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Use fps to set appropriate audio buffer size 

If we get a sane container-fps value from mpv, we use it to set an
appropriate buffer size length.

Added some further comments.

Signed-off-by: Mahyar Koshkouei <mahyar.koshkouei@gmail.com>
This commit is contained in:
Mahyar Koshkouei 2018-02-23 12:27:43 +00:00
parent 6e0e2b949c
commit 6bb5c358f3
1 changed files with 25 additions and 6 deletions
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31
mpv-libretro.c
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@ -16,6 +16,7 @@
*/
#include <dlfcn.h>
#include <math.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
@ -305,6 +306,9 @@ static void context_reset(void)
mpv_set_option_string(mpv, "ao", "audio-cb");
/* Attempt to enable hardware acceleration. MPV will fallback to software
* decoding on failure.
*/
if(mpv_set_option_string(mpv, "hwdec", "auto") < 0)
log_cb(RETRO_LOG_ERROR, "failed to set hwdec option\n");
@ -330,8 +334,14 @@ static void context_reset(void)
/* TODO #2: Check for the highest samplerate in audio stream, and use that.
* Fall back to 48kHz otherwise.
* We currently force the audio to be sampled at 48KHz.
*/
mpv_set_option_string(mpv, "audio-samplerate", "48000");
mpv_set_option_string(mpv, "opengl-swapinterval", "0");
/* The following works best when vsync is switched off in Retroarch. */
//mpv_set_option_string(mpv, "video-sync", "display-resample");
//mpv_set_option_string(mpv, "display-fps", "60");
log_cb(RETRO_LOG_INFO, "Context reset.\n");
@ -397,10 +407,10 @@ void retro_reset(void)
return;
}
static void audio_callback(void)
static void audio_callback(double fps)
{
/* Obtain len samples to reduce lag. */
int len = 2*1024;
int len = 48000 / (int)floor(fps);
static int16_t frames[512];
while(len > 0)
@ -493,11 +503,13 @@ void retro_run(void)
*/
static bool updated_video_dimensions = false;
static int64_t width = 0, height = 0;
static double container_fps = 30.0f;
if(updated_video_dimensions == false)
{
mpv_get_property(mpv, "dwidth", MPV_FORMAT_INT64, &width);
mpv_get_property(mpv, "dheight", MPV_FORMAT_INT64, &height);
mpv_get_property(mpv, "container-fps", MPV_FORMAT_DOUBLE, &container_fps);
/* We don't know the dimensions of the video when
* retro_get_system_av_info is called, so we have to set it here for
@ -514,8 +526,10 @@ void retro_run(void)
.aspect_ratio = -1,
};
log_cb(RETRO_LOG_INFO, "Setting fps to %f\n", container_fps);
struct retro_system_timing timing = {
.fps = 60.0f,
.fps = container_fps,
.sample_rate = 48000.0f,
};
@ -534,6 +548,10 @@ void retro_run(void)
retropad_update_input();
/* TODO #2: Implement an audio callback feature in to libmpv */
audio_callback(container_fps);
#if 1
if(frame_queue > 0)
{
mpv_opengl_cb_draw(mpv_gl, hw_render.get_current_framebuffer(), width, height);
@ -542,9 +560,10 @@ void retro_run(void)
}
else
video_cb(NULL, width, height, 0);
/* TODO #2: Implement an audio callback feature in to libmpv */
audio_callback();
#else
mpv_opengl_cb_draw(mpv_gl, hw_render.get_current_framebuffer(), width, height);
video_cb(RETRO_HW_FRAME_BUFFER_VALID, width, height, 0);
#endif
return;
}