aboutsummaryrefslogtreecommitdiffstats
path: root/libavfilter/vf_hwupload.c
blob: 08af2dd49fe6a236539d711467f58b8fc2f16166 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
/*
 * 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 "libavutil/buffer.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_internal.h"
#include "libavutil/log.h"
#include "libavutil/pixdesc.h"
#include "libavutil/opt.h"

#include "avfilter.h"
#include "formats.h"
#include "internal.h"
#include "video.h"

typedef struct HWUploadContext {
    const AVClass *class;

    AVBufferRef       *hwdevice_ref;
    AVHWDeviceContext *hwdevice;

    AVBufferRef       *hwframes_ref;
    AVHWFramesContext *hwframes;
} HWUploadContext;

static int hwupload_query_formats(AVFilterContext *avctx)
{
    HWUploadContext *ctx = avctx->priv;
    AVHWFramesConstraints *constraints = NULL;
    const enum AVPixelFormat *input_pix_fmts, *output_pix_fmts;
    AVFilterFormats *input_formats = NULL;
    int err, i;

    if (!avctx->hw_device_ctx) {
        av_log(ctx, AV_LOG_ERROR, "A hardware device reference is required "
               "to upload frames to.\n");
        return AVERROR(EINVAL);
    }

    ctx->hwdevice_ref = av_buffer_ref(avctx->hw_device_ctx);
    if (!ctx->hwdevice_ref)
        return AVERROR(ENOMEM);
    ctx->hwdevice = (AVHWDeviceContext*)ctx->hwdevice_ref->data;

    constraints = av_hwdevice_get_hwframe_constraints(ctx->hwdevice_ref, NULL);
    if (!constraints) {
        err = AVERROR(EINVAL);
        goto fail;
    }

    input_pix_fmts  = constraints->valid_sw_formats;
    output_pix_fmts = constraints->valid_hw_formats;

    input_formats = ff_make_format_list(output_pix_fmts);
    if (!input_formats) {
        err = AVERROR(ENOMEM);
        goto fail;
    }
    if (input_pix_fmts) {
        for (i = 0; input_pix_fmts[i] != AV_PIX_FMT_NONE; i++) {
            err = ff_add_format(&input_formats, input_pix_fmts[i]);
            if (err < 0) {
                ff_formats_unref(&input_formats);
                goto fail;
            }
        }
    }

    ff_formats_ref(input_formats, &avctx->inputs[0]->out_formats);

    ff_formats_ref(ff_make_format_list(output_pix_fmts),
                   &avctx->outputs[0]->in_formats);

    av_hwframe_constraints_free(&constraints);
    return 0;

fail:
    av_buffer_unref(&ctx->hwdevice_ref);
    av_hwframe_constraints_free(&constraints);
    return err;
}

static int hwupload_config_output(AVFilterLink *outlink)
{
    AVFilterContext *avctx = outlink->src;
    AVFilterLink   *inlink = avctx->inputs[0];
    HWUploadContext   *ctx = avctx->priv;
    int err;

    av_buffer_unref(&ctx->hwframes_ref);

    if (inlink->format == outlink->format) {
        // The input is already a hardware format, so we just want to
        // pass through the input frames in their own hardware context.
        if (!inlink->hw_frames_ctx) {
            av_log(ctx, AV_LOG_ERROR, "No input hwframe context.\n");
            return AVERROR(EINVAL);
        }

        outlink->hw_frames_ctx = av_buffer_ref(inlink->hw_frames_ctx);
        if (!outlink->hw_frames_ctx)
            return AVERROR(ENOMEM);

        return 0;
    }

    ctx->hwframes_ref = av_hwframe_ctx_alloc(ctx->hwdevice_ref);
    if (!ctx->hwframes_ref)
        return AVERROR(ENOMEM);

    ctx->hwframes = (AVHWFramesContext*)ctx->hwframes_ref->data;

    av_log(ctx, AV_LOG_DEBUG, "Surface format is %s.\n",
           av_get_pix_fmt_name(inlink->format));

    ctx->hwframes->format    = outlink->format;
    ctx->hwframes->sw_format = inlink->format;
    ctx->hwframes->width     = inlink->w;
    ctx->hwframes->height    = inlink->h;

    err = av_hwframe_ctx_init(ctx->hwframes_ref);
    if (err < 0)
        goto fail;

    outlink->hw_frames_ctx = av_buffer_ref(ctx->hwframes_ref);
    if (!outlink->hw_frames_ctx) {
        err = AVERROR(ENOMEM);
        goto fail;
    }

    return 0;

fail:
    av_buffer_unref(&ctx->hwframes_ref);
    return err;
}

static int hwupload_filter_frame(AVFilterLink *link, AVFrame *input)
{
    AVFilterContext *avctx = link->dst;
    AVFilterLink  *outlink = avctx->outputs[0];
    HWUploadContext   *ctx = avctx->priv;
    AVFrame *output = NULL;
    int err;

    if (input->format == outlink->format)
        return ff_filter_frame(outlink, input);

    output = av_frame_alloc();
    if (!output) {
        err = AVERROR(ENOMEM);
        goto fail;
    }

    err = av_hwframe_get_buffer(ctx->hwframes_ref, output, 0);
    if (err < 0) {
        av_log(ctx, AV_LOG_ERROR, "Failed to allocate frame to upload to.\n");
        goto fail;
    }

    output->width  = input->width;
    output->height = input->height;

    err = av_hwframe_transfer_data(output, input, 0);
    if (err < 0) {
        av_log(ctx, AV_LOG_ERROR, "Failed to upload frame: %d.\n", err);
        goto fail;
    }

    err = av_frame_copy_props(output, input);
    if (err < 0)
        goto fail;

    av_frame_free(&input);

    return ff_filter_frame(outlink, output);

fail:
    av_frame_free(&input);
    av_frame_free(&output);
    return err;
}

static av_cold void hwupload_uninit(AVFilterContext *avctx)
{
    HWUploadContext *ctx = avctx->priv;

    av_buffer_unref(&ctx->hwframes_ref);
    av_buffer_unref(&ctx->hwdevice_ref);
}

static const AVClass hwupload_class = {
    .class_name = "hwupload",
    .item_name  = av_default_item_name,
    .option     = NULL,
    .version    = LIBAVUTIL_VERSION_INT,
};

static const AVFilterPad hwupload_inputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .filter_frame = hwupload_filter_frame,
    },
    { NULL }
};

static const AVFilterPad hwupload_outputs[] = {
    {
        .name         = "default",
        .type         = AVMEDIA_TYPE_VIDEO,
        .config_props = hwupload_config_output,
    },
    { NULL }
};

AVFilter ff_vf_hwupload = {
    .name          = "hwupload",
    .description   = NULL_IF_CONFIG_SMALL("Upload a normal frame to a hardware frame"),
    .uninit        = hwupload_uninit,
    .query_formats = hwupload_query_formats,
    .priv_size     = sizeof(HWUploadContext),
    .priv_class    = &hwupload_class,
    .inputs        = hwupload_inputs,
    .outputs       = hwupload_outputs,
};