1 files changed, 114 insertions, 0 deletions
diff --git a/doc/sample2.c b/doc/sample2.c
new file mode 100644
index 0000000..71f808c
--- /dev/null
+++ b/doc/sample2.c
@@ -0,0 +1,114 @@
+/*
+ * sample2.c
+ * Copyright (C) 2003      Regis Duchesne <hpreg@zoy.org>
+ * Copyright (C) 2000-2003 Michel Lespinasse <walken@zoy.org>
+ * Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
+ *
+ * This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
+ * See http://libmpeg2.sourceforge.net/ for updates.
+ *
+ * mpeg2dec is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpeg2dec is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ * This program reads a MPEG-2 stream, and saves each of its frames as
+ * an image file using the PPM format (color).
+ *
+ * It demonstrates how to use the following features of libmpeg2:
+ * - Output buffers use the RGB 24-bit chunky format.
+ * - Output buffers are allocated and managed by the library.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <inttypes.h>
+
+#include "mpeg2.h"
+#include "mpeg2convert.h"
+
+static void save_ppm (int width, int height, uint8_t * buf, int num)
+{
+    char filename[100];
+    FILE * ppmfile;
+
+    sprintf (filename, "%d.ppm", num);
+    ppmfile = fopen (filename, "wb");
+    if (!ppmfile) {
+	fprintf (stderr, "Could not open file \"%s\".\n", filename);
+	exit (1);
+    }
+    fprintf (ppmfile, "P6\n%d %d\n255\n", width, height);
+    fwrite (buf, 3 * width, height, ppmfile);
+    fclose (ppmfile);
+}
+
+static void sample2 (FILE * mpgfile)
+{
+#define BUFFER_SIZE 4096
+    uint8_t buffer[BUFFER_SIZE];
+    mpeg2dec_t * decoder;
+    const mpeg2_info_t * info;
+    mpeg2_state_t state;
+    size_t size;
+    int framenum = 0;
+
+    decoder = mpeg2_init ();
+    if (decoder == NULL) {
+	fprintf (stderr, "Could not allocate a decoder object.\n");
+	exit (1);
+    }
+    info = mpeg2_info (decoder);
+
+    size = (size_t)-1;
+    do {
+	state = mpeg2_parse (decoder);
+	switch (state) {
+	case STATE_BUFFER:
+	    size = fread (buffer, 1, BUFFER_SIZE, mpgfile);
+	    mpeg2_buffer (decoder, buffer, buffer + size);
+	    break;
+	case STATE_SEQUENCE:
+	    mpeg2_convert (decoder, mpeg2convert_rgb24, NULL);
+	    break;
+	case STATE_SLICE:
+	case STATE_END:
+	case STATE_INVALID_END:
+	    if (info->display_fbuf)
+		save_ppm (info->sequence->width, info->sequence->height,
+			  info->display_fbuf->buf[0], framenum++);
+	    break;
+	default:
+	    break;
+	}
+    } while (size);
+
+    mpeg2_close (decoder);
+}
+
+int main (int argc, char ** argv)
+{
+    FILE * mpgfile;
+
+    if (argc > 1) {
+	mpgfile = fopen (argv[1], "rb");
+	if (!mpgfile) {
+	    fprintf (stderr, "Could not open file \"%s\".\n", argv[1]);
+	    exit (1);
+	}
+    } else
+	mpgfile = stdin;
+
+    sample2 (mpgfile);
+
+    return 0;
+}