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