mirror of https://github.com/mpv-player/mpv
377 lines
9.9 KiB
C
377 lines
9.9 KiB
C
|
|
// based on libmpeg2/header.c by Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
|
|
|
|
#include <inttypes.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
|
|
#include "config.h"
|
|
#include "mpeg_hdr.h"
|
|
|
|
static int frameratecode2framerate[16] = {
|
|
0,
|
|
// Official mpeg1/2 framerates: (1-8)
|
|
24000*10000/1001, 24*10000,25*10000,
|
|
30000*10000/1001, 30*10000,50*10000,
|
|
60000*10000/1001, 60*10000,
|
|
// Xing's 15fps: (9)
|
|
15*10000,
|
|
// libmpeg3's "Unofficial economy rates": (10-13)
|
|
5*10000,10*10000,12*10000,15*10000,
|
|
// some invalid ones: (14-15)
|
|
0,0
|
|
};
|
|
|
|
|
|
int mp_header_process_sequence_header (mp_mpeg_header_t * picture, unsigned char * buffer)
|
|
{
|
|
int width, height;
|
|
|
|
if ((buffer[6] & 0x20) != 0x20){
|
|
fprintf(stderr, "missing marker bit!\n");
|
|
return 1; /* missing marker_bit */
|
|
}
|
|
|
|
height = (buffer[0] << 16) | (buffer[1] << 8) | buffer[2];
|
|
|
|
picture->display_picture_width = (height >> 12);
|
|
picture->display_picture_height = (height & 0xfff);
|
|
|
|
width = ((height >> 12) + 15) & ~15;
|
|
height = ((height & 0xfff) + 15) & ~15;
|
|
|
|
picture->aspect_ratio_information = buffer[3] >> 4;
|
|
picture->frame_rate_code = buffer[3] & 15;
|
|
picture->fps=frameratecode2framerate[picture->frame_rate_code];
|
|
picture->bitrate = (buffer[4]<<10)|(buffer[5]<<2)|(buffer[6]>>6);
|
|
picture->mpeg1 = 1;
|
|
picture->picture_structure = 3; //FRAME_PICTURE;
|
|
picture->display_time=100;
|
|
return 0;
|
|
}
|
|
|
|
static int header_process_sequence_extension (mp_mpeg_header_t * picture,
|
|
unsigned char * buffer)
|
|
{
|
|
/* check chroma format, size extensions, marker bit */
|
|
|
|
if ( ((buffer[1] & 0x06) == 0x00) ||
|
|
((buffer[1] & 0x01) != 0x00) || (buffer[2] & 0xe0) ||
|
|
((buffer[3] & 0x01) != 0x01) )
|
|
return 1;
|
|
|
|
picture->progressive_sequence = (buffer[1] >> 3) & 1;
|
|
picture->mpeg1 = 0;
|
|
return 0;
|
|
}
|
|
|
|
static int header_process_picture_coding_extension (mp_mpeg_header_t * picture, unsigned char * buffer)
|
|
{
|
|
picture->picture_structure = buffer[2] & 3;
|
|
picture->top_field_first = buffer[3] >> 7;
|
|
picture->repeat_first_field = (buffer[3] >> 1) & 1;
|
|
picture->progressive_frame = buffer[4] >> 7;
|
|
|
|
// repeat_first implementation by A'rpi/ESP-team, based on libmpeg3:
|
|
picture->display_time=100;
|
|
if(picture->repeat_first_field){
|
|
if(picture->progressive_sequence){
|
|
if(picture->top_field_first)
|
|
picture->display_time+=200;
|
|
else
|
|
picture->display_time+=100;
