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

   1 /*
   2  * VDA H264 HW acceleration.
   3  *
   4  * copyright (c) 2011 Sebastien Zwickert
   5  *
   6  * This file is part of FFmpeg.
   7  *
   8  * FFmpeg 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  * FFmpeg 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 FFmpeg; 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/CFDictionary.h>
  24 #include <CoreFoundation/CFNumber.h>
  25 #include <CoreFoundation/CFData.h>
  26
  27 #include "vda.h"
  28 #include "libavutil/avutil.h"
  29 #include "h264.h"
  30
  31 struct vda_buffer {
  32     CVPixelBufferRef cv_buffer;
  33 };
  34
  35 /* Decoder callback that adds the vda frame to the queue in display order. */
  36 static void vda_decoder_callback(void *vda_hw_ctx,
  37                                  CFDictionaryRef user_info,
  38                                  OSStatus status,
  39                                  uint32_t infoFlags,
  40                                  CVImageBufferRef image_buffer)
  41 {
  42     struct vda_context *vda_ctx = vda_hw_ctx;
  43
  44     if (infoFlags & kVDADecodeInfo_FrameDropped)
  45         vda_ctx->cv_buffer = NULL;
  46
  47     if (!image_buffer)
  48         return;
  49
  50     if (vda_ctx->cv_pix_fmt_type != CVPixelBufferGetPixelFormatType(image_buffer))
  51         return;
  52
  53     vda_ctx->cv_buffer = CVPixelBufferRetain(image_buffer);
  54 }
  55
  56 static int vda_sync_decode(struct vda_context *vda_ctx)
  57 {
  58     OSStatus status;
  59     CFDataRef coded_frame;
  60     uint32_t flush_flags = 1 << 0; ///< kVDADecoderFlush_emitFrames
  61
  62     coded_frame = CFDataCreate(kCFAllocatorDefault,
  63                                vda_ctx->priv_bitstream,
  64                                vda_ctx->priv_bitstream_size);
  65
  66     status = VDADecoderDecode(vda_ctx->decoder, 0, coded_frame, NULL);
  67
  68     if (kVDADecoderNoErr == status)
  69         status = VDADecoderFlush(vda_ctx->decoder, flush_flags);
  70
  71     CFRelease(coded_frame);
  72
  73     return status;
  74 }
  75
  76
  77 static int vda_h264_start_frame(AVCodecContext *avctx,
  78                                 av_unused const uint8_t *buffer,
  79                                 av_unused uint32_t size)
  80 {
  81     struct vda_context *vda_ctx = avctx->hwaccel_context;
  82
  83     if (!vda_ctx->decoder)
  84         return -1;
  85
  86     vda_ctx->priv_bitstream_size = 0;
  87
  88     return 0;
  89 }
  90
  91 static int vda_h264_decode_slice(AVCodecContext *avctx,
  92                                  const uint8_t *buffer,
  93                                  uint32_t size)
  94 {
  95     struct vda_context *vda_ctx = avctx->hwaccel_context;
  96     void *tmp;
  97
  98     if (!vda_ctx->decoder)
  99         return -1;
 100
 101     tmp = av_fast_realloc(vda_ctx->priv_bitstream,
 102                           &vda_ctx->priv_allocated_size,
 103                           vda_ctx->priv_bitstream_size + size + 4);
 104     if (!tmp)
 105         return AVERROR(ENOMEM);
 106
 107     vda_ctx->priv_bitstream = tmp;
 108
 109     AV_WB32(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size, size);
 110     memcpy(vda_ctx->priv_bitstream + vda_ctx->priv_bitstream_size + 4, buffer, size);
 111
 112     vda_ctx->priv_bitstream_size += size + 4;
 113
 114     return 0;
 115 }
 116
 117 static void vda_h264_release_buffer(void *opaque, uint8_t *data)
 118 {
 119     struct vda_buffer *context = opaque;
 120     CVPixelBufferRelease(context->cv_buffer);
 121     av_free(context);
 122 }
 123
 124 static int vda_h264_end_frame(AVCodecContext *avctx)
 125 {
 126     H264Context *h                      = avctx->priv_data;
 127     struct vda_context *vda_ctx         = avctx->hwaccel_context;
 128     AVFrame *frame                      = &h->cur_pic_ptr->f;
 129     struct vda_buffer *context;
 130     AVBufferRef *buffer;
 131     int status;
 132
 133     if (!vda_ctx->decoder || !vda_ctx->priv_bitstream)
 134         return -1;
 135
 136     status = vda_sync_decode(vda_ctx);
 137     frame->data[3] = (void*)vda_ctx->cv_buffer;
 138
 139     if (status)
 140         av_log(avctx, AV_LOG_ERROR, "Failed to decode frame (%d)\n", status);
 141
 142     if (!vda_ctx->use_ref_buffer || status)
 143         return status;
 144
 145     context = av_mallocz(sizeof(*context));
 146     buffer = av_buffer_create(NULL, 0, vda_h264_release_buffer, context, 0);
 147     if (!context || !buffer) {
 148         CVPixelBufferRelease(vda_ctx->cv_buffer);
 149         av_free(context);
 150         return -1;
 151     }
