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b945fed629
Explicitly identify decoder/encoder wrappers with a common name. This
saves API users from guessing by the name suffix. For example, they
don't have to guess that "h264_qsv" is the h264 QSV implementation, and
instead they can just check the AVCodec .codec and .wrapper_name fields.
Explicitly mark AVCodec entries that are hardware decoders or most
likely hardware decoders with new AV_CODEC_CAPs. The purpose is allowing
API users listing hardware decoders in a more generic way. The proposed
AVCodecHWConfig does not provide this information fully, because it's
concerned with decoder configuration, not information about the fact
whether the hardware is used or not.
AV_CODEC_CAP_HYBRID exists specifically for QSV, which can have software
implementations in case the hardware is not capable.
Based on a patch by Philip Langdale <philipl@overt.org>.
Merges Libav commit 47687a2f8a.
129 lines
4.4 KiB
C
129 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_set_source_rgba(crender, 0.0, 0.0, 0.0, 1.0f);
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cairo_paint_with_alpha(crender, 0.0f);
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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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