|
|
} else
|
|
if(picture->progressive_frame){
|
|
picture->display_time+=50;
|
|
}
|
|
}
|
|
//temopral hack. We calc time on every field, so if we have 2 fields
|
|
// interlaced we'll end with double time for 1 frame
|
|
if( picture->picture_structure!=3 ) picture->display_time/=2;
|
|
return 0;
|
|
}
|
|
|
|
int mp_header_process_extension (mp_mpeg_header_t * picture, unsigned char * buffer)
|
|
{
|
|
switch (buffer[0] & 0xf0) {
|
|
case 0x10: /* sequence extension */
|
|
return header_process_sequence_extension (picture, buffer);
|
|
case 0x80: /* picture coding extension */
|
|
return header_process_picture_coding_extension (picture, buffer);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
|
|
//MPEG4 HEADERS
|
|
unsigned char mp_getbits(unsigned char *buffer, unsigned int from, unsigned char len)
|
|
{
|
|
unsigned int n;
|
|
unsigned char m, u, l, y;
|
|
|
|
n = from / 8;
|
|
m = from % 8;
|
|
u = 8 - m;
|
|
l = (len > u ? len - u : 0);
|
|
|
|
y = (buffer[n] << m);
|
|
if(8 > len)
|
|
y >>= (8-len);
|
|
if(l)
|
|
y |= (buffer[n+1] >> (8-l));
|
|
|
|
//fprintf(stderr, "GETBITS(%d -> %d): bytes=0x%x 0x%x, n=%d, m=%d, l=%d, u=%d, Y=%d\n",
|
|
// from, (int) len, (int) buffer[n],(int) buffer[n+1], n, (int) m, (int) l, (int) u, (int) y);
|
|
return y;
|
|
}
|
|
|
|
#define getbits mp_getbits
|
|
|
|
static int read_timeinc(mp_mpeg_header_t * picture, unsigned char * buffer, int n)
|
|
{
|
|
if(picture->timeinc_bits > 8) {
|
|
picture->timeinc_unit = getbits(buffer, n, picture->timeinc_bits - 8) << 8;
|
|
n += picture->timeinc_bits - 8;
|
|
picture->timeinc_unit |= getbits(buffer, n, 8);
|
|
n += 8;
|
|
} else {
|
|
picture->timeinc_unit = getbits(buffer, n, picture->timeinc_bits);
|
|
n += picture->timeinc_bits;
|
|
}
|
|
//fprintf(stderr, "TIMEINC2: %d, bits: %d\n", picture->timeinc_unit, picture->timeinc_bits);
|
|
return n;
|
|
}
|
|
|
|
int mp4_header_process_vol(mp_mpeg_header_t * picture, unsigned char * buffer)
|
|
{
|
|
unsigned int n, aspect=0, aspectw=0, aspecth=0, x=1, v;
|
|
|
|
//begins with 0x0000012x
|
|
picture->fps = 0;
|
|
picture->timeinc_bits = picture->timeinc_resolution = picture->timeinc_unit = 0;
|
|
n = 9;
|
|
if(getbits(buffer, n, 1))
|
|
n += 7;
|
|
n++;
|
|
aspect=getbits(buffer, n, 4);
|
|
n += 4;
|
|
if(aspect == 0x0f) {
|
|
aspectw = getbits(buffer, n, 8);
|
|
n += 8;
|
|
aspecth = getbits(buffer, n, 8);
|
|
n += 8;
|
|
}
|
|
|
|
if(getbits(buffer, n, 1)) {
|
|
n += 4;
|
|
if(getbits(buffer, n, 1))
|
|
n += 79;
|
|
n++;
|
|
} else n++;
|
|
|
|
n+=3;
|
|
|
|
picture->timeinc_resolution = getbits(buffer, n, 8) << 8;
|
|
n += 8;
|
|
