/*

  * This file is part of FFmpeg.

  *

  * FFmpeg is free software; you can redistribute it and/or

  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  *

  * FFmpeg is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Lesser General Public License for more details.
  *
  * You should have received a copy of the GNU Lesser General Public

  * License along with FFmpeg; if not, write to the Free Software

  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
 #include "libavcodec/avcodec.h"
 #include "libavcodec/vda.h"
 #include "libavutil/imgutils.h"
 

 #include "ffmpeg.h"

 
 typedef struct VDAContext {
     AVFrame *tmp_frame;
 } VDAContext;
 
 static int vda_retrieve_data(AVCodecContext *s, AVFrame *frame)
 {
     InputStream *ist = s->opaque;
     VDAContext  *vda = ist->hwaccel_ctx;
     CVPixelBufferRef pixbuf = (CVPixelBufferRef)frame->data[3];
     OSType pixel_format = CVPixelBufferGetPixelFormatType(pixbuf);
     CVReturn err;
     uint8_t *data[4] = { 0 };
     int linesize[4] = { 0 };
     int planes, ret, i;
 
     av_frame_unref(vda->tmp_frame);
 
     switch (pixel_format) {
     case kCVPixelFormatType_420YpCbCr8Planar: vda->tmp_frame->format = AV_PIX_FMT_YUV420P; break;
     case kCVPixelFormatType_422YpCbCr8:       vda->tmp_frame->format = AV_PIX_FMT_UYVY422; break;
     default:
         av_log(NULL, AV_LOG_ERROR,
                "Unsupported pixel format: %u\n", pixel_format);
         return AVERROR(ENOSYS);
     }
 
     vda->tmp_frame->width  = frame->width;
     vda->tmp_frame->height = frame->height;
     ret = av_frame_get_buffer(vda->tmp_frame, 32);
     if (ret < 0)
         return ret;
 
     err = CVPixelBufferLockBaseAddress(pixbuf, kCVPixelBufferLock_ReadOnly);
     if (err != kCVReturnSuccess) {
         av_log(NULL, AV_LOG_ERROR, "Error locking the pixel buffer.\n");
         return AVERROR_UNKNOWN;
     }
 
     if (CVPixelBufferIsPlanar(pixbuf)) {
 
         planes = CVPixelBufferGetPlaneCount(pixbuf);
         for (i = 0; i < planes; i++) {
             data[i]     = CVPixelBufferGetBaseAddressOfPlane(pixbuf, i);
             linesize[i] = CVPixelBufferGetBytesPerRowOfPlane(pixbuf, i);
         }
     } else {
         data[0] = CVPixelBufferGetBaseAddress(pixbuf);
         linesize[0] = CVPixelBufferGetBytesPerRow(pixbuf);
     }
 
     av_image_copy(vda->tmp_frame->data, vda->tmp_frame->linesize,
                   data, linesize, vda->tmp_frame->format,
                   frame->width, frame->height);
 
     ret = av_frame_copy_props(vda->tmp_frame, frame);

     CVPixelBufferUnlockBaseAddress(pixbuf, kCVPixelBufferLock_ReadOnly);
 

     if (ret < 0)
         return ret;
 
     av_frame_unref(frame);
     av_frame_move_ref(frame, vda->tmp_frame);
 
     return 0;
 }
 
 static void vda_uninit(AVCodecContext *s)
 {
     InputStream *ist = s->opaque;
     VDAContext  *vda = ist->hwaccel_ctx;
 
     ist->hwaccel_uninit        = NULL;
     ist->hwaccel_retrieve_data = NULL;
 
     av_frame_free(&vda->tmp_frame);
 
     av_vda_default_free(s);
     av_freep(&ist->hwaccel_ctx);
 }
 
 int vda_init(AVCodecContext *s)
 {
     InputStream *ist = s->opaque;
     int loglevel = (ist->hwaccel_id == HWACCEL_AUTO) ? AV_LOG_VERBOSE : AV_LOG_ERROR;
     VDAContext *vda;
     int ret;
 
     vda = av_mallocz(sizeof(*vda));
     if (!vda)
         return AVERROR(ENOMEM);
 
     ist->hwaccel_ctx           = vda;
     ist->hwaccel_uninit        = vda_uninit;
     ist->hwaccel_retrieve_data = vda_retrieve_data;
 
     vda->tmp_frame = av_frame_alloc();
     if (!vda->tmp_frame) {
         ret = AVERROR(ENOMEM);
         goto fail;
     }
 
     ret = av_vda_default_init(s);
     if (ret < 0) {
         av_log(NULL, loglevel, "Error creating VDA decoder.\n");
         goto fail;
     }
 
     return 0;
 fail:
     vda_uninit(s);
     return ret;
 }