videolan/ffmpeg
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aspect ratio cleanup

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Originally committed as revision 1254 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2002-11-20 13:08:04 +00:00
parent 67d06418da
commit 5d3cea3a86
6 changed files with 76 additions and 33 deletions
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19
libavcodec/avcodec.h
View File

@ -5,8 +5,8 @@
#define LIBAVCODEC_VERSION_INT 0x000406
#define LIBAVCODEC_VERSION "0.4.6"
#define LIBAVCODEC_BUILD 4639
#define LIBAVCODEC_BUILD_STR "4639"
#define LIBAVCODEC_BUILD 4640
#define LIBAVCODEC_BUILD_STR "4640"
enum CodecID {
CODEC_ID_NONE,
@ -145,6 +145,7 @@ static const int Motion_Est_QTab[] = { ME_ZERO, ME_PHODS, ME_LOG,
#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 /* normalize adaptive quantization */
#define CODEC_FLAG_INTERLACED_DCT 0x00040000 /* use interlaced dct */
#define CODEC_FLAG_LOW_DELAY 0x00080000 /* force low delay / will fail on b frames */
#define CODEC_FLAG_ALT_SCAN 0x00100000 /* use alternate scan */
/* codec capabilities */
@ -222,8 +223,7 @@ typedef struct AVCodecContext {
int width, height;
/**
* encoding: set by user. 0 if not known
* decoding: set by lavc. 0 if not known
* Obsolete, will be removed
*/
int aspect_ratio_info;
#define FF_ASPECT_SQUARE 1
@ -646,9 +646,7 @@ typedef struct AVCodecContext {
float rc_initial_cplx;
/**
* custom aspect ratio, used if aspect_info==FF_ASPECT_EXTENDED
* encoding: set by user.
* decoding: set by lavc.
* Obsolete, will be removed
*/
int aspected_width;
int aspected_height;
@ -795,6 +793,13 @@ typedef struct AVCodecContext {
#define FF_PRED_LEFT 0
#define FF_PRED_PLANE 1
#define FF_PRED_MEDIAN 2
/**
* aspect ratio. (0 if unknown)
* encoding: set by user.
* decoding: set by lavc.
*/
float aspect_ratio;
} AVCodecContext;
typedef struct AVCodec {

26
libavcodec/common.c
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@ -326,3 +326,29 @@ int ff_gcd(int a, int 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;
}

2
libavcodec/common.h
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@ -842,6 +842,8 @@ static inline int ff_get_fourcc(const char *s){
return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
}
void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
#ifdef ARCH_X86
#define MASK_ABS(mask, level)\

36
libavcodec/h263.c
View File

@ -120,6 +120,26 @@ int h263_get_picture_format(int width, int height)
return format;
}
static void init_aspect_info(MpegEncContext * s){
double aspect;
emms_c(); //paranoia ;)
if(s->avctx->aspect_ratio==0) aspect= 1.0;
aspect= s->avctx->aspect_ratio;
ff_float2fraction(&s->aspected_width, &s->aspected_height, aspect, 255);
if(s->aspected_width == 4 && s->aspected_height == 3)
s->aspect_ratio_info= FF_ASPECT_4_3_625;
else if(s->aspected_width == 16 && s->aspected_height == 9)
s->aspect_ratio_info= FF_ASPECT_16_9_625;
else if(s->aspected_width == 1 && s->aspected_height == 1)
s->aspect_ratio_info= FF_ASPECT_SQUARE;
else
s->aspect_ratio_info= FF_ASPECT_EXTENDED;
}
void h263_encode_picture_header(MpegEncContext * s, int picture_number)
{
int format;
@ -196,11 +216,9 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
if (format == 7) {
/* Custom Picture Format (CPFMT) */
if (s->aspect_ratio_info)
put_bits(&s->pb,4,s->aspect_ratio_info);
else
put_bits(&s->pb,4,2); /* Aspect ratio: CIF 12:11 (4:3) picture */
init_aspect_info(s);
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));
@ -1508,10 +1526,10 @@ static void mpeg4_encode_vol_header(MpegEncContext * s)
put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
put_bits(&s->pb, 3, 1); /* is obj layer priority */
if(s->aspect_ratio_info)
put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
else
put_bits(&s->pb, 4, 1); /* aspect ratio info= sqare pixel */
init_aspect_info(s);
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);

20
libavcodec/h263dec.c
View File

@ -348,6 +348,8 @@ static int h263_decode_frame(AVCodecContext *avctx,
MpegEncContext *s = avctx->priv_data;
int ret,i;
AVPicture *pict = data;
float new_aspect;
#ifdef PRINT_FRAME_TIME
uint64_t time= rdtsc();
#endif
@ -495,23 +497,19 @@ 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= (float)s->aspected_width / (float)s->aspected_height;
else
new_aspect=0;
if ( s->width != avctx->width || s->height != avctx->height
|| avctx->aspect_ratio_info != s->aspect_ratio_info
|| avctx->aspected_width != s->aspected_width
|| avctx->aspected_height != s->aspected_height) {
|| ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
/* H.263 could change picture size any time */
MPV_common_end(s);
s->context_initialized=0;
}
if (!s->context_initialized) {
avctx->width = s->width;
avctx->height = s->height;
avctx->aspect_ratio_info= s->aspect_ratio_info;
if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
{
avctx->aspected_width = s->aspected_width;
avctx->aspected_height = s->aspected_height;
}
avctx->aspect_ratio= new_aspect;
goto retry;
}

6
libavcodec/mpegvideo.c
View File

@ -557,12 +557,6 @@ int MPV_encode_init(AVCodecContext *avctx)
s->qcompress= avctx->qcompress;
s->qblur= avctx->qblur;
s->avctx = avctx;
s->aspect_ratio_info= avctx->aspect_ratio_info;
if (avctx->aspect_ratio_info == FF_ASPECT_EXTENDED)
{
s->aspected_width = avctx->aspected_width;
s->aspected_height = avctx->aspected_height;
}
s->flags= avctx->flags;
s->max_b_frames= avctx->max_b_frames;
s->b_frame_strategy= avctx->b_frame_strategy;