Mercurial > sdl-ios-xcode

view src/audio/alsa/SDL_alsa_audio.h @ 4357:a10dac5858fe SDL-1.2

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Recommendation from Lennart Poettering: In ALSA_OpenAudio(): instead of setting period_size+n_periods OR buffer_size I'd recommend copying the hwparams stuff before you do this, then first try period_size+n_periods, and then apply it with snd_pcm_hw_params() and check if that works. If it didn't you should take the copy of hwparams and try setting buffer_size and apply that via snd_pcm_hw_params() and check if that worked. And if that failed too, then take the copy and don't apply neither period nor buffer settings and see if that works.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 19 Oct 2009 02:23:21 +0000
parents 464126f4c7db
children 4b582c04ec1d
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Library General Public
    License as published by the Free Software Foundation; either
    version 2 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Library General Public License for more details.

    You should have received a copy of the GNU Library General Public
    License along with this library; if not, write to the Free
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _ALSA_PCM_audio_h
#define _ALSA_PCM_audio_h

#include <alsa/asoundlib.h>

#include "../SDL_sysaudio.h"

/* Hidden "this" pointer for the video functions */
#define _THIS	SDL_AudioDevice *this

struct SDL_PrivateAudioData {
	/* The audio device handle */
	snd_pcm_t *pcm_handle;

	/* The parent process id, to detect when application quits */
	pid_t parent;

	/* Raw mixing buffer */
	Uint8 *mixbuf;
	int    mixlen;
};

/* Old variable names */
#define pcm_handle		(this->hidden->pcm_handle)
#define parent			(this->hidden->parent)
#define mixbuf			(this->hidden->mixbuf)
#define mixlen			(this->hidden->mixlen)

#endif /* _ALSA_PCM_audio_h */