 152
 153     context->cv_buffer = vda_ctx->cv_buffer;
 154     frame->buf[3] = buffer;
 155
 156     return status;
 157 }
 158
 159 int ff_vda_create_decoder(struct vda_context *vda_ctx,
 160                           uint8_t *extradata,
 161                           int extradata_size)
 162 {
 163     OSStatus status;
 164     CFNumberRef height;
 165     CFNumberRef width;
 166     CFNumberRef format;
 167     CFDataRef avc_data;
 168     CFMutableDictionaryRef config_info;
 169     CFMutableDictionaryRef buffer_attributes;
 170     CFMutableDictionaryRef io_surface_properties;
 171     CFNumberRef cv_pix_fmt;
 172
 173     vda_ctx->priv_bitstream = NULL;
 174     vda_ctx->priv_allocated_size = 0;
 175
 176     /* Each VCL NAL in the bitstream sent to the decoder
 177      * is preceded by a 4 bytes length header.
 178      * Change the avcC atom header if needed, to signal headers of 4 bytes. */
 179     if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) {
 180         uint8_t *rw_extradata;
 181
 182         if (!(rw_extradata = av_malloc(extradata_size)))
 183             return AVERROR(ENOMEM);
 184
 185         memcpy(rw_extradata, extradata, extradata_size);
 186
 187         rw_extradata[4] |= 0x03;
 188
 189         avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size);
 190
 191         av_freep(&rw_extradata);
 192     } else {
 193         avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size);
 194     }
 195
 196     config_info = CFDictionaryCreateMutable(kCFAllocatorDefault,
 197                                             4,
 198                                             &kCFTypeDictionaryKeyCallBacks,
 199                                             &kCFTypeDictionaryValueCallBacks);
 200
 201     height   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height);
 202     width    = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width);
 203     format   = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format);
 204
 205     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height);
 206     CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width);
 207     CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format);
 208     CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data);
 209
 210     buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault,
 211                                                   2,
 212                                                   &kCFTypeDictionaryKeyCallBacks,
 213                                                   &kCFTypeDictionaryValueCallBacks);
 214     io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault,
 215                                                       0,
 216                                                       &kCFTypeDictionaryKeyCallBacks,
 217                                                       &kCFTypeDictionaryValueCallBacks);
 218     cv_pix_fmt  = CFNumberCreate(kCFAllocatorDefault,
 219                                  kCFNumberSInt32Type,
 220                                  &vda_ctx->cv_pix_fmt_type);
 221     CFDictionarySetValue(buffer_attributes,
 222                          kCVPixelBufferPixelFormatTypeKey,
 223                          cv_pix_fmt);
 224     CFDictionarySetValue(buffer_attributes,
 225                          kCVPixelBufferIOSurfacePropertiesKey,
 226                          io_surface_properties);
 227
 228     status = VDADecoderCreate(config_info,
 229                               buffer_attributes,
 230                               vda_decoder_callback,
 231                               vda_ctx,
 232                               &vda_ctx->decoder);
 233
 234     CFRelease(height);
 235     CFRelease(width);
 236     CFRelease(format);
 237     CFRelease(avc_data);
 238     CFRelease(config_info);
 239     CFRelease(io_surface_properties);
 240     CFRelease(cv_pix_fmt);
 241     CFRelease(buffer_attributes);
 242
 243     return status;
 244 }
 245
 246 int ff_vda_destroy_decoder(struct vda_context *vda_ctx)
 247 {
 248     OSStatus status = kVDADecoderNoErr;
 249
 250     if (vda_ctx->decoder)
 251         status = VDADecoderDestroy(vda_ctx->decoder);
 252
 253     av_freep(&vda_ctx->priv_bitstream);
 254
 255     return status;
 256 }
 257
 258 AVHWAccel ff_h264_vda_hwaccel = {
 259     .name           = "h264_vda",
 260     .type           = AVMEDIA_TYPE_VIDEO,
 261     .id             = AV_CODEC_ID_H264,
 262     .pix_fmt        = AV_PIX_FMT_VDA_VLD,
 263     .start_frame    = vda_h264_start_frame,
 264     .decode_slice   = vda_h264_decode_slice,
 265     .end_frame      = vda_h264_end_frame,
 266 };