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AVRational

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sample_aspect_ratio
aspect ratio in JPEG JFIF is SAR not DAR !
removed nonsense SAR guessing code
various related cleanups
bugs?

Originally committed as revision 2403 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2003-10-20 20:23:46 +00:00
parent 9dad924e22
commit 5ff85f1d8b
20 changed files with 215 additions and 183 deletions
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4
ffmpeg.c
View File

@ -2078,7 +2078,7 @@ static void opt_input_file(const char *filename)
case CODEC_TYPE_VIDEO:
frame_height = enc->height;
frame_width = enc->width;
frame_aspect_ratio = enc->aspect_ratio;
frame_aspect_ratio = av_q2d(enc->sample_aspect_ratio) * enc->width / enc->height;
frame_pix_fmt = enc->pix_fmt;
rfps = ic->streams[i]->r_frame_rate;
rfps_base = ic->streams[i]->r_frame_rate_base;
@ -2239,7 +2239,7 @@ static void opt_output_file(const char *filename)
video_enc->width = frame_width;
video_enc->height = frame_height;
video_enc->aspect_ratio = frame_aspect_ratio;
video_enc->sample_aspect_ratio = av_d2q(frame_aspect_ratio*frame_height/frame_width, 30000);
video_enc->pix_fmt = frame_pix_fmt;
if (!intra_only)

3
ffplay.c
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@ -330,7 +330,8 @@ static void video_image_display(VideoState *is)
vp = &is->pictq[is->pictq_rindex];
if (vp->bmp) {
/* XXX: use variable in the frame */
aspect_ratio = is->video_st->codec.aspect_ratio;
aspect_ratio = av_q2d(is->video_st->codec.sample_aspect_ratio)
* is->video_st->codec.width / is->video_st->codec.height;;
if (aspect_ratio <= 0.0)
aspect_ratio = (float)is->video_st->codec.width /
(float)is->video_st->codec.height;

2
libavcodec/Makefile
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@ -18,7 +18,7 @@ OBJS= common.o utils.o mem.o allcodecs.o \
fft.o mdct.o mace.o huffyuv.o cyuv.o opts.o raw.o h264.o golomb.o \
vp3.o asv1.o 4xm.o cabac.o ffv1.o ra144.o ra288.o vcr1.o cljr.o \
roqvideo.o dpcm.o interplayvideo.o xan.o rpza.o cinepak.o msrle.o \
msvideo1.o vqavideo.o idcinvideo.o adx.o
msvideo1.o vqavideo.o idcinvideo.o adx.o rational.o
ifeq ($(AMR_NB),yes)
ifeq ($(AMR_NB_FIXED),yes)

7
libavcodec/avcodec.h
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@ -12,10 +12,11 @@ extern "C" {
#endif
#include "common.h"
#include "rational.h"
#define FFMPEG_VERSION_INT 0x000408
#define FFMPEG_VERSION "0.4.8"
#define LIBAVCODEC_BUILD 4686
#define LIBAVCODEC_BUILD 4687
#define LIBAVCODEC_VERSION_INT FFMPEG_VERSION_INT
#define LIBAVCODEC_VERSION FFMPEG_VERSION
@ -1034,11 +1035,11 @@ typedef struct AVCodecContext {
#define FF_PRED_MEDIAN 2
/**
* aspect ratio (0 if unknown).
* sample aspect ratio (0 if unknown).
* - encoding: set by user.
* - decoding: set by lavc.
*/
float aspect_ratio;
AVRational sample_aspect_ratio;
/**
* the picture in the bitstream.

26
libavcodec/common.c
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@ -386,29 +386,3 @@ int64_t ff_gcd(int64_t a, int64_t b){
if(b) return ff_gcd(b, a%b);
else return a;
}
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max){
double best_diff=1E10, diff;
int best_denom=1, best_nom=1;
int nom, denom, gcd;
//brute force here, perhaps we should try continued fractions if we need large max ...
for(denom=1; denom<=max; denom++){
nom= (int)(f*denom + 0.5);
if(nom<=0 || nom>max) continue;
diff= ABS( f - (double)nom / (double)denom );
if(diff < best_diff){
best_diff= diff;
best_nom= nom;
best_denom= denom;
}
}
gcd= ff_gcd(best_nom, best_denom);
best_nom /= gcd;
best_denom /= gcd;
*nom_arg= best_nom;
*denom_arg= best_denom;
}

