• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 "avassert.h"
22 #include "buffer.h"
23 #include "common.h"
24 #include "hwcontext.h"
25 #include "hwcontext_internal.h"
26 #include "imgutils.h"
27 #include "log.h"
28 #include "mem.h"
29 #include "pixdesc.h"
30 #include "pixfmt.h"
31 
32 static const HWContextType * const hw_table[] = {
33 #if CONFIG_CUDA
34     &ff_hwcontext_type_cuda,
35 #endif
36 #if CONFIG_D3D11VA
37     &ff_hwcontext_type_d3d11va,
38 #endif
39 #if CONFIG_LIBDRM
40     &ff_hwcontext_type_drm,
41 #endif
42 #if CONFIG_DXVA2
43     &ff_hwcontext_type_dxva2,
44 #endif
45 #if CONFIG_OPENCL
46     &ff_hwcontext_type_opencl,
47 #endif
48 #if CONFIG_QSV
49     &ff_hwcontext_type_qsv,
50 #endif
51 #if CONFIG_VAAPI
52     &ff_hwcontext_type_vaapi,
53 #endif
54 #if CONFIG_VDPAU
55     &ff_hwcontext_type_vdpau,
56 #endif
57 #if CONFIG_VIDEOTOOLBOX
58     &ff_hwcontext_type_videotoolbox,
59 #endif
60 #if CONFIG_MEDIACODEC
61     &ff_hwcontext_type_mediacodec,
62 #endif
63 #if CONFIG_VULKAN
64     &ff_hwcontext_type_vulkan,
65 #endif
66     NULL,
67 };
68 
69 static const char *const hw_type_names[] = {
70     [AV_HWDEVICE_TYPE_CUDA]   = "cuda",
71     [AV_HWDEVICE_TYPE_DRM]    = "drm",
72     [AV_HWDEVICE_TYPE_DXVA2]  = "dxva2",
73     [AV_HWDEVICE_TYPE_D3D11VA] = "d3d11va",
74     [AV_HWDEVICE_TYPE_OPENCL] = "opencl",
75     [AV_HWDEVICE_TYPE_QSV]    = "qsv",
76     [AV_HWDEVICE_TYPE_VAAPI]  = "vaapi",
77     [AV_HWDEVICE_TYPE_VDPAU]  = "vdpau",
78     [AV_HWDEVICE_TYPE_VIDEOTOOLBOX] = "videotoolbox",
79     [AV_HWDEVICE_TYPE_MEDIACODEC] = "mediacodec",
80     [AV_HWDEVICE_TYPE_VULKAN] = "vulkan",
81 };
82 
av_hwdevice_find_type_by_name(const char * name)83 enum AVHWDeviceType av_hwdevice_find_type_by_name(const char *name)
84 {
85     int type;
86     for (type = 0; type < FF_ARRAY_ELEMS(hw_type_names); type++) {
87         if (hw_type_names[type] && !strcmp(hw_type_names[type], name))
88             return type;
89     }
90     return AV_HWDEVICE_TYPE_NONE;
91 }
92 
av_hwdevice_get_type_name(enum AVHWDeviceType type)93 const char *av_hwdevice_get_type_name(enum AVHWDeviceType type)
94 {
95     if (type > AV_HWDEVICE_TYPE_NONE &&
96         type < FF_ARRAY_ELEMS(hw_type_names))
97         return hw_type_names[type];
98     else
99         return NULL;
100 }
101 
av_hwdevice_iterate_types(enum AVHWDeviceType prev)102 enum AVHWDeviceType av_hwdevice_iterate_types(enum AVHWDeviceType prev)
103 {
104     enum AVHWDeviceType next;
105     int i, set = 0;
106     for (i = 0; hw_table[i]; i++) {
107         if (prev != AV_HWDEVICE_TYPE_NONE && hw_table[i]->type <= prev)
108             continue;
109         if (!set || hw_table[i]->type < next) {
110             next = hw_table[i]->type;
111             set = 1;
112         }
113     }
114     return set ? next : AV_HWDEVICE_TYPE_NONE;
115 }
116 
117 static const AVClass hwdevice_ctx_class = {
118     .class_name = "AVHWDeviceContext",
119     .item_name  = av_default_item_name,
120     .version    = LIBAVUTIL_VERSION_INT,
121 };
122 
hwdevice_ctx_free(void * opaque,uint8_t * data)123 static void hwdevice_ctx_free(void *opaque, uint8_t *data)
124 {
125     AVHWDeviceContext *ctx = (AVHWDeviceContext*)data;
126 
127     /* uninit might still want access the hw context and the user
128      * free() callback might destroy it, so uninit has to be called first */
129     if (ctx->internal->hw_type->device_uninit)
130         ctx->internal->hw_type->device_uninit(ctx);
131 
132     if (ctx->free)
133         ctx->free(ctx);
134 
135     av_buffer_unref(&ctx->internal->source_device);
136 
137     av_freep(&ctx->hwctx);
138     av_freep(&ctx->internal->priv);
139     av_freep(&ctx->internal);
140     av_freep(&ctx);
141 }
142 
av_hwdevice_ctx_alloc(enum AVHWDeviceType type)143 AVBufferRef *av_hwdevice_ctx_alloc(enum AVHWDeviceType type)
144 {
145     AVHWDeviceContext *ctx;
146     AVBufferRef *buf;
147     const HWContextType *hw_type = NULL;
148     int i;
149 
