summaryrefslogtreecommitdiff
path: root/libavfilter/vf_scale.c
diff options
context:
space:
mode:
Diffstat (limited to 'libavfilter/vf_scale.c')
-rw-r--r--libavfilter/vf_scale.c239
1 files changed, 176 insertions, 63 deletions
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index cbc1081cd9..82a777c5f8 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -1,20 +1,20 @@
/*
* Copyright (c) 2007 Bobby Bingham
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg 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 Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -35,41 +35,42 @@
#include "libavutil/internal.h"
#include "libavutil/mathematics.h"
#include "libavutil/opt.h"
+#include "libavutil/parseutils.h"
#include "libavutil/pixdesc.h"
+#include "libavutil/imgutils.h"
+#include "libavutil/avassert.h"
#include "libswscale/swscale.h"
static const char *const var_names[] = {
- "PI",
- "PHI",
- "E",
"in_w", "iw",
"in_h", "ih",
"out_w", "ow",
"out_h", "oh",
- "a", "dar",
+ "a",
"sar",
+ "dar",
"hsub",
"vsub",
NULL
};
enum var_name {
- VAR_PI,
- VAR_PHI,
- VAR_E,
VAR_IN_W, VAR_IW,
VAR_IN_H, VAR_IH,
VAR_OUT_W, VAR_OW,
VAR_OUT_H, VAR_OH,
- VAR_A, VAR_DAR,
+ VAR_A,
VAR_SAR,
+ VAR_DAR,
VAR_HSUB,
VAR_VSUB,
VARS_NB
};
typedef struct {
+ const AVClass *class;
struct SwsContext *sws; ///< software scaler context
+ struct SwsContext *isws[2]; ///< software scaler context for interlaced material
/**
* New dimensions. Special values are:
@@ -77,37 +78,92 @@ typedef struct {
* -1 = keep original aspect
*/
int w, h;
+ char *flags_str; ///sws flags string
+ char *size_str;
unsigned int flags; ///sws flags
int hsub, vsub; ///< chroma subsampling
int slice_y; ///< top of current output slice
int input_is_pal; ///< set to 1 if the input format is paletted
+ int output_is_pal; ///< set to 1 if the output format is paletted
+ int interlaced;
- char w_expr[256]; ///< width expression string
- char h_expr[256]; ///< height expression string
+ char *w_expr; ///< width expression string
+ char *h_expr; ///< height expression string
} ScaleContext;
+#define OFFSET(x) offsetof(ScaleContext, x)
+#define FLAGS AV_OPT_FLAG_VIDEO_PARAM|AV_OPT_FLAG_FILTERING_PARAM
+
+static const AVOption scale_options[] = {
+ { "w", "set width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "width", "set width expression", OFFSET(w_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "h", "set height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "height", "set height expression", OFFSET(h_expr), AV_OPT_TYPE_STRING, {.str = NULL}, 0, 0, FLAGS },
+ { "flags", "set libswscale flags", OFFSET(flags_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, INT_MAX, FLAGS },
+ { "interl", "set interlacing", OFFSET(interlaced), AV_OPT_TYPE_INT, {.i64 = 0 }, -1, 1, FLAGS },
+ { "size", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
+ { "s", "set video size", OFFSET(size_str), AV_OPT_TYPE_STRING, {.str = NULL}, 0, FLAGS },
+ { NULL },
+};
+
+AVFILTER_DEFINE_CLASS(scale);
+
static av_cold int init(AVFilterContext *ctx, const char *args)
{
ScaleContext *scale = ctx->priv;
- const char *p;
+ static const char *shorthand[] = { "w", "h", NULL };
+ int ret;
+ const char *args0 = args;
- av_strlcpy(scale->w_expr, "iw", sizeof(scale->w_expr));
- av_strlcpy(scale->h_expr, "ih", sizeof(scale->h_expr));
+ scale->class = &scale_class;
