comparison src/audio/alsa/SDL_alsa_audio.c @ 1982:3b4ce57c6215

First shot at new audio data types (int32 and float32). Notable changes: - Converters between types are autogenerated. Instead of making multiple passes over the data with seperate filters for endianess, size, signedness, etc, converting between data types is always one specialized filter. This simplifies SDL_BuildAudioCVT(), which otherwise had a million edge cases with the new types, and makes the actually conversions more CPU cache friendly. Left a stub for adding specific optimized versions of these routines (SSE/MMX/Altivec, assembler, etc) - Autogenerated converters are built by SDL/src/audio/sdlgenaudiocvt.pl. This does not need to be run unless tweaking the code, and thus doesn't need integration into the build system. - Went through all the drivers and tried to weed out all the "Uint16" references that are better specified with the new SDL_AudioFormat typedef. - Cleaned out a bunch of hardcoded bitwise magic numbers and replaced them with new SDL_AUDIO_* macros. - Added initial float32 and int32 support code. Theoretically, existing drivers will push these through converters to get the data they want to feed to the hardware. Still TODO: - Optimize and debug new converters. - Update the CoreAudio backend to accept float32 data directly. - Other backends, too? - SDL_LoadWAV() needs to be updated to support int32 and float32 .wav files (both of which exist and can be generated by 'sox' for testing purposes). - Update the mixer to handle new datatypes. - Optionally update SDL_sound and SDL_mixer, etc.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 24 Aug 2006 12:10:46 +0000
parents c121d94672cb
children 0ca6ba107642
comparison
equal deleted inserted replaced
1981:3f21778e7433 1982:3b4ce57c6215
481 int status; 481 int status;
482 snd_pcm_hw_params_t *hwparams; 482 snd_pcm_hw_params_t *hwparams;
483 snd_pcm_sw_params_t *swparams; 483 snd_pcm_sw_params_t *swparams;
484 snd_pcm_format_t format; 484 snd_pcm_format_t format;
485 snd_pcm_uframes_t frames; 485 snd_pcm_uframes_t frames;
486 Uint16 test_format; 486 SDL_AudioFormat test_format;
487 487
488 /* Open the audio device */ 488 /* Open the audio device */
489 /* Name of device should depend on # channels in spec */ 489 /* Name of device should depend on # channels in spec */
490 status = 490 status =
491 SDL_NAME(snd_pcm_open) (&pcm_handle, 491 SDL_NAME(snd_pcm_open) (&pcm_handle,