From e3507b390e8eecd19c04df04980ee3213ad2de8f Mon Sep 17 00:00:00 2001 From: "Ryan C. Gordon" Date: Tue, 22 Apr 2025 16:54:06 -0400 Subject: [PATCH] examples: added audio/05-planar-data --- examples/CMakeLists.txt | 1 + examples/audio/05-planar-data/README.txt | 7 + .../audio/05-planar-data/onmouseover.webp | Bin 0 -> 17488 bytes examples/audio/05-planar-data/planar-data.c | 366 ++++++++++++++++++ examples/audio/05-planar-data/thumbnail.png | Bin 0 -> 2637 bytes 5 files changed, 374 insertions(+) create mode 100644 examples/audio/05-planar-data/README.txt create mode 100644 examples/audio/05-planar-data/onmouseover.webp create mode 100644 examples/audio/05-planar-data/planar-data.c create mode 100644 examples/audio/05-planar-data/thumbnail.png diff --git a/examples/CMakeLists.txt b/examples/CMakeLists.txt index 58406f6221..6efc021546 100644 --- a/examples/CMakeLists.txt +++ b/examples/CMakeLists.txt @@ -141,6 +141,7 @@ add_sdl_example_executable(audio-simple-playback SOURCES audio/01-simple-playbac add_sdl_example_executable(audio-simple-playback-callback SOURCES audio/02-simple-playback-callback/simple-playback-callback.c) add_sdl_example_executable(audio-load-wav SOURCES audio/03-load-wav/load-wav.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.wav) add_sdl_example_executable(audio-multiple-streams SOURCES audio/04-multiple-streams/multiple-streams.c DATAFILES ${CMAKE_CURRENT_SOURCE_DIR}/../test/sample.wav ${CMAKE_CURRENT_SOURCE_DIR}/../test/sword.wav) +add_sdl_example_executable(audio-planar-data SOURCES audio/05-planar-data/planar-data.c) add_sdl_example_executable(input-joystick-polling SOURCES input/01-joystick-polling/joystick-polling.c) add_sdl_example_executable(input-joystick-events SOURCES input/02-joystick-events/joystick-events.c) add_sdl_example_executable(camera-read-and-draw SOURCES camera/01-read-and-draw/read-and-draw.c) diff --git a/examples/audio/05-planar-data/README.txt b/examples/audio/05-planar-data/README.txt new file mode 100644 index 0000000000..c7bd0ab5e8 --- /dev/null +++ b/examples/audio/05-planar-data/README.txt @@ -0,0 +1,7 @@ +This example code draws two clickable buttons. Each causes a sound to play, +fed to either the left or right audio channel through separate (planar) +arrays. + +Planar audio can feed both channels at the same time from different arrays, +as well, but this example only uses one channel at a time for clarity. A +NULL array will supply silence for that channel. diff --git a/examples/audio/05-planar-data/onmouseover.webp b/examples/audio/05-planar-data/onmouseover.webp new file mode 100644 index 0000000000000000000000000000000000000000..90880c9e4544826bd5afa597497eed33ea79a96e GIT binary patch literal 17488 zcmeHO2{@Er+n*U*$dY|u%I41}5o|LG-*L^Z^P--{#QLj4(WY$?SVnR`DF8)p=qREb9R*b8 zoUq<7EIMkat=!#NT=16)H_%>|h-e!#_`MUMeNdcu$8M)OcV}+@PG903go?~8U`1OU zQr|t3+kdCxK4A@*RF>q)i1^PYDR|SBvo+iJg!GSF^S?B_H4<{EztH)0n#;b42X3`T zT**2Y;)SOY5ou_$hL4`5#Vr_M8Gz*-Y+6V88KUBap0t@7C`^%$F^(6IH}4qFh;l-I>R;pQ zkK*gmzLxhxaA)02%;y-qjf!k}>Q?p3QuU%nDd3H+@1GKOFwpf~-gXRh!c&Ah!a~L? zZuG*A?