3
libavcodec/common.h
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@ -1056,9 +1056,6 @@ static inline int ff_get_fourcc(const char *s){
#define MKBETAG(a,b,c,d) (d | (c << 8) | (b << 16) | (a << 24))
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
#ifdef ARCH_X86
#define MASK_ABS(mask, level)\
asm volatile(\

44
libavcodec/h263.c
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@ -131,19 +131,13 @@ int h263_get_picture_format(int width, int height)
#ifdef CONFIG_ENCODERS
static void float_aspect_to_info(MpegEncContext * s, float aspect){
static void aspect_to_info(MpegEncContext * s, AVRational aspect){
int i;
aspect*= s->height/(double)s->width;
//printf("%f\n", aspect);
if(aspect==0) aspect= 1.0;
if(aspect.num==0) aspect= (AVRational){1,1};
ff_float2fraction(&s->aspected_width, &s->aspected_height, aspect, 255);
//printf("%d %d\n", s->aspected_width, s->aspected_height);
for(i=1; i<6; i++){
if(s->aspected_width == pixel_aspect[i][0] && s->aspected_height== pixel_aspect[i][1]){
if(av_cmp_q(pixel_aspect[i], aspect) == 0){
s->aspect_ratio_info=i;
return;
}
@ -270,16 +264,15 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
if (format == 7) {
/* Custom Picture Format (CPFMT) */
float_aspect_to_info(s, s->avctx->aspect_ratio);
aspect_to_info(s, s->avctx->sample_aspect_ratio);
put_bits(&s->pb,4,s->aspect_ratio_info);
put_bits(&s->pb,9,(s->width >> 2) - 1);
put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
put_bits(&s->pb,9,(s->height >> 2));
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
{
put_bits(&s->pb, 8, s->aspected_width);
put_bits(&s->pb, 8, s->aspected_height);
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
}
}
@ -1949,13 +1942,12 @@ static void mpeg4_encode_vol_header(MpegEncContext * s, int vo_number, int vol_n
put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
put_bits(&s->pb, 3, 1); /* is obj layer priority */
float_aspect_to_info(s, s->avctx->aspect_ratio);
aspect_to_info(s, s->avctx->sample_aspect_ratio);
put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
{
put_bits(&s->pb, 8, s->aspected_width);
put_bits(&s->pb, 8, s->aspected_height);
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED){
put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.num);
put_bits(&s->pb, 8, s->avctx->sample_aspect_ratio.den);
}
if(s->low_delay){
@ -4341,11 +4333,10 @@ int h263_decode_picture_header(MpegEncContext *s)
dprintf("\nH.263+ Custom picture: %dx%d\n",width,height);
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED) {
/* aspected dimensions */
s->aspected_width = get_bits(&s->gb, 8);
s->aspected_height = get_bits(&s->gb, 8);
s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 8);
s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 8);
}else{
s->aspected_width = pixel_aspect[s->aspect_ratio_info][0];
s->aspected_height= pixel_aspect[s->aspect_ratio_info][1];
s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
}
} else {
width = h263_format[format][0];
@ -4632,11 +4623,10 @@ static int decode_vol_header(MpegEncContext *s, GetBitContext *gb){
//printf("vo type:%d\n",s->vo_type);
s->aspect_ratio_info= get_bits(gb, 4);
if(s->aspect_ratio_info == FF_ASPECT_EXTENDED){
s->aspected_width = get_bits(gb, 8); // par_width
s->aspected_height = get_bits(gb, 8); // par_height
s->avctx->sample_aspect_ratio.num= get_bits(gb, 8); // par_width
s->avctx->sample_aspect_ratio.den= get_bits(gb, 8); // par_height
}else{
s->aspected_width = pixel_aspect[s->aspect_ratio_info][0];
s->aspected_height= pixel_aspect[s->aspect_ratio_info][1];
s->avctx->sample_aspect_ratio= pixel_aspect[s->aspect_ratio_info];
}
if ((s->vol_control_parameters=get_bits1(gb))) { /* vol control parameter */

9
libavcodec/h263dec.c
View File

@ -393,7 +393,6 @@ int ff_h263_decode_frame(AVCodecContext *avctx,
MpegEncContext *s = avctx->priv_data;
int ret;
AVFrame *pict = data;
float new_aspect;
#ifdef PRINT_FRAME_TIME
uint64_t time= rdtsc();
@ -602,13 +601,8 @@ retry:
/* and other parameters. So then we could init the picture */
/* FIXME: By the way H263 decoder is evolving it should have */
/* an H263EncContext */
if(s->aspected_height)
new_aspect= s->aspected_width*s->width / (float)(s->height*s->aspected_height);
else
new_aspect=0;
if ( s->width != avctx->width || s->height != avctx->height
|| ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
if ( s->width != avctx->width || s->height != avctx->height) {
/* H.263 could change picture size any time */
ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
s->parse_context.buffer=0;
@ -618,7 +612,6 @@ retry:
if (!s->context_initialized) {
avctx->width = s->width;
avctx->height = s->height;
avctx->aspect_ratio= new_aspect;
goto retry;
}