+ av_opt_set_defaults(scale);
- scale->flags = SWS_BILINEAR;
- if (args) {
- sscanf(args, "%255[^:]:%255[^:]", scale->w_expr, scale->h_expr);
- p = strstr(args,"flags=");
- if (p) {
- const AVClass *class = sws_get_class();
- const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
- AV_OPT_SEARCH_FAKE_OBJ);
- int ret = av_opt_eval_flags(&class, o, p + 6, &scale->flags);
-
- if (ret < 0)
- return ret;
+ if (args && (scale->size_str = av_get_token(&args, ":"))) {
+ if (av_parse_video_size(&scale->w, &scale->h, scale->size_str) < 0) {
+ av_freep(&scale->size_str);
+ args = args0;
+ } else if (*args)
+ args++;
+ }
+
+ if ((ret = av_opt_set_from_string(scale, args, shorthand, "=", ":")) < 0)
+ return ret;
+
+ if (scale->size_str && (scale->w_expr || scale->h_expr)) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Size and width/height expressions cannot be set at the same time.\n");
+ return AVERROR(EINVAL);
+ }
+
+ if (scale->size_str) {
+ char buf[32];
+ if ((ret = av_parse_video_size(&scale->w, &scale->h, scale->size_str)) < 0) {
+ av_log(ctx, AV_LOG_ERROR,
+ "Invalid size '%s'\n", scale->size_str);
+ return ret;
}
+ snprintf(buf, sizeof(buf)-1, "%d", scale->w);
+ av_opt_set(scale, "w", buf, 0);
+ snprintf(buf, sizeof(buf)-1, "%d", scale->h);
+ av_opt_set(scale, "h", buf, 0);
+ }
+ if (!scale->w_expr)
+ av_opt_set(scale, "w", "iw", 0);
+ if (!scale->h_expr)
+ av_opt_set(scale, "h", "ih", 0);
+
+ av_log(ctx, AV_LOG_VERBOSE, "w:%s h:%s flags:%s interl:%d\n",
+ scale->w_expr, scale->h_expr, scale->flags_str, scale->interlaced);
+
+ scale->flags = SWS_BILINEAR;
+ if (scale->flags_str) {
+ const AVClass *class = sws_get_class();
+ const AVOption *o = av_opt_find(&class, "sws_flags", NULL, 0,
+ AV_OPT_SEARCH_FAKE_OBJ);
+ int ret = av_opt_eval_flags(&class, o, scale->flags_str, &scale->flags);
+ if (ret < 0)
+ return ret;
}
return 0;
@@ -117,7 +173,10 @@ static av_cold void uninit(AVFilterContext *ctx)
{
ScaleContext *scale = ctx->priv;
sws_freeContext(scale->sws);
+ sws_freeContext(scale->isws[0]);
+ sws_freeContext(scale->isws[1]);
scale->sws = NULL;
+ av_opt_free(scale);
}
static int query_formats(AVFilterContext *ctx)
@@ -139,7 +198,7 @@ static int query_formats(AVFilterContext *ctx)
if (ctx->outputs[0]) {
formats = NULL;
for (pix_fmt = 0; pix_fmt < AV_PIX_FMT_NB; pix_fmt++)
- if ( sws_isSupportedOutput(pix_fmt)
+ if ( (sws_isSupportedOutput(pix_fmt) || pix_fmt == AV_PIX_FMT_PAL8)
&& (ret = ff_add_format(&formats, pix_fmt)) < 0) {
ff_formats_unref(&formats);
return ret;
@@ -154,6 +213,7 @@ static int config_props(AVFilterLink *outlink)
{
AVFilterContext *ctx = outlink->src;
AVFilterLink *inlink = outlink->src->inputs[0];
+ enum AVPixelFormat outfmt = outlink->format;
ScaleContext *scale = ctx->priv;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(inlink->format);
int64_t w, h;
@@ -161,16 +221,14 @@ static int config_props(AVFilterLink *outlink)
char *expr;
int ret;
- var_values[VAR_PI] = M_PI;
- var_values[VAR_PHI] = M_PHI;
- var_values[VAR_E] = M_E;
var_values[VAR_IN_W] = var_values[VAR_IW] = inlink->w;
var_values[VAR_IN_H] = var_values[VAR_IH] = inlink->h;
var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
- var_values[VAR_DAR] = var_values[VAR_A] = (double) inlink->w / inlink->h;
+ var_values[VAR_A] = (double) inlink->w / inlink->h;
var_values[VAR_SAR] = inlink->sample_aspect_ratio.num ?
