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C++ VP56Context::parse_vector_models方法代码示例

本文整理汇总了C++中VP56Context::parse_vector_models方法的典型用法代码示例。如果您正苦于以下问题:C++ VP56Context::parse_vector_models方法的具体用法?C++ VP56Context::parse_vector_models怎么用?C++ VP56Context::parse_vector_models使用的例子?那么恭喜您, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在VP56Context的用法示例。


在下文中一共展示了VP56Context::parse_vector_models方法的2个代码示例,这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞,您的评价将有助于系统推荐出更棒的C++代码示例。

示例1: ff_vp56_decode_frame

int ff_vp56_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
                         AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    VP56Context *s = avctx->priv_data;
    AVFrame *const p = s->framep[VP56_FRAME_CURRENT];
    int remaining_buf_size = avpkt->size;
    int is_alpha, av_uninit(alpha_offset);

    if (s->has_alpha) {
        if (remaining_buf_size < 3)
            return -1;
        alpha_offset = bytestream_get_be24(&buf);
        remaining_buf_size -= 3;
        if (remaining_buf_size < alpha_offset)
            return -1;
    }

    for (is_alpha=0; is_alpha < 1+s->has_alpha; is_alpha++) {
        int mb_row, mb_col, mb_row_flip, mb_offset = 0;
        int block, y, uv, stride_y, stride_uv;
        int golden_frame = 0;
        int res;

        s->modelp = &s->models[is_alpha];

        res = s->parse_header(s, buf, remaining_buf_size, &golden_frame);
        if (!res)
            return -1;

        if (!is_alpha) {
            p->reference = 1;
            if (avctx->get_buffer(avctx, p) < 0) {
                av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
                return -1;
            }

            if (res == 2)
                if (vp56_size_changed(avctx)) {
                    avctx->release_buffer(avctx, p);
                    return -1;
                }
        }

        if (p->key_frame) {
            p->pict_type = AV_PICTURE_TYPE_I;
            s->default_models_init(s);
            for (block=0; block<s->mb_height*s->mb_width; block++)
                s->macroblocks[block].type = VP56_MB_INTRA;
        } else {
            p->pict_type = AV_PICTURE_TYPE_P;
            vp56_parse_mb_type_models(s);
            s->parse_vector_models(s);
            s->mb_type = VP56_MB_INTER_NOVEC_PF;
        }

        s->parse_coeff_models(s);

        memset(s->prev_dc, 0, sizeof(s->prev_dc));
        s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
        s->prev_dc[2][VP56_FRAME_CURRENT] = 128;

        for (block=0; block < 4*s->mb_width+6; block++) {
            s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
            s->above_blocks[block].dc_coeff = 0;
            s->above_blocks[block].not_null_dc = 0;
        }
        s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
        s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;

        stride_y  = p->linesize[0];
        stride_uv = p->linesize[1];

        if (s->flip < 0)
            mb_offset = 7;

        /* main macroblocks loop */
        for (mb_row=0; mb_row<s->mb_height; mb_row++) {
            if (s->flip < 0)
                mb_row_flip = s->mb_height - mb_row - 1;
            else
                mb_row_flip = mb_row;

            for (block=0; block<4; block++) {
                s->left_block[block].ref_frame = VP56_FRAME_NONE;
                s->left_block[block].dc_coeff = 0;
                s->left_block[block].not_null_dc = 0;
            }
            memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
            memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));

            s->above_block_idx[0] = 1;
            s->above_block_idx[1] = 2;
            s->above_block_idx[2] = 1;
            s->above_block_idx[3] = 2;
            s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
            s->above_block_idx[5] = 3*s->mb_width + 4 + 1;

            s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
            s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
//.........这里部分代码省略.........
开发者ID:Unhelpful,项目名称:ffmpeg,代码行数:101,代码来源:vp56.c

