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path: root/ffmpeg_vaapi.c (plain)
blob: d011cacef7d5f3aacc74b53ee12ac5e1ae4bcf20
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 "config.h"
20
21#include "libavutil/avassert.h"
22#include "libavutil/frame.h"
23#include "libavutil/hwcontext.h"
24#include "libavutil/log.h"
25
26#include "ffmpeg.h"
27
28
29static AVClass vaapi_class = {
30 .class_name = "vaapi",
31 .item_name = av_default_item_name,
32 .version = LIBAVUTIL_VERSION_INT,
33};
34
35#define DEFAULT_SURFACES 20
36
37typedef struct VAAPIDecoderContext {
38 const AVClass *class;
39
40 AVBufferRef *device_ref;
41 AVHWDeviceContext *device;
42 AVBufferRef *frames_ref;
43 AVHWFramesContext *frames;
44
45 // The output need not have the same format, width and height as the
46 // decoded frames - the copy for non-direct-mapped access is actually
47 // a whole vpp instance which can do arbitrary scaling and format
48 // conversion.
49 enum AVPixelFormat output_format;
50} VAAPIDecoderContext;
51
52
53static int vaapi_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
54{
55 InputStream *ist = avctx->opaque;
56 VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
57 int err;
58
59 err = av_hwframe_get_buffer(ctx->frames_ref, frame, 0);
60 if (err < 0) {
61 av_log(ctx, AV_LOG_ERROR, "Failed to allocate decoder surface.\n");
62 } else {
63 av_log(ctx, AV_LOG_DEBUG, "Decoder given surface %#x.\n",
64 (unsigned int)(uintptr_t)frame->data[3]);
65 }
66 return err;
67}
68
69static int vaapi_retrieve_data(AVCodecContext *avctx, AVFrame *input)
70{
71 InputStream *ist = avctx->opaque;
72 VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
73 AVFrame *output = 0;
74 int err;
75
76 av_assert0(input->format == AV_PIX_FMT_VAAPI);
77
78 if (ctx->output_format == AV_PIX_FMT_VAAPI) {
79 // Nothing to do.
80 return 0;
81 }
82
83 av_log(ctx, AV_LOG_DEBUG, "Retrieve data from surface %#x.\n",
84 (unsigned int)(uintptr_t)input->data[3]);
85
86 output = av_frame_alloc();
87 if (!output)
88 return AVERROR(ENOMEM);
89
90 output->format = ctx->output_format;
91
92 err = av_hwframe_transfer_data(output, input, 0);
93 if (err < 0) {
94 av_log(ctx, AV_LOG_ERROR, "Failed to transfer data to "
95 "output frame: %d.\n", err);
96 goto fail;
97 }
98
99 err = av_frame_copy_props(output, input);
100 if (err < 0) {
101 av_frame_unref(output);
102 goto fail;
103 }
104
105 av_frame_unref(input);
106 av_frame_move_ref(input, output);
107 av_frame_free(&output);
108
109 return 0;
110
111fail:
112 if (output)
113 av_frame_free(&output);
114 return err;
115}
116
117static void vaapi_decode_uninit(AVCodecContext *avctx)
118{
119 InputStream *ist = avctx->opaque;
120 VAAPIDecoderContext *ctx = ist->hwaccel_ctx;
121
122 if (ctx) {
123 av_buffer_unref(&ctx->frames_ref);
124 av_buffer_unref(&ctx->device_ref);
125 av_free(ctx);
126 }
127
128 av_buffer_unref(&ist->hw_frames_ctx);
129
130 ist->hwaccel_ctx = NULL;
131 ist->hwaccel_uninit = NULL;
132 ist->hwaccel_get_buffer = NULL;
133 ist->hwaccel_retrieve_data = NULL;
134}
135
136int vaapi_decode_init(AVCodecContext *avctx)
137{
138 InputStream *ist = avctx->opaque;
139 VAAPIDecoderContext *ctx;
140 int err;
141 int loglevel = (ist->hwaccel_id != HWACCEL_VAAPI ? AV_LOG_VERBOSE
142 : AV_LOG_ERROR);
143
144 if (ist->hwaccel_ctx)
145 vaapi_decode_uninit(avctx);
146
147 // We have -hwaccel without -vaapi_device, so just initialise here with
148 // the device passed as -hwaccel_device (if -vaapi_device was passed, it
149 // will always have been called before now).
150 if (!hw_device_ctx) {
151 err = vaapi_device_init(ist->hwaccel_device);
152 if (err < 0)
153 return err;
154 }
155
156 ctx = av_mallocz(sizeof(*ctx));
157 if (!ctx)
158 return AVERROR(ENOMEM);
159 ctx->class = &vaapi_class;
160 ist->hwaccel_ctx = ctx;
161
162 ctx->device_ref = av_buffer_ref(hw_device_ctx);
163 ctx->device = (AVHWDeviceContext*)ctx->device_ref->data;
164
165 ctx->output_format = ist->hwaccel_output_format;
166 avctx->pix_fmt = ctx->output_format;
167
168 ctx->frames_ref = av_hwframe_ctx_alloc(ctx->device_ref);
169 if (!ctx->frames_ref) {
170 av_log(ctx, loglevel, "Failed to create VAAPI frame context.\n");
171 err = AVERROR(ENOMEM);
172 goto fail;
173 }
174
175 ctx->frames = (AVHWFramesContext*)ctx->frames_ref->data;
176
177 ctx->frames->format = AV_PIX_FMT_VAAPI;
178 ctx->frames->width = avctx->coded_width;
179 ctx->frames->height = avctx->coded_height;
180
181 // It would be nice if we could query the available formats here,
182 // but unfortunately we don't have a VAConfigID to do it with.
183 // For now, just assume an NV12 format (or P010 if 10-bit).
184 ctx->frames->sw_format = (avctx->sw_pix_fmt == AV_PIX_FMT_YUV420P10 ?
185 AV_PIX_FMT_P010 : AV_PIX_FMT_NV12);
186
187 // For frame-threaded decoding, at least one additional surface
188 // is needed for each thread.
189 ctx->frames->initial_pool_size = DEFAULT_SURFACES;
190 if (avctx->active_thread_type & FF_THREAD_FRAME)
191 ctx->frames->initial_pool_size += avctx->thread_count;
192
193 err = av_hwframe_ctx_init(ctx->frames_ref);
194 if (err < 0) {
195 av_log(ctx, loglevel, "Failed to initialise VAAPI frame "
196 "context: %d\n", err);
197 goto fail;
198 }
199
200 ist->hw_frames_ctx = av_buffer_ref(ctx->frames_ref);
201 if (!ist->hw_frames_ctx) {
202 err = AVERROR(ENOMEM);
203 goto fail;
204 }
205
206 ist->hwaccel_uninit = &vaapi_decode_uninit;
207 ist->hwaccel_get_buffer = &vaapi_get_buffer;
208 ist->hwaccel_retrieve_data = &vaapi_retrieve_data;
209
210 return 0;
211
212fail:
213 vaapi_decode_uninit(avctx);
214 return err;
215}
216
217static AVClass *vaapi_log = &vaapi_class;
218
219av_cold int vaapi_device_init(const char *device)
220{
221 int err;
222
223 av_buffer_unref(&hw_device_ctx);
224
225 err = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI,
226 device, NULL, 0);
227 if (err < 0) {
228 av_log(&vaapi_log, AV_LOG_ERROR, "Failed to create a VAAPI device\n");
229 return err;
230 }
231
232 return 0;
233}
234
generated by cgit at 2024-05-02 06:14:08 (GMT)