19682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 29682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL - Simple DirectMedia Layer 39682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Copyright (C) 1997-2012 Sam Lantinga 49682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 59682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is free software; you can redistribute it and/or 69682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall modify it under the terms of the GNU Library General Public 79682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License as published by the Free Software Foundation; either 89682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall version 2 of the License, or (at your option) any later version. 99682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall This library is distributed in the hope that it will be useful, 119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall but WITHOUT ANY WARRANTY; without even the implied warranty of 129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Library General Public License for more details. 149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall You should have received a copy of the GNU Library General Public 169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall License along with this library; if not, write to the Free 179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Sam Lantinga 209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall slouken@libsdl.org 219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_config.h" 239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Allow access to a raw mixing buffer */ 259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <sys/types.h> 279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include <signal.h> /* For kill() */ 289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_timer.h" 309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_audio.h" 319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audiomem.h" 329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "../SDL_audio_c.h" 339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_alsa_audio.h" 349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC 369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_name.h" 379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#include "SDL_loadso.h" 389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define SDL_NAME(X) X 409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif 419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* The tag name used by ALSA audio */ 449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define DRIVER_NAME "alsa" 459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver functions */ 479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec); 489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_WaitAudio(_THIS); 499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_PlayAudio(_THIS); 509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *ALSA_GetAudioBuf(_THIS); 519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_CloseAudio(_THIS); 529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#ifdef SDL_AUDIO_DRIVER_ALSA_DYNAMIC 549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic const char *alsa_library = SDL_AUDIO_DRIVER_ALSA_DYNAMIC; 569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void *alsa_handle = NULL; 579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int alsa_loaded = 0; 589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_open))(snd_pcm_t **pcm, const char *name, snd_pcm_stream_t stream, int mode); 609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_close))(snd_pcm_t *pcm); 619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic snd_pcm_sframes_t (*SDL_NAME(snd_pcm_writei))(snd_pcm_t *pcm, const void *buffer, snd_pcm_uframes_t size); 629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_recover))(snd_pcm_t *pcm, int err, int silent); 639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_prepare))(snd_pcm_t *pcm); 649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_drain))(snd_pcm_t *pcm); 659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic const char *(*SDL_NAME(snd_strerror))(int errnum); 669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic size_t (*SDL_NAME(snd_pcm_hw_params_sizeof))(void); 679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic size_t (*SDL_NAME(snd_pcm_sw_params_sizeof))(void); 689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void (*SDL_NAME(snd_pcm_hw_params_copy))(snd_pcm_hw_params_t *dst, const snd_pcm_hw_params_t *src); 699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_any))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); 709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_access))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_access_t access); 719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_format))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_format_t val); 729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_channels))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int val); 739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_get_channels))(const snd_pcm_hw_params_t *params, unsigned int *val); 749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_rate_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir); 759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_period_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val, int *dir); 769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_get_period_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *frames, int *dir); 779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_periods_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, unsigned int *val, int *dir); 789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_get_periods))(const snd_pcm_hw_params_t *params, unsigned int *val, int *dir); 799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_set_buffer_size_near))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val); 809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params_get_buffer_size))(const snd_pcm_hw_params_t *params, snd_pcm_uframes_t *val); 819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_hw_params))(snd_pcm_t *pcm, snd_pcm_hw_params_t *params); 829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall*/ 849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_sw_params_set_avail_min))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams, snd_pcm_uframes_t val); 859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_sw_params_current))(snd_pcm_t *pcm, snd_pcm_sw_params_t *swparams); 869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_sw_params_set_start_threshold))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params, snd_pcm_uframes_t val); 879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_sw_params))(snd_pcm_t *pcm, snd_pcm_sw_params_t *params); 889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_nonblock))(snd_pcm_t *pcm, int nonblock); 899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int (*SDL_NAME(snd_pcm_wait))(snd_pcm_t *pcm, int timeout); 909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define snd_pcm_hw_params_sizeof SDL_NAME(snd_pcm_hw_params_sizeof) 919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define snd_pcm_sw_params_sizeof SDL_NAME(snd_pcm_sw_params_sizeof) 929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* cast funcs to char* first, to please GCC's strict aliasing rules. */ 949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic struct { 959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const char *name; 969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall void **func; 979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} alsa_functions[] = { 989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_open", (void**)(char*)&SDL_NAME(snd_pcm_open) }, 999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_close", (void**)(char*)&SDL_NAME(snd_pcm_close) }, 1009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_writei", (void**)(char*)&SDL_NAME(snd_pcm_writei) }, 1019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_recover", (void**)(char*)&SDL_NAME(snd_pcm_recover) }, 1029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_prepare", (void**)(char*)&SDL_NAME(snd_pcm_prepare) }, 