/*
  * H.26L/H.264/AVC/JVT/14496-10/... decoder
  * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
  *

  * 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
  */
 
 /**
  * @file
  * H.264 / AVC / MPEG4 part10 codec.
  * @author Michael Niedermayer <michaelni@gmx.at>
  */
 
 #include "libavutil/avassert.h"
 #include "libavutil/imgutils.h"
 #include "libavutil/timer.h"
 #include "internal.h"
 #include "cabac.h"
 #include "cabac_functions.h"
 #include "error_resilience.h"
 #include "avcodec.h"
 #include "h264.h"
 #include "h264data.h"
 #include "h264chroma.h"
 #include "h264_mvpred.h"
 #include "golomb.h"
 #include "mathops.h"
 #include "mpegutils.h"
 #include "rectangle.h"
 #include "thread.h"

 #include "vdpau_compat.h"

 
 void ff_h264_unref_picture(H264Context *h, H264Picture *pic)
 {
     int off = offsetof(H264Picture, tf) + sizeof(pic->tf);
     int i;
 

     if (!pic->f || !pic->f->buf[0])

         return;
 
     ff_thread_release_buffer(h->avctx, &pic->tf);
     av_buffer_unref(&pic->hwaccel_priv_buf);
 
     av_buffer_unref(&pic->qscale_table_buf);
     av_buffer_unref(&pic->mb_type_buf);
     for (i = 0; i < 2; i++) {
         av_buffer_unref(&pic->motion_val_buf[i]);
         av_buffer_unref(&pic->ref_index_buf[i]);
     }
 
     memset((uint8_t*)pic + off, 0, sizeof(*pic) - off);
 }
 
 int ff_h264_ref_picture(H264Context *h, H264Picture *dst, H264Picture *src)
 {
     int ret, i;
 

     av_assert0(!dst->f->buf[0]);
     av_assert0(src->f->buf[0]);

     src->tf.f = src->f;
     dst->tf.f = dst->f;

     ret = ff_thread_ref_frame(&dst->tf, &src->tf);
     if (ret < 0)
         goto fail;
 
     dst->qscale_table_buf = av_buffer_ref(src->qscale_table_buf);
     dst->mb_type_buf      = av_buffer_ref(src->mb_type_buf);
     if (!dst->qscale_table_buf || !dst->mb_type_buf)
         goto fail;
     dst->qscale_table = src->qscale_table;
     dst->mb_type      = src->mb_type;
 
     for (i = 0; i < 2; i++) {
         dst->motion_val_buf[i] = av_buffer_ref(src->motion_val_buf[i]);
         dst->ref_index_buf[i]  = av_buffer_ref(src->ref_index_buf[i]);
         if (!dst->motion_val_buf[i] || !dst->ref_index_buf[i])
             goto fail;
         dst->motion_val[i] = src->motion_val[i];
         dst->ref_index[i]  = src->ref_index[i];
     }
 
     if (src->hwaccel_picture_private) {
         dst->hwaccel_priv_buf = av_buffer_ref(src->hwaccel_priv_buf);
         if (!dst->hwaccel_priv_buf)
             goto fail;
         dst->hwaccel_picture_private = dst->hwaccel_priv_buf->data;
     }
 
     for (i = 0; i < 2; i++)
         dst->field_poc[i] = src->field_poc[i];
 
     memcpy(dst->ref_poc,   src->ref_poc,   sizeof(src->ref_poc));
     memcpy(dst->ref_count, src->ref_count, sizeof(src->ref_count));
 
     dst->poc           = src->poc;
     dst->frame_num     = src->frame_num;
     dst->mmco_reset    = src->mmco_reset;
     dst->pic_id        = src->pic_id;
     dst->long_ref      = src->long_ref;
     dst->mbaff         = src->mbaff;
     dst->field_picture = src->field_picture;
     dst->reference     = src->reference;

     dst->crop          = src->crop;
     dst->crop_left     = src->crop_left;
     dst->crop_top      = src->crop_top;

     dst->recovered     = src->recovered;

     dst->invalid_gap   = src->invalid_gap;

     dst->sei_recovery_frame_cnt = src->sei_recovery_frame_cnt;

 
     return 0;
 fail:
     ff_h264_unref_picture(h, dst);
     return ret;
 }
 

 void ff_h264_set_erpic(ERPicture *dst, H264Picture *src)

