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Use a callback to notify a new decoded frame

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Make the decoder independant of the SDL event mechanism.
This commit is contained in:
Romain Vimont 2021-02-14 15:26:21 +01:00
parent 2512c53227
commit e306bffbc0
3 changed files with 37 additions and 9 deletions
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17
app/src/decoder.c
View file

@ -2,7 +2,6 @@
#include <libavformat/avformat.h>
#include <libavutil/time.h>
#include <SDL2/SDL_events.h>
#include <unistd.h>
#include "events.h"
@ -18,18 +17,22 @@ push_frame(struct decoder *decoder) {
video_buffer_offer_decoded_frame(decoder->video_buffer,
&previous_frame_skipped);
if (previous_frame_skipped) {
// the previous EVENT_NEW_FRAME will consume this frame
// the previous callback will consume this frame
return;
}
static SDL_Event new_frame_event = {
.type = EVENT_NEW_FRAME,
};
SDL_PushEvent(&new_frame_event);
decoder->cbs->on_new_frame(decoder, decoder->cbs_userdata);
}
void
decoder_init(struct decoder *decoder, struct video_buffer *vb) {
decoder_init(struct decoder *decoder, struct video_buffer *vb,
const struct decoder_callbacks *cbs, void *cbs_userdata) {
decoder->video_buffer = vb;
assert(cbs);
assert(cbs->on_new_frame);
decoder->cbs = cbs;
decoder->cbs_userdata = cbs_userdata;
}
bool

12
app/src/decoder.h
View file

@ -11,10 +11,20 @@ struct video_buffer;
struct decoder {
struct video_buffer *video_buffer;
AVCodecContext *codec_ctx;
const struct decoder_callbacks *cbs;
void *cbs_userdata;
};
struct decoder_callbacks {
// Called when a new frame can be consumed by
// video_buffer_take_rendering_frame(decoder->video_buffer).
void (*on_new_frame)(struct decoder *decoder, void *userdata);
};
void
decoder_init(struct decoder *decoder, struct video_buffer *vb);
decoder_init(struct decoder *decoder, struct video_buffer *vb,
const struct decoder_callbacks *cbs, void *cbs_userdata);
bool
decoder_open(struct decoder *decoder, const AVCodec *codec);

17
app/src/scrcpy.c
View file

@ -306,6 +306,17 @@ av_log_callback(void *avcl, int level, const char *fmt, va_list vl) {
free(local_fmt);
}
static void
decoder_on_new_frame(struct decoder *decoder, void *userdata) {
(void) decoder;
(void) userdata;
static SDL_Event new_frame_event = {
.type = EVENT_NEW_FRAME,
};
SDL_PushEvent(&new_frame_event);
}
bool
scrcpy(const struct scrcpy_options *options) {
if (!server_init(&server)) {
@ -386,7 +397,11 @@ scrcpy(const struct scrcpy_options *options) {
file_handler_initialized = true;
}
decoder_init(&decoder, &video_buffer);
static const struct decoder_callbacks decoder_cbs = {
.on_new_frame = decoder_on_new_frame,
};
decoder_init(&decoder, &video_buffer, &decoder_cbs, NULL);
dec = &decoder;
}