~1dLVJn+3Y*k8G^o^*YpH3KS^@okYu~qszP9wPBp#rzR$|`K^RCe9(`(2Cm zS6Mp-taWGW34wv1%&H6U&abWC-6teOr*HorK&oeDS?;t_5#ne!bg&OLl03zF&ZGTy zS`H@x5i%%M;$3~svt%!tBG(DQqexy>l&di3OpFw7S|B{DhJanzd|XEK0T8eafFW1l zpsh`0(#|(z?*hTD_L)F!Q*I7%Y_}i1_DJ!A&2%>Sl!k(6V9U3s+ZoZ-%WHy>Wj|hT zf3f=hVsk!}VLh;b9g|0|Em9X#U(suwqft7X=WIZ&7s9RwejLYlxLvDiY;@`!u8HYM z=aF2nu_8iqOGeFbHGkqw8OB!YcCE9WSv{8+h+?7A4t^uAx*oWHPn;Wt(qWm#Q^(<)?Fi|Wd_tD^wwAs zt%6l_NZT~We8$_0sfuiI7!dEQHYoG|-m9%Zq7=g^1x(HOrw zD}z#!JXMEkWFi_Xo0`rrYzKR@$1B_fJE#WnlpN|bew_~v6z~0#5{OdCO-ch{h0?f2 zYGMQ)pVAVLH}Kt%O$Jfx>3={9H&OJX;|NYm2I~OwwLz@$JI&P3h+Gl zWb~m`kzho$T{KH1@}m|;anoUCRAHmWY)R-~4?QE~+SWmMg#Fz-bd8sO2brzf2Ad?zq*5HN;(}P2ZL6_)w}fiF%&voZsNOdJBxQhz3HPmi z4?dhRV*I9DzVwl<8o-AB@w=JnM7)}n{%*WQhJD(^iQ4b_LR>Yy9YB1-u|$(V%N61q@UKxfc`6ZoD}8s_`G@^>`DKkRtl^k z4WfEcc6&(xH@C38`7KYLBNP_8!F4n@Gzj;0%QgVBb-M2mv-18|A6t6Qv-aP}cM=k? zC{%3wO4e$b!akC!W^_rM16x}7Mn&sjHFnh{j5&>he}$(nQBHF5PM<*=MX0(P`FrUz ztmDC(8O*x%=4TTqp^TRpK)cLm!|&(|JEZyj`tMnt>)Sdx%T@I}KrAPSywJo;p7xIgDxP>~!cD*H?OKMh zm8C6)HqHU#=S{r=%HCfXTc|JB-Ee11xNUo2g!9<>;c-Vvs_m*HG0iF3V8dax+m?yX z6Vt|vygi5B$p3(Yf{&vW!>t@N`2@AouWMXD+pM_AftZpL)4>Nol42){u;zuwC)=94XS(bqLq$QHT zul-NV#(vW97486!foEhh!4*%o9*ZsukAbadKx*j7H*9~Hzi_CJ`G0fSuOoSU@#WO z^qh}_|ADg4R7Zv6Y4)WNb)Z-fx_}T|A)^n{XfHBnwr&JQ2ypvUBW=8zOy=2}cJuP> zo{rPYQ(ak_OYq(@X&gVak}xv0dirzL4`(_f$oDZaQ>)jp8zvM~HAfO{S&`#u8xTxxw9%}Z=qJknKR z{CsQiwaLO@mwMJU1kFJ7!(47q7lL<+KZ3FT z!~3cfT48n3(yB^jhT8pt}Cw>YC`k=D$Rxb~K4{NpVB< zQF+)Z7w5OeT@`Rg3=9GUwZGN)JTmbVW>4@ViZTF=*<&wzOzL+6wWBBk!qMMqd5FO| zmOVoAQ+Awu^_vDsP>M>0OH2Thc4Z^HcsJOlbe+Jeem5!QNYqe_W1h15rLWM~fy{;l zbp=2SwCj+)2Iy#`JVoHiHNCsbt;HP%PvaI#yG6NoB+9ECvX?(`BpKanM$xSdHe)m$ zA#j64qI&gOWK1pH@g6}<6F`GpkHa8=4hLC(ihS@3C#5nVgQRP#B)cGRrTpPKG^k)y%Dx~EDAR_*na7&o)Kumwr;dc92bOGhy}Rs`g|VWYPQ6Ygnn_^neUFP`?I+);V=KA9@VtDW6|PXhW7JFSOL z(3Ou9d{{!G0yu^!0+*W5AEYbCS6%6MX*EH{BLvP6{nDmuOHBTWb!l=5Bx0LpHb zKorCs5DYbc?5WL#0H^jg*67`%xVCJN)HtuCTPGY-FhScyDjR@XJ&M>(ev6fSHZeij>xrx?lWhn`Sj}?Ax(w2(_v%b4BIz+JXmVZ z6^xs#xWF5)h+I53noNHlx=B_M;qY(_fm!)Av z@+>;!k#bmcWuXT0wLc?;1*o$|-|Txz%xzum#^~!;ggXOMkM!pB%=6NFBBkg1BJQ&B z2_nu;yS5@k&72#lnrC=8A01&S6J!Lr`Uc<*C$=WAPHOz|Nh0mi!w+wjG~5Q^B{D%pmOYwCPh^X!B*WxeeJ{Nr31bvuHA^}efK;Axoj0YDL|=RP>MVJ=)2Y{K@-|>I{qm7aV6$tzDIWI7<~IYCY~|N4Pab@x9mmG?;nd?b>pZrz;Z`|m z1&v3+Tx$z5F^(0Lv6BpJtH*NFl0IAl-TyzvVgY2R6uSvwmkRNKAL=|On4}_M#d}UT zuT3?4*iK)%nF80Nt z7^(#Lba}g|)y>K^0*%4N>__@B!4wao=3=|OcGCm9$~GIs=eoX>1_t4Pev zZXH;BQ2jb;O(uun5ZyrirK1;HUWIyn&FdkU=GKl|jNxPRoWu6|4Nj!qjVkgkJnA*g z8^go{gU6dD{ji9`KiOFkKHgf5-@Q|AFy7+U)3m^o9@U)azK~CV4+^1HfK|Y%t)MNr z5d@!Bg`Qb94sZpWZ)mETw;^HQZ^mXh7(skOWW<{|Mewp~7uffu2&6lr9(%lCQwHy+ zSuQ(haYhX=YyM?3*8EL;h&Vgc;|B-kxPaR6+~-kS{Bpw~WFHG9LkN-8VWm$TE2bFb zM2wjMxf*K(-eCnj7*o~q4Sck)-LrtPWdP)I+bp6WB5WYyv5aY8rN|2eD{p%BbO;slp3n~88QU_jsOR>3I|iZ8Te9Gs zD!=qh_(Y&*uUeN9qCfSjLPdeHdQE4mZi8XvNpaEDmQXH-p2 z+J8_IK$#^M_IV#lh&ynj=)lu|q6hkWN_aOJ2mW`lEd8*=LeWPM`> zt*>CNzAv*LWR{bvuj8-rS%$OM=L!gTXl6se1BiVz?