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libavcodec/vda.c

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00001 /*
00002  * VDA HW acceleration.
00003  *
00004  * copyright (c) 2011 Sebastien Zwickert
00005  *
00006  * This file is part of FFmpeg.
00007  *
00008  * FFmpeg is free software; you can redistribute it and/or
00009  * modify it under the terms of the GNU Lesser General Public
00010  * License as published by the Free Software Foundation; either
00011  * version 2.1 of the License, or (at your option) any later version.
00012  *
00013  * FFmpeg is distributed in the hope that it will be useful,
00014  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00015  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016  * Lesser General Public License for more details.
00017  *
00018  * You should have received a copy of the GNU Lesser General Public
00019  * License along with FFmpeg; if not, write to the Free Software
00020  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00021  */
00022 
00023 #include <pthread.h>
00024 #include <CoreFoundation/CFDictionary.h>
00025 #include <CoreFoundation/CFNumber.h>
00026 #include <CoreFoundation/CFData.h>
00027 #include <CoreFoundation/CFString.h>
00028 
00029 #include "libavutil/avutil.h"
00030 #include "vda_internal.h"
00031 
00032 /* Helper to create a dictionary according to the given pts. */
00033 static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
00034 {
00035     CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
00036     CFNumberRef value = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &i_pts);
00037     CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
00038                                                    (const void **)&key,
00039                                                    (const void **)&value,
00040                                                    1,
00041                                                    &kCFTypeDictionaryKeyCallBacks,
00042                                                    &kCFTypeDictionaryValueCallBacks);
00043     CFRelease(value);
00044     return user_info;
00045 }
00046 
00047 /* Helper to retrieve the pts from the given dictionary. */
00048 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
00049 {
00050     CFNumberRef pts;
00051     int64_t outValue = 0;
00052 
00053     if (!user_info)
00054         return 0;
00055 
00056     pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
00057 
00058     if (pts)
00059         CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
00060 
00061     return outValue;
00062 }
00063 
00064 /* Removes and releases all frames from the queue. */
00065 static void vda_clear_queue(struct vda_context *vda_ctx)
00066 {
00067     vda_frame *top_frame;
00068 
00069     pthread_mutex_lock(&vda_ctx->queue_mutex);
00070 
00071     while (vda_ctx->queue) {
00072         top_frame = vda_ctx->queue;
00073         vda_ctx->queue = top_frame->next_frame;
00074         ff_vda_release_vda_frame(top_frame);
00075     }
00076 
00077     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00078 }
00079 
00080 
00081 /* Decoder callback that adds the vda frame to the queue in display order. */
00082 static void vda_decoder_callback (void *vda_hw_ctx,
00083                                   CFDictionaryRef user_info,
00084                                   OSStatus status,
00085                                   uint32_t infoFlags,
00086                                   CVImageBufferRef image_buffer)
00087 {
00088     struct vda_context *vda_ctx = (struct vda_context*)vda_hw_ctx;
00089     vda_frame *new_frame;
00090     vda_frame *queue_walker;
00091 
00092     if (!image_buffer)
00093         return;
00094 
00095     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
00096         return;
00097 
00098     new_frame = av_mallocz(sizeof(vda_frame));
00099     if (!new_frame)
00100         return;
00101 
00102     new_frame->next_frame = NULL;
00103     new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
00104     new_frame->pts = vda_pts_from_dictionary(user_info);
00105 
00106     pthread_mutex_lock(&vda_ctx->queue_mutex);
00107 
00108     queue_walker = vda_ctx->queue;
00109 
00110     if (!queue_walker || (new_frame->pts < queue_walker->pts)) {
00111         /* we have an empty queue, or this frame earlier than the current queue head */
00112         new_frame->next_frame = queue_walker;
00113         vda_ctx->queue = new_frame;
00114     } else {
00115         /* walk the queue and insert this frame where it belongs in display order */
00116         vda_frame *next_frame;
00117 
00118         while (1) {
00119             next_frame = queue_walker->next_frame;
00120 
00121             if (!next_frame || (new_frame->pts < next_frame->pts)) {
00122                 new_frame->next_frame = next_frame;
00123                 queue_walker->next_frame = new_frame;
00124                 break;
00125             }
00126             queue_walker = next_frame;
00127         }
00128     }
00129 
00130     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00131 }
00132 
00133 int ff_vda_create_decoder(struct vda_context *vda_ctx,
00134                           uint8_t *extradata,
00135                           int extradata_size)
