From 62d61fda12e3774fee6b671e44fb89bd2ef8da8c Mon Sep 17 00:00:00 2001
From: dec05eba <dec05eba@protonmail.com>
Date: Thu, 4 Jul 2024 01:35:03 +0200
Subject: Add support for software video encoding with '-encoder cpu' option,
 currently h264 only

---
 src/capture/xcomposite_software.c | 113 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 113 insertions(+)
 create mode 100644 src/capture/xcomposite_software.c

(limited to 'src/capture/xcomposite_software.c')

diff --git a/src/capture/xcomposite_software.c b/src/capture/xcomposite_software.c
new file mode 100644
index 0000000..4284cb3
--- /dev/null
+++ b/src/capture/xcomposite_software.c
@@ -0,0 +1,113 @@
+#include "../../include/capture/xcomposite_software.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <libavutil/frame.h>
+#include <libavcodec/avcodec.h>
+
+typedef struct {
+    gsr_capture_xcomposite xcomposite;
+} gsr_capture_xcomposite_software;
+
+static void gsr_capture_xcomposite_software_stop(gsr_capture *cap, AVCodecContext *video_codec_context);
+
+static int gsr_capture_xcomposite_software_start(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame *frame) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+
+    const int res = gsr_capture_xcomposite_start(&cap_xcomp->xcomposite, video_codec_context, frame);
+    if(res != 0) {
+        gsr_capture_xcomposite_software_stop(cap, video_codec_context);
+        return res;
+    }
+
+    if(!gsr_capture_base_setup_textures(&cap_xcomp->xcomposite.base, frame, cap_xcomp->xcomposite.params.color_range, GSR_SOURCE_COLOR_RGB, false, false)) {
+        gsr_capture_xcomposite_software_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    return 0;
+}
+
+static void gsr_capture_xcomposite_software_stop(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    (void)video_codec_context;
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+    gsr_capture_xcomposite_stop(&cap_xcomp->xcomposite);
+}
+
+static void gsr_capture_xcomposite_software_tick(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+    gsr_capture_xcomposite_tick(&cap_xcomp->xcomposite, video_codec_context);
+}
+
+static bool gsr_capture_xcomposite_software_is_damaged(gsr_capture *cap) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+    return gsr_capture_xcomposite_is_damaged(&cap_xcomp->xcomposite);
+}
+
+static void gsr_capture_xcomposite_software_clear_damage(gsr_capture *cap) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+    gsr_capture_xcomposite_clear_damage(&cap_xcomp->xcomposite);
+}
+
+static bool gsr_capture_xcomposite_software_should_stop(gsr_capture *cap, bool *err) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+    return gsr_capture_xcomposite_should_stop(&cap_xcomp->xcomposite, err);
+}
+
+static int gsr_capture_xcomposite_software_capture(gsr_capture *cap, AVFrame *frame) {
+    gsr_capture_xcomposite_software *cap_xcomp = cap->priv;
+
+    gsr_capture_xcomposite_capture(&cap_xcomp->xcomposite, frame);
+
+    const unsigned int formats[2] = { GL_RED, GL_RG };
+    for(int i = 0; i < 2; ++i) {
+        cap_xcomp->xcomposite.params.egl->glBindTexture(GL_TEXTURE_2D, cap_xcomp->xcomposite.base.target_textures[i]);
+        cap_xcomp->xcomposite.params.egl->glGetTexImage(GL_TEXTURE_2D, 0, formats[i], GL_UNSIGNED_BYTE, frame->data[i]);
+    }
+    cap_xcomp->xcomposite.params.egl->glBindTexture(GL_TEXTURE_2D, 0);
+
+    cap_xcomp->xcomposite.params.egl->eglSwapBuffers(cap_xcomp->xcomposite.params.egl->egl_display, cap_xcomp->xcomposite.params.egl->egl_surface);
+
+    return 0;
+}
+
+static void gsr_capture_xcomposite_software_destroy(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    if(cap->priv) {
+        gsr_capture_xcomposite_software_stop(cap, video_codec_context);
+        free(cap->priv);
+        cap->priv = NULL;
+    }
+    free(cap);
+}
+
+gsr_capture* gsr_capture_xcomposite_software_create(const gsr_capture_xcomposite_software_params *params) {
+    if(!params) {
+        fprintf(stderr, "gsr error: gsr_capture_xcomposite_software_create params is NULL\n");
+        return NULL;
+    }
+
+    gsr_capture *cap = calloc(1, sizeof(gsr_capture));
+    if(!cap)
+        return NULL;
+
+    gsr_capture_xcomposite_software *cap_xcomp = calloc(1, sizeof(gsr_capture_xcomposite_software));
+    if(!cap_xcomp) {
+        free(cap);
+        return NULL;
+    }
+
+    gsr_capture_xcomposite_init(&cap_xcomp->xcomposite, &params->base);
+    
+    *cap = (gsr_capture) {
+        .start = gsr_capture_xcomposite_software_start,
+        .tick = gsr_capture_xcomposite_software_tick,
+        .is_damaged = gsr_capture_xcomposite_software_is_damaged,
+        .clear_damage = gsr_capture_xcomposite_software_clear_damage,
+        .should_stop = gsr_capture_xcomposite_software_should_stop,
+        .capture = gsr_capture_xcomposite_software_capture,
+        .capture_end = NULL,
+        .destroy = gsr_capture_xcomposite_software_destroy,
+        .priv = cap_xcomp
+    };
+
+    return cap;
+}
-- 
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