Presentation is loading. Please wait.

Presentation is loading. Please wait.

2015/11/141 Audio I/O Speaker : Wei-Shin Pan DATE : 2009.11.19.

Published byKelley Horton Modified over 8 years ago

Similar presentations

Presentation on theme: "2015/11/141 Audio I/O Speaker : Wei-Shin Pan DATE : 2009.11.19."— Presentation transcript:

1 2015/11/141 Audio I/O Speaker : Wei-Shin Pan DATE : 2009.11.19

2 2015/11/142 Outline Multimedia API (Input) Media file saving Wave file format Demo (Record and save) Multimedia API (Output) Demo (Play media file)

3 2015/11/143 MultiMedia API (Input)

4 Sampling http://en.wikipedia.org/wiki/File:Sampled.signal.svg

5 Quantization http://en.wikipedia.org/wiki/File:Quantized.signal.svg

6 Digital singal http://en.wikipedia.org/wiki/File:Digital.signal.svg

7 2015/11/147 WAVEFORMATEX It defines the format of waveform-audio data. typedef struct { WORD wFormatTag; WORD nChannels; DWORD nSamplesPerSec; DWORD nAvgBytesPerSec; WORD nBlockAlign; WORD wBitsPerSample; WORD cbSize; } WAVEFORMATEX;

8 2015/11/148 WAVEHDR It defines the header used to identify a waveform-audio buffer. typedef struct wavehdr { LPSTR lpData; DWORD dwBufferLength; DWORD dwBytesRecorded; DWORD_PTR dwUser; DWORD dwFlags; DWORD dwLoops; struct wavehdr_tag * lpNext; DWORD_PTR reserved; } WAVEHDR, *LPWAVEHDR;

9 2015/11/149 waveInOpen() Open the given waveform-audio input device for recording. MMRESULT waveInOpen( LPHWAVEIN phwi, UINT_PTR uDeviceID, LPWAVEFORMATEX pwfx, DWORD_PTR dwCallback, DWORD_PTR dwCallbackInstance, DWORD fdwOpen );

10 2015/11/1410 waveInprepareHeader() It prepares a buffer for waveform input. MMRESULT waveInPrepareHeader( HWAVEIN hwi, LPWAVEHDR pwh, UINT cbwh );

11 2015/11/1411 waveInAddBuffer() Sends an input buffer to the specified waveform-audio input device. MMRESULT waveInAddBuffer( HWAVEIN hwi, LPWAVEHDR pwh, UINT cbwh );

12 2015/11/1412 waveInStart() Start input on the specified waveform input device. MMRESULT waveInStart( HWAVEIN hwi );

13 2015/11/1413 waveInReset() Stop input on the given waveform- audio input device and resets the current position to zero. MMRESULT waveInReset( HWAVEIN hwi );

14 2015/11/1414 waveInUnprepareheader() Clean up the preparation performed by waveInPrepareHeader. MMRESULT waveInUnprepareHeader( HWAVEIN hwi, LPWAVEHDR pwh, UINT cbwh );

15 2015/11/1415 waveInClose() Close the specified waveform-audio input device. MMRESULT waveInClose( HWAVEIN hwi );

16 2015/11/1416 Process of recording waveInOpen() -> waveInPrepareHeader() - > waveInAddBuffer() -> waveInStart() -> waveInStop() -> waveInUnprepareHeader -> waveInClose() Send voice stream by oRTP

17 2015/11/1417 Wave file format RIFF (Resource Interchange File Format) RIFF file = One Header (id,size,form type) + Subchunks (id,size,data) WAV 、 AVI files…etc

18 2015/11/1418 Wave file format http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/

19 2015/11/1419 RIFF chunk spec. ChunkID (4 bytes) // "RIFF" ChunkSize (4 bytes) Format (4 bytes) // "WAVE"

