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https://git.videolan.org/git/ffmpeg.git
synced 2024-09-06 16:10:09 +02:00
aspect ratio cleanup
Originally committed as revision 1254 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
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67d06418da
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5d3cea3a86
@ -5,8 +5,8 @@
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#define LIBAVCODEC_VERSION_INT 0x000406
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#define LIBAVCODEC_VERSION "0.4.6"
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#define LIBAVCODEC_BUILD 4639
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#define LIBAVCODEC_BUILD_STR "4639"
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#define LIBAVCODEC_BUILD 4640
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#define LIBAVCODEC_BUILD_STR "4640"
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enum CodecID {
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CODEC_ID_NONE,
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@ -145,6 +145,7 @@ static const int Motion_Est_QTab[] = { ME_ZERO, ME_PHODS, ME_LOG,
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#define CODEC_FLAG_NORMALIZE_AQP 0x00020000 /* normalize adaptive quantization */
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#define CODEC_FLAG_INTERLACED_DCT 0x00040000 /* use interlaced dct */
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#define CODEC_FLAG_LOW_DELAY 0x00080000 /* force low delay / will fail on b frames */
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#define CODEC_FLAG_ALT_SCAN 0x00100000 /* use alternate scan */
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/* codec capabilities */
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@ -222,8 +223,7 @@ typedef struct AVCodecContext {
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int width, height;
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/**
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* encoding: set by user. 0 if not known
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* decoding: set by lavc. 0 if not known
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* Obsolete, will be removed
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*/
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int aspect_ratio_info;
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#define FF_ASPECT_SQUARE 1
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@ -646,9 +646,7 @@ typedef struct AVCodecContext {
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float rc_initial_cplx;
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/**
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* custom aspect ratio, used if aspect_info==FF_ASPECT_EXTENDED
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* encoding: set by user.
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* decoding: set by lavc.
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* Obsolete, will be removed
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*/
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int aspected_width;
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int aspected_height;
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@ -795,6 +793,13 @@ typedef struct AVCodecContext {
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#define FF_PRED_LEFT 0
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#define FF_PRED_PLANE 1
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#define FF_PRED_MEDIAN 2
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/**
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* aspect ratio. (0 if unknown)
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* encoding: set by user.
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* decoding: set by lavc.
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*/
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float aspect_ratio;
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} AVCodecContext;
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typedef struct AVCodec {
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@ -326,3 +326,29 @@ int ff_gcd(int a, int b){
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if(b) return ff_gcd(b, a%b);
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else return a;
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}
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void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max){
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double best_diff=1E10, diff;
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int best_denom=1, best_nom=1;
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int nom, denom, gcd;
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//brute force here, perhaps we should try continued fractions if we need large max ...
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for(denom=1; denom<=max; denom++){
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nom= (int)(f*denom + 0.5);
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if(nom<=0 || nom>max) continue;
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diff= ABS( f - (double)nom / (double)denom );
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if(diff < best_diff){
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best_diff= diff;
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best_nom= nom;
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best_denom= denom;
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}
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}
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gcd= ff_gcd(best_nom, best_denom);
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best_nom /= gcd;
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best_denom /= gcd;
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*nom_arg= best_nom;
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*denom_arg= best_denom;
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}
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@ -842,6 +842,8 @@ static inline int ff_get_fourcc(const char *s){
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return (s[0]) + (s[1]<<8) + (s[2]<<16) + (s[3]<<24);
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}
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void ff_float2fraction(int *nom_arg, int *denom_arg, double f, int max);
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#ifdef ARCH_X86
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#define MASK_ABS(mask, level)\
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@ -120,6 +120,26 @@ int h263_get_picture_format(int width, int height)
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return format;
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}
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static void init_aspect_info(MpegEncContext * s){
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double aspect;
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emms_c(); //paranoia ;)
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if(s->avctx->aspect_ratio==0) aspect= 1.0;
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aspect= s->avctx->aspect_ratio;
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ff_float2fraction(&s->aspected_width, &s->aspected_height, aspect, 255);
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if(s->aspected_width == 4 && s->aspected_height == 3)