(double) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
+ var_values[VAR_DAR] = var_values[VAR_A] * var_values[VAR_SAR];
var_values[VAR_HSUB] = 1 << desc->log2_chroma_w;
var_values[VAR_VSUB] = 1 << desc->log2_chroma_h;
@@ -220,13 +278,12 @@ static int config_props(AVFilterLink *outlink)
outlink->h = h;
/* TODO: make algorithm configurable */
- av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s -> w:%d h:%d fmt:%s flags:0x%0x\n",
- inlink ->w, inlink ->h, av_get_pix_fmt_name(inlink->format),
- outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
- scale->flags);
scale->input_is_pal = desc->flags & PIX_FMT_PAL ||
desc->flags & PIX_FMT_PSEUDOPAL;
+ if (outfmt == AV_PIX_FMT_PAL8) outfmt = AV_PIX_FMT_BGR8;
+ scale->output_is_pal = av_pix_fmt_desc_get(outfmt)->flags & PIX_FMT_PAL ||
+ av_pix_fmt_desc_get(outfmt)->flags & PIX_FMT_PSEUDOPAL;
if (scale->sws)
sws_freeContext(scale->sws);
@@ -235,25 +292,40 @@ static int config_props(AVFilterLink *outlink)
scale->sws = NULL;
else {
scale->sws = sws_getContext(inlink ->w, inlink ->h, inlink ->format,
- outlink->w, outlink->h, outlink->format,
+ outlink->w, outlink->h, outfmt,
scale->flags, NULL, NULL, NULL);
- if (!scale->sws)
+ if (scale->isws[0])
+ sws_freeContext(scale->isws[0]);
+ scale->isws[0] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
+ outlink->w, outlink->h/2, outfmt,
+ scale->flags, NULL, NULL, NULL);
+ if (scale->isws[1])
+ sws_freeContext(scale->isws[1]);
+ scale->isws[1] = sws_getContext(inlink ->w, inlink ->h/2, inlink ->format,
+ outlink->w, outlink->h/2, outfmt,
+ scale->flags, NULL, NULL, NULL);
+ if (!scale->sws || !scale->isws[0] || !scale->isws[1])
return AVERROR(EINVAL);
}
-
- if (inlink->sample_aspect_ratio.num)
- outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h*inlink->w,
- outlink->w*inlink->h},
- inlink->sample_aspect_ratio);
- else
+ if (inlink->sample_aspect_ratio.num){
+ outlink->sample_aspect_ratio = av_mul_q((AVRational){outlink->h * inlink->w, outlink->w * inlink->h}, inlink->sample_aspect_ratio);
+ } else
outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;
+ av_log(ctx, AV_LOG_VERBOSE, "w:%d h:%d fmt:%s sar:%d/%d -> w:%d h:%d fmt:%s sar:%d/%d flags:0x%0x\n",
+ inlink ->w, inlink ->h, av_get_pix_fmt_name( inlink->format),
+ inlink->sample_aspect_ratio.num, inlink->sample_aspect_ratio.den,
+ outlink->w, outlink->h, av_get_pix_fmt_name(outlink->format),
+ outlink->sample_aspect_ratio.num, outlink->sample_aspect_ratio.den,
+ scale->flags);
return 0;
fail:
av_log(NULL, AV_LOG_ERROR,
- "Error when evaluating the expression '%s'\n", expr);
+ "Error when evaluating the expression '%s'.\n"
+ "Maybe the expression for out_w:'%s' or for out_h:'%s' is self-referencing.\n",
+ expr, scale->w_expr, scale->h_expr);
return ret;
}
@@ -263,8 +335,26 @@ static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
AVFilterLink *outlink = link->dst->outputs[0];
AVFilterBufferRef *outpicref, *for_next_filter;
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(link->format);
+ char buf[32];
int ret = 0;
+ if( picref->video->w != link->w
+ || picref->video->h != link->h
+ || picref->format != link->format) {
+ int ret;
+ snprintf(buf, sizeof(buf)-1, "%d", outlink->w);
+ av_opt_set(scale, "w", buf, 0);
+ snprintf(buf, sizeof(buf)-1, "%d", outlink->h);
+ av_opt_set(scale, "h", buf, 0);
+
+ link->dst->inputs[0]->format = picref->format;
+ link->dst->inputs[0]->w = picref->video->w;
+ link->dst->inputs[0]->h = picref->video->h;
+
+ if ((ret = config_props(outlink)) < 0)