picture->timeinc_resolution |= getbits(buffer, n, 8);
|
|
n += 8;
|
|
|
|
picture->timeinc_bits = 0;
|
|
v = picture->timeinc_resolution - 1;
|
|
while(v && (x<16)) {
|
|
v>>=1;
|
|
picture->timeinc_bits++;
|
|
}
|
|
picture->timeinc_bits = (picture->timeinc_bits > 1 ? picture->timeinc_bits : 1);
|
|
|
|
n++; //marker bit
|
|
|
|
if(getbits(buffer, n, 1)) { //fixed_vop_timeinc
|
|
n++;
|
|
n = read_timeinc(picture, buffer, n);
|
|
|
|
if(picture->timeinc_unit)
|
|
picture->fps = (picture->timeinc_resolution * 10000) / picture->timeinc_unit;
|
|
}
|
|
|
|
//fprintf(stderr, "ASPECT: %d, PARW=%d, PARH=%d, TIMEINCRESOLUTION: %d, FIXED_TIMEINC: %d (number of bits: %d), FPS: %u\n",
|
|
// aspect, aspectw, aspecth, picture->timeinc_resolution, picture->timeinc_unit, picture->timeinc_bits, picture->fps);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void mp4_header_process_vop(mp_mpeg_header_t * picture, unsigned char * buffer)
|
|
{
|
|
int n;
|
|
n = 0;
|
|
picture->picture_type = getbits(buffer, n, 2);
|
|
n += 2;
|
|
while(getbits(buffer, n, 1))
|
|
n++;
|
|
n++;
|
|
getbits(buffer, n, 1);
|
|
n++;
|
|
n = read_timeinc(picture, buffer, n);
|
|
}
|
|
|
|
#define min(a, b) ((a) <= (b) ? (a) : (b))
|
|
|
|
static unsigned int read_golomb(unsigned char *buffer, unsigned int *init)
|
|
{
|
|
unsigned int x, v = 0, v2 = 0, m, len = 0, n = *init;
|
|
|
|
while(getbits(buffer, n++, 1) == 0)
|
|
len++;
|
|
|
|
x = len + n;
|
|
while(n < x)
|
|
{
|
|
m = min(x - n, 8);
|
|
v |= getbits(buffer, n, m);
|
|
n += m;
|
|
if(x - n > 8)
|
|
v <<= 8;
|
|
}
|
|
|
|
v2 = 1;
|
|
for(n = 0; n < len; n++)
|
|
v2 <<= 1;
|
|
v2 = (v2 - 1) + v;
|
|
|
|
//fprintf(stderr, "READ_GOLOMB(%u), V=2^%u + %u-1 = %u\n", *init, len, v, v2);
|
|
*init = x;
|
|
return v2;
|
|
}
|
|
|
|
|
|
static int h264_parse_vui(mp_mpeg_header_t * picture, unsigned char * buf, unsigned int n)
|
|
{
|
|
unsigned int overscan, vsp_color, chroma, timing, fixed_fps;
|
|
|
|
if(getbits(buf, n++, 1))
|
|
{
|
|
picture->aspect_ratio_information = getbits(buf, n, 8);
|
|
n += 8;
|
|
if(picture->aspect_ratio_information == 255)
|
|
{
|
|
picture->display_picture_width = (getbits(buf, n, 8) << 8) | getbits(buf, n + 8, 8);
|
|
n += 16;
|
|
|
|
picture->display_picture_height = (getbits(buf, n, 8) << 8) | getbits(buf, n + 8, 8);
|
|
n += 16;
|
|
}
|
|
}
|
|
|
|
if((overscan=getbits(buf, n++, 1)))
|
|
n++;
|
|
if((vsp_color=getbits(buf, n++, 1)))
|
|
{
|
|
n += 4;
|
|
if(getbits(buf, n++, 1))
|
|
n += 24;
|
|
}
|
|
if((chroma=getbits(buf, n++, 1)))
|
|
{
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
}
|
|
if((timing=getbits(buf, n++, 1)))
|
|
{
|
|
