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