+ return ret;
+ }
+
if (!scale->sws) {
outpicref = avfilter_ref_buffer(picref, ~0);
if (!outpicref)
@@ -275,7 +365,7 @@ static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
scale->hsub = desc->log2_chroma_w;
scale->vsub = desc->log2_chroma_h;
- outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE, outlink->w, outlink->h);
+ outpicref = ff_get_video_buffer(outlink, AV_PERM_WRITE|AV_PERM_ALIGN, outlink->w, outlink->h);
if (!outpicref)
return AVERROR(ENOMEM);
@@ -283,10 +373,12 @@ static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
outpicref->video->w = outlink->w;
outpicref->video->h = outlink->h;
+ if(scale->output_is_pal)
+ avpriv_set_systematic_pal2((uint32_t*)outpicref->data[1], outlink->format == AV_PIX_FMT_PAL8 ? AV_PIX_FMT_BGR8 : outlink->format);
- av_reduce(&outpicref->video->pixel_aspect.num, &outpicref->video->pixel_aspect.den,
- (int64_t)picref->video->pixel_aspect.num * outlink->h * link->w,
- (int64_t)picref->video->pixel_aspect.den * outlink->w * link->h,
+ av_reduce(&outpicref->video->sample_aspect_ratio.num, &outpicref->video->sample_aspect_ratio.den,
+ (int64_t)picref->video->sample_aspect_ratio.num * outlink->h * link->w,
+ (int64_t)picref->video->sample_aspect_ratio.den * outlink->w * link->h,
INT_MAX);
scale->slice_y = 0;
@@ -305,12 +397,36 @@ static int start_frame(AVFilterLink *link, AVFilterBufferRef *picref)
return 0;
}
+static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h, int mul, int field)
+{
+ ScaleContext *scale = link->dst->priv;
+ AVFilterBufferRef *cur_pic = link->cur_buf;
+ AVFilterBufferRef *out_buf = link->dst->outputs[0]->out_buf;
+ const uint8_t *in[4];
+ uint8_t *out[4];
+ int in_stride[4],out_stride[4];
+ int i;
+
+ for(i=0; i<4; i++){
+ int vsub= ((i+1)&2) ? scale->vsub : 0;
+ in_stride[i] = cur_pic->linesize[i] * mul;
+ out_stride[i] = out_buf->linesize[i] * mul;
+ in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];
+ out[i] = out_buf->data[i] + field * out_buf->linesize[i];
+ }
+ if(scale->input_is_pal)
+ in[1] = cur_pic->data[1];
+ if(scale->output_is_pal)
+ out[1] = out_buf->data[1];
+
+ return sws_scale(sws, in, in_stride, y/mul, h,
+ out,out_stride);
+}
+
static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
{
ScaleContext *scale = link->dst->priv;
int out_h, ret;
- AVFilterBufferRef *cur_pic = link->cur_buf;
- const uint8_t *data[4];
if (!scale->sws) {
return ff_draw_slice(link->dst->outputs[0], y, h, slice_dir);
@@ -319,16 +435,13 @@ static int draw_slice(AVFilterLink *link, int y, int h, int slice_dir)
if (scale->slice_y == 0 && slice_dir == -1)
scale->slice_y = link->dst->outputs[0]->h;
- data[0] = cur_pic->data[0] + y * cur_pic->linesize[0];
- data[1] = scale->input_is_pal ?
- cur_pic->data[1] :
- cur_pic->data[1] + (y>>scale->vsub) * cur_pic->linesize[1];
- data[2] = cur_pic->data[2] + (y>>scale->vsub) * cur_pic->linesize[2];
- data[3] = cur_pic->data[3] + y * cur_pic->linesize[3];
-
- out_h = sws_scale(scale->sws, data, cur_pic->linesize, y, h,
- link->dst->outputs[0]->out_buf->data,
- link->dst->outputs[0]->out_buf->linesize);
+ if(scale->interlaced>0 || (scale->interlaced<0 && link->cur_buf->video->interlaced)){
+ av_assert0(y%(2<<scale->vsub) == 0);
+ out_h = scale_slice(link, scale->isws[0], y, (h+1)/2, 2, 0);
+ out_h+= scale_slice(link, scale->isws[1], y, h /2, 2, 1);
+ }else{
+ out_h = scale_slice(link, scale->sws, y, h, 1, 0);
+ }
if (slice_dir == -1)
scale->slice_y -= out_h;
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-15 18:41:18 +0000