{unI zN_{ocjg(K)GlD44 +#include + +/* We will use this renderer to draw into this window every frame. */ +static SDL_Window *window = NULL; +static SDL_Renderer *renderer = NULL; +static SDL_AudioStream *stream = NULL; + +/* location of buttons on the screen. */ +static const SDL_FRect rect_left_button = { 100, 170, 100, 100 }; +static const SDL_FRect rect_right_button = { 440, 170, 100, 100 }; + +/* -1 if we're currently playing left, 1 if playing right, 0 if not playing. */ +static int playing_sound = 0; + +/* Raw audio data. These arrays are at the end of the source file. */ +static const Uint8 left[1870]; +static const Uint8 right[1777]; + + +/* This function runs once at startup. */ +SDL_AppResult SDL_AppInit(void **appstate, int argc, char *argv[]) +{ + const SDL_AudioSpec spec = { SDL_AUDIO_U8, 2, 4000 }; /* Uint8 data, stereo, 4000Hz. */ + + SDL_SetAppMetadata("Example Audio Planar Data", "1.0", "com.example.audio-planar-data"); + + if (!SDL_Init(SDL_INIT_VIDEO | SDL_INIT_AUDIO)) { + SDL_Log("Couldn't initialize SDL: %s", SDL_GetError()); + return SDL_APP_FAILURE; + } + + if (!SDL_CreateWindowAndRenderer("examples/audio/planar-data", 640, 480, 0, &window, &renderer)) { + SDL_Log("Couldn't create window/renderer: %s", SDL_GetError()); + return SDL_APP_FAILURE; + } + + stream = SDL_OpenAudioDeviceStream(SDL_AUDIO_DEVICE_DEFAULT_PLAYBACK, &spec, NULL, NULL); + if (!stream) { + SDL_Log("Couldn't open audio device stream: %s", SDL_GetError()); + return SDL_APP_FAILURE; + } + + SDL_ResumeAudioStreamDevice(stream); /* SDL_OpenAudioDeviceStream starts the device paused. Resume it! */ + + return SDL_APP_CONTINUE; /* carry on with the program! */ +} + +/* This function runs when a new event (mouse input, keypresses, etc) occurs. */ +SDL_AppResult SDL_AppEvent(void *appstate, SDL_Event *event) +{ + if (event->type == SDL_EVENT_QUIT) { + return SDL_APP_SUCCESS; /* end the program, reporting success to the OS. */ + } else if (event->type == SDL_EVENT_MOUSE_BUTTON_DOWN) { + if (playing_sound == 0) { /* nothing currently playing? */ + const SDL_FPoint point = { event->button.x, event->button.y }; + if (SDL_PointInRectFloat(&point, &rect_left_button)) { /* clicked left button? */ + const Uint8 *planes[] = { left, NULL }; /* specify NULL to say "this specific channel is silent" */ + SDL_PutAudioStreamPlanarData(stream, (const void * const *) planes, SDL_arraysize(left)); + SDL_FlushAudioStream(stream); /* that's all we're playing until it completes. */ + playing_sound = -1; /* left is playing */ + } else if (SDL_PointInRectFloat(&point, &rect_right_button)) { /* clicked right button? */ + const Uint8 *planes[] = { NULL, right }; /* specify NULL to say "this specific channel is silent" */ + SDL_PutAudioStreamPlanarData(stream, (const void * const *) planes, SDL_arraysize(right)); + SDL_FlushAudioStream(stream); /* that's all we're playing until it completes. */ + playing_sound = 1; /* right is playing */ + } + } + } + + return SDL_APP_CONTINUE; /* carry on with the program! */ +} + +static void render_button(const