FFmpeg: libavcodec/vda_h264.c Source File

00001 /*
00002  * VDA H264 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 <CoreFoundation/CFDictionary.h>
00024 #include <CoreFoundation/CFNumber.h>
00025 #include <CoreFoundation/CFData.h>
00026 
00027 #include "vda.h"
00028 #include "libavutil/avutil.h"
00029 #include "h264.h"
00030 
00031 #if FF_API_VDA_ASYNC
00032 #include <CoreFoundation/CFString.h>
00033 
00034 /* Helper to create a dictionary according to the given pts. */
00035 static CFDictionaryRef vda_dictionary_with_pts(int64_t i_pts)
00036 {
00037     CFStringRef key = CFSTR("FF_VDA_DECODER_PTS_KEY");
00038     CFNumberRef value = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt64Type, &i_pts);
00039     CFDictionaryRef user_info = CFDictionaryCreate(kCFAllocatorDefault,
00040                                                    (const void **)&key,
00041                                                    (const void **)&value,
00042                                                    1,
00043                                                    &kCFTypeDictionaryKeyCallBacks,
00044                                                    &kCFTypeDictionaryValueCallBacks);
00045     CFRelease(value);
00046     return user_info;
00047 }
00048 
00049 /* Helper to retrieve the pts from the given dictionary. */
00050 static int64_t vda_pts_from_dictionary(CFDictionaryRef user_info)
00051 {
00052     CFNumberRef pts;
00053     int64_t outValue = 0;
00054 
00055     if (!user_info)
00056         return 0;
00057 
00058     pts = CFDictionaryGetValue(user_info, CFSTR("FF_VDA_DECODER_PTS_KEY"));
00059 
00060     if (pts)
00061         CFNumberGetValue(pts, kCFNumberSInt64Type, &outValue);
00062 
00063     return outValue;
00064 }
00065 
00066 /* Removes and releases all frames from the queue. */
00067 static void vda_clear_queue(struct vda_context *vda_ctx)
00068 {
00069     vda_frame *top_frame;
00070 
00071     pthread_mutex_lock(&vda_ctx->queue_mutex);
00072 
00073     while (vda_ctx->queue) {
00074         top_frame = vda_ctx->queue;
00075         vda_ctx->queue = top_frame->next_frame;
00076         ff_vda_release_vda_frame(top_frame);
00077     }
00078 
00079     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00080 }
00081 
00082 static int vda_decoder_decode(struct vda_context *vda_ctx,
00083                               uint8_t *bitstream,
00084                               int bitstream_size,
00085                               int64_t frame_pts)
00086 {
00087     OSStatus status;
00088     CFDictionaryRef user_info;
00089     CFDataRef coded_frame;
00090 
00091     coded_frame = CFDataCreate(kCFAllocatorDefault, bitstream, bitstream_size);
00092     user_info = vda_dictionary_with_pts(frame_pts);
00093 
00094     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, user_info);
00095 
00096     CFRelease(user_info);
00097     CFRelease(coded_frame);
00098 
00099     return status;
00100 }
00101 
00102 vda_frame *ff_vda_queue_pop(struct vda_context *vda_ctx)
00103 {
00104     vda_frame *top_frame;
00105 
00106     if (!vda_ctx->queue)
00107         return NULL;
00108 
00109     pthread_mutex_lock(&vda_ctx->queue_mutex);
00110     top_frame = vda_ctx->queue;
00111     vda_ctx->queue = top_frame->next_frame;
00112     pthread_mutex_unlock(&vda_ctx->queue_mutex);
00113 
00114     return top_frame;
00115 }
00116 
00117 void ff_vda_release_vda_frame(vda_frame *frame)
00118 {
00119     if (frame) {
00120         CVPixelBufferRelease(frame->cv_buffer);
00121         av_freep(&frame);
00122     }
00123 }
00124 #endif
00125 
00126 /* Decoder callback that adds the vda frame to the queue in display order. */
00127 static void vda_decoder_callback (void *vda_hw_ctx,
00128                                   CFDictionaryRef user_info,
00129                                   OSStatus status,
00130                                   uint32_t infoFlags,
00131                                   CVImageBufferRef image_buffer)
00132 {
00133     struct vda_context *vda_ctx = vda_hw_ctx;
00134 
00135     if (!image_buffer)
00136         return;
00137 
00138     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
00139         return;
00140 
00141     if (vda_ctx->use_sync_decoding) {
00142         vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
00143     } else {
00144         vda_frame *new_frame;
00145         vda_frame *queue_walker;
00146 
00147         if (!(new_frame = av_mallocz(sizeof(*new_frame))))
00148             return;
00149 
00150         new_frame->next_frame = NULL;
00151         new_frame->cv_buffer = CVPixelBufferRetain(image_buffer);
00152         new_frame->pts = vda_pts_from_dictionary(user_info);
00153 
