From cbac1496b1c8023a7fdede63e9556f2de82bbafe Mon Sep 17 00:00:00 2001
From: cxp2249 <moritz.pirk@tuhh.de>
Date: Sat, 27 Jan 2018 02:30:12 +0100
Subject: added creator.h and creator.c         - video capabilities are
 implemented but not tested by now 	- mandelbrot zoom has to be
 implemented from current render.c just 	  a single picture is used by
 now         - libav libraries are required

---
 src/creator.c | 143 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 143 insertions(+)
 create mode 100644 src/creator.c

(limited to 'src/creator.c')

diff --git a/src/creator.c b/src/creator.c
new file mode 100644
index 0000000..71a981f
--- /dev/null
+++ b/src/creator.c
@@ -0,0 +1,143 @@
+#include <creator.h>
+#include <render.h>
+
+static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
+                   FILE *outfile)
+{
+    int ret;
+    /* send the frame to the encoder */
+    ret = avcodec_send_frame(enc_ctx, frame);
+    if (ret < 0) {
+        fprintf(stderr, "error sending a frame for encoding\n");
+        exit(1);
+    }
+    while (ret >= 0) {
+        ret = avcodec_receive_packet(enc_ctx, pkt);
+        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+            return;
+        else if (ret < 0) {
+            fprintf(stderr, "error during encoding\n");
+            exit(1);
+        }
+        printf("encoded frame %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
+        fwrite(pkt->data, 1, pkt->size, outfile);
+        av_packet_unref(pkt);
+    }
+}
+int generateVideo(filename, int width, int height, int fps, int bitRate, Config *config, u32 (*sfunc) (long double, long double, u32))
+{
+    const char *filename;
+    const AVCodec *codec;
+    AVCodecContext *c= NULL;
+    int i, ret, x, y;
+    FILE *f;
+    AVFrame *picture;
+    AVPacket *pkt;
+    uint8_t endcode[] = { 0, 0, 1, 0xb7 };
+    if (argc <= 1) {
+        fprintf(stderr, "Usage: %s <output file>\n", argv[0]);
+        exit(0);
+    }
+    filename = argv[1];
+    avcodec_register_all();
+    /* find the mpeg1video encoder */
+    codec = avcodec_find_encoder(AV_CODEC_ID_MPEG1VIDEO);
+    if (!codec) {
+        fprintf(stderr, "codec not found\n");
+        exit(1);
+    }
+    c = avcodec_alloc_context3(codec);
+    picture = av_frame_alloc();
+    pkt = av_packet_alloc();
+    if (!pkt)
+        exit(1);
+
+    /* put sample parameters */
+    c->bit_rate = bitRate;
+
+    /* resolution must be a multiple of two */
+    if ((width*height)%2)
+    	exit(1);
+    c->width = width;
+    c->height = height;
+
+    /* frames per second */
+    c->time_base = (AVRational){1, fps};
+    c->framerate = (AVRational){fps, 1};
+
+    /* emit one intra frame every ten frames */
+    c->gop_size = 10;
+    c->max_b_frames=1;
+    c->pix_fmt = AV_PIX_FMT_RGBA;
+    /* open it */
+
+    if (avcodec_open2(c, codec, NULL) < 0) {
+        fprintf(stderr, "could not open codec\n");
+        exit(1);
+    }
+    f = fopen(filename, "wb");
+    if (!f) {
+        fprintf(stderr, "could not open %s\n", filename);
+        exit(1);
+    }
+    picture->format = c->pix_fmt;
+    picture->width  = c->width;
+    picture->height = c->height;
+    ret = av_frame_get_buffer(picture, 32);
+    if (ret < 0) {
+        fprintf(stderr, "could not alloc the frame data\n");
+        exit(1);
+    }
+
+
+    /* encode 1 second of video */
+    x_min_s = -2.0;
+   	x_max_s = 1.0;
+   	y_min_s= -1.0;
+    y_max_s = 1.0;
+    x_min = x_min_s;
+    x_max = x_max_s;
+    y_min = y_min_s;
+    y_max = y_max_s;
+    _config = config;
+    _sfunc = sfunc;
+    for(i=0;i<25;i++) {
+        fflush(stdout);
+        /* make sure the frame data is writable */
+        ret = av_frame_make_writable(picture);
+        if (ret < 0)
+            exit(1);
+
+
+		s_arr = (u32 *) malloc((_config->width) * (_config->height) * sizeof(u32));
+		calculate(x_min, y_min, x_max, y_max, _sfunc, s_arr);
+		picture->data[0] = s_arr;
+
+        /* prepare a dummy image */
+        /* Y */
+        /*for(y=0;y<c->height;y++) {
+            for(x=0;x<c->width;x++) {
+                picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
+            }
+        }  YCbCr colorCode
+        /* Cb and Cr *
+        for(y=0;y<c->height/2;y++) {
+            for(x=0;x<c->width/2;x++) {
+                picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
+                picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
+            }
+        } */
+        picture->pts = i;
+        /* encode the image */
+        encode(c, picture, pkt, f);
+    }
+    /* flush the encoder */
+    encode(c, NULL, pkt, f);
+    /* add sequence end code to have a real MPEG file */
+    fwrite(endcode, 1, sizeof(endcode), f);
+    fclose(f);
+    avcodec_free_context(&c);
+    av_frame_free(&picture);
+    av_packet_free(&pkt);
+    return 0;
+}
-- 
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