SDL_FRect *rect, const char *str, int button_value) +{ + float x, y; + + if (playing_sound == button_value) { + SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255); /* green while playing */ + } else { + SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255); /* blue while not playing */ + } + + SDL_RenderFillRect(renderer, rect); + SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255); + + x = rect->x + ((rect->w - (SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE * SDL_strlen(str))) / 2.0f); + y = rect->y + ((rect->h - SDL_DEBUG_TEXT_FONT_CHARACTER_SIZE) / 2.0f); + SDL_RenderDebugText(renderer, x, y, str); +} + +/* This function runs once per frame, and is the heart of the program. */ +SDL_AppResult SDL_AppIterate(void *appstate) +{ + if (playing_sound) { + if (SDL_GetAudioStreamQueued(stream) == 0) { /* sound is done? We can play a new sound now. */ + playing_sound = 0; + } + } + + SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); + SDL_RenderClear(renderer); + + render_button(&rect_left_button, "LEFT", -1); + render_button(&rect_right_button, "RIGHT", 1); + + SDL_RenderPresent(renderer); + + return SDL_APP_CONTINUE; /* carry on with the program! */ +} + +/* This function runs once at shutdown. */ +void SDL_AppQuit(void *appstate, SDL_AppResult result) +{ + SDL_DestroyAudioStream(stream); + /* SDL will clean up the window/renderer for us. */ +} + + + +/* This is the audio data, as raw PCM samples (Uint8, 1 channel, 4000Hz) packed into C byte arrays for convenience. */ + +static const Uint8 left[1870] = { + 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x80, 0x81, 0x80, 0x81, 0x82, 0x82, + 0x83, 0x83, 0x83, 0x83, 0x83, 0x82, 0x82, 0x81, 0x80, 0x80, 0x80, 0x7f, 0x7e, 0x7e, 0x7e, 0x7d, + 0x7b, 0x7b, 0x7b, 0x7b, 0x7c, 0x7d, 0x7d, 0x7e, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x85, 0x84, + 0x84, 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0x80, 0x7f, 0x80, 0x80, 0x81, 0x80, 0x80, 0x7f, 0x7e, 0x7f, 0x7e, 0x7e, 0x7e, 0x7e, + 0x7f, 0x7f, 0x7f, 0x7f, 0x7f, 0x80, 0x7f, 0x80, 0x80, 0x7f, 0x80, 0x7e, 0x7f, 0x7e +}; + +static const Uint8 right[1777] = { + 0x7f, 0x7e, 0x7e, 0x7f, 0x80, 0x80, 0x80, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x82, 0x83, 0x83, 0x83, + 0x82, 0x81, 0x81, 0x80, 0x7f, 0x7e, 0x7c, 0x7b, 0x7a, 0x7a, 0x79, 0x79, 0x79, 0x7a, 0x7a, 0x7b, + 0x7c, 0x7e, 0x80, 0x82, 0x84, 0x86, 0x88, 0x89, 0x89, 0x89, 0x88, 0x87, 0x84, 0x82, 0x80, 0x7e, + 0x7c, 0x7b, 0x7a, 0x7a, 0x79, 0x78, 0x77, 0x75, 0x76, 0x77, 0x78, 0x78, 0x78, 0x7b, 0x81, 0x87, + 0x8c, 0x8e, 0x90, 0x92, 0x91, 0x8d, 0x87, 0x81, 0x7d, 0x7b, 0x7a, 0x79, 0x79, 0x7a, 0x79, 0x78, + 0x75, 0x74, 0x75, 0x75, 0x75, 0x76, 0x76, 0x76, 0x76, 0x7b, 0x83, 0x88, 0x8b, 0x8f, 0x95, 0x98, + 0x95, 0x8d, 0x86, 0x83, 0x80, 0x7e, 0x7c, 0x7c, 0x7e, 0x7e, 0x7c, 0x79, 0x78, 0x76, 0x75, 0x72, + 0x73, 0x74, 0x72, 0x6f, 0x6d, 0x72, 0x7e, 0x87, 0x8b, 0x90, 0x98, 0x9f, 0x9b, 0x91, 0x85, 0x7f, + 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