150     for (i = 0; hw_table[i]; i++) {
151         if (hw_table[i]->type == type) {
152             hw_type = hw_table[i];
153             break;
154         }
155     }
156     if (!hw_type)
157         return NULL;
158 
159     ctx = av_mallocz(sizeof(*ctx));
160     if (!ctx)
161         return NULL;
162 
163     ctx->internal = av_mallocz(sizeof(*ctx->internal));
164     if (!ctx->internal)
165         goto fail;
166 
167     if (hw_type->device_priv_size) {
168         ctx->internal->priv = av_mallocz(hw_type->device_priv_size);
169         if (!ctx->internal->priv)
170             goto fail;
171     }
172 
173     if (hw_type->device_hwctx_size) {
174         ctx->hwctx = av_mallocz(hw_type->device_hwctx_size);
175         if (!ctx->hwctx)
176             goto fail;
177     }
178 
179     buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
180                            hwdevice_ctx_free, NULL,
181                            AV_BUFFER_FLAG_READONLY);
182     if (!buf)
183         goto fail;
184 
185     ctx->type     = type;
186     ctx->av_class = &hwdevice_ctx_class;
187 
188     ctx->internal->hw_type = hw_type;
189 
190     return buf;
191 
192 fail:
193     if (ctx->internal)
194         av_freep(&ctx->internal->priv);
195     av_freep(&ctx->internal);
196     av_freep(&ctx->hwctx);
197     av_freep(&ctx);
198     return NULL;
199 }
200 
av_hwdevice_ctx_init(AVBufferRef * ref)201 int av_hwdevice_ctx_init(AVBufferRef *ref)
202 {
203     AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
204     int ret;
205 
206     if (ctx->internal->hw_type->device_init) {
207         ret = ctx->internal->hw_type->device_init(ctx);
208         if (ret < 0)
209             goto fail;
210     }
211 
212     return 0;
213 fail:
214     if (ctx->internal->hw_type->device_uninit)
215         ctx->internal->hw_type->device_uninit(ctx);
216     return ret;
217 }
218 
219 static const AVClass hwframe_ctx_class = {
220     .class_name = "AVHWFramesContext",
221     .item_name  = av_default_item_name,
222     .version    = LIBAVUTIL_VERSION_INT,
223 };
224 
hwframe_ctx_free(void * opaque,uint8_t * data)225 static void hwframe_ctx_free(void *opaque, uint8_t *data)
226 {
227     AVHWFramesContext *ctx = (AVHWFramesContext*)data;
228 
229     if (ctx->internal->pool_internal)
230         av_buffer_pool_uninit(&ctx->internal->pool_internal);
231 
232     if (ctx->internal->hw_type->frames_uninit)
233         ctx->internal->hw_type->frames_uninit(ctx);
234 
235     if (ctx->free)
236         ctx->free(ctx);
237 
238     av_buffer_unref(&ctx->internal->source_frames);
239 
240     av_buffer_unref(&ctx->device_ref);
241 
242     av_freep(&ctx->hwctx);
243     av_freep(&ctx->internal->priv);
244     av_freep(&ctx->internal);
245     av_freep(&ctx);
246 }
247 
av_hwframe_ctx_alloc(AVBufferRef * device_ref_in)248 AVBufferRef *av_hwframe_ctx_alloc(AVBufferRef *device_ref_in)
249 {
250     AVHWDeviceContext *device_ctx = (AVHWDeviceContext*)device_ref_in->data;
251     const HWContextType  *hw_type = device_ctx->internal->hw_type;
252     AVHWFramesContext *ctx;
253     AVBufferRef *buf, *device_ref = NULL;
254 
255     ctx = av_mallocz(sizeof(*ctx));
256     if (!ctx)
257         return NULL;
258 
259     ctx->internal = av_mallocz(sizeof(*ctx->internal));
260     if (!ctx->internal)
261         goto fail;
262 
263     if (hw_type->frames_priv_size) {
264         ctx->internal->priv = av_mallocz(hw_type->frames_priv_size);
265         if (!ctx->internal->priv)
266             goto fail;
267     }
268 
269     if (hw_type->frames_hwctx_size) {
270         ctx->hwctx = av_mallocz(hw_type->frames_hwctx_size);
271         if (!ctx->hwctx)
272             goto fail;
273     }
274 
275     device_ref = av_buffer_ref(device_ref_in);
276     if (!device_ref)
277         goto fail;
278 
279     buf = av_buffer_create((uint8_t*)ctx, sizeof(*ctx),
280                            hwframe_ctx_free, NULL,
281                            AV_BUFFER_FLAG_READONLY);
282     if (!buf)
