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