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#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 length, 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<length*fps;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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