2 * VDA H.264 hardware acceleration
4 * copyright (c) 2011 Sebastien Zwickert
6 * This file is part of Libav.
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.
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.
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
23 #include <CoreFoundation/CFNumber.h>
24 #include <CoreFoundation/CFData.h>
25 #include <CoreFoundation/CFString.h>
27 #include "libavutil/avutil.h"
32 #include <CoreFoundation/CFDictionary.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,
39 kCFNumberSInt64Type, &i_pts);
40 CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
42 (const void **)&value,
44 &kCFTypeDictionaryKeyCallBacks,
45 &kCFTypeDictionaryValueCallBacks);
50 /* helper to retrieve the pts from the given dictionary */
51 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
59 pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
62 CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
67 /* Remove and release all frames from the queue. */
68 static void vda_clear_queue(struct vda_context *vda_ctx)
72 pthread_mutex_lock(&vda_ctx->queue_mutex);
74 while (vda_ctx->queue) {
75 top_frame = vda_ctx->queue;
76 vda_ctx->queue = top_frame->next_frame;
77 ff_vda_release_vda_frame(top_frame);
80 pthread_mutex_unlock(&vda_ctx->queue_mutex);
83 static int vda_decoder_decode(struct vda_context *vda_ctx,
88 OSStatus status = kVDADecoderNoErr;
89 CFDictionaryRef user_info;
90 CFDataRef coded_frame;
92 coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
93 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))))
149 new_frame->next_frame = NULL;
150 new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
151 new_frame->pts = vda_pts_from_dictionary(user_info);
153 pthread_mutex_lock(&vda_ctx->queue_mutex);
155 queue_walker = vda_ctx->queue;
157 if (!queue_walker || new_frame->pts < queue_walker->pts) {
158 /* we have an empty queue, or this frame earlier than the current queue head */
159 new_frame->next_frame = queue_walker;
160 vda_ctx->queue = new_frame;
162 /* walk the queue and insert this frame where it belongs in display order */
163 vda_frame *next_frame;
165 next_frame = queue_walker->next_frame;
166 if (!next_frame || new_frame->pts < next_frame->pts) {
167 new_frame->next_frame = next_frame;
168 queue_walker->next_frame = new_frame;
171 queue_walker = next_frame;
175 pthread_mutex_unlock(&vda_ctx->queue_mutex);
179 static int vda_sync_decode(struct vda_context *vda_ctx)
182 CFDataRef coded_frame;
183 uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
185 coded_frame = CFDataCreate(kCFAllocatorDefault,
186 vda_ctx->priv_bitstream,
187 vda_ctx->priv_bitstream_size);
189 status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
191 if (kVDADecoderNoErr == status)
192 status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
194 CFRelease(coded_frame);
200 static int start_frame(AVCodecContext *avctx,
201 av_unused const uint8_t *buffer,
202 av_unused uint32_t size)
204 struct vda_context *vda_ctx = avctx->hwaccel_context;
206 if (!vda_ctx->decoder)
209 vda_ctx->priv_bitstream_size = 0;
214 static int decode_slice(AVCodecContext *avctx,
215 const uint8_t *buffer,
218 struct vda_context *vda_ctx = avctx->hwaccel_context;
221 if (!vda_ctx->decoder)
224 tmp = av_fast_realloc(vda_ctx->priv_bitstream,
225 &vda_ctx->priv_allocated_size,
226 vda_ctx->priv_bitstream_size + size + 4);
228 return AVERROR(ENOMEM);
230 vda_ctx->priv_bitstream = tmp;
232 AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
233 memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
235 vda_ctx->priv_bitstream_size += size + 4;
240 static int end_frame(AVCodecContext *avctx)
242 H264Context *h = avctx->priv_data;
243 struct vda_context *vda_ctx = avctx->hwaccel_context;
244 AVFrame *frame = &h->s.current_picture_ptr->f;
247 if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
250 if (vda_ctx->use_sync_decoding) {
251 status = vda_sync_decode(vda_ctx);
252 frame->data[3] = (void*)vda_ctx->cv_buffer;
254 status = vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
255 vda_ctx->priv_bitstream_size,
256 frame->reordered_opaque);
260 av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
265 int ff_vda_create_decoder(struct vda_context *vda_ctx,
269 OSStatus status = kVDADecoderNoErr;
274 CFMutableDictionaryRef config_info;
275 CFMutableDictionaryRef buffer_attributes;
276 CFMutableDictionaryRef io_surface_properties;
277 CFNumberRef cv_pix_fmt;
280 pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
283 /* Each VCL NAL in the bistream sent to the decoder
284 * is preceeded by a 4 bytes length header.
285 * Change the avcC atom header if needed, to signal headers of 4 bytes. */
286 if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
287 uint8_t *rw_extradata;
289 if (!(rw_extradata = av_malloc(extradata_size)))
290 return AVERROR(ENOMEM);
292 memcpy(rw_extradata, extradata, extradata_size);
294 rw_extradata[4] |= 0x03;
296 avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
298 av_freep(&rw_extradata);
300 avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
303 config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
305 &kCFTypeDictionaryKeyCallBacks,
306 &kCFTypeDictionaryValueCallBacks);
308 height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
309 width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
310 format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
312 CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
313 CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
314 CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
315 CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
317 buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
319 &kCFTypeDictionaryKeyCallBacks,
320 &kCFTypeDictionaryValueCallBacks);
321 io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
323 &kCFTypeDictionaryKeyCallBacks,
324 &kCFTypeDictionaryValueCallBacks);
325 cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault,
327 &vda_ctx->cv_pix_fmt_type);
328 CFDictionarySetValue(buffer_attributes,
329 kCVPixelBufferPixelFormatTypeKey,
331 CFDictionarySetValue(buffer_attributes,
332 kCVPixelBufferIOSurfacePropertiesKey,
333 io_surface_properties);
335 status = VDADecoderCreate(config_info,
337 vda_decoder_callback,
345 CFRelease(config_info);
346 CFRelease(io_surface_properties);
347 CFRelease(cv_pix_fmt);
348 CFRelease(buffer_attributes);
353 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
355 OSStatus status = kVDADecoderNoErr;
357 if (vda_ctx->decoder)
358 status = VDADecoderDestroy(vda_ctx->decoder);
361 vda_clear_queue(vda_ctx);
362 pthread_mutex_destroy(&vda_ctx->queue_mutex);
365 av_freep(&vda_ctx->priv_bitstream);
370 AVHWAccel ff_h264_vda_hwaccel = {
372 .type = AVMEDIA_TYPE_VIDEO,
373 .id = AV_CODEC_ID_H264,
374 .pix_fmt = AV_PIX_FMT_VDA_VLD,
375 .start_frame = start_frame,
376 .decode_slice = decode_slice,
377 .end_frame = end_frame,