20 2015/11/1420 Fmt chunk spec. Subchunk1ID (4 bytes) ex: 'fmt '(+ space) Subchunk1Size (4 bytes) ex: 16 or 18 AudioFormat (2 bytes) ex: PCM = 1 (0x0001) NumChannels (2 bytes) ex: 1-mono 2-Stereo SampleRate (4 bytes) ex: 8000 ~ 44100 ByteRate (4 bytes) ex: SampleRate * NumChannels * BitsPerSample/8 BlockAlign (2 bytes) ex: == NumChannels * BitsPerSample/8 BitPerSample (2 bytes) ex: 8 bits = 8, 16bits...etc (optional) ExtraparamSize (2 bytes) (if dump file in hex mode : 00 00) 若是 PCM ，則沒有額外資料 ! (x) ExtraParams ! X bytes

21 2015/11/1421 Data chunk spec. subchunk2 ID (4 bytes) // 'data' subchunk2 Size (4 bytes) // == NumSamples * NumChannels * BitsPerSample/8 Data ( * bytes )

22 2015/11/1422 MMCKINFO The structure contains information about a chunk in a RIFF file. typedef struct { FOURCC ckid; DWORD cksize; FOURCC fccType; DWORD dwDataOffset; DWORD dwFlags; } MMCKINFO;

23 2015/11/1423 mmioFOURCC() The mmioFOURCC macro converts four characters into a four-character code. FOURCC mmioFOURCC( CHAR ch0, CHAR ch1, CHAR ch2, CHAR ch3 ); It returns the four-character code created from the given characters.

24 2015/11/1424 mmioOpen() Open a file. HMMIO mmioOpen( LPSTR Filename, MMIOINFO mmioinfo, DWORD dwOpenFlags ); Returns a handle of the opened file. If the file cannot be opened, the return value is NULL. dwOpenFlags :MMIO_CREATE 、 MMIO_WRITE 、 MMIO_READ …etc.

25 2015/11/1425 mmioCreateChunk() Creates a chunk in a RIFFfile that was opened,and the current file position is the beginning of the data portion of the new chunk. MMRESULT mmioCreateChunk( HMMIO hmmio, MMCKINFO &ck, UINT wFlags ); wFlags : MMIO_CREATERIFF 、 MMIO_CREATELIST It returns MMSYSERR_NOERROR if successful

26 2015/11/1426 mmioWrite() Writes a specified number of bytes to a file opened. LONG mmioWrite( HMMIO hmmio, char * pch, LONG cch ); Returns the number of bytes actually written. If it’s an error, return -1.

27 2015/11/1427 mmioAscend() Ascends out of a chunk in a RIFF file, and the current file position is the location following the end of the chunk MMRESULT mmioAscend( HMMIO hmmio, MMCKINFO &ck, UINT wFlags ); wFlags : must be zero. It returns MMSYSERR_NOERROR if successful or an error otherwise.

28 2015/11/1428 mmioClose() closes a file that was opened by using the mmioOpen() function. MMRESULT mmioClose( HMMIO hmmio, UINT wFlags ); It returns zero if successful or an error otherwise.

29 2015/11/1429 Process of saving file If the chunk is “ RIFF ” then mmioOpen() -> mmioFOURCC() -> mmioCreateChunk() -> mmioAscend() Fmt & data chunk mmioOpen() -> mmioFOURCC() -> mmioCreateChunk() -> mmiowrite ->mmioAscend() -> mmioClose()

30 2015/11/1430 Demo & dump file 52 49 46 46 24 08 00 00 57 41 56 45 66 6d 74 20 10 00 00 00 01 00 02 00 22 56 00 00 88 58 01 00 04 00 10 00 64 61 74 61 00 08 00 00 00 00 00 00 24 17 1e f3 3c 13 3c 14 16 f9 18 f9 34 e7 23 a6 3c f2 24 f2 11 ce 1a 0d (Sample shown in hex number) http://ccrma.stanford.edu/CCRMA/Courses/422/projects/WaveFormat/

31 2015/11/1431 MultiMeadia API(Output)

32 2015/11/1432 waveOutOpen() Open a specified waveform output device for playback. MMRESULT waveOutOpen( LPHWAVEOUT phwo, UINT uDeviceID, LPWAVEFORMATEX pwfx, DWORD dwCallback, DWORD dwInstance, DWORD fdwOpen ); It Returns MMSYSERR_NOERROR if successful.

