2 * VDA H264 HW acceleration.
4 * copyright (c) 2011 Sebastien Zwickert
6 * This file is part of FFmpeg.
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.
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.
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
23 #include <CoreFoundation/CFDictionary.h>
24 #include <CoreFoundation/CFNumber.h>
25 #include <CoreFoundation/CFData.h>
28 #include "libavutil/avutil.h"
32 #include <CoreFoundation/CFString.h>
34 /* Helper to create a dictionary according to the given pts. */
35 static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
37 CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
38 CFNumberRef value = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &i_pts);
39 CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
41 (const void **)&value,
43 &kCFTypeDictionaryKeyCallBacks,
44 &kCFTypeDictionaryValueCallBacks);
49 /* Helper to retrieve the pts from the given dictionary. */
50 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
58 pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
61 CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
66 /* Removes and releases all frames from the queue. */
67 static void vda_clear_queue(struct vda_context *vda_ctx)
71 pthread_mutex_lock(&vda_ctx->queue_mutex);
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);
79 pthread_mutex_unlock(&vda_ctx->queue_mutex);
82 static int vda_decoder_decode(struct vda_context *vda_ctx,
88 CFDictionaryRef user_info;
89 CFDataRef coded_frame;
91 coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
92 user_info = vda_dictionary_with_pts(frame_pts);
94 status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
97 CFRelease(coded_frame);
102 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
104 vda_frame *top_frame;
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);
117 void ff_vda_release_vda_frame(vda_frame *frame)
120 CVPixelBufferRelease(frame->cv_buffer);
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,
131 CVImageBufferRef image_buffer)
133 struct vda_context *vda_ctx = vda_hw_ctx;
138 if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
141 if (vda_ctx->use_sync_decoding) {
142 vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
144 vda_frame *new_frame;
145 vda_frame *queue_walker;
147 if (!(new_frame = av_mallocz(sizeof(*new_frame))))
150 new_frame->next_frame = NULL;
151 new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
152 new_frame->pts = vda_pts_from_dictionary(user_info);
154 pthread_mutex_lock(&vda_ctx->queue_mutex);
156 queue_walker = vda_ctx->queue;
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;
163 /* walk the queue and insert this frame where it belongs in display order */
164 vda_frame *next_frame;
167 next_frame = queue_walker->next_frame;
169 if (!next_frame || (new_frame->pts < next_frame->pts)) {
170 new_frame->next_frame = next_frame;
171 queue_walker->next_frame = new_frame;
174 queue_walker = next_frame;
178 pthread_mutex_unlock(&vda_ctx->queue_mutex);
182 static int vda_sync_decode(struct vda_context *vda_ctx)
185 CFDataRef coded_frame;
186 uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
188 coded_frame = CFDataCreate(kCFAllocatorDefault,
189 vda_ctx->priv_bitstream,
190 vda_ctx->priv_bitstream_size);
192 status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
194 if (kVDADecoderNoErr == status)
195 status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
197 CFRelease(coded_frame);
202 static int start_frame(AVCodecContext *avctx,
203 av_unused const uint8_t *buffer,
204 av_unused uint32_t size)
206 struct vda_context *vda_ctx = avctx->hwaccel_context;
208 if (!vda_ctx->decoder)
211 vda_ctx->priv_bitstream_size = 0;
216 static int decode_slice(AVCodecContext *avctx,
217 const uint8_t *buffer,
220 struct vda_context *vda_ctx = avctx->hwaccel_context;
223 if (!vda_ctx->decoder)
226 tmp = av_fast_realloc(vda_ctx->priv_bitstream,
227 &vda_ctx->priv_allocated_size,
228 vda_ctx->priv_bitstream_size + size + 4);
230 return AVERROR(ENOMEM);
232 vda_ctx->priv_bitstream = tmp;
234 AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
235 memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
237 vda_ctx->priv_bitstream_size += size + 4;
242 static int end_frame(AVCodecContext *avctx)
244 H264Context *h = avctx->priv_data;
245 struct vda_context *vda_ctx = avctx->hwaccel_context;
246 AVFrame *frame = &h->cur_pic_ptr->f;
249 if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
252 if (vda_ctx->use_sync_decoding) {
253 status = vda_sync_decode(vda_ctx);
254 frame->data[3] = (void*)vda_ctx->cv_buffer;
256 status = vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
257 vda_ctx->priv_bitstream_size,
258 frame->reordered_opaque);
262 av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
267 int ff_vda_create_decoder(struct vda_context *vda_ctx,
276 CFMutableDictionaryRef config_info;
277 CFMutableDictionaryRef buffer_attributes;
278 CFMutableDictionaryRef io_surface_properties;
279 CFNumberRef cv_pix_fmt;
281 vda_ctx->priv_bitstream = NULL;
282 vda_ctx->priv_allocated_size = 0;
285 pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
288 /* Each VCL NAL in the bitstream sent to the decoder
289 * is preceded by a 4 bytes length header.
290 * Change the avcC atom header if needed, to signal headers of 4 bytes. */
291 if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
292 uint8_t *rw_extradata;
294 if (!(rw_extradata = av_malloc(extradata_size)))
295 return AVERROR(ENOMEM);
297 memcpy(rw_extradata, extradata, extradata_size);
299 rw_extradata[4] |= 0x03;
301 avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
303 av_freep(&rw_extradata);
305 avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
308 config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
310 &kCFTypeDictionaryKeyCallBacks,
311 &kCFTypeDictionaryValueCallBacks);
313 height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
314 width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
315 format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
317 CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
318 CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
319 CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
320 CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
322 buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
324 &kCFTypeDictionaryKeyCallBacks,
325 &kCFTypeDictionaryValueCallBacks);
326 io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
328 &kCFTypeDictionaryKeyCallBacks,
329 &kCFTypeDictionaryValueCallBacks);
330 cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault,
332 &vda_ctx->cv_pix_fmt_type);
333 CFDictionarySetValue(buffer_attributes,
334 kCVPixelBufferPixelFormatTypeKey,
336 CFDictionarySetValue(buffer_attributes,
337 kCVPixelBufferIOSurfacePropertiesKey,
338 io_surface_properties);
340 status = VDADecoderCreate(config_info,
342 vda_decoder_callback,
350 CFRelease(config_info);
351 CFRelease(io_surface_properties);
352 CFRelease(cv_pix_fmt);
353 CFRelease(buffer_attributes);
358 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
360 OSStatus status = kVDADecoderNoErr;
362 if (vda_ctx->decoder)
363 status = VDADecoderDestroy(vda_ctx->decoder);
366 vda_clear_queue(vda_ctx);
367 pthread_mutex_destroy(&vda_ctx->queue_mutex);
369 av_freep(&vda_ctx->priv_bitstream);
374 AVHWAccel ff_h264_vda_hwaccel = {
376 .type = AVMEDIA_TYPE_VIDEO,
377 .id = AV_CODEC_ID_H264,
378 .pix_fmt = AV_PIX_FMT_VDA_VLD,
379 .start_frame = start_frame,
380 .decode_slice = decode_slice,
381 .end_frame = end_frame,