00136 {
00137     OSStatus status = kVDADecoderNoErr;
00138     CFNumberRef height;
00139     CFNumberRef width;
00140     CFNumberRef format;
00141     CFDataRef avc_data;
00142     CFMutableDictionaryRef config_info;
00143     CFMutableDictionaryRef buffer_attributes;
00144     CFMutableDictionaryRef io_surface_properties;
00145     CFNumberRef cv_pix_fmt;
00146 
00147     vda_ctx->bitstream = NULL;
00148     vda_ctx->ref_size = 0;
00149 
00150     pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
00151 
00152     if (extradata[4]==0xFE) {
00153         // convert 3 byte NAL sizes to 4 byte
00154         extradata[4] = 0xFF;
00155     }
00156 
00157     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
00158                                             4,
00159                                             &kCFTypeDictionaryKeyCallBacks,
00160                                             &kCFTypeDictionaryValueCallBacks);
00161 
00162     height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
00163     width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
00164     format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
00165     avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
00166 
00167     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
00168     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
00169     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
00170     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
00171 
00172     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
00173                                                   2,
00174                                                   &kCFTypeDictionaryKeyCallBacks,
00175                                                   &kCFTypeDictionaryValueCallBacks);
00176     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
00177                                                       0,
00178                                                       &kCFTypeDictionaryKeyCallBacks,
00179                                                       &kCFTypeDictionaryValueCallBacks);
00180     cv_pix_fmt  = CFNumberCreate(kCFAllocatorDefault,
00181                                  kCFNumberSInt32Type,
00182                                  &vda_ctx->cv_pix_fmt_type);
00183     CFDictionarySetValue(buffer_attributes,
00184                          kCVPixelBufferPixelFormatTypeKey,
00185                          cv_pix_fmt);
00186     CFDictionarySetValue(buffer_attributes,
00187                          kCVPixelBufferIOSurfacePropertiesKey,
00188                          io_surface_properties);
00189 
00190     status = VDADecoderCreate(config_info,
00191                               buffer_attributes,
00192                               (VDADecoderOutputCallback *)vda_decoder_callback,
00193                               vda_ctx,
00194                               &vda_ctx->decoder);
00195 
00196     CFRelease(height);
00197     CFRelease(width);
00198     CFRelease(format);
00199     CFRelease(avc_data);
00200     CFRelease(config_info);
00201     CFRelease(io_surface_properties);
00202     CFRelease(cv_pix_fmt);
00203     CFRelease(buffer_attributes);
00204 
00205     if (kVDADecoderNoErr != status)
00206         return status;
00207 
00208     return 0;
00209 }
00210 
00211 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
00212 {
00213     OSStatus status = kVDADecoderNoErr;
00214 
00215     if (vda_ctx->decoder)
00216         status = VDADecoderDestroy(vda_ctx->decoder);
00217 
00218     vda_clear_queue(vda_ctx);
00219 
00220     pthread_mutex_destroy(&vda_ctx->queue_mutex);
00221 
00222     if (vda_ctx->bitstream)
00223         av_freep(&vda_ctx->bitstream);
00224 
00225     if (kVDADecoderNoErr != status)
00226         return status;
00227 
00228     return 0;
00229 }
00230 
00231 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
00232 {
00233     vda_frame *top_frame;
00234 
00235     if (!vda_ctx->queue)
00236         return NULL;
00237 
00238     pthread_mutex_lock(&vda_ctx->queue_mutex);
00239     top_frame = vda_ctx->queue;
00240     vda_ctx->queue = top_frame->next_frame;
00241     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00242 
00243     return top_frame;
00244 }
00245 
00246 void ff_vda_release_vda_frame(vda_frame *frame)
00247 {
00248     if (frame) {
00249         CVPixelBufferRelease(frame->cv_buffer);
00250         av_freep(&frame);
00251     }
00252 }
00253 
00254 int ff_vda_decoder_decode(struct vda_context *vda_ctx,
00255                           uint8_t *bitstream,
00256                           int bitstream_size,
00257                           int64_t frame_pts)
00258 {
00259     OSStatus status = kVDADecoderNoErr;
00260     CFDictionaryRef user_info;
00261     CFDataRef coded_frame;
00262 
00263     coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
00264     user_info = vda_dictionary_with_pts(frame_pts);
00265 
00266     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
00267 
00268     CFRelease(user_info);
00269     CFRelease(coded_frame);
00270 
00271     if (kVDADecoderNoErr != status)
00272         return status;
00273 
00274     return 0;
00275 }
Generated on Fri Feb 1 2013 14:34:45 for FFmpeg by doxygen 1.7.1