT32(MF_MT_AAC_PAYLOAD_TYPE, 1);
t->SetUINT32(MF_MT_AUDIO_NUM_CHANNELS, adts.channels);
t->SetUINT32(MF_MT_AUDIO_SAMPLES_PER_SECOND, adts.samplerate);
@ -211,6 +203,13 @@ int DetectMediaType(char* buffer, size_t len, ADTSData* output, char** aac_tag)
}
ADTSData tmp;
// see https://docs.microsoft.com/en-us/windows/desktop/api/mmreg/ns-mmreg-heaacwaveinfo_tag
// for the meaning of the byte array below
// it might be a good idea to wrap the parameters into a struct
// and pass that struct into the function but this will lead to messier code
// const UINT8 aac_data[] = { 0x01, 0x00, 0xfe, 00, 00, 00, 00, 00, 00, 00, 00, 00, 0x11, 0x90
// }; first byte: 0: raw aac 1: adts 2: adif 3: latm/laos
UINT8 aac_tmp[] = {0x01, 0x00, 0xfe, 00, 00, 00, 00, 00, 00, 00, 00, 00, 0x00, 0x00};
uint16_t tag = 0;