25
libavcodec/h264.c
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@ -79,8 +79,7 @@ typedef struct SPS{
int crop_top; ///< frame_cropping_rect_top_offset
int crop_bottom; ///< frame_cropping_rect_bottom_offset
int vui_parameters_present_flag;
int sar_width;
int sar_height;
AVRational sar;
short offset_for_ref_frame[256]; //FIXME dyn aloc?
}SPS;
@ -2829,7 +2828,6 @@ static int decode_slice_header(H264Context *h){
int first_mb_in_slice, pps_id;
int num_ref_idx_active_override_flag;
static const uint8_t slice_type_map[5]= {P_TYPE, B_TYPE, I_TYPE, SP_TYPE, SI_TYPE};
float new_aspect;
s->current_picture.reference= h->nal_ref_idc != 0;
@ -2881,14 +2879,8 @@ static int decode_slice_header(H264Context *h){
else
s->height= 16*s->mb_height - 4*(h->sps.crop_top + h->sps.crop_bottom); //FIXME recheck
if(s->aspected_height) //FIXME emms at end of slice ?
new_aspect= h->sps.sar_width*s->width / (float)(s->height*h->sps.sar_height);
else
new_aspect=0;
if (s->context_initialized
&& ( s->width != s->avctx->width || s->height != s->avctx->height
|| ABS(new_aspect - s->avctx->aspect_ratio) > 0.001)) {
&& ( s->width != s->avctx->width || s->height != s->avctx->height)) {
free_tables(h);
MPV_common_end(s);
}
@ -2900,7 +2892,7 @@ static int decode_slice_header(H264Context *h){
s->avctx->width = s->width;
s->avctx->height = s->height;
s->avctx->aspect_ratio= new_aspect;
s->avctx->sample_aspect_ratio= h->sps.sar;
}
if(first_mb_in_slice == 0){
@ -3736,18 +3728,17 @@ static inline int decode_vui_parameters(H264Context *h, SPS *sps){
if( aspect_ratio_info_present_flag ) {
aspect_ratio_idc= get_bits(&s->gb, 8);
if( aspect_ratio_idc == EXTENDED_SAR ) {
sps->sar_width= get_bits(&s->gb, 16);
sps->sar_height= get_bits(&s->gb, 16);
sps->sar.num= get_bits(&s->gb, 16);
sps->sar.den= get_bits(&s->gb, 16);
}else if(aspect_ratio_idc < 16){
sps->sar_width= pixel_aspect[aspect_ratio_idc][0];
sps->sar_height= pixel_aspect[aspect_ratio_idc][1];
sps->sar= pixel_aspect[aspect_ratio_idc];
}else{
fprintf(stderr, "illegal aspect ratio\n");
return -1;
}
}else{
sps->sar_width=
sps->sar_height= 0;
sps->sar.num=
sps->sar.den= 0;
}
// s->avctx->aspect_ratio= sar_width*s->width / (float)(s->height*sar_height);
#if 0

4
libavcodec/h264data.h
View File

@ -51,8 +51,8 @@
#define EXTENDED_SAR 255
static const uint16_t pixel_aspect[16][2]={
{0, 0},
static const AVRational pixel_aspect[14]={
{0, 1},
{1, 1},
{12, 11},
{10, 11},

