/*
 * 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;
}