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/kms_software.c | 129 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 129 insertions(+)
 create mode 100644 src/capture/kms_software.c

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

diff --git a/src/capture/kms_software.c b/src/capture/kms_software.c
new file mode 100644
index 0000000..1f4daf4
--- /dev/null
+++ b/src/capture/kms_software.c
@@ -0,0 +1,129 @@
+#include "../../include/capture/kms_software.h"
+#include "../../include/capture/kms.h"
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <assert.h>
+#include <libavcodec/avcodec.h>
+
+typedef struct {
+    gsr_capture_kms kms;
+    gsr_capture_kms_software_params params;
+} gsr_capture_kms_software;
+
+static void gsr_capture_kms_software_stop(gsr_capture *cap, AVCodecContext *video_codec_context);
+
+#define GL_DYNAMIC_READ                   0x88E9
+
+static int gsr_capture_kms_software_start(gsr_capture *cap, AVCodecContext *video_codec_context, AVFrame *frame) {
+    gsr_capture_kms_software *cap_kms = cap->priv;
+
+    const int res = gsr_capture_kms_start(&cap_kms->kms, cap_kms->params.display_to_capture, cap_kms->params.egl, video_codec_context, frame);
+    if(res != 0) {
+        gsr_capture_kms_software_stop(cap, video_codec_context);
+        return res;
+    }
+
+    if(!gsr_capture_base_setup_textures(&cap_kms->kms.base, frame, cap_kms->params.color_range, GSR_SOURCE_COLOR_RGB, cap_kms->params.hdr, cap_kms->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_NVIDIA)) {
+        gsr_capture_kms_software_stop(cap, video_codec_context);
+        return -1;
+    }
+
+    return 0;
+}
+
+static bool gsr_capture_kms_software_should_stop(gsr_capture *cap, bool *err) {
+    gsr_capture_kms_software *cap_kms = cap->priv;
+    if(cap_kms->kms.should_stop) {
+        if(err)
+            *err = cap_kms->kms.stop_is_error;
+        return true;
+    }
+
+    if(err)
+        *err = false;
+    return false;
+}
+
+static int gsr_capture_kms_software_capture(gsr_capture *cap, AVFrame *frame) {
+    gsr_capture_kms_software *cap_kms = cap->priv;
+
+    cap_kms->kms.base.egl->glClear(0);
+    gsr_capture_kms_capture(&cap_kms->kms, frame, cap_kms->params.hdr, cap_kms->params.egl->gpu_info.vendor != GSR_GPU_VENDOR_AMD, cap_kms->params.egl->gpu_info.vendor == GSR_GPU_VENDOR_NVIDIA, cap_kms->params.record_cursor);
+
+    // TODO: hdr support
+    const unsigned int formats[2] = { GL_RED, GL_RG };
+    for(int i = 0; i < 2; ++i) {
+        cap_kms->params.egl->glBindTexture(GL_TEXTURE_2D, cap_kms->kms.base.target_textures[i]);
+        cap_kms->params.egl->glGetTexImage(GL_TEXTURE_2D, 0, formats[i], GL_UNSIGNED_BYTE, frame->data[i]);
+    }
+    cap_kms->params.egl->glBindTexture(GL_TEXTURE_2D, 0);
+
+    cap_kms->kms.base.egl->eglSwapBuffers(cap_kms->kms.base.egl->egl_display, cap_kms->kms.base.egl->egl_surface);
+
+    return 0;
+}
+
+static void gsr_capture_kms_software_capture_end(gsr_capture *cap, AVFrame *frame) {
+    (void)frame;
+    gsr_capture_kms_software *cap_kms = cap->priv;
+    gsr_capture_kms_cleanup_kms_fds(&cap_kms->kms);
+}
+
+static void gsr_capture_kms_software_stop(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    (void)video_codec_context;
+    gsr_capture_kms_software *cap_kms = cap->priv;
+    gsr_capture_kms_stop(&cap_kms->kms);
+}
+
+static void gsr_capture_kms_software_destroy(gsr_capture *cap, AVCodecContext *video_codec_context) {
+    (void)video_codec_context;
+    gsr_capture_kms_software *cap_kms = cap->priv;
+    if(cap->priv) {
+        gsr_capture_kms_software_stop(cap, video_codec_context);
+        free((void*)cap_kms->params.display_to_capture);
+        cap_kms->params.display_to_capture = NULL;
+        free(cap->priv);
+        cap->priv = NULL;
+    }
+    free(cap);
+}
+
+gsr_capture* gsr_capture_kms_software_create(const gsr_capture_kms_software_params *params) {
+    if(!params) {
+        fprintf(stderr, "gsr error: gsr_capture_kms_software_create params is NULL\n");
+        return NULL;
+    }
+
+    gsr_capture *cap = calloc(1, sizeof(gsr_capture));
+    if(!cap)
+        return NULL;
+
+    gsr_capture_kms_software *cap_kms = calloc(1, sizeof(gsr_capture_kms_software));
+    if(!cap_kms) {
+        free(cap);
+        return NULL;
+    }
+
+    const char *display_to_capture = strdup(params->display_to_capture);
+    if(!display_to_capture) {
+        free(cap);
+        free(cap_kms);
+        return NULL;
+    }
+
+    cap_kms->params = *params;
+    cap_kms->params.display_to_capture = display_to_capture;
+    
+    *cap = (gsr_capture) {
+        .start = gsr_capture_kms_software_start,
+        .tick = NULL,
+        .should_stop = gsr_capture_kms_software_should_stop,
+        .capture = gsr_capture_kms_software_capture,
+        .capture_end = gsr_capture_kms_software_capture_end,
+        .destroy = gsr_capture_kms_software_destroy,
+        .priv = cap_kms
+    };
+
+    return cap;
+}
-- 
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