1039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_drain", (void**)(char*)&SDL_NAME(snd_pcm_drain) }, 1049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_strerror", (void**)(char*)&SDL_NAME(snd_strerror) }, 1059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_sizeof) }, 1069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_sw_params_sizeof", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_sizeof) }, 1079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_copy", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_copy) }, 1089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_any", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_any) }, 1099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_access", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_access) }, 1109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_format", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_format) }, 1119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_channels) }, 1129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_get_channels", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_channels) }, 1139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_rate_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_rate_near) }, 1149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_period_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_period_size_near) }, 1159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_get_period_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_period_size) }, 1169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_periods_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_periods_near) }, 1179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_get_periods", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_periods) }, 1189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_set_buffer_size_near", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_set_buffer_size_near) }, 1199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params_get_buffer_size", (void**)(char*)&SDL_NAME(snd_pcm_hw_params_get_buffer_size) }, 1209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_hw_params", (void**)(char*)&SDL_NAME(snd_pcm_hw_params) }, 1219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_sw_params_set_avail_min", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_avail_min) }, 1229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_sw_params_current", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_current) }, 1239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_sw_params_set_start_threshold", (void**)(char*)&SDL_NAME(snd_pcm_sw_params_set_start_threshold) }, 1249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_sw_params", (void**)(char*)&SDL_NAME(snd_pcm_sw_params) }, 1259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_nonblock", (void**)(char*)&SDL_NAME(snd_pcm_nonblock) }, 1269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall { "snd_pcm_wait", (void**)(char*)&SDL_NAME(snd_pcm_wait) }, 1279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 1289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void UnloadALSALibrary(void) { 1309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (alsa_loaded) { 1319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_UnloadObject(alsa_handle); 1329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall alsa_handle = NULL; 1339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall alsa_loaded = 0; 1349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int LoadALSALibrary(void) { 1389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int i, retval = -1; 1399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall alsa_handle = SDL_LoadObject(alsa_library); 1419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (alsa_handle) { 1429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall alsa_loaded = 1; 1439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = 0; 1449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for (i = 0; i < SDL_arraysize(alsa_functions); i++) { 1459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall *alsa_functions[i].func = SDL_LoadFunction(alsa_handle,alsa_functions[i].name); 1469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (!*alsa_functions[i].func) { 1479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall retval = -1; 1489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadALSALibrary(); 1499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return retval; 1549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#else 1579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void UnloadALSALibrary(void) { 1599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return; 1609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int LoadALSALibrary(void) { 1639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return 0; 1649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#endif /* SDL_AUDIO_DRIVER_ALSA_DYNAMIC */ 1679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic const char *get_audio_device(int channels) 1699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const char *device; 1719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall device = SDL_getenv("AUDIODEV"); /* Is there a standard variable name? */ 1739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( device == NULL ) { 1749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch (channels) { 1759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 6: 1769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall device = "plug:surround51"; 1779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case 4: 1799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall device = "plug:surround40"; 1809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: 1829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall device = "default"; 1839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 1849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 1869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return device; 1879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 1889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* Audio driver bootstrap functions */ 1909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int Audio_Available(void) 1929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 1939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int available; 1949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 1959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_t *handle; 1969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 1979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall available = 0; 1989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (LoadALSALibrary() < 0) { 1999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return available; 2009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_open)(&handle, get_audio_device(2), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); 2029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status >= 0 ) { 2039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall available = 1; 2049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_close)(handle); 2059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadALSALibrary(); 2079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(available); 2089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void Audio_DeleteDevice(SDL_AudioDevice *device) 2119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device->hidden); 2139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(device); 2149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall UnloadALSALibrary(); 2159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic SDL_AudioDevice *Audio_CreateDevice(int devindex) 2189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_AudioDevice *this; 2209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Initialize all variables that we clean on shutdown */ 2229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall LoadALSALibrary(); 2239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this = (SDL_AudioDevice *)SDL_malloc(sizeof(SDL_AudioDevice)); 2249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 2259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this, 0, (sizeof *this)); 2269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->hidden = (struct SDL_PrivateAudioData *) 2279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_malloc((sizeof *this->hidden)); 2289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( (this == NULL) || (this->hidden == NULL) ) { 2309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_OutOfMemory(); 2319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( this ) { 2329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_free(this); 2339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 2359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(this->hidden, 0, (sizeof *this->hidden)); 2379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the function pointers */ 2399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->OpenAudio = ALSA_OpenAudio; 2409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->WaitAudio = ALSA_WaitAudio; 2419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->PlayAudio = ALSA_PlayAudio; 2429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->GetAudioBuf = ALSA_GetAudioBuf; 2439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->CloseAudio = ALSA_CloseAudio; 2449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->free = Audio_DeleteDevice; 2469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return this; 2489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse HallAudioBootStrap ALSA_bootstrap = { 2519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall DRIVER_NAME, "ALSA PCM audio", 2529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Audio_Available, Audio_CreateDevice 2539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall}; 2549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* This function waits until it is possible to write a full sound buffer */ 2569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_WaitAudio(_THIS) 2579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* We're in blocking mode, so there's nothing to do here */ 2599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 2609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 2639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall * http://bugzilla.libsdl.org/show_bug.cgi?id=110 2649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall * "For Linux ALSA, this is FL-FR-RL-RR-C-LFE 2659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall * and for Windows DirectX [and CoreAudio], this is FL-FR-C-LFE-RL-RR" 2669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 2679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#define SWIZ6(T) \ 2689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall T *ptr = (T *) mixbuf; \ 2699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint32 i; \ 2709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for (i = 0; i < this->spec.samples; i++, ptr += 6) { \ 2719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall T tmp; \ 2729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall tmp = ptr[2]; ptr[2] = ptr[4]; ptr[4] = tmp; \ 2739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall tmp = ptr[3]; ptr[3] = ptr[5]; ptr[5] = tmp; \ 2749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 2759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic __inline__ void swizzle_alsa_channels_6_64bit(_THIS) { SWIZ6(Uint64); } 2779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic __inline__ void swizzle_alsa_channels_6_32bit(_THIS) { SWIZ6(Uint32); } 2789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic __inline__ void swizzle_alsa_channels_6_16bit(_THIS) { SWIZ6(Uint16); } 2799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic __inline__ void swizzle_alsa_channels_6_8bit(_THIS) { SWIZ6(Uint8); } 2809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall#undef SWIZ6 2829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 2849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall/* 2859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall * Called right before feeding this->mixbuf to the hardware. Swizzle channels 2869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall * from Windows/Mac order to the format alsalib will want. 2879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall */ 2889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic __inline__ void swizzle_alsa_channels(_THIS) 2899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 2909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (this->spec.channels == 6) { 2919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const Uint16 fmtsize = (this->spec.format & 0xFF); /* bits/channel. */ 2929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if (fmtsize == 16) 2939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall swizzle_alsa_channels_6_16bit(this); 2949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall else if (fmtsize == 8) 2959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall swizzle_alsa_channels_6_8bit(this); 2969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall else if (fmtsize == 32) 2979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall swizzle_alsa_channels_6_32bit(this); 2989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall else if (fmtsize == 64) 2999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall swizzle_alsa_channels_6_64bit(this); 3009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* !!! FIXME: update this for 7.1 if needed, later. */ 3039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_PlayAudio(_THIS) 3079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 3099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_uframes_t frames_left; 3109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const Uint8 *sample_buf = (const Uint8 *) mixbuf; 3119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const int frame_size = (((int) (this->spec.format & 0xFF)) / 8) * this->spec.channels; 3129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall swizzle_alsa_channels(this); 3149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall frames_left = ((snd_pcm_uframes_t) this->spec.samples); 3169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall while ( frames_left > 0 && this->enabled ) { 3189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* This works, but needs more testing before going live */ 3199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /*SDL_NAME(snd_pcm_wait)(pcm_handle, -1);*/ 3209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_writei)(pcm_handle, sample_buf, frames_left); 3229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 3239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status == -EAGAIN ) { 3249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Apparently snd_pcm_recover() doesn't handle this case - does it assume snd_pcm_wait() above? */ 3259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_Delay(1); 3269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall continue; 3279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_recover)(pcm_handle, status, 0); 3299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 3309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Hmm, not much we can do - abort */ 3319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "ALSA write failed (unrecoverable): %s\n", SDL_NAME(snd_strerror)(status)); 3329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall this->enabled = 0; 3339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return; 3349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall continue; 3369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall sample_buf += status * frame_size; 3389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall frames_left -= status; 3399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic Uint8 *ALSA_GetAudioBuf(_THIS) 3439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(mixbuf); 3459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic void ALSA_CloseAudio(_THIS) 3489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( mixbuf != NULL ) { 3509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_FreeAudioMem(mixbuf); 3519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall mixbuf = NULL; 3529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( pcm_handle ) { 3549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_drain)(pcm_handle); 3559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_close)(pcm_handle); 3569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall pcm_handle = NULL; 