int ff_vda_create_decoder(struct vda_context *vda_ctx, uint8_t *extradata, int extradata_size) { OSStatus status = kVDADecoderNoErr; CFNumberRef height; CFNumberRef width; CFNumberRef format; CFDataRef avc_data; CFMutableDictionaryRef config_info; CFMutableDictionaryRef buffer_attributes; CFMutableDictionaryRef io_surface_properties; CFNumberRef cv_pix_fmt; /* Each VCL NAL in the bistream sent to the decoder * is preceded by a 4 bytes length header. * Change the avcC atom header if needed, to signal headers of 4 bytes. */ if (extradata_size >= 4 && (extradata[4] & 0x03) != 0x03) { uint8_t *rw_extradata; if (!(rw_extradata = av_malloc(extradata_size))) return AVERROR(ENOMEM); memcpy(rw_extradata, extradata, extradata_size); rw_extradata[4] |= 0x03; avc_data = CFDataCreate(kCFAllocatorDefault, rw_extradata, extradata_size); av_freep(&rw_extradata); } else { avc_data = CFDataCreate(kCFAllocatorDefault, extradata, extradata_size); } config_info = CFDictionaryCreateMutable(kCFAllocatorDefault, 4, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); height = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->height); width = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->width); format = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->format); CFDictionarySetValue(config_info, kVDADecoderConfiguration_Height, height); CFDictionarySetValue(config_info, kVDADecoderConfiguration_Width, width); CFDictionarySetValue(config_info, kVDADecoderConfiguration_SourceFormat, format); CFDictionarySetValue(config_info, kVDADecoderConfiguration_avcCData, avc_data); buffer_attributes = CFDictionaryCreateMutable(kCFAllocatorDefault, 2, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); io_surface_properties = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks); cv_pix_fmt = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &vda_ctx->cv_pix_fmt_type); CFDictionarySetValue(buffer_attributes, kCVPixelBufferPixelFormatTypeKey, cv_pix_fmt); CFDictionarySetValue(buffer_attributes, kCVPixelBufferIOSurfacePropertiesKey, io_surface_properties); status = VDADecoderCreate(config_info, buffer_attributes, vda_decoder_callback, vda_ctx, &vda_ctx->decoder); CFRelease(height); CFRelease(width); CFRelease(format); CFRelease(avc_data); CFRelease(config_info); CFRelease(io_surface_properties); CFRelease(cv_pix_fmt); CFRelease(buffer_attributes); return status; }