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path: root/libavfilter/vf_hwdownload.c (plain)
blob: 33af30cf4025e70de5d5a8b7a5c70acf1079ef8d
1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "libavutil/buffer.h"
20#include "libavutil/hwcontext.h"
21#include "libavutil/log.h"
22#include "libavutil/mem.h"
23#include "libavutil/opt.h"
24#include "libavutil/pixdesc.h"
25
26#include "avfilter.h"
27#include "formats.h"
28#include "internal.h"
29#include "video.h"
30
31typedef struct HWDownloadContext {
32 const AVClass *class;
33
34 AVBufferRef *hwframes_ref;
35 AVHWFramesContext *hwframes;
36} HWDownloadContext;
37
38static int hwdownload_query_formats(AVFilterContext *avctx)
39{
40 AVFilterFormats *infmts = NULL;
41 AVFilterFormats *outfmts = NULL;
42 const AVPixFmtDescriptor *desc;
43 int err;
44
45 for (desc = av_pix_fmt_desc_next(NULL); desc;
46 desc = av_pix_fmt_desc_next(desc)) {
47 if (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)
48 err = ff_add_format(&infmts, av_pix_fmt_desc_get_id(desc));
49 else
50 err = ff_add_format(&outfmts, av_pix_fmt_desc_get_id(desc));
51 if (err) {
52 ff_formats_unref(&infmts);
53 ff_formats_unref(&outfmts);
54 return err;
55 }
56 }
57
58 if ((err = ff_formats_ref(infmts, &avctx->inputs[0]->out_formats)) < 0 ||
59 (err = ff_formats_ref(outfmts, &avctx->outputs[0]->in_formats)) < 0)
60 return err;
61
62 return 0;
63}
64
65static int hwdownload_config_input(AVFilterLink *inlink)
66{
67 AVFilterContext *avctx = inlink->dst;
68 HWDownloadContext *ctx = avctx->priv;
69
70 av_buffer_unref(&ctx->hwframes_ref);
71
72 if (!inlink->hw_frames_ctx) {
73 av_log(ctx, AV_LOG_ERROR, "The input must have a hardware frame "
74 "reference.\n");
75 return AVERROR(EINVAL);
76 }
77
78 ctx->hwframes_ref = av_buffer_ref(inlink->hw_frames_ctx);
79 if (!ctx->hwframes_ref)
80 return AVERROR(ENOMEM);
81
82 ctx->hwframes = (AVHWFramesContext*)ctx->hwframes_ref->data;
83
84 return 0;
85}
86
87static int hwdownload_config_output(AVFilterLink *outlink)
88{
89 AVFilterContext *avctx = outlink->src;
90 AVFilterLink *inlink = avctx->inputs[0];
91 HWDownloadContext *ctx = avctx->priv;
92 enum AVPixelFormat *formats;
93 int err, i, found;
94
95 if (!ctx->hwframes_ref)
96 return AVERROR(EINVAL);
97
98 err = av_hwframe_transfer_get_formats(ctx->hwframes_ref,
99 AV_HWFRAME_TRANSFER_DIRECTION_FROM,
100 &formats, 0);
101 if (err < 0)
102 return err;
103
104 found = 0;
105 for (i = 0; formats[i] != AV_PIX_FMT_NONE; i++) {
106 if (formats[i] == outlink->format) {
107 found = 1;
108 break;
109 }
110 }
111 av_freep(&formats);
112
113 if (!found) {
114 av_log(ctx, AV_LOG_ERROR, "Invalid output format %s for hwframe "
115 "download.\n", av_get_pix_fmt_name(outlink->format));
116 return AVERROR(EINVAL);
117 }
118
119 outlink->w = inlink->w;
120 outlink->h = inlink->h;
121
122 return 0;
123}
124
125static int hwdownload_filter_frame(AVFilterLink *link, AVFrame *input)
126{
127 AVFilterContext *avctx = link->dst;
128 AVFilterLink *outlink = avctx->outputs[0];
129 HWDownloadContext *ctx = avctx->priv;
130 AVFrame *output = NULL;
131 int err;
132
133 if (!ctx->hwframes_ref || !input->hw_frames_ctx) {
134 av_log(ctx, AV_LOG_ERROR, "Input frames must have hardware context.\n");
135 err = AVERROR(EINVAL);
136 goto fail;
137 }
138 if ((void*)ctx->hwframes != input->hw_frames_ctx->data) {
139 av_log(ctx, AV_LOG_ERROR, "Input frame is not the in the configured "
140 "hwframe context.\n");
141 err = AVERROR(EINVAL);
142 goto fail;
143 }
144
145 output = ff_get_video_buffer(outlink, ctx->hwframes->width,
146 ctx->hwframes->height);
147 if (!output) {
148 err = AVERROR(ENOMEM);
149 goto fail;
150 }
151
152 err = av_hwframe_transfer_data(output, input, 0);
153 if (err < 0) {
154 av_log(ctx, AV_LOG_ERROR, "Failed to download frame: %d.\n", err);
155 goto fail;
156 }
157
158 output->width = outlink->w;
159 output->height = outlink->h;
160
161 err = av_frame_copy_props(output, input);
162 if (err < 0)
163 goto fail;
164
165 av_frame_free(&input);
166
167 return ff_filter_frame(avctx->outputs[0], output);
168
169fail:
170 av_frame_free(&input);
171 av_frame_free(&output);
172 return err;
173}
174
175static av_cold void hwdownload_uninit(AVFilterContext *avctx)
176{
177 HWDownloadContext *ctx = avctx->priv;
178
179 av_buffer_unref(&ctx->hwframes_ref);
180}
181
182static const AVClass hwdownload_class = {
183 .class_name = "hwdownload",
184 .item_name = av_default_item_name,
185 .option = NULL,
186 .version = LIBAVUTIL_VERSION_INT,
187};
188
189static const AVFilterPad hwdownload_inputs[] = {
190 {
191 .name = "default",
192 .type = AVMEDIA_TYPE_VIDEO,
193 .config_props = hwdownload_config_input,
194 .filter_frame = hwdownload_filter_frame,
195 },
196 { NULL }
197};
198
199static const AVFilterPad hwdownload_outputs[] = {
200 {
201 .name = "default",
202 .type = AVMEDIA_TYPE_VIDEO,
203 .config_props = hwdownload_config_output,
204 },
205 { NULL }
206};
207
208AVFilter ff_vf_hwdownload = {
209 .name = "hwdownload",
210 .description = NULL_IF_CONFIG_SMALL("Download a hardware frame to a normal frame"),
211 .uninit = hwdownload_uninit,
212 .query_formats = hwdownload_query_formats,
213 .priv_size = sizeof(HWDownloadContext),
214 .priv_class = &hwdownload_class,
215 .inputs = hwdownload_inputs,
216 .outputs = hwdownload_outputs,
217 .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
218};
219
generated by cgit at 2024-05-17 06:56:57 (GMT)