git.sesse.net Git - ffmpeg/blob - libavcodec/vda_h264.c

   1 /*
   2  * VDA H.264 hardware acceleration
   3  *
   4  * copyright (c) 2011 Sebastien Zwickert
   5  *
   6  * This file is part of Libav.
   7  *
   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.
  12  *
  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.
  17  *
  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
  21  */
  22
  23 #include <CoreFoundation/CFNumber.h>
  24 #include <CoreFoundation/CFData.h>
  25 #include <CoreFoundation/CFString.h>
  26
  27 #include "libavutil/avutil.h"
  28 #include "h264.h"
  29 #include "vda.h"
  30
  31 /* Decoder callback that adds the VDA frame to the queue in display order. */
  32 static void vda_decoder_callback(void *vda_hw_ctx,
  33                                  CFDictionaryRef user_info,
  34                                  OSStatus status,
  35                                  uint32_t infoFlags,
  36                                  CVImageBufferRef image_buffer)
  37 {
  38     struct vda_context *vda_ctx = vda_hw_ctx;
  39
  40     if (!image_buffer)
  41         return;
  42
  43     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
  44         return;
  45
  46     if (vda_ctx->use_sync_decoding) {
  47         vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
  48     } else {
  49         vda_frame *new_frame;
  50         vda_frame *queue_walker;
  51
  52         if (!(new_frame = av_mallocz(sizeof(*new_frame))))
  53             return;
  54         new_frame->next_frame = NULL;
  55         new_frame->cv_buffer  = CVPixelBufferRetain(image_buffer);
  56         new_frame->pts        = vda_pts_from_dictionary(user_info);
  57
  58         pthread_mutex_lock(&vda_ctx->queue_mutex);
  59
  60         queue_walker = vda_ctx->queue;
  61
  62         if (!queue_walker || new_frame->pts < queue_walker->pts) {
  63             /* we have an empty queue, or this frame earlier than the current queue head */
  64             new_frame->next_frame = queue_walker;
  65             vda_ctx->queue        = new_frame;
  66         } else {
  67             /* walk the queue and insert this frame where it belongs in display order */
  68             vda_frame *next_frame;
  69             while (1) {
  70                 next_frame = queue_walker->next_frame;
  71                 if (!next_frame || new_frame->pts < next_frame->pts) {
  72                     new_frame->next_frame    = next_frame;
  73                     queue_walker->next_frame = new_frame;
  74                     break;
  75                 }
  76                 queue_walker = next_frame;
  77             }
  78         }
  79
  80         pthread_mutex_unlock(&vda_ctx->queue_mutex);
  81     }
  82 }
  83
  84 static int vda_sync_decode(struct vda_context *vda_ctx)
  85 {
  86     OSStatus status;
  87     CFDataRef coded_frame;
  88     uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
  89
  90     coded_frame = CFDataCreate(kCFAllocatorDefault,
  91                                vda_ctx->priv_bitstream,
  92                                vda_ctx->priv_bitstream_size);
  93
  94     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
  95
  96     if (kVDADecoderNoErr == status)
  97         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
  98
  99     CFRelease(coded_frame);
 100
 101     return status;
 102 }
 103
 104
 105 static int vda_h264_start_frame(AVCodecContext *avctx,
 106                                 av_unused const uint8_t *buffer,
 107                                 av_unused uint32_t size)
 108 {
 109     struct vda_context *vda_ctx         = avctx->hwaccel_context;
 110
 111     if (!vda_ctx->decoder)
 112         return -1;
 113
 114     vda_ctx->priv_bitstream_size = 0;
 115
 116     return 0;
 117 }
 118
 119 static int vda_h264_decode_slice(AVCodecContext *avctx,
 120                                  const uint8_t *buffer,
 121                                  uint32_t size)
 122 {
 123     struct vda_context *vda_ctx         = avctx->hwaccel_context;
 124     void *tmp;
 125
 126     if (!vda_ctx->decoder)
 127         return -1;
 128
 129     tmp = av_fast_realloc(vda_ctx->priv_bitstream,
 130                           &vda_ctx->priv_allocated_size,
 131                           vda_ctx->priv_bitstream_size + size + 4);
 132     if (!tmp)
 133         return AVERROR(ENOMEM);
 134
 135     vda_ctx->priv_bitstream = tmp;
 136
 137     AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
 138     memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
 139
 140     vda_ctx->priv_bitstream_size += size + 4;
 141
 142     return 0;
 143 }
 144
 145 static int vda_h264_end_frame(AVCodecContext *avctx)
 146 {
 147     H264Context *h                      = avctx->priv_data;
 148     struct vda_context *vda_ctx         = avctx->hwaccel_context;
 149     AVFrame *frame                      = &h->cur_pic_ptr->f;