51
libavcodec/mjpeg.c
View File

@ -381,28 +381,8 @@ static void jpeg_put_comments(MpegEncContext *s)
put_string(p, "JFIF"); /* this puts the trailing zero-byte too */
put_bits(p, 16, 0x0201); /* v 1.02 */
put_bits(p, 8, 0); /* units type: 0 - aspect ratio */
switch(s->aspect_ratio_info)
{
case FF_ASPECT_4_3_625:
case FF_ASPECT_4_3_525:
put_bits(p, 16, 4);
put_bits(p, 16, 3);
break;
case FF_ASPECT_16_9_625:
case FF_ASPECT_16_9_525:
put_bits(p, 16, 16);
put_bits(p, 16, 9);
break;
case FF_ASPECT_EXTENDED:
put_bits(p, 16, s->aspected_width);
put_bits(p, 16, s->aspected_height);
break;
case FF_ASPECT_SQUARE:
default:
put_bits(p, 16, 1); /* aspect: 1:1 */
put_bits(p, 16, 1);
break;
}
put_bits(p, 16, s->avctx->sample_aspect_ratio.num);
put_bits(p, 16, s->avctx->sample_aspect_ratio.den);
put_bits(p, 8, 0); /* thumbnail width */
put_bits(p, 8, 0); /* thumbnail height */
}
@ -1547,29 +1527,10 @@ static int mjpeg_decode_app(MJpegDecodeContext *s)
skip_bits(&s->gb, 8); /* the trailing zero-byte */
printf("mjpeg: JFIF header found (version: %x.%x)\n",
get_bits(&s->gb, 8), get_bits(&s->gb, 8));
if (get_bits(&s->gb, 8) == 0)
{
int x_density, y_density;
x_density = get_bits(&s->gb, 16);
y_density = get_bits(&s->gb, 16);
skip_bits(&s->gb, 8);
dprintf("x/y density: %d (%f), %d (%f)\n", x_density,
(float)x_density, y_density, (float)y_density);
#if 0
//MN: needs to be checked
if(x_density)
// s->avctx->aspect_ratio= s->width*y_density/((float)s->height*x_density);
s->avctx->aspect_ratio = (float)x_density/y_density;
/* it's better, but every JFIF I have seen stores 1:1 */
else
s->avctx->aspect_ratio= 0.0;
#endif
}
else
{
skip_bits(&s->gb, 16);
skip_bits(&s->gb, 16);
}
s->avctx->sample_aspect_ratio.num= get_bits(&s->gb, 16);
s->avctx->sample_aspect_ratio.den= get_bits(&s->gb, 16);
t_w = get_bits(&s->gb, 8);
t_h = get_bits(&s->gb, 8);
@ -2085,7 +2046,7 @@ static int sp5x_decode_frame(AVCodecContext *avctx,
memcpy(recoded+j, &sp5x_data_sos[0], sizeof(sp5x_data_sos));
j += sizeof(sp5x_data_sos);
for (i = 14; i < buf_size, j < buf_size+1024-2; i++)
for (i = 14; i < buf_size && j < buf_size+1024-2; i++)
{
recoded[j++] = buf[i];
if (buf[i] == 0xff)

29
libavcodec/mpeg12.c
View File

@ -190,10 +190,10 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
int n, i;
uint64_t time_code;
float best_aspect_error= 1E10;
float aspect_ratio= s->avctx->aspect_ratio;
float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio);
int constraint_parameter_flag;
if(aspect_ratio==0.0) aspect_ratio= s->width / (float)s->height; //pixel aspect 1:1 (VGA)
if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA)
if (s->current_picture.key_frame) {
/* mpeg1 header repeated every gop */
@ -219,7 +219,7 @@ static void mpeg1_encode_sequence_header(MpegEncContext *s)
put_bits(&s->pb, 12, s->height);
for(i=1; i<15; i++){
float error= mpeg1_aspect[i] - s->width/(s->height*aspect_ratio);
float error= mpeg1_aspect[i] - aspect_ratio;
error= ABS(error);
if(error < best_aspect_error){
@ -1742,7 +1742,6 @@ static void mpeg_decode_sequence_extension(MpegEncContext *s)
int bit_rate_ext, vbv_buf_ext;
int frame_rate_ext_n, frame_rate_ext_d;
int level, profile;
float aspect;
skip_bits(&s->gb, 1); /* profil and level esc*/
profile= get_bits(&s->gb, 3);
@ -1774,9 +1773,15 @@ static void mpeg_decode_sequence_extension(MpegEncContext *s)
s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO;
s->avctx->sub_id = 2; /* indicates mpeg2 found */
aspect= mpeg2_aspect[s->aspect_ratio_info];
if(aspect>0.0) s->avctx->aspect_ratio= s->width/(aspect*s->height);
else if(aspect<0.0) s->avctx->aspect_ratio= -1.0/aspect;
if(s->aspect_ratio_info <= 1)
s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info];
else{
s->avctx->sample_aspect_ratio=
av_div_q(
mpeg2_aspect[s->aspect_ratio_info],
(AVRational){s->width, s->height}
);
}
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
printf("profile: %d, level: %d \n", profile, level);
@ -1802,8 +1807,12 @@ static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1)
s1->pan_scan.width= 16*w;
s1->pan_scan.height=16*h;
if(mpeg2_aspect[s->aspect_ratio_info] < 0.0)
s->avctx->aspect_ratio*= (s->width * h)/(float)(s->height * w);
if(s->aspect_ratio_info > 1)
s->avctx->sample_aspect_ratio=
av_div_q(
mpeg2_aspect[s->aspect_ratio_info],
(AVRational){w, h}
);
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
printf("sde w:%d, h:%d\n", w, h);
@ -2243,7 +2252,7 @@ static int mpeg1_decode_sequence(AVCodecContext *avctx,
s->aspect_ratio_info= get_bits(&s->gb, 4);
if(s->codec_id == CODEC_ID_MPEG1VIDEO){
aspect= mpeg1_aspect[s->aspect_ratio_info];
if(aspect!=0.0) avctx->aspect_ratio= width/(aspect*height);
if(aspect!=0.0) avctx->sample_aspect_ratio= av_d2q(aspect, 30000);
}
s->frame_rate_index = get_bits(&s->gb, 4);

