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- /*
- * Librsvg rasterization wrapper
- * Copyright (c) 2017 Rostislav Pehlivanov <atomnuker@gmail.com>
- *
- * This file is part of FFmpeg.
- *
- * 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.
- *
- * 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 FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
- #include "avcodec.h"
- #include "internal.h"
- #include "libavutil/opt.h"
- #include "librsvg-2.0/librsvg/rsvg.h"
- typedef struct LibRSVGContext {
- AVClass *class;
- int width;
- int height;
- int keep_ar;
- char *base_uri;
- int flag;
- } LibRSVGContext;
- static int librsvg_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *pkt)
- {
- int ret;
- LibRSVGContext *s = avctx->priv_data;
- AVFrame *frame = data;
- RsvgHandle *handle;
- RsvgDimensionData unscaled_dimensions, dimensions;
- cairo_surface_t *image;
- cairo_t *crender = NULL;
-
- GError *error = NULL;
- GInputStream *input_stream;
- GFile *referenced_file;
-
- *got_frame = 0;
- input_stream = g_memory_input_stream_new_from_data (pkt->data, pkt->size, NULL);
- referenced_file = g_file_new_for_path(s->base_uri);
- handle = rsvg_handle_new_from_stream_sync (input_stream,
- referenced_file,
- s->flag,
- NULL,
- &error);
- if (error) {
- av_log(avctx, AV_LOG_ERROR, "Error parsing svg!\n");
- g_error_free(error);
- return AVERROR_INVALIDDATA;
- }
- rsvg_handle_get_dimensions(handle, &dimensions);
- rsvg_handle_get_dimensions(handle, &unscaled_dimensions);
- dimensions.width = s->width ? s->width : dimensions.width;
- dimensions.height = s->height ? s->height : dimensions.height;
- if (s->keep_ar && (s->width || s->height)) {
- double default_ar = unscaled_dimensions.width/(double)unscaled_dimensions.height;
- if (!s->width)
- dimensions.width = lrintf(dimensions.height * default_ar);
- else
- dimensions.height = lrintf(dimensions.width / default_ar);
- }
- if ((ret = ff_set_dimensions(avctx, dimensions.width, dimensions.height)))
- return ret;
- avctx->pix_fmt = AV_PIX_FMT_RGB32;
- if ((ret = ff_get_buffer(avctx, frame, 0)))
- return ret;
- frame->pict_type = AV_PICTURE_TYPE_I;
- frame->key_frame = 1;
- image = cairo_image_surface_create_for_data(frame->data[0], CAIRO_FORMAT_ARGB32,
- frame->width, frame->height,
- frame->linesize[0]);
- if (cairo_surface_status(image) != CAIRO_STATUS_SUCCESS)
- return AVERROR_INVALIDDATA;
- crender = cairo_create(image);
- cairo_save(crender);
- cairo_set_operator(crender, CAIRO_OPERATOR_CLEAR);
- cairo_paint(crender);
- cairo_restore(crender);
- cairo_scale(crender, dimensions.width / (double)unscaled_dimensions.width,
- dimensions.height / (double)unscaled_dimensions.height);
- rsvg_handle_render_cairo(handle, crender);
- cairo_destroy(crender);
- cairo_surface_destroy(image);
- g_object_unref(handle);
- g_object_unref(referenced_file);
- g_object_unref(input_stream);
- *got_frame = 1;
- return 0;
- }
- #define OFFSET(x) offsetof(LibRSVGContext, x)
- #define DEC (AV_OPT_FLAG_DECODING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
- static const AVOption options[] = {
- { "width", "Width to render to (0 for default)", OFFSET(width), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
- { "height", "Height to render to (0 for default)", OFFSET(height), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, INT_MAX, DEC },
- { "keep_ar", "Keep aspect ratio with custom width/height", OFFSET(keep_ar), AV_OPT_TYPE_BOOL, { .i64 = 1 }, 0, 1, DEC },
- { "base_uri", "Base URI to load referenced files", OFFSET(base_uri), AV_OPT_TYPE_STRING, { .str = "" }, 0, 0, DEC },
- { "handle_flag", "Value of RsvgHandleFlags", OFFSET(flag), AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 2, DEC},
- { NULL },
- };
- static const AVClass librsvg_decoder_class = {
- .class_name = "Librsvg",
- .item_name = av_default_item_name,
- .option = options,
- .version = LIBAVUTIL_VERSION_INT,
- };
- const AVCodec ff_librsvg_decoder = {
- .name = "librsvg",
- .long_name = NULL_IF_CONFIG_SMALL("Librsvg rasterizer"),
- .priv_class = &librsvg_decoder_class,
- .type = AVMEDIA_TYPE_VIDEO,
- .id = AV_CODEC_ID_SVG,
- .decode = librsvg_decode_frame,
- .priv_data_size = sizeof(LibRSVGContext),
- .capabilities = AV_CODEC_CAP_DR1,
- .wrapper_name = "librsvg",
- };
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