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Refactored audio conversion to reduce copying

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More of the logic has been moved into SDL_AudioQueue,
allowing data to be converted directly from the input buffer.
This commit is contained in:
Brick 2024-04-04 19:22:29 +01:00 • committed by Sam Lantinga
parent ae57b0c9d8
commit edaab8ad9f
7 changed files with 478 additions and 409 deletions
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9
test/testaudiostreamdynamicresample.c
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@ -10,8 +10,6 @@
freely.
*/
/* !!! FIXME: this code is not up to standards for SDL3 test apps. Someone should improve this. */
#include <SDL3/SDL.h>
#include <SDL3/SDL_main.h>
#include <SDL3/SDL_test.h>
@ -117,6 +115,7 @@ static void queue_audio()
SDL_Log("Converting audio from %i to %i", spec.freq, new_spec.freq);
/* You shouldn't actually use SDL_ConvertAudioSamples like this (just put the data straight into the stream and let it handle conversion) */
retval = retval ? retval : SDL_ConvertAudioSamples(&spec, audio_buf, audio_len, &new_spec, &new_data, &new_len);
retval = retval ? retval : SDL_SetAudioStreamFormat(stream, &new_spec, NULL);
retval = retval ? retval : SDL_PutAudioStreamData(stream, new_data, new_len);
@ -207,6 +206,7 @@ static void loop(void)
SDL_Event e;
SDL_FPoint p;
SDL_AudioSpec src_spec, dst_spec;
int queued_bytes = 0;
int available_bytes = 0;
float available_seconds = 0;
@ -294,6 +294,8 @@ static void loop(void)
}
}
queued_bytes = SDL_GetAudioStreamQueued(stream);
for (i = 0; i < state->num_windows; i++) {
int draw_y = 0;
SDL_Renderer* rend = state->renderers[i];
@ -326,6 +328,9 @@ static void loop(void)
draw_textf(rend, 0, draw_y, "Available: %4.2f (%i bytes)", available_seconds, available_bytes);
draw_y += FONT_LINE_HEIGHT;
draw_textf(rend, 0, draw_y, "Queued: %i bytes", queued_bytes);
draw_y += FONT_LINE_HEIGHT;
SDL_LockAudioStream(stream);
draw_textf(rend, 0, draw_y, "Get Callback: %i/%i bytes, %2i ms ago",