33 2015/11/1433 waveOutPrepareHeader() Prepare a waveform data block for playback. MMRESULT waveOutPrepareHeader( HWAVEOUT hwo, LPWAVEHDR pwh, UINT cbwh ); It returns MMSYSERR_NOERROR if successful.

34 2015/11/1434 waveOutWrite() Send a data block to the specified waveform output device. MMRESULT waveOutWrite( HWAVEOUT hwo, LPWAVEHDR pwh, UINT cbwh ); It returns MMSYSERR_NOERROR if successful.

35 2015/11/1435 waveOutReset() Stop playback on a specified waveform output device and resets the current position to 0. MMRESULT waveOutReset( HWAVEOUT hwo ); It returns MMSYSERR_NOERROR if successful.

36 2015/11/1436 waveOutUnprepareHeader() Clean up the preparation performed by waveOutPrepareHeader. MMRESULT waveOutUnprepareHeader( HWAVEO UT hwo, LPWAVEHDR pwh, UINT cbwh ); It returns MMSYSERR_NOERROR if successful.

37 2015/11/1437 waveOutClose( ) Close the specified waveform output device. MMRESULT waveOutClose( HWAVEOUT hwo ); It returns MMSYSERR_NOERROR if successful.

38 2015/11/1438 mmioDescend() Descends into a chunk of a RIFF file that was opened. It can also search for a given chunk. MMRESULT mmioDescend( HMMIO hmmio, MMCKINFO lpck, MMCKINFO lpckParent, UINT wFlags ); wFlags: MMIO_FINDCHUNK 、 MMIO_FINDRIFF Return MMSYSERR_NOERROR if successful If the chunk is not founded, return MMIOERR_CHUNKNOTFOUND.

39 2015/11/1439 mmioRead() reads a specified number of bytes from a file opened by using the mmioOpen function. LONG mmioRead( HMMIO hmmio, HPSTR pch, LONG cch ); Return the number of bytes actually read. If there is an error, then return value -1.

40 2015/11/1440 Process of playing file If the chunk is RIFF chunk then mmioOpen() -> mmioDescend() Fmt & data chunk mmioOpen() -> mmioDescend() -> mmioRead() -> mmioAscend -> mmioClose() waveOutOpen() ->waveOutPrepareHeader()-> waveOutWrite()->waveOutPause()-> waveOutUnprepareHeader()-> waveOutClose()

41 2015/11/1441 Demo (play file) Environment windows XP Visual studio 2005 WaveIN, WaveOUT, WAV

42 2015/11/1442 Reference http://ms11.voip.edu.tw/~weishin/capture.rar (ALLinONE) http://ms11.voip.edu.tw/~weishin/capture.rar http://ms11.voip.edu.tw/~beautidays/program/waveout.t xt (WAVEOUT) http://ms11.voip.edu.tw/~beautidays/program/waveout.t xt http://ms11.voip.edu.tw/~beautidays/program/recording makingwave.txt (WAVEIN + SAVE) http://ms11.voip.edu.tw/~beautidays/program/recording makingwave.txt http://ccrma.stanford.edu/CCRMA/Courses/422/projects/ WaveFormat/ http://ccrma.stanford.edu/CCRMA/Courses/422/projects/ WaveFormat/ http://ms11.voip.edu.tw/~beautidays/mydocument/20061 113_ChingChen_MultimediaFileIO.ppt ( 兢真學姐的簡報 ) http://ms11.voip.edu.tw/~beautidays/mydocument/20061 113_ChingChen_MultimediaFileIO.ppt http://msdn.microsoft.com/ ( msdn ) http://msdn.microsoft.com/

Download ppt "2015/11/141 Audio I/O Speaker : Wei-Shin Pan DATE : 2009.11.19."

Similar presentations

Sampled Audio. We store digitised audio samples. This is the main audio data. In a file (e.g..wav format) we also need some header information. We will.

Sampled Audio. We store digitised audio samples. This is the main audio data. In a file (e.g..wav format) we also need some header information. We will.
A Phonetician ’ s Guide to Audio Formats Chilin Shih University of Illinois at Urbana Champaign LSA 2006January 5-8, 2006.