23
libavcodec/mpeg12data.h
View File

@ -416,11 +416,22 @@ static const float mpeg1_aspect[16]={
1.2015,
};
static const float mpeg2_aspect[16]={
0,
1.0,
-3.0/4.0,
-9.0/16.0,
-1.0/2.21,
static const AVRational 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},
};

24
libavcodec/mpeg4data.h
View File

@ -341,23 +341,23 @@ static const uint8_t mb_type_b_tab[4][2] = {
{1, 1}, {1, 2}, {1, 3}, {1, 4},
};
static const uint16_t pixel_aspect[16][2]={
{0, 0},
static const AVRational pixel_aspect[16]={
{0, 1},
{1, 1},
{12, 11},
{10, 11},
{16, 11},
{40, 33},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 0},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
{0, 1},
};
/* these matrixes will be permuted for the idct */

2
libavcodec/mpegvideo.h
View File

@ -554,8 +554,6 @@ typedef struct MpegEncContext {
int new_pred;
int reduced_res_vop;
int aspect_ratio_info; //FIXME remove
int aspected_width; //FIXME remove
int aspected_height; //FIXME remove
int sprite_warping_accuracy;
int low_latency_sprite;
int data_partitioning; ///< data partitioning flag from header

61
libavcodec/rational.c Normal file
View File

@ -0,0 +1,61 @@
/*
* Rational numbers
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file rational.c
* Rational numbers
* @author Michael Niedermayer <michaelni@gmx.at>
*/
//#include <math.h>
#include <limits.h>
#include "common.h"
#include "avcodec.h"
#include "rational.h"
AVRational av_mul_q(AVRational b, AVRational c){
av_reduce(&b.num, &b.den, b.num * (int64_t)c.num, b.den * (int64_t)c.den, INT_MAX);
return b;
}
AVRational av_div_q(AVRational b, AVRational c){
av_reduce(&b.num, &b.den, b.num * (int64_t)c.den, b.den * (int64_t)c.num, INT_MAX);
return b;
}
AVRational av_add_q(AVRational b, AVRational c){
av_reduce(&b.num, &b.den, b.num * (int64_t)c.den + c.num * (int64_t)b.den, b.den * (int64_t)c.den, INT_MAX);
return b;
}
AVRational av_sub_q(AVRational b, AVRational c){
av_reduce(&b.num, &b.den, b.num * (int64_t)c.den - c.num * (int64_t)b.den, b.den * (int64_t)c.den, INT_MAX);
return b;
}
AVRational av_d2q(double d, int max){
AVRational a;
int exponent= FFMAX( (int)log2(ABS(d) + 1e-20), 0);
int64_t den= 1LL << (61 - exponent);
av_reduce(&a.num, &a.den, (int64_t)(d * den + 0.5), den, max);
return a;
}

53
libavcodec/rational.h Normal file
View File

@ -0,0 +1,53 @@
/*
* Rational numbers
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/**
* @file rational.h
* Rational numbers.
* @author Michael Niedermayer <michaelni@gmx.at>
*/
#ifndef RATIONAL_H
#define RATIONAL_H
typedef struct AVRational{
int num;
int den;
} AVRational;
static inline int av_cmp_q(AVRational a, AVRational b){
const int64_t tmp= a.num * (int64_t)b.den - b.num * (int64_t)a.den;
if (tmp < 0) return -1;
else if(tmp == 0) return 0;
else return 1;
}
static inline double av_q2d(AVRational a){
return a.num / (double) a.den;
}
AVRational av_mul_q(AVRational b, AVRational c);
AVRational av_div_q(AVRational b, AVRational c);
AVRational av_add_q(AVRational b, AVRational c);
AVRational av_sub_q(AVRational b, AVRational c);
AVRational av_d2q(double d, int max);
#endif // RATIONAL_H

