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/*
* mpeg.c:
*
* See the main source file 'xineliboutput.c' for copyright information and
* how to reach the author.
*
* $Id: mpeg.c,v 1.2 2008-06-11 15:51:19 phintuka Exp $
*
*/
#include "mpeg.h"
const char * const picture_type_str[] = {
"(none)",
"I-Frame",
"B-Frame",
"P-Frame"
};
int mpeg2_get_picture_type(const uint8_t *buf, int len)
{
int i;
for (i = 0; i < len-5; i++) {
if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1) {
switch (buf[i + 3]) {
case SC_PICTURE:
return (buf[i + 5] >> 3) & 0x07;
}
}
}
return NO_PICTURE;
}
int mpeg2_get_video_size(const uint8_t *buf, int len, video_size_t *size)
{
int i;
for (i = 0; i < len-6; i++) {
if (buf[i] == 0 && buf[i + 1] == 0 && buf[i + 2] == 1) {
if (buf[i + 3] == SC_SEQUENCE) {
static const mpeg_rational_t mpeg2_aspect[16] = {
{0,1}, {1,1}, {4,3}, {16,9}, {221,100},
{0,1}, {0,1}, {0,1}, { 0,1}, { 0,1},
{0,1}, {0,1}, {0,1}, { 0,1}, { 0,1},
{0,1},
};
int d = (buf[i+4] << 16) | (buf[i+5] << 8) | buf[i+6];
int a = buf[i+7] >> 4;
size->width = (d >> 12);
size->height = (d & 0xfff);
memcpy(&size->pixel_aspect, &mpeg2_aspect[a], sizeof(mpeg_rational_t));
size->pixel_aspect.num *= size->height;
size->pixel_aspect.den *= size->width;
return 1;
}
}
}
return 0;
}
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