libavcodec/vda.c
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00001 /*
00002  * VDA hardware acceleration
00003  *
00004  * copyright (c) 2011 Sebastien Zwickert
00005  *
00006  * This file is part of Libav.
00007  *
00008  * Libav 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  * Libav 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 Libav; 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,
00037                                                kCFNumberSInt64Type, &i_pts);
00038     CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
00039                                                    (const void **)&key,
00040                                                    (const void **)&value,
00041                                                    1,
00042                                                    &kCFTypeDictionaryKeyCallBacks,
00043                                                    &kCFTypeDictionaryValueCallBacks);
00044     CFRelease(value);
00045     return user_info;
00046 }
00047 
00048 /* helper to retrieve the pts from the given dictionary */
00049 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
00050 {
00051     CFNumberRef pts;
00052     int64_t outValue = 0;
00053 
00054     if (!user_info)
00055         return 0;
00056 
00057     pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
00058 
00059     if (pts)
00060         CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
00061 
00062     return outValue;
00063 }
00064 
00065 /* Remove and release all frames from the queue. */
00066 static void vda_clear_queue(struct vda_context *vda_ctx)
00067 {
00068     vda_frame *top_frame;
00069 
00070     pthread_mutex_lock(&vda_ctx->queue_mutex);
00071 
00072     while (vda_ctx->queue) {
00073         top_frame      = vda_ctx->queue;
00074         vda_ctx->queue = top_frame->next_frame;
00075         ff_vda_release_vda_frame(top_frame);
00076     }
00077 
00078     pthread_mutex_unlock(&vda_ctx->queue_mutex);
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 = 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     if (!(new_frame = av_mallocz(sizeof(vda_frame))))
00099         return;
00100     new_frame->next_frame = NULL;
00101     new_frame->cv_buffer  = CVPixelBufferRetain(image_buffer);
00102     new_frame->pts        = vda_pts_from_dictionary(user_info);
00103 
00104     pthread_mutex_lock(&vda_ctx->queue_mutex);
00105 
00106     queue_walker = vda_ctx->queue;
00107 
00108     if (!queue_walker || new_frame->pts < queue_walker->pts) {
00109         /* we have an empty queue, or this frame earlier than the current queue head */
00110         new_frame->next_frame = queue_walker;
00111         vda_ctx->queue        = new_frame;
00112     } else {
00113         /* walk the queue and insert this frame where it belongs in display order */
00114         vda_frame *next_frame;
00115         while (1) {
00116             next_frame = queue_walker->next_frame;
00117             if (!next_frame || new_frame->pts < next_frame->pts) {
00118                 new_frame->next_frame    = next_frame;
00119                 queue_walker->next_frame = new_frame;
00120                 break;
00121             }
00122             queue_walker = next_frame;
00123         }
00124     }
00125 
00126     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00127 }
00128 
00129 int ff_vda_create_decoder(struct vda_context *vda_ctx,
00130                           uint8_t *extradata,
00131                           int extradata_size)
00132 {
00133     OSStatus status = kVDADecoderNoErr;
00134     CFNumberRef height;
00135     CFNumberRef width;
00136     CFNumberRef format;
00137     CFDataRef avc_data;
00138     CFMutableDictionaryRef config_info;
00139     CFMutableDictionaryRef buffer_attributes;
00140     CFMutableDictionaryRef io_surface_properties;
00141     CFNumberRef cv_pix_fmt;
00142 
00143     pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
00144 
00145     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
00146                                             4,
00147                                             &kCFTypeDictionaryKeyCallBacks,
00148                                             &kCFTypeDictionaryValueCallBacks);
00149 
00150     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
00151     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
00152     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
00153     avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
00154 
00155     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
00156     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
00157     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
00158     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
00159 
00160     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
00161                                                   2,
00162                                                   &kCFTypeDictionaryKeyCallBacks,
00163                                                   &kCFTypeDictionaryValueCallBacks);
00164     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
00165                                                       0,
00166                                                       &kCFTypeDictionaryKeyCallBacks,
00167                                                       &kCFTypeDictionaryValueCallBacks);
00168     cv_pix_fmt      = CFNumberCreate(kCFAllocatorDefault,
00169                                      kCFNumberSInt32Type,
00170                                      &vda_ctx->cv_pix_fmt_type);
00171     CFDictionarySetValue(buffer_attributes,
00172                          kCVPixelBufferPixelFormatTypeKey,
00173                          cv_pix_fmt);
00174     CFDictionarySetValue(buffer_attributes,
00175                          kCVPixelBufferIOSurfacePropertiesKey,
00176                          io_surface_properties);
00177 
00178     status = VDADecoderCreate(config_info,
00179                               buffer_attributes,
00180                               vda_decoder_callback,
00181                               vda_ctx,
00182                               &vda_ctx->decoder);
00183 
00184     CFRelease(height);
00185     CFRelease(width);
00186     CFRelease(format);
00187     CFRelease(avc_data);
00188     CFRelease(config_info);
00189     CFRelease(io_surface_properties);
00190     CFRelease(cv_pix_fmt);
00191     CFRelease(buffer_attributes);
00192 
00193     if (kVDADecoderNoErr != status)
00194         return status;
00195 
00196     return 0;
00197 }
00198 
00199 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
00200 {
00201     OSStatus status = kVDADecoderNoErr;
00202 
00203     if (vda_ctx->decoder)
00204         status = VDADecoderDestroy(vda_ctx->decoder);
00205 
00206     vda_clear_queue(vda_ctx);
00207 
00208     pthread_mutex_destroy(&vda_ctx->queue_mutex);
00209 
00210     if (kVDADecoderNoErr != status)
00211         return status;
00212 
00213     return 0;
00214 }
00215 
00216 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
00217 {
00218     vda_frame *top_frame;
00219 
00220     if (!vda_ctx->queue)
00221         return NULL;
00222 
00223     pthread_mutex_lock(&vda_ctx->queue_mutex);
00224     top_frame      = vda_ctx->queue;
00225     vda_ctx->queue = top_frame->next_frame;
00226     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00227 
00228     return top_frame;
00229 }
00230 
00231 void ff_vda_release_vda_frame(vda_frame *frame)
00232 {
00233     if (frame) {
00234         CVPixelBufferRelease(frame->cv_buffer);
00235         av_freep(&frame);
00236     }
00237 }
00238 
00239 int ff_vda_decoder_decode(struct vda_context *vda_ctx,
00240                           uint8_t *bitstream,
00241                           int bitstream_size,
00242                           int64_t frame_pts)
00243 {
00244     OSStatus status = kVDADecoderNoErr;
00245     CFDictionaryRef user_info;
00246     CFDataRef coded_frame;
00247 
00248     coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
00249     user_info   = vda_dictionary_with_pts(frame_pts);
00250     status      = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
00251 
00252     CFRelease(user_info);
00253     CFRelease(coded_frame);
00254 
00255     if (kVDADecoderNoErr != status)
00256         return status;
00257 
00258     return 0;
00259 }