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vda_h264.c
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1 /*
2  * VDA H264 HW acceleration.
3  *
4  * copyright (c) 2011 Sebastien Zwickert
5  *
6  * This file is part of FFmpeg.
7  *
8  * FFmpeg 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  * FFmpeg 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 FFmpeg; if not, write to the Free Software
20  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21  */
22 
23 #include <CoreFoundation/CFDictionary.h>
24 #include <CoreFoundation/CFNumber.h>
25 #include <CoreFoundation/CFData.h>
26 
27 #include "vda.h"
28 #include "libavutil/avutil.h"
29 #include "h264.h"
30 
31 #if FF_API_VDA_ASYNC
32 #include <CoreFoundation/CFString.h>
33 
34 /* Helper to create a dictionary according to the given pts. */
35 static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
36 {
37  CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
38  CFNumberRef value = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &i_pts);
39  CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
40  (const void **)&key,
41  (const void **)&value,
42  1,
43  &kCFTypeDictionaryKeyCallBacks,
44  &kCFTypeDictionaryValueCallBacks);
45  CFRelease(value);
46  return user_info;
47 }
48 
49 /* Helper to retrieve the pts from the given dictionary. */
50 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
51 {
52  CFNumberRef pts;
53  int64_t outValue = 0;
54 
55  if (!user_info)
56  return 0;
57 
58  pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
59 
60  if (pts)
61  CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
62 
63  return outValue;
64 }
65 
66 /* Removes and releases all frames from the queue. */
67 static void vda_clear_queue(struct vda_context *vda_ctx)
68 {
69  vda_frame *top_frame;
70 
71  pthread_mutex_lock(&vda_ctx->queue_mutex);
72 
73  while (vda_ctx->queue) {
74  top_frame = vda_ctx->queue;
75  vda_ctx->queue = top_frame->next_frame;
76  ff_vda_release_vda_frame(top_frame);
77  }
78 
79  pthread_mutex_unlock(&vda_ctx->queue_mutex);
80 }
81 
82 static int vda_decoder_decode(struct vda_context *vda_ctx,
83  uint8_t *bitstream,
84  int bitstream_size,
85  int64_t frame_pts)
86 {
87  OSStatus status;
88  CFDictionaryRef user_info;
89  CFDataRef coded_frame;
90 
91  coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
92  user_info = vda_dictionary_with_pts(frame_pts);
93 
94  status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
95 
96  CFRelease(user_info);
97  CFRelease(coded_frame);
98 
99  return status;
100 }
101 
102 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
103 {
104  vda_frame *top_frame;
105 
106  if (!vda_ctx->queue)
107  return NULL;
108 
109  pthread_mutex_lock(&vda_ctx->queue_mutex);
110  top_frame = vda_ctx->queue;
111  vda_ctx->queue = top_frame->next_frame;
112  pthread_mutex_unlock(&vda_ctx->queue_mutex);
113 
114  return top_frame;
115 }
116 
117 void ff_vda_release_vda_frame(vda_frame *frame)
118 {
119  if (frame) {
120  CVPixelBufferRelease(frame->cv_buffer);
121  av_freep(&frame);
122  }
123 }
124 #endif
125 
126 /* Decoder callback that adds the vda frame to the queue in display order. */
127 static void vda_decoder_callback (void *vda_hw_ctx,
128  CFDictionaryRef user_info,
129  OSStatus status,
130  uint32_t infoFlags,
131  CVImageBufferRef image_buffer)
132 {
133  struct vda_context *vda_ctx = vda_hw_ctx;
134 
135  if (!image_buffer)
136  return;
137 
138  if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
139  return;
140 
141  if (vda_ctx->use_sync_decoding) {
142  vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
143  } else {
144  vda_frame *new_frame;
145  vda_frame *queue_walker;
146 
147  if (!(new_frame = av_mallocz(sizeof(*new_frame))))
148  return;
149 
150  new_frame->next_frame = NULL;
151  new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
152  new_frame->pts = vda_pts_from_dictionary(user_info);
153 
154  pthread_mutex_lock(&vda_ctx->queue_mutex);
155 
156  queue_walker = vda_ctx->queue;
157 
158  if (!queue_walker || (new_frame->pts < queue_walker->pts)) {
159  /* we have an empty queue, or this frame earlier than the current queue head */
160  new_frame->next_frame = queue_walker;
161  vda_ctx->queue = new_frame;
162  } else {
163  /* walk the queue and insert this frame where it belongs in display order */
164  vda_frame *next_frame;
165 
166  while (1) {
167  next_frame = queue_walker->next_frame;
168 
169  if (!next_frame || (new_frame->pts < next_frame->pts)) {
170  new_frame->next_frame = next_frame;
171  queue_walker->next_frame = new_frame;
172  break;
173  }
174  queue_walker = next_frame;
175  }
176  }
177 
178  pthread_mutex_unlock(&vda_ctx->queue_mutex);
179  }
180 }
181 
182 static int vda_sync_decode(struct vda_context *vda_ctx)
183 {
184  OSStatus status;
185  CFDataRef coded_frame;
186  uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
187 
188  coded_frame = CFDataCreate(kCFAllocatorDefault,
189  vda_ctx->priv_bitstream,
190  vda_ctx->priv_bitstream_size);
191 
192  status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
193 
194  if (kVDADecoderNoErr == status)
195  status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
196 
197  CFRelease(coded_frame);
198 
199  return status;
200 }
201 
202 