3579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int ALSA_finalize_hardware(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *hwparams, int override) 3619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 3639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_uframes_t bufsize; 3649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* "set" the hardware with the desired parameters */ 3669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params)(pcm_handle, hwparams); 3679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 3689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 3699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Get samples for the actual buffer size */ 3729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_get_buffer_size)(hwparams, &bufsize); 3739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 3749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 3759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( !override && bufsize != spec->samples * 2 ) { 3779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 3789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* FIXME: Is this safe to do? */ 3819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->samples = bufsize / 2; 3829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* This is useful for debugging */ 3849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( getenv("SDL_AUDIO_ALSA_DEBUG") ) { 3859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_uframes_t persize = 0; 3869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned int periods = 0; 3879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_hw_params_get_period_size)(hwparams, &persize, NULL); 3899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_hw_params_get_periods)(hwparams, &periods, NULL); 3909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall fprintf(stderr, "ALSA: period size = %ld, periods = %u, buffer size = %lu\n", persize, periods, bufsize); 3929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 3939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 3949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 3959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 3969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int ALSA_set_period_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override) 3979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 3989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const char *env; 3999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 4009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_t *hwparams; 4019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_uframes_t frames; 4029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned int periods; 4039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Copy the hardware parameters for this setup */ 4059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_alloca(&hwparams); 4069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params); 4079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( !override ) { 4099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall env = getenv("SDL_AUDIO_ALSA_SET_PERIOD_SIZE"); 4109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( env ) { 4119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall override = SDL_atoi(env); 4129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( override == 0 ) { 4139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall frames = spec->samples; 4199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_period_size_near)(pcm_handle, hwparams, &frames, NULL); 4209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall periods = 2; 4259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_periods_near)(pcm_handle, hwparams, &periods, NULL); 4269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return ALSA_finalize_hardware(this, spec, hwparams, override); 4319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 4329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int ALSA_set_buffer_size(_THIS, SDL_AudioSpec *spec, snd_pcm_hw_params_t *params, int override) 4349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 4359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall const char *env; 4369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 4379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_t *hwparams; 4389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_uframes_t frames; 4399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Copy the hardware parameters for this setup */ 4419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_alloca(&hwparams); 4429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_hw_params_copy)(hwparams, params); 4439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( !override ) { 4459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall env = getenv("SDL_AUDIO_ALSA_SET_BUFFER_SIZE"); 4469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( env ) { 4479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall override = SDL_atoi(env); 4489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( override == 0 ) { 4499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall frames = spec->samples * 2; 4559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_buffer_size_near)(pcm_handle, hwparams, &frames); 4569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return ALSA_finalize_hardware(this, spec, hwparams, override); 4619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 4629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hallstatic int ALSA_OpenAudio(_THIS, SDL_AudioSpec *spec) 4649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall{ 4659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall int status; 4669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_t *hwparams; 4679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_sw_params_t *swparams; 4689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_format_t format; 4699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned int rate; 4709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall unsigned int channels; 4719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall Uint16 test_format; 4729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Open the audio device */ 4749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Name of device should depend on # channels in spec */ 4759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_open)(&pcm_handle, get_audio_device(spec->channels), SND_PCM_STREAM_PLAYBACK, SND_PCM_NONBLOCK); 4769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't open audio device: %s", SDL_NAME(snd_strerror)(status)); 4799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Figure out what the hardware is capable of */ 4839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_hw_params_alloca(&hwparams); 4849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_any)(pcm_handle, hwparams); 4859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't get hardware config: %s", SDL_NAME(snd_strerror)(status)); 4879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 4889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* SDL only uses interleaved sample output */ 4929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_access)(pcm_handle, hwparams, SND_PCM_ACCESS_RW_INTERLEAVED); 4939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 4949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set interleaved access: %s", SDL_NAME(snd_strerror)(status)); 4959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 4969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 4979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 4989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 4999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Try for a closest match on audio format */ 5009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = -1; 5019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall for ( test_format = SDL_FirstAudioFormat(spec->format); 5029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall test_format && (status < 0); ) { 5039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall switch ( test_format ) { 5049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U8: 5059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_U8; 5069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S8: 5089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_S8; 