283         goto fail;
284 
285     ctx->av_class   = &hwframe_ctx_class;
286     ctx->device_ref = device_ref;
287     ctx->device_ctx = device_ctx;
288     ctx->format     = AV_PIX_FMT_NONE;
289     ctx->sw_format  = AV_PIX_FMT_NONE;
290 
291     ctx->internal->hw_type = hw_type;
292 
293     return buf;
294 
295 fail:
296     if (device_ref)
297         av_buffer_unref(&device_ref);
298     if (ctx->internal)
299         av_freep(&ctx->internal->priv);
300     av_freep(&ctx->internal);
301     av_freep(&ctx->hwctx);
302     av_freep(&ctx);
303     return NULL;
304 }
305 
hwframe_pool_prealloc(AVBufferRef * ref)306 static int hwframe_pool_prealloc(AVBufferRef *ref)
307 {
308     AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
309     AVFrame **frames;
310     int i, ret = 0;
311 
312     frames = av_calloc(ctx->initial_pool_size, sizeof(*frames));
313     if (!frames)
314         return AVERROR(ENOMEM);
315 
316     for (i = 0; i < ctx->initial_pool_size; i++) {
317         frames[i] = av_frame_alloc();
318         if (!frames[i])
319             goto fail;
320 
321         ret = av_hwframe_get_buffer(ref, frames[i], 0);
322         if (ret < 0)
323             goto fail;
324     }
325 
326 fail:
327     for (i = 0; i < ctx->initial_pool_size; i++)
328         av_frame_free(&frames[i]);
329     av_freep(&frames);
330 
331     return ret;
332 }
333 
av_hwframe_ctx_init(AVBufferRef * ref)334 int av_hwframe_ctx_init(AVBufferRef *ref)
335 {
336     AVHWFramesContext *ctx = (AVHWFramesContext*)ref->data;
337     const enum AVPixelFormat *pix_fmt;
338     int ret;
339 
340     if (ctx->internal->source_frames) {
341         /* A derived frame context is already initialised. */
342         return 0;
343     }
344 
345     /* validate the pixel format */
346     for (pix_fmt = ctx->internal->hw_type->pix_fmts; *pix_fmt != AV_PIX_FMT_NONE; pix_fmt++) {
347         if (*pix_fmt == ctx->format)
348             break;
349     }
350     if (*pix_fmt == AV_PIX_FMT_NONE) {
351         av_log(ctx, AV_LOG_ERROR,
352                "The hardware pixel format '%s' is not supported by the device type '%s'\n",
353                av_get_pix_fmt_name(ctx->format), ctx->internal->hw_type->name);
354         return AVERROR(ENOSYS);
355     }
356 
357     /* validate the dimensions */
358     ret = av_image_check_size(ctx->width, ctx->height, 0, ctx);
359     if (ret < 0)
360         return ret;
361 
362     /* format-specific init */
363     if (ctx->internal->hw_type->frames_init) {
364         ret = ctx->internal->hw_type->frames_init(ctx);
365         if (ret < 0)
366             goto fail;
367     }
368 
369     if (ctx->internal->pool_internal && !ctx->pool)
370         ctx->pool = ctx->internal->pool_internal;
371 
372     /* preallocate the frames in the pool, if requested */
373     if (ctx->initial_pool_size > 0) {
374         ret = hwframe_pool_prealloc(ref);
375         if (ret < 0)
376             goto fail;
377     }
378 
379     return 0;
380 fail:
381     if (ctx->internal->hw_type->frames_uninit)
382         ctx->internal->hw_type->frames_uninit(ctx);
383     return ret;
384 }
385 
av_hwframe_transfer_get_formats(AVBufferRef * hwframe_ref,enum AVHWFrameTransferDirection dir,enum AVPixelFormat ** formats,int flags)386 int av_hwframe_transfer_get_formats(AVBufferRef *hwframe_ref,
387                                     enum AVHWFrameTransferDirection dir,
388                                     enum AVPixelFormat **formats, int flags)
389 {
390     AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
391 
392     if (!ctx->internal->hw_type->transfer_get_formats)
393         return AVERROR(ENOSYS);
394 
395     return ctx->internal->hw_type->transfer_get_formats(ctx, dir, formats);
396 }
397 
transfer_data_alloc(AVFrame * dst,const AVFrame * src,int flags)398 static int transfer_data_alloc(AVFrame *dst, const AVFrame *src, int flags)
399 {
400     AVHWFramesContext *ctx = (AVHWFramesContext*)src->hw_frames_ctx->data;