203 static int vda_h264_start_frame(AVCodecContext *avctx,
204  av_unused const uint8_t *buffer,
205  av_unused uint32_t size)
206 {
207  struct vda_context *vda_ctx = avctx->hwaccel_context;
208 
209  if (!vda_ctx->decoder)
210  return -1;
211 
212  vda_ctx->priv_bitstream_size = 0;
213 
214  return 0;
215 }
216 
217 static int vda_h264_decode_slice(AVCodecContext *avctx,
218  const uint8_t *buffer,
219  uint32_t size)
220 {
221  struct vda_context *vda_ctx = avctx->hwaccel_context;
222  void *tmp;
223 
224  if (!vda_ctx->decoder)
225  return -1;
226 
227  tmp = av_fast_realloc(vda_ctx->priv_bitstream,
228  &vda_ctx->priv_allocated_size,
229  vda_ctx->priv_bitstream_size + size + 4);
230  if (!tmp)
231  return AVERROR(ENOMEM);
232 
233  vda_ctx->priv_bitstream = tmp;
234 
235  AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
236  memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
237 
238  vda_ctx->priv_bitstream_size += size + 4;
239 
240  return 0;
241 }
242 
243 static int vda_h264_end_frame(AVCodecContext *avctx)
244 {
245  H264Context *h = avctx->priv_data;
246  struct vda_context *vda_ctx = avctx->hwaccel_context;
247  AVFrame *frame = &h->cur_pic_ptr->f;
248  int status;
249 
250  if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
251  return -1;
252 
253  if (vda_ctx->use_sync_decoding) {
254  status = vda_sync_decode(vda_ctx);
255  frame->data[3] = (void*)vda_ctx->cv_buffer;
256  } else {
257  status = vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
258  vda_ctx->priv_bitstream_size,
259  frame->reordered_opaque);
260  }
261 
262  if (status)
263  av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
264 
265  return status;
266 }
267 
268 int ff_vda_create_decoder(struct vda_context *vda_ctx,
269  uint8_t *extradata,
270  int extradata_size)
271 {
272  OSStatus status;
273  CFNumberRef height;
274  CFNumberRef width;
275  CFNumberRef format;
276  CFDataRef avc_data;
277  CFMutableDictionaryRef config_info;
278  CFMutableDictionaryRef buffer_attributes;
279  CFMutableDictionaryRef io_surface_properties;
280  CFNumberRef cv_pix_fmt;
281 
282  vda_ctx->priv_bitstream = NULL;
283  vda_ctx->priv_allocated_size = 0;
284 
285 #if FF_API_VDA_ASYNC
286  pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
287 #endif
288 
289  /* Each VCL NAL in the bitstream sent to the decoder
290  * is preceded by a 4 bytes length header.
291  * Change the avcC atom header if needed, to signal headers of 4 bytes. */
292  if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
293  uint8_t *rw_extradata;
294 
295  if (!(rw_extradata = av_malloc(extradata_size)))
296  return AVERROR(ENOMEM);
297 
298  memcpy(rw_extradata, extradata, extradata_size);
299 
300  rw_extradata[4] |= 0x03;
301 
302  avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
303 
304  av_freep(&rw_extradata);
305  } else {
306  avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
307  }
308 
309  config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
310  4,
311  &kCFTypeDictionaryKeyCallBacks,
312  &kCFTypeDictionaryValueCallBacks);
313 
314  height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
315  width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
316  format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
317 
318  CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
319  CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
320  CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
321  CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
322 
323  buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
324  2,
325  &kCFTypeDictionaryKeyCallBacks,
326  &kCFTypeDictionaryValueCallBacks);
327  io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
328  0,
329  &kCFTypeDictionaryKeyCallBacks,
330  &kCFTypeDictionaryValueCallBacks);
331  cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault,
332  kCFNumberSInt32Type,
333  &vda_ctx->cv_pix_fmt_type);
334  CFDictionarySetValue(buffer_attributes,
335  kCVPixelBufferPixelFormatTypeKey,
336  cv_pix_fmt);
337  CFDictionarySetValue(buffer_attributes,
338  kCVPixelBufferIOSurfacePropertiesKey,
339  io_surface_properties);
340 
341  status = VDADecoderCreate(config_info,
342  buffer_attributes,
343  vda_decoder_callback,
344  vda_ctx,
345  &vda_ctx->decoder);
346 
347  CFRelease(height);
348  CFRelease(width);
349  CFRelease(format);
350  CFRelease(avc_data);
351  CFRelease(config_info);
352  CFRelease(io_surface_properties);
353  CFRelease(cv_pix_fmt);
354  CFRelease(buffer_attributes);
355 
356  return status;
357 }
358 
359 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
360 {
361  OSStatus status = kVDADecoderNoErr;
362 
363  if (vda_ctx->decoder)
364  status = VDADecoderDestroy(vda_ctx->decoder);
365 
366 #if FF_API_VDA_ASYNC
367  vda_clear_queue(vda_ctx);
368  pthread_mutex_destroy(&vda_ctx->queue_mutex);
369 #endif
370  av_freep(&vda_ctx->priv_bitstream);
371 
372  return status;
373 }
374 
375 AVHWAccel ff_h264_vda_hwaccel = {
376  .name = "h264_vda",
377  .type = AVMEDIA_TYPE_VIDEO,
378  .id = AV_CODEC_ID_H264,
379  .pix_fmt = AV_PIX_FMT_VDA_VLD,
380  .start_frame = vda_h264_start_frame,
381  .decode_slice = vda_h264_decode_slice,
382  .end_frame = vda_h264_end_frame,
383 };
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