picture->timeinc_unit = (getbits(buf, n, 8) << 24) | (getbits(buf, n+8, 8) << 16) | (getbits(buf, n+16, 8) << 8) | getbits(buf, n+24, 8);
|
|
n += 32;
|
|
|
|
picture->timeinc_resolution = (getbits(buf, n, 8) << 24) | (getbits(buf, n+8, 8) << 16) | (getbits(buf, n+16, 8) << 8) | getbits(buf, n+24, 8);
|
|
n += 32;
|
|
|
|
fixed_fps = getbits(buf, n, 1);
|
|
|
|
if(picture->timeinc_unit > 0 && picture->timeinc_resolution > 0)
|
|
picture->fps = ((uint64_t)picture->timeinc_resolution * 10000) / picture->timeinc_unit;
|
|
}
|
|
|
|
//fprintf(stderr, "H264_PARSE_VUI, OVESCAN=%u, VSP_COLOR=%u, CHROMA=%u, TIMING=%u, DISPW=%u, DISPH=%u, TIMERES=%u, TIMEINC=%u, FIXED_FPS=%u\n", overscan, vsp_color, chroma, timing, picture->display_picture_width, picture->display_picture_height,
|
|
// picture->timeinc_resolution, picture->timeinc_unit, picture->timeinc_unit, fixed_fps);
|
|
|
|
return n;
|
|
}
|
|
|
|
int h264_parse_sps(mp_mpeg_header_t * picture, unsigned char * buf, int len)
|
|
{
|
|
unsigned int n = 0, v, i, j, mbh;
|
|
unsigned char *dest;
|
|
int frame_mbs_only;
|
|
|
|
dest = (unsigned char*) malloc(len);
|
|
if(! dest)
|
|
return 0;
|
|
j = i = 0;
|
|
while(i <= len-3)
|
|
{
|
|
if(buf[i] == 0 && buf[i+1] == 0 && buf[i+2] == 3)
|
|
{
|
|
dest[j] = dest[j+1] = 0;
|
|
j += 2;
|
|
i += 3;
|
|
}
|
|
else
|
|
{
|
|
dest[j] = buf[i];
|
|
j++;
|
|
i++;
|
|
}
|
|
}
|
|
dest[j] = buf[len-2];
|
|
dest[j+1] = buf[len-1];
|
|
j += 2;
|
|
len = j+1;
|
|
buf = dest;
|
|
|
|
picture->fps = picture->timeinc_unit = picture->timeinc_resolution = 0;
|
|
n = 24;
|
|
read_golomb(buf, &n);
|
|
if(buf[0] >= 100){
|
|
if(read_golomb(buf, &n) == 3)
|
|
n++;
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
n++;
|
|
if(getbits(buf, n++, 1)){
|
|
//FIXME scaling matrix
|
|
}
|
|
}
|
|
read_golomb(buf, &n);
|
|
v = read_golomb(buf, &n);
|
|
if(v == 0)
|
|
read_golomb(buf, &n);
|
|
else if(v == 1)
|
|
{
|
|
getbits(buf, n++, 1);
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
v = read_golomb(buf, &n);
|
|
for(i = 0; i < v; i++)
|
|
read_golomb(buf, &n);
|
|
}
|
|
read_golomb(buf, &n);
|
|
getbits(buf, n++, 1);
|
|
picture->display_picture_width = 16 *(read_golomb(buf, &n)+1);
|
|
mbh = read_golomb(buf, &n)+1;
|
|
frame_mbs_only = getbits(buf, n++, 1);
|
|
picture->display_picture_height = 16 * (2 - frame_mbs_only) * mbh;
|
|
if(!frame_mbs_only)
|
|
getbits(buf, n++, 1);
|
|
getbits(buf, n++, 1);
|
|
if(getbits(buf, n++, 1))
|
|
{
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
read_golomb(buf, &n);
|
|
}
|
|
if(getbits(buf, n++, 1))
|
|
n = h264_parse_vui(picture, buf, n);
|
|
|
|
free(dest);
|
|
return n;
|
|
}
|