00154         pthread_mutex_lock(&vda_ctx->queue_mutex);
00155 
00156         queue_walker = vda_ctx->queue;
00157 
00158         if (!queue_walker || (new_frame->pts < queue_walker->pts)) {
00159             /* we have an empty queue, or this frame earlier than the current queue head */
00160             new_frame->next_frame = queue_walker;
00161             vda_ctx->queue = new_frame;
00162         } else {
00163             /* walk the queue and insert this frame where it belongs in display order */
00164             vda_frame *next_frame;
00165 
00166             while (1) {
00167                 next_frame = queue_walker->next_frame;
00168 
00169                 if (!next_frame || (new_frame->pts < next_frame->pts)) {
00170                     new_frame->next_frame = next_frame;
00171                     queue_walker->next_frame = new_frame;
00172                     break;
00173                 }
00174                 queue_walker = next_frame;
00175             }
00176         }
00177 
00178         pthread_mutex_unlock(&vda_ctx->queue_mutex);
00179     }
00180 }
00181 
00182 static int vda_sync_decode(struct vda_context *vda_ctx)
00183 {
00184     OSStatus status;
00185     CFDataRef coded_frame;
00186     uint32_t flush_flags = 1 << 0; 
00187 
00188     coded_frame = CFDataCreate(kCFAllocatorDefault,
00189                                vda_ctx->priv_bitstream,
00190                                vda_ctx->priv_bitstream_size);
00191 
00192     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
00193 
00194     if (kVDADecoderNoErr == status)
00195         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
00196 
00197     CFRelease(coded_frame);
00198 
00199     return status;
00200 }
00201 
00202 static int start_frame(AVCodecContext *avctx,
00203                        av_unused const uint8_t *buffer,
00204                        av_unused uint32_t size)
00205 {
00206     struct vda_context *vda_ctx = avctx->hwaccel_context;
00207 
00208     if (!vda_ctx->decoder)
00209         return -1;
00210 
00211     vda_ctx->priv_bitstream_size = 0;
00212 
00213     return 0;
00214 }
00215 
00216 static int decode_slice(AVCodecContext *avctx,
00217                         const uint8_t *buffer,
00218                         uint32_t size)
00219 {
00220     struct vda_context *vda_ctx = avctx->hwaccel_context;
00221     void *tmp;
00222 
00223     if (!vda_ctx->decoder)
00224         return -1;
00225 
00226     tmp = av_fast_realloc(vda_ctx->priv_bitstream,
00227                           &vda_ctx->priv_allocated_size,
00228                           vda_ctx->priv_bitstream_size + size + 4);
00229     if (!tmp)
00230         return AVERROR(ENOMEM);
00231 
00232     vda_ctx->priv_bitstream = tmp;
00233 
00234     AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
00235     memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
00236 
00237     vda_ctx->priv_bitstream_size += size + 4;
00238 
00239     return 0;
00240 }
00241 
00242 static int end_frame(AVCodecContext *avctx)
00243 {
00244     H264Context *h                      = avctx->priv_data;
00245     struct vda_context *vda_ctx         = avctx->hwaccel_context;
00246     AVFrame *frame                      = &h->s.current_picture_ptr->f;
00247     int status;
00248 
00249     if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
00250         return -1;
00251 
00252     if (vda_ctx->use_sync_decoding) {
00253         status = vda_sync_decode(vda_ctx);
00254         frame->data[3] = (void*)vda_ctx->cv_buffer;
00255     } else {
00256         status = vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
00257                                     vda_ctx->priv_bitstream_size,
00258                                     frame->reordered_opaque);
00259     }
00260 
00261     if (status)
00262         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
00263 
00264     return status;
00265 }
00266 
00267 int ff_vda_create_decoder(struct vda_context *vda_ctx,
00268                           uint8_t *extradata,
00269                           int extradata_size)
00270 {
00271     OSStatus status;
00272     CFNumberRef height;
00273     CFNumberRef width;
00274     CFNumberRef format;
00275     CFDataRef avc_data;
00276     CFMutableDictionaryRef config_info;
00277     CFMutableDictionaryRef buffer_attributes;
00278     CFMutableDictionaryRef io_surface_properties;
00279     CFNumberRef cv_pix_fmt;
00280 
00281     vda_ctx->priv_bitstream = NULL;
00282     vda_ctx->priv_allocated_size = 0;
00283 
00284 #if FF_API_VDA_ASYNC
00285     pthread_mutex_init(&vda_ctx->queue_mutex, NULL);
00286 #endif
00287 
00288     /* Each VCL NAL in the bistream sent to the decoder
00289      * is preceded by a 4 bytes length header.