401     AVFrame *frame_tmp;
402     int ret = 0;
403 
404     frame_tmp = av_frame_alloc();
405     if (!frame_tmp)
406         return AVERROR(ENOMEM);
407 
408     /* if the format is set, use that
409      * otherwise pick the first supported one */
410     if (dst->format >= 0) {
411         frame_tmp->format = dst->format;
412     } else {
413         enum AVPixelFormat *formats;
414 
415         ret = av_hwframe_transfer_get_formats(src->hw_frames_ctx,
416                                               AV_HWFRAME_TRANSFER_DIRECTION_FROM,
417                                               &formats, 0);
418         if (ret < 0)
419             goto fail;
420         frame_tmp->format = formats[0];
421         av_freep(&formats);
422     }
423     frame_tmp->width  = ctx->width;
424     frame_tmp->height = ctx->height;
425 
426     ret = av_frame_get_buffer(frame_tmp, 0);
427     if (ret < 0)
428         goto fail;
429 
430     ret = av_hwframe_transfer_data(frame_tmp, src, flags);
431     if (ret < 0)
432         goto fail;
433 
434     frame_tmp->width  = src->width;
435     frame_tmp->height = src->height;
436 
437     av_frame_move_ref(dst, frame_tmp);
438 
439 fail:
440     av_frame_free(&frame_tmp);
441     return ret;
442 }
443 
av_hwframe_transfer_data(AVFrame * dst,const AVFrame * src,int flags)444 int av_hwframe_transfer_data(AVFrame *dst, const AVFrame *src, int flags)
445 {
446     AVHWFramesContext *ctx;
447     int ret;
448 
449     if (!dst->buf[0])
450         return transfer_data_alloc(dst, src, flags);
451 
452     /*
453      * Hardware -> Hardware Transfer.
454      * Unlike Software -> Hardware or Hardware -> Software, the transfer
455      * function could be provided by either the src or dst, depending on
456      * the specific combination of hardware.
457      */
458     if (src->hw_frames_ctx && dst->hw_frames_ctx) {
459         AVHWFramesContext *src_ctx =
460             (AVHWFramesContext*)src->hw_frames_ctx->data;
461         AVHWFramesContext *dst_ctx =
462             (AVHWFramesContext*)dst->hw_frames_ctx->data;
463 
464         if (src_ctx->internal->source_frames) {
465             av_log(src_ctx, AV_LOG_ERROR,
466                    "A device with a derived frame context cannot be used as "
467                    "the source of a HW -> HW transfer.");
468             return AVERROR(ENOSYS);
469         }
470 
471         if (dst_ctx->internal->source_frames) {
472             av_log(src_ctx, AV_LOG_ERROR,
473                    "A device with a derived frame context cannot be used as "
474                    "the destination of a HW -> HW transfer.");
475             return AVERROR(ENOSYS);
476         }
477 
478         ret = src_ctx->internal->hw_type->transfer_data_from(src_ctx, dst, src);
479         if (ret == AVERROR(ENOSYS))
480             ret = dst_ctx->internal->hw_type->transfer_data_to(dst_ctx, dst, src);
481         if (ret < 0)
482             return ret;
483     } else {
484         if (src->hw_frames_ctx) {
485             ctx = (AVHWFramesContext*)src->hw_frames_ctx->data;
486 
487             ret = ctx->internal->hw_type->transfer_data_from(ctx, dst, src);
488             if (ret < 0)
489                 return ret;
490         } else if (dst->hw_frames_ctx) {
491             ctx = (AVHWFramesContext*)dst->hw_frames_ctx->data;
492 
493             ret = ctx->internal->hw_type->transfer_data_to(ctx, dst, src);
494             if (ret < 0)
495                 return ret;
496         } else {
497             return AVERROR(ENOSYS);
498         }
499     }
500     return 0;
501 }
502 
av_hwframe_get_buffer(AVBufferRef * hwframe_ref,AVFrame * frame,int flags)503 int av_hwframe_get_buffer(AVBufferRef *hwframe_ref, AVFrame *frame, int flags)
504 {
505     AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
506     int ret;
507 
508     if (ctx->internal->source_frames) {
509         // This is a derived frame context, so we allocate in the source
510         // and map the frame immediately.