A Phonetician ’ s Guide to Audio Formats Chilin Shih University of Illinois at Urbana Champaign LSA 2006January 5-8, 2006.
                      Digital Audio 1.

                      Digital Audio 1.
A stereo audio file 1. Audio Channels Number of audio channels determines number of waveforms in a recording Two relevant types of recording Stereo recording.

A stereo audio file 1. Audio Channels Number of audio channels determines number of waveforms in a recording Two relevant types of recording Stereo recording.
Sound in multimedia How many of you like the use of audio in The Universal Machine? What about The Universal Computer? Why or why not? Does your preference.

Sound in multimedia How many of you like the use of audio in The Universal Machine? What about The Universal Computer? Why or why not? Does your preference.
4.1Different Audio Attributes 4.2Common Audio File Formats 4.3Balancing between File Size and Audio Quality 4.4Making Audio Elements Fit Our Needs.

4.1Different Audio Attributes 4.2Common Audio File Formats 4.3Balancing between File Size and Audio Quality 4.4Making Audio Elements Fit Our Needs.
1. Digitization of Sound What is Sound? Sound is a wave phenomenon like light, but is macroscopic and involves molecules of air being compressed and expanded.

1. Digitization of Sound What is Sound? Sound is a wave phenomenon like light, but is macroscopic and involves molecules of air being compressed and expanded.
Audio 2 Subject:T0934 / Multimedia Programming Foundation Session:9 Tahun:2009 Versi:1/0.

Audio 2 Subject:T0934 / Multimedia Programming Foundation Session:9 Tahun:2009 Versi:1/0.
1 Audio input and output Speaker: Ching Chen Chang Date:2006.10.30.

1 Audio input and output Speaker: Ching Chen Chang Date:
WaveIO Speaker: Paul Date:2013.08.07 1. Outline Wave File Format Multi-Media API (Output) Damo Multi-Media API (Input) Damo Reference 2.

WaveIO Speaker: Paul Date: Outline Wave File Format Multi-Media API (Output) Damo Multi-Media API (Input) Damo Reference 2.
Technology ICT Option: Audio.

Technology ICT Option: Audio.
SWE 423: Multimedia Systems Chapter 3: Audio Technology (2)

SWE 423: Multimedia Systems Chapter 3: Audio Technology (2)
Image and Sound Editing Raed S. Rasheed 2012. Digital Sound Digital sound types – Monophonic sound – Stereophonic sound – Quadraphonic sound – Surround.

Image and Sound Editing Raed S. Rasheed Digital Sound Digital sound types – Monophonic sound – Stereophonic sound – Quadraphonic sound – Surround.
Image and Sound Editing Raed S. Rasheed 2012. Sound What is sound? How is sound recorded? How is sound recorded digitally ? How does audio get digitized.

Image and Sound Editing Raed S. Rasheed Sound What is sound? How is sound recorded? How is sound recorded digitally ? How does audio get digitized.
CSCI 3280 Tutorial 3 Project （C++）

CSCI 3280 Tutorial 3 Project （C++）
1 Digital Audio Storage Formats. 2 Formats  There are many different formats for storing and communicating digital audio:  CD audio  Wav  Aiff  Au.

1 Digital Audio Storage Formats. 2 Formats  There are many different formats for storing and communicating digital audio:  CD audio  Wav  Aiff  Au.
Web siteWeb site ExamplesExamples 1 Mode of Operation Protected mode  4 GB  32-bit address  Windows, Linux Real-address mode  1 MB space  20-bit address.

Web siteWeb site ExamplesExamples 1 Mode of Operation Protected mode  4 GB  32-bit address  Windows, Linux Real-address mode  1 MB space  20-bit address.
Java Audio.

Java Audio.
Using ‘random’ numbers Some ways the standard UNIX ‘rand()’ library-function can be deployed to generate graphics and sound.

Using ‘random’ numbers Some ways the standard UNIX ‘rand()’ library-function can be deployed to generate graphics and sound.
Project 1 Speech Detection Due: Sunday, February 1 st, 11:59pm.

Project 1 Speech Detection Due: Sunday, February 1 st, 11:59pm.

Similar presentations

Ads by Google