From 5fd4cffe3214fcd11f25110673923487e54cd8b0 Mon Sep 17 00:00:00 2001 From: Rostislav Pehlivanov Date: Mon, 8 May 2017 05:02:19 +0100 Subject: [PATCH] lavc: add a librsvg rasterization library wrapper Enables rendering of SVG images. This is possible since SVG images still contain and specify the dimensions in pixels to which they've been drawn to and thus enable browsers to display them without any external data. Users can still override and generate images with arbitrary resolutions. Signed-off-by: Rostislav Pehlivanov --- Changelog | 1 + configure | 4 ++ libavcodec/Makefile | 1 + libavcodec/allcodecs.c | 1 + libavcodec/librsvgdec.c | 127 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 134 insertions(+) create mode 100644 libavcodec/librsvgdec.c diff --git a/Changelog b/Changelog index 581aa73fc7..3504b7ff35 100644 --- a/Changelog +++ b/Changelog @@ -11,6 +11,7 @@ version : - update cuvid/nvenc headers to Video Codec SDK 8.0.14 - afir audio filter - scale_cuda CUDA based video scale filter +- librsvg support for svg rasterization version 3.3: - CrystalHD decoder moved to new decode API diff --git a/configure b/configure index 73814ede38..e4862f6a35 100755 --- a/configure +++ b/configure @@ -245,6 +245,7 @@ External library support: --enable-libopenmpt enable decoding tracked files via libopenmpt [no] --enable-libopus enable Opus de/encoding via libopus [no] --enable-libpulse enable Pulseaudio input via libpulse [no] + --enable-librsvg enable SVG rasterization via librsvg [no] --enable-librubberband enable rubberband needed for rubberband filter [no] --enable-librtmp enable RTMP[E] support via librtmp [no] --enable-libschroedinger enable Dirac de/encoding via libschroedinger [no] @@ -1560,6 +1561,7 @@ EXTERNAL_LIBRARY_LIST=" libopenmpt libopus libpulse + librsvg librtmp libschroedinger libshine @@ -2875,6 +2877,7 @@ libopenmpt_demuxer_deps="libopenmpt" libopus_decoder_deps="libopus" libopus_encoder_deps="libopus" libopus_encoder_select="audio_frame_queue" +librsvg_decoder_deps="librsvg" libschroedinger_decoder_deps="libschroedinger" libschroedinger_encoder_deps="libschroedinger" libshine_encoder_deps="libshine" @@ -5837,6 +5840,7 @@ enabled libopus && { } } enabled libpulse && require_pkg_config libpulse pulse/pulseaudio.h pa_context_new +enabled librsvg && require_pkg_config librsvg-2.0 librsvg-2.0/librsvg/rsvg.h rsvg_handle_render_cairo enabled librtmp && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket enabled librubberband && require_pkg_config "rubberband >= 1.8.1" rubberband/rubberband-c.h rubberband_new enabled libschroedinger && require_pkg_config schroedinger-1.0 schroedinger/schro.h schro_init diff --git a/libavcodec/Makefile b/libavcodec/Makefile index 0ec39fe2f2..3d93c05ff8 100644 --- a/libavcodec/Makefile +++ b/libavcodec/Makefile @@ -551,6 +551,7 @@ OBJS-$(CONFIG_SUBVIEWER1_DECODER) += textdec.o ass.o OBJS-$(CONFIG_SUBVIEWER_DECODER) += subviewerdec.o ass.o OBJS-$(CONFIG_SUNRAST_DECODER) += sunrast.o OBJS-$(CONFIG_SUNRAST_ENCODER) += sunrastenc.o +OBJS-$(CONFIG_LIBRSVG_DECODER) += librsvgdec.o OBJS-$(CONFIG_SVQ1_DECODER) += svq1dec.o svq1.o svq13.o h263data.o OBJS-$(CONFIG_SVQ1_ENCODER) += svq1enc.o svq1.o h263data.o \ h263.o ituh263enc.o diff --git a/libavcodec/allcodecs.c b/libavcodec/allcodecs.c index 7fcc26f2c1..425a32c924 100644 --- a/libavcodec/allcodecs.c +++ b/libavcodec/allcodecs.c @@ -319,6 +319,7 @@ static void register_all(void) REGISTER_DECODER(SPEEDHQ, speedhq); REGISTER_DECODER(SRGC, srgc); REGISTER_ENCDEC (SUNRAST, sunrast); + REGISTER_DECODER(LIBRSVG, librsvg); REGISTER_ENCDEC (SVQ1, svq1); REGISTER_DECODER(SVQ3, svq3); REGISTER_ENCDEC (TARGA, targa); diff --git a/libavcodec/librsvgdec.c b/libavcodec/librsvgdec.c new file mode 100644 index 0000000000..29b771c5a3 --- /dev/null +++ b/libavcodec/librsvgdec.c @@ -0,0 +1,127 @@ +/* + * Librsvg rasterization wrapper + * Copyright (c) 2017 Rostislav Pehlivanov + * + * 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_BGRA; + + 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_set_source_rgba(crender, 0.0, 0.0, 0.0, 1.0f); + cairo_paint_with_alpha(crender, 0.0f); + + 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, +};