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This is possible, because every given FFCodec has to implement exactly one of these. Doing so decreases sizeof(FFCodec) and therefore decreases the size of the binary. Notice that in case of position-independent code the decrease is in .data.rel.ro, so that this translates to decreased memory consumption. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
132 lines
4.4 KiB
C
132 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 "codec_internal.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, AVFrame *frame,
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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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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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const FFCodec ff_librsvg_decoder = {
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.p.name = "librsvg",
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.p.long_name = NULL_IF_CONFIG_SMALL("Librsvg rasterizer"),
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.p.priv_class = &librsvg_decoder_class,
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.p.type = AVMEDIA_TYPE_VIDEO,
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.p.id = AV_CODEC_ID_SVG,
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.p.capabilities = AV_CODEC_CAP_DR1,
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.p.wrapper_name = "librsvg",
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FF_CODEC_DECODE_CB(librsvg_decode_frame),
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.priv_data_size = sizeof(LibRSVGContext),
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};
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