511         AVFrame *src_frame;
512 
513         frame->format = ctx->format;
514         frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
515         if (!frame->hw_frames_ctx)
516             return AVERROR(ENOMEM);
517 
518         src_frame = av_frame_alloc();
519         if (!src_frame)
520             return AVERROR(ENOMEM);
521 
522         ret = av_hwframe_get_buffer(ctx->internal->source_frames,
523                                     src_frame, 0);
524         if (ret < 0) {
525             av_frame_free(&src_frame);
526             return ret;
527         }
528 
529         ret = av_hwframe_map(frame, src_frame,
530                              ctx->internal->source_allocation_map_flags);
531         if (ret) {
532             av_log(ctx, AV_LOG_ERROR, "Failed to map frame into derived "
533                    "frame context: %d.\n", ret);
534             av_frame_free(&src_frame);
535             return ret;
536         }
537 
538         // Free the source frame immediately - the mapped frame still
539         // contains a reference to it.
540         av_frame_free(&src_frame);
541 
542         return 0;
543     }
544 
545     if (!ctx->internal->hw_type->frames_get_buffer)
546         return AVERROR(ENOSYS);
547 
548     if (!ctx->pool)
549         return AVERROR(EINVAL);
550 
551     frame->hw_frames_ctx = av_buffer_ref(hwframe_ref);
552     if (!frame->hw_frames_ctx)
553         return AVERROR(ENOMEM);
554 
555     ret = ctx->internal->hw_type->frames_get_buffer(ctx, frame);
556     if (ret < 0) {
557         av_buffer_unref(&frame->hw_frames_ctx);
558         return ret;
559     }
560 
561     frame->extended_data = frame->data;
562 
563     return 0;
564 }
565 
av_hwdevice_hwconfig_alloc(AVBufferRef * ref)566 void *av_hwdevice_hwconfig_alloc(AVBufferRef *ref)
567 {
568     AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
569     const HWContextType  *hw_type = ctx->internal->hw_type;
570 
571     if (hw_type->device_hwconfig_size == 0)
572         return NULL;
573 
574     return av_mallocz(hw_type->device_hwconfig_size);
575 }
576 
av_hwdevice_get_hwframe_constraints(AVBufferRef * ref,const void * hwconfig)577 AVHWFramesConstraints *av_hwdevice_get_hwframe_constraints(AVBufferRef *ref,
578                                                            const void *hwconfig)
579 {
580     AVHWDeviceContext *ctx = (AVHWDeviceContext*)ref->data;
581     const HWContextType  *hw_type = ctx->internal->hw_type;
582     AVHWFramesConstraints *constraints;
583 
584     if (!hw_type->frames_get_constraints)
585         return NULL;
586 
587     constraints = av_mallocz(sizeof(*constraints));
588     if (!constraints)
589         return NULL;
590 
591     constraints->min_width = constraints->min_height = 0;
592     constraints->max_width = constraints->max_height = INT_MAX;
593 
594     if (hw_type->frames_get_constraints(ctx, hwconfig, constraints) >= 0) {
595         return constraints;
596     } else {
597         av_hwframe_constraints_free(&constraints);
598         return NULL;
599     }
600 }
601 
av_hwframe_constraints_free(AVHWFramesConstraints ** constraints)602 void av_hwframe_constraints_free(AVHWFramesConstraints **constraints)
603 {
604     if (*constraints) {
605         av_freep(&(*constraints)->valid_hw_formats);
606         av_freep(&(*constraints)->valid_sw_formats);
607     }
608     av_freep(constraints);
609 }
610 
av_hwdevice_ctx_create(AVBufferRef ** pdevice_ref,enum AVHWDeviceType type,const char * device,AVDictionary * opts,int flags)611 int av_hwdevice_ctx_create(AVBufferRef **pdevice_ref, enum AVHWDeviceType type,
