vda.c
Go to the documentation of this file.
1 /*
2  * VDA hardware acceleration
3  *
4  * copyright (c) 2011 Sebastien Zwickert
5  *
6  * This file is part of Libav.
7  *
8  * Libav is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * Libav is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with Libav; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <pthread.h>
24 #include <CoreFoundation/CFDictionary.h>
25 #include <CoreFoundation/CFNumber.h>
26 #include <CoreFoundation/CFData.h>
27 #include <CoreFoundation/CFString.h>
28 
29 #include "libavutil/avutil.h"
30 #include "vda_internal.h"
31 
32 /* helper to create a dictionary according to the given pts */
33 static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
34 {
35  CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
36  CFNumberRef value = CFNumberCreate(kCFAllocatorDefault,
37  kCFNumberSInt64Type, &i_pts);
38  CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
39  (const void **)&key,
40  (const void **)&value,
41  1,
42  &kCFTypeDictionaryKeyCallBacks,
43  &kCFTypeDictionaryValueCallBacks);
44  CFRelease(value);
45  return user_info;
46 }
47 
48 /* helper to retrieve the pts from the given dictionary */
49 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
50 {
51  CFNumberRef pts;
52  int64_t outValue = 0;
53 
54  if (!user_info)
55  return 0;
56 
57  pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
58 
59  if (pts)
60  CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
61 
62  return outValue;
63 }
64 
65 /* Remove and release all frames from the queue. */
66 static void vda_clear_queue(struct vda_context *vda_ctx)
67 {
68  vda_frame *top_frame;
69 
71 
72  while (vda_ctx->queue) {
73  top_frame = vda_ctx->queue;
74  vda_ctx->queue = top_frame->next_frame;
75  ff_vda_release_vda_frame(top_frame);
76  }
77 
79 }
80 
81 /* Decoder callback that adds the VDA frame to the queue in display order. */
82 static void vda_decoder_callback(void *vda_hw_ctx,
83  CFDictionaryRef user_info,
84  OSStatus status,
85  uint32_t infoFlags,
86  CVImageBufferRef image_buffer)
87 {
88  struct vda_context *vda_ctx = vda_hw_ctx;
89  vda_frame *new_frame;
90  vda_frame *queue_walker;
91 
92  if (!image_buffer)
93  return;
94 
95  if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
96  return;
97 
98  if (!(new_frame = av_mallocz(sizeof(vda_frame))))
99  return;
100  new_frame->next_frame = NULL;
101  new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
102  new_frame->pts = vda_pts_from_dictionary(user_info);
103 
104  pthread_mutex_lock(&vda_ctx->queue_mutex);
105 
106  queue_walker = vda_ctx->queue;
107 
108  if (!queue_walker || new_frame->pts < queue_walker->pts) {
109  /* we have an empty queue, or this frame earlier than the current queue head */
110  new_frame->next_frame = queue_walker;
111  vda_ctx->queue = new_frame;
112  } else {
113  /* walk the queue and insert this frame where it belongs in display order */
114  vda_frame *next_frame;
115  while (1) {
116  next_frame = queue_walker->next_frame;
117  if (!next_frame || new_frame->pts < next_frame->pts) {
118  new_frame->next_frame = next_frame;
119  queue_walker->next_frame = new_frame;
120  break;
121  }
122  queue_walker = next_frame;
123  }
124  }
125 
127 }
128 
129 int ff_vda_create_decoder(struct vda_context *vda_ctx,
130  uint8_t *extradata,
131  int extradata_size)
132 {
133  OSStatus status = kVDADecoderNoErr;
134  CFNumberRef height;
135  CFNumberRef width;
136  CFNumberRef format;
137  CFDataRef avc_data;
138  CFMutableDictionaryRef config_info;
139  CFMutableDictionaryRef buffer_attributes;
140  CFMutableDictionaryRef io_surface_properties;
141  CFNumberRef cv_pix_fmt;
142 
143  pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
144 
145  config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
146  4,
147  &kCFTypeDictionaryKeyCallBacks,
148  &kCFTypeDictionaryValueCallBacks);
149 
150  height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
151  width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
152  format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
153  avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
154 
155  CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
156  CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
157  CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
158  CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
159 
160  buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
161  2,
162  &kCFTypeDictionaryKeyCallBacks,
163  &kCFTypeDictionaryValueCallBacks);
164  io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
165  0,
166  &kCFTypeDictionaryKeyCallBacks,
167  &kCFTypeDictionaryValueCallBacks);
168  cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault,
169  kCFNumberSInt32Type,
170  &vda_ctx->cv_pix_fmt_type);
171  CFDictionarySetValue(buffer_attributes,
172  kCVPixelBufferPixelFormatTypeKey,
173  cv_pix_fmt);
174  CFDictionarySetValue(buffer_attributes,
175  kCVPixelBufferIOSurfacePropertiesKey,
176  io_surface_properties);
177 
178  status = VDADecoderCreate(config_info,
179  buffer_attributes,
181  vda_ctx,
182  &vda_ctx->decoder);
183 
184  CFRelease(height);
185  CFRelease(width);
186  CFRelease(format);
187  CFRelease(avc_data);
188  CFRelease(config_info);
189  CFRelease(io_surface_properties);
190  CFRelease(cv_pix_fmt);
191  CFRelease(buffer_attributes);
192 
193  if (kVDADecoderNoErr != status)
194  return status;
195 
196  return 0;
197 }
198 
200 {
201  OSStatus status = kVDADecoderNoErr;
202 
203  if (vda_ctx->decoder)
204  status = VDADecoderDestroy(vda_ctx->decoder);
205 
206  vda_clear_queue(vda_ctx);
207 
209 
210  if (kVDADecoderNoErr != status)
211  return status;
212 
213  return 0;
214 }
215 
217 {
218  vda_frame *top_frame;
219 
220  if (!vda_ctx->queue)
221  return NULL;
222 
223  pthread_mutex_lock(&vda_ctx->queue_mutex);
224  top_frame = vda_ctx->queue;
225  vda_ctx->queue = top_frame->next_frame;
227 
228  return top_frame;
229 }
230 
232 {
233  if (frame) {
234  CVPixelBufferRelease(frame->cv_buffer);
235  av_freep(&frame);
236  }
237 }
238 
239 int ff_vda_decoder_decode(struct vda_context *vda_ctx,
240  uint8_t *bitstream,
241  int bitstream_size,
242  int64_t frame_pts)
243 {
244  OSStatus status = kVDADecoderNoErr;
245  CFDictionaryRef user_info;
246  CFDataRef coded_frame;
247 
248  coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
249  user_info = vda_dictionary_with_pts(frame_pts);
250  status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
251 
252  CFRelease(user_info);
253  CFRelease(coded_frame);
254 
255  if (kVDADecoderNoErr != status)
256  return status;
257 
258  return 0;
259 }