--- /dev/null
+#include <iostream>
+extern "C" {
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libswscale/swscale.h>
+}
+
+using namespace std;
+
+char const video[] = "./starwars.mpg";//Ghostbusters.avi";
+
+static void
+save_frame (AVFrame *frame, int width, int height, int N)
+{
+ char filename[32];
+
+ sprintf (filename, "frame%d.ppm", N);
+ FILE* file = fopen (filename, "wb");
+ if (file == NULL) {
+ return;
+ }
+
+ fprintf (file, "P6\n%d %d\n255\n", width, height);
+
+ for (int y = 0; y < height; y++) {
+ fwrite (frame->data[0] + y * frame->linesize[0], 1, width * 3, file);
+ }
+
+ fclose (file);
+}
+
+int
+main (int argc, char* argv[])
+{
+ av_register_all ();
+
+ AVFormatContext* format_context = NULL;
+ if (avformat_open_input (&format_context, video, NULL, NULL) != 0) {
+ fprintf (stderr, "avformat_open_input failed.\n");
+ return -1;
+ }
+
+ if (avformat_find_stream_info (format_context, NULL) < 0) {
+ fprintf (stderr, "av_find_stream_info failed.\n");
+ return -1;
+ }
+
+ av_dump_format (format_context, 0, video, 0);
+
+ int video_stream = -1;
+ for (uint32_t i = 0; i < format_context->nb_streams; ++i) {
+ if (format_context->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
+ video_stream = i;
+ break;
+ }
+ }
+
+ AVCodecContext* decoder_context = format_context->streams[video_stream]->codec;
+
+ AVCodec* decoder = avcodec_find_decoder (decoder_context->codec_id);
+ if (decoder == NULL) {
+ fprintf (stderr, "avcodec_find_decoder failed.\n");
+ return -1;
+ }
+
+ if (avcodec_open2 (decoder_context, decoder, NULL) < 0) {
+ fprintf (stderr, "avcodec_open failed.\n");
+ return -1;
+ }
+
+ /* XXX */
+ if (decoder_context->time_base.num > 1000 && decoder_context->time_base.den == 1) {
+ decoder_context->time_base.den = 1000;
+ }
+
+ AVCodec* encoder = avcodec_find_encoder (CODEC_ID_JPEG2000);
+ if (encoder == NULL) {
+ cerr << "avcodec_find_encoder failed.\n";
+ return -1;
+ }
+
+ AVCodecContext* encoder_context = avcodec_alloc_context3 (encoder);
+
+ cout << decoder_context->width << " x " << decoder_context->height << "\n";
+ encoder_context->width = decoder_context->width;
+ encoder_context->height = decoder_context->height;
+ /* XXX */
+ encoder_context->time_base = (AVRational) {1, 25};
+ encoder_context->pix_fmt = PIX_FMT_YUV420P;
+ encoder_context->compression_level = 0;
+
+ if (avcodec_open2 (encoder_context, encoder, NULL) < 0) {
+ cerr << "avcodec_open failed.\n";
+ return -1;
+ }
+
+ AVFrame* frame = avcodec_alloc_frame ();
+
+ AVFrame* frame_RGB = avcodec_alloc_frame ();
+ if (frame_RGB == NULL) {
+ fprintf (stderr, "avcodec_alloc_frame failed.\n");
+ return -1;
+ }
+
+ FILE* outfile = fopen ("output", "wb");
+
+ int num_bytes = avpicture_get_size (PIX_FMT_RGB24, decoder_context->width, decoder_context->height);
+ uint8_t* buffer = (uint8_t *) malloc (num_bytes);
+
+ avpicture_fill ((AVPicture *) frame_RGB, buffer, PIX_FMT_RGB24, decoder_context->width, decoder_context->height);
+
+ /* alloc image and output buffer */
+ int outbuf_size = 100000;
+ uint8_t* outbuf = (uint8_t *) malloc (outbuf_size);
+ int out_size = 0;
+
+ AVPacket packet;
+ int i = 0;
+ while (av_read_frame (format_context, &packet) >= 0) {
+
+ int frame_finished;
+
+ if (packet.stream_index == video_stream) {
+ avcodec_decode_video2 (decoder_context, frame, &frame_finished, &packet);
+
+ if (frame_finished) {
+ static struct SwsContext *img_convert_context;
+
+ if (img_convert_context == NULL) {
+ int w = decoder_context->width;
+ int h = decoder_context->height;
+
+ img_convert_context = sws_getContext (
+ w, h,
+ decoder_context->pix_fmt,
+ w, h, PIX_FMT_RGB24, SWS_BICUBIC,
+ NULL, NULL, NULL
+ );
+
+ if (img_convert_context == NULL) {
+ fprintf (stderr, "sws_getContext failed.\n");
+ return -1;
+ }
+ }
+
+ sws_scale (
+ img_convert_context, frame->data, frame->linesize, 0,
+ decoder_context->height, frame_RGB->data, frame_RGB->linesize
+ );
+
+ out_size = avcodec_encode_video (encoder_context, outbuf, outbuf_size, frame);
+ ++i;
+ if (i == 200) {
+ fwrite (outbuf, 1, out_size, outfile);
+ }
+ }
+ }
+
+ av_free_packet (&packet);
+ }
+
+ while (out_size) {
+ out_size = avcodec_encode_video (encoder_context, outbuf, outbuf_size, NULL);
+ fwrite (outbuf, 1, out_size, outfile);
+ }
+
+ fclose (outfile);
+ free (buffer);
+ av_free (frame_RGB);
+ av_free (frame);
+ avcodec_close (decoder_context);
+ avcodec_close (encoder_context);
+ avformat_close_input (&format_context);
+
+ return 0;
+}