示例2: memset

static int ff_vp56_decode_mbs(AVCodecContext *avctx, void *data,
                              int jobnr, int threadnr)
{
    VP56Context *s0 = avctx->priv_data;
    int is_alpha = (jobnr == 1);
    VP56Context *s = is_alpha ? s0->alpha_context : s0;
    AVFrame *const p = s->frames[VP56_FRAME_CURRENT];
    int mb_row, mb_col, mb_row_flip, mb_offset = 0;
    int block, y, uv;
    ptrdiff_t stride_y, stride_uv;
    int res;

    if (p->key_frame) {
        p->pict_type = AV_PICTURE_TYPE_I;
        s->default_models_init(s);
        for (block=0; block<s->mb_height*s->mb_width; block++)
            s->macroblocks[block].type = VP56_MB_INTRA;
    } else {
        p->pict_type = AV_PICTURE_TYPE_P;
        vp56_parse_mb_type_models(s);
        s->parse_vector_models(s);
        s->mb_type = VP56_MB_INTER_NOVEC_PF;
    }

    if (s->parse_coeff_models(s))
        goto next;

    memset(s->prev_dc, 0, sizeof(s->prev_dc));
    s->prev_dc[1][VP56_FRAME_CURRENT] = 128;
    s->prev_dc[2][VP56_FRAME_CURRENT] = 128;

    for (block=0; block < 4*s->mb_width+6; block++) {
        s->above_blocks[block].ref_frame = VP56_FRAME_NONE;
        s->above_blocks[block].dc_coeff = 0;
        s->above_blocks[block].not_null_dc = 0;
    }
    s->above_blocks[2*s->mb_width + 2].ref_frame = VP56_FRAME_CURRENT;
    s->above_blocks[3*s->mb_width + 4].ref_frame = VP56_FRAME_CURRENT;

    stride_y  = p->linesize[0];
    stride_uv = p->linesize[1];

    if (s->flip < 0)
        mb_offset = 7;

    /* main macroblocks loop */
    for (mb_row=0; mb_row<s->mb_height; mb_row++) {
        if (s->flip < 0)
            mb_row_flip = s->mb_height - mb_row - 1;
        else
            mb_row_flip = mb_row;

        for (block=0; block<4; block++) {
            s->left_block[block].ref_frame = VP56_FRAME_NONE;
            s->left_block[block].dc_coeff = 0;
            s->left_block[block].not_null_dc = 0;
        }
        memset(s->coeff_ctx, 0, sizeof(s->coeff_ctx));
        memset(s->coeff_ctx_last, 24, sizeof(s->coeff_ctx_last));

        s->above_block_idx[0] = 1;
        s->above_block_idx[1] = 2;
        s->above_block_idx[2] = 1;
        s->above_block_idx[3] = 2;
        s->above_block_idx[4] = 2*s->mb_width + 2 + 1;
        s->above_block_idx[5] = 3*s->mb_width + 4 + 1;

        s->block_offset[s->frbi] = (mb_row_flip*16 + mb_offset) * stride_y;
        s->block_offset[s->srbi] = s->block_offset[s->frbi] + 8*stride_y;
        s->block_offset[1] = s->block_offset[0] + 8;
        s->block_offset[3] = s->block_offset[2] + 8;
        s->block_offset[4] = (mb_row_flip*8 + mb_offset) * stride_uv;
        s->block_offset[5] = s->block_offset[4];

        for (mb_col=0; mb_col<s->mb_width; mb_col++) {
            vp56_decode_mb(s, mb_row, mb_col, is_alpha);

            for (y=0; y<4; y++) {
                s->above_block_idx[y] += 2;
                s->block_offset[y] += 16;
            }

            for (uv=4; uv<6; uv++) {
                s->above_block_idx[uv] += 1;
                s->block_offset[uv] += 8;
            }
        }
    }

next:
    if (p->key_frame || s->golden_frame) {
        av_frame_unref(s->frames[VP56_FRAME_GOLDEN]);
        if ((res = av_frame_ref(s->frames[VP56_FRAME_GOLDEN], p)) < 0)
            return res;
    }

    av_frame_unref(s->frames[VP56_FRAME_PREVIOUS]);
    FFSWAP(AVFrame *, s->frames[VP56_FRAME_CURRENT],
                      s->frames[VP56_FRAME_PREVIOUS]);
    return 0;
//.........这里部分代码省略.........
开发者ID:Ancaro,项目名称:stepmania,代码行数:101,代码来源:vp56.c


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