 150     int status;
 151
 152     if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
 153         return -1;
 154
 155     if (vda_ctx->use_sync_decoding) {
 156         status = vda_sync_decode(vda_ctx);
 157         frame->data[3] = (void*)vda_ctx->cv_buffer;
 158     } else {
 159         status = vda_decoder_decode(vda_ctx, vda_ctx->priv_bitstream,
 160                                     vda_ctx->priv_bitstream_size,
 161                                     frame->reordered_opaque);
 162     }
 163
 164     if (status)
 165         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 166
 167     return status;
 168 }
 169
 170 int ff_vda_create_decoder(struct vda_context *vda_ctx,
 171                           uint8_t *extradata,
 172                           int extradata_size)
 173 {
 174     OSStatus status = kVDADecoderNoErr;
 175     CFNumberRef height;
 176     CFNumberRef width;
 177     CFNumberRef format;
 178     CFDataRef avc_data;
 179     CFMutableDictionaryRef config_info;
 180     CFMutableDictionaryRef buffer_attributes;
 181     CFMutableDictionaryRef io_surface_properties;
 182     CFNumberRef cv_pix_fmt;
 183
 184     /* Each VCL NAL in the bistream sent to the decoder
 185      * is preceded by a 4 bytes length header.
 186      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
 187     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
 188         uint8_t *rw_extradata;
 189
 190         if (!(rw_extradata = av_malloc(extradata_size)))
 191             return AVERROR(ENOMEM);
 192
 193         memcpy(rw_extradata, extradata, extradata_size);
 194
 195         rw_extradata[4] |= 0x03;
 196
 197         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
 198
 199         av_freep(&rw_extradata);
 200     } else {
 201         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
 202     }
 203
 204     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 205                                             4,
 206                                             &kCFTypeDictionaryKeyCallBacks,
 207                                             &kCFTypeDictionaryValueCallBacks);
 208
 209     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
 210     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
 211     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
 212
 213     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
 214     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
 215     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
 216     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
 217
 218     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 219                                                   2,
 220                                                   &kCFTypeDictionaryKeyCallBacks,
 221                                                   &kCFTypeDictionaryValueCallBacks);
 222     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 223                                                       0,
 224                                                       &kCFTypeDictionaryKeyCallBacks,
 225                                                       &kCFTypeDictionaryValueCallBacks);
 226     cv_pix_fmt      = CFNumberCreate(kCFAllocatorDefault,
 227                                      kCFNumberSInt32Type,
 228                                      &vda_ctx->cv_pix_fmt_type);
 229     CFDictionarySetValue(buffer_attributes,
 230                          kCVPixelBufferPixelFormatTypeKey,
 231                          cv_pix_fmt);
 232     CFDictionarySetValue(buffer_attributes,
 233                          kCVPixelBufferIOSurfacePropertiesKey,
 234                          io_surface_properties);
 235
 236     status = VDADecoderCreate(config_info,
 237                               buffer_attributes,
 238                               vda_decoder_callback,
 239                               vda_ctx,
 240                               &vda_ctx->decoder);
 241
 242     CFRelease(height);
 243     CFRelease(width);
 244     CFRelease(format);
 245     CFRelease(avc_data);
 246     CFRelease(config_info);
 247     CFRelease(io_surface_properties);
 248     CFRelease(cv_pix_fmt);
 249     CFRelease(buffer_attributes);
 250
 251     return status;
 252 }
 253
 254 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
 255 {
 256     OSStatus status = kVDADecoderNoErr;
 257
 258     if (vda_ctx->decoder)
 259         status = VDADecoderDestroy(vda_ctx->decoder);
 260
 261     av_freep(&vda_ctx->priv_bitstream);
 262
 263     return status;
 264 }
 265
 266 AVHWAccel ff_h264_vda_hwaccel = {
 267     .name           = "h264_vda",
 268     .type           = AVMEDIA_TYPE_VIDEO,
 269     .id             = AV_CODEC_ID_H264,
 270     .pix_fmt        = AV_PIX_FMT_VDA_VLD,
 271     .start_frame    = vda_h264_start_frame,
 272     .decode_slice   = vda_h264_decode_slice,
 273     .end_frame      = vda_h264_end_frame,
 274 };