diff options
Diffstat (limited to 'libavcodec/librsvgdec.c')
| -rw-r--r-- | libavcodec/librsvgdec.c | 130 |
1 files changed, 130 insertions, 0 deletions
diff --git a/libavcodec/librsvgdec.c b/libavcodec/librsvgdec.c new file mode 100644 index 0000000..6697785 --- /dev/null +++ b/libavcodec/librsvgdec.c @@ -0,0 +1,130 @@ +/* + * 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; +} 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; + + *got_frame = 0; + + handle = rsvg_handle_new_from_data(pkt->data, pkt->size, &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); + + *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 }, + { NULL }, +}; + +static const AVClass librsvg_decoder_class = { + .class_name = "Librsvg", + .item_name = av_default_item_name, + .option = options, + .version = LIBAVUTIL_VERSION_INT, +}; + +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_LOSSLESS | AV_CODEC_CAP_DR1, + .wrapper_name = "librsvg", +}; |