612                            const char *device, AVDictionary *opts, int flags)
613 {
614     AVBufferRef *device_ref = NULL;
615     AVHWDeviceContext *device_ctx;
616     int ret = 0;
617 
618     device_ref = av_hwdevice_ctx_alloc(type);
619     if (!device_ref) {
620         ret = AVERROR(ENOMEM);
621         goto fail;
622     }
623     device_ctx = (AVHWDeviceContext*)device_ref->data;
624 
625     if (!device_ctx->internal->hw_type->device_create) {
626         ret = AVERROR(ENOSYS);
627         goto fail;
628     }
629 
630     ret = device_ctx->internal->hw_type->device_create(device_ctx, device,
631                                                        opts, flags);
632     if (ret < 0)
633         goto fail;
634 
635     ret = av_hwdevice_ctx_init(device_ref);
636     if (ret < 0)
637         goto fail;
638 
639     *pdevice_ref = device_ref;
640     return 0;
641 fail:
642     av_buffer_unref(&device_ref);
643     *pdevice_ref = NULL;
644     return ret;
645 }
646 
av_hwdevice_ctx_create_derived_opts(AVBufferRef ** dst_ref_ptr,enum AVHWDeviceType type,AVBufferRef * src_ref,AVDictionary * options,int flags)647 int av_hwdevice_ctx_create_derived_opts(AVBufferRef **dst_ref_ptr,
648                                         enum AVHWDeviceType type,
649                                         AVBufferRef *src_ref,
650                                         AVDictionary *options, int flags)
651 {
652     AVBufferRef *dst_ref = NULL, *tmp_ref;
653     AVHWDeviceContext *dst_ctx, *tmp_ctx;
654     int ret = 0;
655 
656     tmp_ref = src_ref;
657     while (tmp_ref) {
658         tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
659         if (tmp_ctx->type == type) {
660             dst_ref = av_buffer_ref(tmp_ref);
661             if (!dst_ref) {
662                 ret = AVERROR(ENOMEM);
663                 goto fail;
664             }
665             goto done;
666         }
667         tmp_ref = tmp_ctx->internal->source_device;
668     }
669 
670     dst_ref = av_hwdevice_ctx_alloc(type);
671     if (!dst_ref) {
672         ret = AVERROR(ENOMEM);
673         goto fail;
674     }
675     dst_ctx = (AVHWDeviceContext*)dst_ref->data;
676 
677     tmp_ref = src_ref;
678     while (tmp_ref) {
679         tmp_ctx = (AVHWDeviceContext*)tmp_ref->data;
680         if (dst_ctx->internal->hw_type->device_derive) {
681             ret = dst_ctx->internal->hw_type->device_derive(dst_ctx,
682                                                             tmp_ctx,
683                                                             options,
684                                                             flags);
685             if (ret == 0) {
686                 dst_ctx->internal->source_device = av_buffer_ref(src_ref);
687                 if (!dst_ctx->internal->source_device) {
688                     ret = AVERROR(ENOMEM);
689                     goto fail;
690                 }
691                 ret = av_hwdevice_ctx_init(dst_ref);
692                 if (ret < 0)
693                     goto fail;
694                 goto done;
695             }
696             if (ret != AVERROR(ENOSYS))
697                 goto fail;
698         }
699         tmp_ref = tmp_ctx->internal->source_device;
700     }
701 
702     ret = AVERROR(ENOSYS);
703     goto fail;
704 
705 done:
706     *dst_ref_ptr = dst_ref;
707     return 0;
708 
709 fail:
710     av_buffer_unref(&dst_ref);
711     *dst_ref_ptr = NULL;
712     return ret;
713 }
714 
av_hwdevice_ctx_create_derived(AVBufferRef ** dst_ref_ptr,enum AVHWDeviceType type,AVBufferRef * src_ref,int flags)715 int av_hwdevice_ctx_create_derived(AVBufferRef **dst_ref_ptr,