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s->aspect_ratio_info= FF_ASPECT_4_3_625;
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else if(s->aspected_width == 16 && s->aspected_height == 9)
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s->aspect_ratio_info= FF_ASPECT_16_9_625;
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else if(s->aspected_width == 1 && s->aspected_height == 1)
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s->aspect_ratio_info= FF_ASPECT_SQUARE;
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else
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s->aspect_ratio_info= FF_ASPECT_EXTENDED;
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}
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void h263_encode_picture_header(MpegEncContext * s, int picture_number)
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{
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int format;
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@ -196,11 +216,9 @@ void h263_encode_picture_header(MpegEncContext * s, int picture_number)
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if (format == 7) {
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/* Custom Picture Format (CPFMT) */
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init_aspect_info(s);
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if (s->aspect_ratio_info)
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put_bits(&s->pb,4,s->aspect_ratio_info);
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else
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put_bits(&s->pb,4,2); /* Aspect ratio: CIF 12:11 (4:3) picture */
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put_bits(&s->pb,4,s->aspect_ratio_info);
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put_bits(&s->pb,9,(s->width >> 2) - 1);
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put_bits(&s->pb,1,1); /* "1" to prevent start code emulation */
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put_bits(&s->pb,9,(s->height >> 2));
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@ -1508,10 +1526,10 @@ static void mpeg4_encode_vol_header(MpegEncContext * s)
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put_bits(&s->pb, 1, 1); /* is obj layer id= yes */
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put_bits(&s->pb, 4, vo_ver_id); /* is obj layer ver id */
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put_bits(&s->pb, 3, 1); /* is obj layer priority */
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if(s->aspect_ratio_info)
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put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
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else
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put_bits(&s->pb, 4, 1); /* aspect ratio info= sqare pixel */
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init_aspect_info(s);
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put_bits(&s->pb, 4, s->aspect_ratio_info);/* aspect ratio info */
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if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
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{
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put_bits(&s->pb, 8, s->aspected_width);
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@ -348,6 +348,8 @@ static int h263_decode_frame(AVCodecContext *avctx,
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MpegEncContext *s = avctx->priv_data;
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int ret,i;
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AVPicture *pict = data;
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float new_aspect;
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#ifdef PRINT_FRAME_TIME
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uint64_t time= rdtsc();
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#endif
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@ -495,23 +497,19 @@ retry:
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/* and other parameters. So then we could init the picture */
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/* FIXME: By the way H263 decoder is evolving it should have */
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/* an H263EncContext */
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if(s->aspected_height)
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new_aspect= (float)s->aspected_width / (float)s->aspected_height;
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else
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new_aspect=0;
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if ( s->width != avctx->width || s->height != avctx->height
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|| avctx->aspect_ratio_info != s->aspect_ratio_info
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|| avctx->aspected_width != s->aspected_width
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|| avctx->aspected_height != s->aspected_height) {
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|| ABS(new_aspect - avctx->aspect_ratio) > 0.001) {
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/* H.263 could change picture size any time */
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MPV_common_end(s);
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s->context_initialized=0;
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}
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if (!s->context_initialized) {
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avctx->width = s->width;
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avctx->height = s->height;
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avctx->aspect_ratio_info= s->aspect_ratio_info;
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if (s->aspect_ratio_info == FF_ASPECT_EXTENDED)
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{
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avctx->aspected_width = s->aspected_width;
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avctx->aspected_height = s->aspected_height;
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}
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avctx->aspect_ratio= new_aspect;
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goto retry;
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}
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@ -557,12 +557,6 @@ int MPV_encode_init(AVCodecContext *avctx)
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s->qcompress= avctx->qcompress;
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s->qblur= avctx->qblur;
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s->avctx = avctx;
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s->aspect_ratio_info= avctx->aspect_ratio_info;
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if (avctx->aspect_ratio_info == FF_ASPECT_EXTENDED)
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{
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s->aspected_width = avctx->aspected_width;
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s->aspected_height = avctx->aspected_height;
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}
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s->flags= avctx->flags;
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s->max_b_frames= avctx->max_b_frames;
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s->b_frame_strategy= avctx->b_frame_strategy;
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