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