716                                    enum AVHWDeviceType type,
717                                    AVBufferRef *src_ref, int flags)
718 {
719     return av_hwdevice_ctx_create_derived_opts(dst_ref_ptr, type, src_ref,
720                                                NULL, flags);
721 }
722 
ff_hwframe_unmap(void * opaque,uint8_t * data)723 static void ff_hwframe_unmap(void *opaque, uint8_t *data)
724 {
725     HWMapDescriptor *hwmap = (HWMapDescriptor*)data;
726     AVHWFramesContext *ctx = opaque;
727 
728     if (hwmap->unmap)
729         hwmap->unmap(ctx, hwmap);
730 
731     av_frame_free(&hwmap->source);
732 
733     av_buffer_unref(&hwmap->hw_frames_ctx);
734 
735     av_free(hwmap);
736 }
737 
ff_hwframe_map_create(AVBufferRef * hwframe_ref,AVFrame * dst,const AVFrame * src,void (* unmap)(AVHWFramesContext * ctx,HWMapDescriptor * hwmap),void * priv)738 int ff_hwframe_map_create(AVBufferRef *hwframe_ref,
739                           AVFrame *dst, const AVFrame *src,
740                           void (*unmap)(AVHWFramesContext *ctx,
741                                         HWMapDescriptor *hwmap),
742                           void *priv)
743 {
744     AVHWFramesContext *ctx = (AVHWFramesContext*)hwframe_ref->data;
745     HWMapDescriptor *hwmap;
746     int ret;
747 
748     hwmap = av_mallocz(sizeof(*hwmap));
749     if (!hwmap) {
750         ret = AVERROR(ENOMEM);
751         goto fail;
752     }
753 
754     hwmap->source = av_frame_alloc();
755     if (!hwmap->source) {
756         ret = AVERROR(ENOMEM);
757         goto fail;
758     }
759     ret = av_frame_ref(hwmap->source, src);
760     if (ret < 0)
761         goto fail;
762 
763     hwmap->hw_frames_ctx = av_buffer_ref(hwframe_ref);
764     if (!hwmap->hw_frames_ctx) {
765         ret = AVERROR(ENOMEM);
766         goto fail;
767     }
768 
769     hwmap->unmap = unmap;
770     hwmap->priv  = priv;
771 
772     dst->buf[0] = av_buffer_create((uint8_t*)hwmap, sizeof(*hwmap),
773                                    &ff_hwframe_unmap, ctx, 0);
774     if (!dst->buf[0]) {
775         ret = AVERROR(ENOMEM);
776         goto fail;
777     }
778 
779     return 0;
780 
781 fail:
782     if (hwmap) {
783         av_buffer_unref(&hwmap->hw_frames_ctx);
784         av_frame_free(&hwmap->source);
785     }
786     av_free(hwmap);
787     return ret;
788 }
789 
av_hwframe_map(AVFrame * dst,const AVFrame * src,int flags)790 int av_hwframe_map(AVFrame *dst, const AVFrame *src, int flags)
791 {
792     AVBufferRef    *orig_dst_frames = dst->hw_frames_ctx;
793     enum AVPixelFormat orig_dst_fmt = dst->format;
794     AVHWFramesContext *src_frames, *dst_frames;
795     HWMapDescriptor *hwmap;
796     int ret;
797 
798     if (src->hw_frames_ctx && dst->hw_frames_ctx) {
799         src_frames = (AVHWFramesContext*)src->hw_frames_ctx->data;
800         dst_frames = (AVHWFramesContext*)dst->hw_frames_ctx->data;
801 
802         if ((src_frames == dst_frames &&
803              src->format == dst_frames->sw_format &&
804              dst->format == dst_frames->format) ||
805             (src_frames->internal->source_frames &&
806              src_frames->internal->source_frames->data ==
807              (uint8_t*)dst_frames)) {
808             // This is an unmap operation.  We don't need to directly
809             // do anything here other than fill in the original frame,
810             // because the real unmap will be invoked when the last
811             // reference to the mapped frame disappears.