 {

 #if CONFIG_ERROR_RESILIENCE

     int i;
 

     memset(dst, 0, sizeof(*dst));
 

     if (!src)
         return;
 

     dst->f = src->f;

     dst->tf = &src->tf;
 
     for (i = 0; i < 2; i++) {
         dst->motion_val[i] = src->motion_val[i];
         dst->ref_index[i] = src->ref_index[i];
     }
 
     dst->mb_type = src->mb_type;
     dst->field_picture = src->field_picture;
 #endif /* CONFIG_ERROR_RESILIENCE */

 }

 int ff_h264_field_end(H264Context *h, H264SliceContext *sl, int in_setup)

 {
     AVCodecContext *const avctx = h->avctx;
     int err = 0;
     h->mb_y = 0;
 

 #if FF_API_CAP_VDPAU

     if (CONFIG_H264_VDPAU_DECODER &&

         h->avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)

         ff_vdpau_h264_set_reference_frames(h);

 #endif

 
     if (in_setup || !(avctx->active_thread_type & FF_THREAD_FRAME)) {
         if (!h->droppable) {
             err = ff_h264_execute_ref_pic_marking(h, h->mmco, h->mmco_index);
             h->prev_poc_msb = h->poc_msb;
             h->prev_poc_lsb = h->poc_lsb;
         }
         h->prev_frame_num_offset = h->frame_num_offset;
         h->prev_frame_num        = h->frame_num;
     }
 
     if (avctx->hwaccel) {

         err = avctx->hwaccel->end_frame(avctx);
         if (err < 0)

             av_log(avctx, AV_LOG_ERROR,
                    "hardware accelerator failed to decode picture\n");
     }
 

 #if FF_API_CAP_VDPAU

     if (CONFIG_H264_VDPAU_DECODER &&

         h->avctx->codec->capabilities & AV_CODEC_CAP_HWACCEL_VDPAU)

         ff_vdpau_h264_picture_complete(h);

 #endif

 #if CONFIG_ERROR_RESILIENCE

     av_assert0(sl == h->slice_ctx);

     /*
      * FIXME: Error handling code does not seem to support interlaced
      * when slices span multiple rows
      * The ff_er_add_slice calls don't work right for bottom
      * fields; they cause massive erroneous error concealing
      * Error marking covers both fields (top and bottom).
      * This causes a mismatched s->error_count
      * and a bad error table. Further, the error count goes to
      * INT_MAX when called for bottom field, because mb_y is
      * past end by one (callers fault) and resync_mb_y != 0
      * causes problems for the first MB line, too.
      */

     if (!FIELD_PICTURE(h) && h->current_slice && !h->sps.new && h->enable_er) {

         int use_last_pic = h->last_pic_for_ec.f->buf[0] && !sl->ref_count[0];

         ff_h264_set_erpic(&sl->er.cur_pic, h->cur_pic_ptr);

 
         if (use_last_pic) {

             ff_h264_set_erpic(&sl->er.last_pic, &h->last_pic_for_ec);

             sl->ref_list[0][0].parent = &h->last_pic_for_ec;

             memcpy(sl->ref_list[0][0].data, h->last_pic_for_ec.f->data, sizeof(sl->ref_list[0][0].data));
             memcpy(sl->ref_list[0][0].linesize, h->last_pic_for_ec.f->linesize, sizeof(sl->ref_list[0][0].linesize));

             sl->ref_list[0][0].reference = h->last_pic_for_ec.reference;

         } else if (sl->ref_count[0]) {

             ff_h264_set_erpic(&sl->er.last_pic, sl->ref_list[0][0].parent);

         } else

             ff_h264_set_erpic(&sl->er.last_pic, NULL);

         if (sl->ref_count[1])

             ff_h264_set_erpic(&sl->er.next_pic, sl->ref_list[1][0].parent);

         sl->er.ref_count = sl->ref_count[0];

         ff_er_frame_end(&sl->er);

         if (use_last_pic)

             memset(&sl->ref_list[0][0], 0, sizeof(sl->ref_list[0][0]));

     }

 #endif /* CONFIG_ERROR_RESILIENCE */
 

     if (!in_setup && !h->droppable)
         ff_thread_report_progress(&h->cur_pic_ptr->tf, INT_MAX,
                                   h->picture_structure == PICT_BOTTOM_FIELD);

     emms_c();
 
     h->current_slice = 0;
 
     return err;
 }