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play_audio_stream(3) Allegro manual play_audio_stream(3) NAME play_audio_stream - Creates a new audio stream and starts playing it. Alle- gro game programming library. SYNOPSIS #include <allegro.h> AUDIOSTREAM *play_audio_stream(int len, int bits, int stereo, int freq, int vol, int pan); DESCRIPTION This function creates a new audio stream and starts playing it. The length is the size of each transfer buffer in sample frames (not bytes), where a sample frame is a single sample value for mono data or a pair of inter- leaved sample values (left first) for stereo data. The length should nor- mally be (but doesn't have to be) a power of 2 somewhere around 1k in size. Larger buffers are more efficient and require fewer updates, but result in more latency between you providing the data and it actually being played. The `bits' parameter must be 8 or 16. `freq' is the sample rate of the data in Hertz. The `vol' and `pan' values use the same 0-255 ranges as the regu- lar sample playing functions. The `stereo' parameter should be set to 1 for stereo streams, or 0 otherwise. If you want to adjust the pitch, volume, or panning of a stream once it is playing, you can use the regular voice_*() functions with stream->voice as a parameter. The format of the sample data is described in the SAMPLE entry of the "Structures and types defined by Allegro" chapter. The formula to get the size of the buffers in bytes could be: bytes = length * (bits / 8) * (stereo ? 2 : 1) Example: /* Create a 22KHz 8bit mono audio stream. */ stream = play_audio_stream(1024, 8, FALSE, 22050, 255, 128); if (!stream) abort_on_error("Error creating audio stream!\n"); RETURN VALUE This function returns a pointer to the audio stream or NULL if it could not be created. SEE ALSO install_sound(3), get_audio_stream_buffer(3), stop_audio_stream(3), AU- DIOSTREAM(3), exstream(3) Allegro version 4.4.3 play_audio_stream(3)
NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | SEE ALSO
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