5099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16LSB: 5119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_S16_LE; 5129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_S16MSB: 5149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_S16_BE; 5159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16LSB: 5179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_U16_LE; 5189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall case AUDIO_U16MSB: 5209682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = SND_PCM_FORMAT_U16_BE; 5219682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5229682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall default: 5239682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall format = 0; 5249682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall break; 5259682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5269682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( format != 0 ) { 5279682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_format)(pcm_handle, hwparams, format); 5289682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5299682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5309682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall test_format = SDL_NextAudioFormat(); 5319682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5329682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5339682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5349682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't find any hardware audio formats"); 5359682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5369682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5379682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5389682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->format = test_format; 5399682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5409682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the number of channels */ 5419682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_channels)(pcm_handle, hwparams, spec->channels); 5429682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall channels = spec->channels; 5439682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5449682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_get_channels)(hwparams, &channels); 5459682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5469682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set audio channels"); 5479682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5489682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5499682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5509682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->channels = channels; 5519682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5529682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5539682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the audio rate */ 5549682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall rate = spec->freq; 5559682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5569682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_hw_params_set_rate_near)(pcm_handle, hwparams, &rate, NULL); 5579682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5589682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set audio frequency: %s", SDL_NAME(snd_strerror)(status)); 5599682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5609682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5619682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5629682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall spec->freq = rate; 5639682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5649682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the buffer size, in samples */ 5659682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ALSA_set_period_size(this, spec, hwparams, 0) < 0 && 5669682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_set_buffer_size(this, spec, hwparams, 0) < 0 ) { 5679682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Failed to set desired buffer size, do the best you can... */ 5689682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( ALSA_set_period_size(this, spec, hwparams, 1) < 0 ) { 5699682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set hardware audio parameters: %s", SDL_NAME(snd_strerror)(status)); 5709682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5719682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5729682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5739682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5749682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 5759682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Set the software parameters */ 5769682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall snd_pcm_sw_params_alloca(&swparams); 5779682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_sw_params_current)(pcm_handle, swparams); 5789682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5799682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't get software config: %s", SDL_NAME(snd_strerror)(status)); 5809682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5819682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5829682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5839682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_sw_params_set_avail_min)(pcm_handle, swparams, spec->samples); 5849682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5859682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set minimum available samples: %s", SDL_NAME(snd_strerror)(status)); 5869682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5879682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5889682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5899682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_sw_params_set_start_threshold)(pcm_handle, swparams, 1); 5909682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5919682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set start threshold: %s", SDL_NAME(snd_strerror)(status)); 5929682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5939682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 5949682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 5959682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall status = SDL_NAME(snd_pcm_sw_params)(pcm_handle, swparams); 5969682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( status < 0 ) { 5979682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_SetError("Couldn't set software audio parameters: %s", SDL_NAME(snd_strerror)(status)); 5989682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 5999682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 6009682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6019682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6029682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Calculate the final parameters for this audio specification */ 6039682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_CalculateAudioSpec(spec); 6049682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6059682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Allocate mixing buffer */ 6069682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall mixlen = spec->size; 6079682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall mixbuf = (Uint8 *)SDL_AllocAudioMem(mixlen); 6089682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall if ( mixbuf == NULL ) { 6099682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall ALSA_CloseAudio(this); 6109682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(-1); 6119682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall } 6129682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_memset(mixbuf, spec->silence, spec->size); 6139682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6149682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* Switch to blocking mode for playback */ 6159682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall SDL_NAME(snd_pcm_nonblock)(pcm_handle, 0); 6169682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall 6179682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall /* We're ready to rock and roll. :-) */ 6189682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall return(0); 6199682c8870b8ff5e4ac2e4c70b759f791c6f38c1fJesse Hall} 620