812             if (!src->buf[0]) {
813                 av_log(src_frames, AV_LOG_ERROR, "Invalid mapping "
814                        "found when attempting unmap.\n");
815                 return AVERROR(EINVAL);
816             }
817             hwmap = (HWMapDescriptor*)src->buf[0]->data;
818             av_frame_unref(dst);
819             return av_frame_ref(dst, hwmap->source);
820         }
821     }
822 
823     if (src->hw_frames_ctx) {
824         src_frames = (AVHWFramesContext*)src->hw_frames_ctx->data;
825 
826         if (src_frames->format == src->format &&
827             src_frames->internal->hw_type->map_from) {
828             ret = src_frames->internal->hw_type->map_from(src_frames,
829                                                           dst, src, flags);
830             if (ret >= 0)
831                 return ret;
832             else if (ret != AVERROR(ENOSYS))
833                 goto fail;
834         }
835     }
836 
837     if (dst->hw_frames_ctx) {
838         dst_frames = (AVHWFramesContext*)dst->hw_frames_ctx->data;
839 
840         if (dst_frames->format == dst->format &&
841             dst_frames->internal->hw_type->map_to) {
842             ret = dst_frames->internal->hw_type->map_to(dst_frames,
843                                                         dst, src, flags);
844             if (ret >= 0)
845                 return ret;
846             else if (ret != AVERROR(ENOSYS))
847                 goto fail;
848         }
849     }
850 
851     return AVERROR(ENOSYS);
852 
853 fail:
854     // if the caller provided dst frames context, it should be preserved
855     // by this function
856     av_assert0(orig_dst_frames == NULL ||
857                orig_dst_frames == dst->hw_frames_ctx);
858 
859     // preserve user-provided dst frame fields, but clean
860     // anything we might have set
861     dst->hw_frames_ctx = NULL;
862     av_frame_unref(dst);
863 
864     dst->hw_frames_ctx = orig_dst_frames;
865     dst->format        = orig_dst_fmt;
866 
867     return ret;
868 }
869 
av_hwframe_ctx_create_derived(AVBufferRef ** derived_frame_ctx,enum AVPixelFormat format,AVBufferRef * derived_device_ctx,AVBufferRef * source_frame_ctx,int flags)870 int av_hwframe_ctx_create_derived(AVBufferRef **derived_frame_ctx,
871                                   enum AVPixelFormat format,
872                                   AVBufferRef *derived_device_ctx,
873                                   AVBufferRef *source_frame_ctx,
874                                   int flags)
875 {
876     AVBufferRef   *dst_ref = NULL;
877     AVHWFramesContext *dst = NULL;
878     AVHWFramesContext *src = (AVHWFramesContext*)source_frame_ctx->data;
879     int ret;
880 
881     if (src->internal->source_frames) {
882         AVHWFramesContext *src_src =
883             (AVHWFramesContext*)src->internal->source_frames->data;
884         AVHWDeviceContext *dst_dev =
885             (AVHWDeviceContext*)derived_device_ctx->data;
886 
887         if (src_src->device_ctx == dst_dev) {
888             // This is actually an unmapping, so we just return a
889             // reference to the source frame context.
890             *derived_frame_ctx =
891                 av_buffer_ref(src->internal->source_frames);
892             if (!*derived_frame_ctx) {
893                 ret = AVERROR(ENOMEM);
894                 goto fail;
895             }
896             return 0;
897         }
898     }
899 
900     dst_ref = av_hwframe_ctx_alloc(derived_device_ctx);
901     if (!dst_ref) {
902         ret = AVERROR(ENOMEM);
903         goto fail;
904     }
905 
906     dst = (AVHWFramesContext*)dst_ref->data;
907 
908     dst->format    = format;
909     dst->sw_format = src->sw_format;
910     dst->width     = src->width;
911     dst->height    = src->height;
912 
913     dst->internal->source_frames = av_buffer_ref(source_frame_ctx);
914     if (!dst->internal->source_frames) {
915         ret = AVERROR(ENOMEM);
916         goto fail;
917     }
918 
919     dst->internal->source_allocation_map_flags =
920         flags & (AV_HWFRAME_MAP_READ      |
921                  AV_HWFRAME_MAP_WRITE     |
922                  AV_HWFRAME_MAP_OVERWRITE |
923                  AV_HWFRAME_MAP_DIRECT);
924 
925     ret = AVERROR(ENOSYS);
926     if (src->internal->hw_type->frames_derive_from)
927         ret = src->internal->hw_type->frames_derive_from(dst, src, flags);
928     if (ret == AVERROR(ENOSYS) &&
929         dst->internal->hw_type->frames_derive_to)
930         ret = dst->internal->hw_type->frames_derive_to(dst, src, flags);
931     if (ret == AVERROR(ENOSYS))
932         ret = 0;
933     if (ret)
934         goto fail;
935 
936     *derived_frame_ctx = dst_ref;
937     return 0;
938 
939 fail:
940     if (dst)
941         av_buffer_unref(&dst->internal->source_frames);
942     av_buffer_unref(&dst_ref);
943     return ret;
944 }
945 
ff_hwframe_map_replace(AVFrame * dst,const AVFrame * src)946 int ff_hwframe_map_replace(AVFrame *dst, const AVFrame *src)
947 {
948     HWMapDescriptor *hwmap = (HWMapDescriptor*)dst->buf[0]->data;
949     av_frame_unref(hwmap->source);
950     return av_frame_ref(hwmap->source, src);
951 }
952