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108958e43d
The existing code attempts to clear the frame by painting in OVER mode with transparent black - which is a no-op. As a result if you have many input frames (e.g. you're using a sequence of svg files), you'll start to see new frames drawn over old frames as memory gets re-used. Switch the code to paint using the CLEAR compositing operator, which fills every channel with 0 values (setting a source colour is not required).
131 lines
4.4 KiB
C
131 lines
4.4 KiB
C
/*
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* Librsvg rasterization wrapper
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* Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "internal.h"
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#include "libavutil/opt.h"
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#include "librsvg-2.0/librsvg/rsvg.h"
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typedef struct LibRSVGContext {
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AVClass *class;
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int width;
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int height;
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int keep_ar;
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} LibRSVGContext;
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static int librsvg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt)
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{
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int ret;
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LibRSVGContext *s = avctx->priv_data;
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AVFrame *frame = data;
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RsvgHandle *handle;
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RsvgDimensionData unscaled_dimensions, dimensions;
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cairo_surface_t *image;
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cairo_t *crender = NULL;
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GError *error = NULL;
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*got_frame = 0;
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handle = rsvg_handle_new_from_data(pkt->data, pkt->size, &error);
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if (error) {
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av_log(avctx, AV_LOG_ERROR, "Error parsing svg!\n");
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g_error_free(error);
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return AVERROR_INVALIDDATA;
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}
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rsvg_handle_get_dimensions(handle, &dimensions);
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rsvg_handle_get_dimensions(handle, &unscaled_dimensions);
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dimensions.width = s->width ? s->width : dimensions.width;
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dimensions.height = s->height ? s->height : dimensions.height;
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if (s->keep_ar && (s->width || s->height)) {
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double default_ar = unscaled_dimensions.width/(double)unscaled_dimensions.height;
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if (!s->width)
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dimensions.width = lrintf(dimensions.height * default_ar);
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else
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dimensions.height = lrintf(dimensions.width / default_ar);
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}
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if ((ret = ff_set_dimensions(avctx, dimensions.width, dimensions.height)))
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return ret;
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avctx->pix_fmt = AV_PIX_FMT_RGB32;
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if ((ret = ff_get_buffer(avctx, frame, 0)))
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return ret;
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frame->pict_type = AV_PICTURE_TYPE_I;
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frame->key_frame = 1;
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image = cairo_image_surface_create_for_data(frame->data[0], CAIRO_FORMAT_ARGB32,
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frame->width, frame->height,
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frame->linesize[0]);
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if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS)
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return AVERROR_INVALIDDATA;
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crender = cairo_create(image);
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cairo_save(crender);
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cairo_set_operator(crender, CAIRO_OPERATOR_CLEAR);
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cairo_paint(crender);
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cairo_restore(crender);
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cairo_scale(crender, dimensions.width / (double)unscaled_dimensions.width,
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dimensions.height / (double)unscaled_dimensions.height);
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rsvg_handle_render_cairo(handle, crender);
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cairo_destroy(crender);
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cairo_surface_destroy(image);
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g_object_unref(handle);
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*got_frame = 1;
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return 0;
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}
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#define OFFSET(x) offsetof(LibRSVGContext, x)
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#define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
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static const AVOption options[] = {
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{ "width", "Width to render to (0 for default)", OFFSET(width), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
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{ "height", "Height to render to (0 for default)", OFFSET(height), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
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{ "keep_ar", "Keep aspect ratio with custom width/height", OFFSET(keep_ar), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, DEC },
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{ NULL },
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};
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static const AVClass librsvg_decoder_class = {
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.class_name = "Librsvg",
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.item_name = av_default_item_name,
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.option = options,
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.version = LIBAVUTIL_VERSION_INT,
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};
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AVCodec ff_librsvg_decoder = {
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.name = "librsvg",
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.long_name = NULL_IF_CONFIG_SMALL("Librsvg rasterizer"),
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.priv_class = &librsvg_decoder_class,
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SVG,
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.decode = librsvg_decode_frame,
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.priv_data_size = sizeof(LibRSVGContext),
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.capabilities = AV_CODEC_CAP_LOSSLESS | AV_CODEC_CAP_DR1,
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.wrapper_name = "librsvg",
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};
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