1
libavcodec/utils.c
View File

@ -314,6 +314,7 @@ void avcodec_get_context_defaults(AVCodecContext *s){
s->me_subpel_quality=8;
s->lmin= FF_QP2LAMBDA * s->qmin;
s->lmax= FF_QP2LAMBDA * s->qmax;
s->sample_aspect_ratio= (AVRational){0,1};
s->intra_quant_bias= FF_DEFAULT_QUANT_BIAS;
s->inter_quant_bias= FF_DEFAULT_QUANT_BIAS;

8
libavformat/dv.c
View File

@ -556,10 +556,12 @@ static int dv_extract_video_info(uint8_t* frame, AVCodecContext* avctx)
avctx->height = sys->height;
avctx->pix_fmt = sys->pix_fmt;
vsc_pack = dv_extract_pack(frame, dv_video_control);
/* MN: someone please fill in the correct SAR for dv, i dont have the standard doc so i cant, allthough its very likely the same as MPEG4 (12:11 10:11 16:11 40:33) */
if (vsc_pack && (vsc_pack[2] & 0x07) == (apt?0x02:0x07))
avctx->aspect_ratio = 16.0 / 9.0;
avctx->sample_aspect_ratio = (AVRational){16,9};
else
avctx->aspect_ratio = 4.0 / 3.0;
avctx->sample_aspect_ratio = (AVRational){4,3};
avctx->sample_aspect_ratio = av_div_q(avctx->sample_aspect_ratio, (AVRational){sys->width,sys->height});
size = sys->frame_size;
}
return size;
@ -660,7 +662,7 @@ DVMuxContext* dv_init_mux(AVFormatContext* s)
c->has_audio = c->has_video = 0;
c->start_time = time(NULL);
c->aspect = 0; /* 4:3 is the default */
if ((int)(vst->codec.aspect_ratio * 10) == 17) /* 16:9 */
if ((int)(av_q2d(vst->codec.sample_aspect_ratio) * vst->codec.width / vst->codec.height * 10) == 17) /* 16:9 */
c->aspect = 0x07;
if (fifo_init(&c->audio_data, 100*AVCODEC_MAX_AUDIO_FRAME_SIZE) < 0)

19
libavformat/yuv4mpeg.c
View File

@ -24,18 +24,11 @@
#ifdef CONFIG_ENCODERS
static struct { int n; int d;} SAR[] = {{10, 11}, /* 4:3 NTSC */
{59, 54}, /* 4:3 PAL */
{40, 33}, /* 16:9 NTSC */
{118, 81}, /* 16:9 PAL */
{ 1, 1}};/* should always be the last */
static int yuv4_generate_header(AVFormatContext *s, char* buf)
{
AVStream *st;
int width, height;
int raten, rated, aspectn, aspectd, n, i;
int raten, rated, aspectn, aspectd, n;
char inter;
st = s->streams[0];
@ -44,13 +37,8 @@ static int yuv4_generate_header(AVFormatContext *s, char* buf)
av_reduce(&raten, &rated, st->codec.frame_rate, st->codec.frame_rate_base, (1UL<<31)-1);
for (i=0; i<sizeof(SAR)/sizeof(SAR[0])-1; i++) {
if (ABS(st->codec.aspect_ratio -
(float)SAR[i].n/SAR[i].d * (float)width/height) < 0.05)
break;
}
aspectn = SAR[i].n;
aspectd = SAR[i].d;
aspectn = st->codec.sample_aspect_ratio.num;
aspectd = st->codec.sample_aspect_ratio.den;
inter = 'p'; /* progressive is the default */
if (st->codec.coded_frame && st->codec.coded_frame->interlaced_frame) {
@ -200,6 +188,7 @@ static int yuv4_read_header(AVFormatContext *s, AVFormatParameters *ap)
st->codec.pix_fmt = PIX_FMT_YUV420P;
st->codec.codec_type = CODEC_TYPE_VIDEO;
st->codec.codec_id = CODEC_ID_RAWVIDEO;
st->codec.sample_aspect_ratio= (AVRational){aspectn, aspectd};
return 0;
}