00290      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
00291     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
00292         uint8_t *rw_extradata;
00293 
00294         if (!(rw_extradata = av_malloc(extradata_size)))
00295             return AVERROR(ENOMEM);
00296 
00297         memcpy(rw_extradata, extradata, extradata_size);
00298 
00299         rw_extradata[4] |= 0x03;
00300 
00301         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
00302 
00303         av_freep(&rw_extradata);
00304     } else {
00305         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
00306     }
00307 
00308     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
00309                                             4,
00310                                             &kCFTypeDictionaryKeyCallBacks,
00311                                             &kCFTypeDictionaryValueCallBacks);
00312 
00313     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
00314     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
00315     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
00316 
00317     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
00318     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
00319     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
00320     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
00321 
00322     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
00323                                                   2,
00324                                                   &kCFTypeDictionaryKeyCallBacks,
00325                                                   &kCFTypeDictionaryValueCallBacks);
00326     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
00327                                                       0,
00328                                                       &kCFTypeDictionaryKeyCallBacks,
00329                                                       &kCFTypeDictionaryValueCallBacks);
00330     cv_pix_fmt  = CFNumberCreate(kCFAllocatorDefault,
00331                                  kCFNumberSInt32Type,
00332                                  &vda_ctx->cv_pix_fmt_type);
00333     CFDictionarySetValue(buffer_attributes,
00334                          kCVPixelBufferPixelFormatTypeKey,
00335                          cv_pix_fmt);
00336     CFDictionarySetValue(buffer_attributes,
00337                          kCVPixelBufferIOSurfacePropertiesKey,
00338                          io_surface_properties);
00339 
00340     status = VDADecoderCreate(config_info,
00341                               buffer_attributes,
00342                               vda_decoder_callback,
00343                               vda_ctx,
00344                               &vda_ctx->decoder);
00345 
00346     CFRelease(height);
00347     CFRelease(width);
00348     CFRelease(format);
00349     CFRelease(avc_data);
00350     CFRelease(config_info);
00351     CFRelease(io_surface_properties);
00352     CFRelease(cv_pix_fmt);
00353     CFRelease(buffer_attributes);
00354 
00355     return status;
00356 }
00357 
00358 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
00359 {
00360     OSStatus status = kVDADecoderNoErr;
00361 
00362     if (vda_ctx->decoder)
00363         status = VDADecoderDestroy(vda_ctx->decoder);
00364 
00365 #if FF_API_VDA_ASYNC
00366     vda_clear_queue(vda_ctx);
00367     pthread_mutex_destroy(&vda_ctx->queue_mutex);
00368 #endif
00369     av_freep(&vda_ctx->priv_bitstream);
00370 
00371     return status;
00372 }
00373 
00374 AVHWAccel ff_h264_vda_hwaccel = {
00375     .name           = "h264_vda",
00376     .type           = AVMEDIA_TYPE_VIDEO,
00377     .id             = AV_CODEC_ID_H264,
00378     .pix_fmt        = PIX_FMT_VDA_VLD,
00379     .start_frame    = start_frame,
00380     .decode_slice   = decode_slice,
00381     .end_frame      = end_frame,
00382 };