C++ (Cpp) ff_mss12_decode_rectの例

コード例 #1

ファイル: mss1.c プロジェクト: 1051716/xbmc-1

static int mss1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                             AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    MSS1Context *ctx = avctx->priv_data;
    MSS12Context *c = &ctx->ctx;
    GetBitContext gb;
    ArithCoder acoder;
    int pal_changed = 0;
    int ret;

    init_get_bits(&gb, buf, buf_size * 8);
    arith_init(&acoder, &gb);

    ctx->pic.reference    = 3;
    ctx->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_READABLE |
                            FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
    if ((ret = avctx->reget_buffer(avctx, &ctx->pic)) < 0) {
        av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
        return ret;
    }

    c->pal_pic    =  ctx->pic.data[0] + ctx->pic.linesize[0] * (avctx->height - 1);
    c->pal_stride = -ctx->pic.linesize[0];
    c->keyframe   = !arith_get_bit(&acoder);
    if (c->keyframe) {
        c->corrupted = 0;
        ff_mss12_slicecontext_reset(&ctx->sc);
        pal_changed        = decode_pal(c, &acoder);
        ctx->pic.key_frame = 1;
        ctx->pic.pict_type = AV_PICTURE_TYPE_I;
    } else {
        if (c->corrupted)
            return AVERROR_INVALIDDATA;
        ctx->pic.key_frame = 0;
        ctx->pic.pict_type = AV_PICTURE_TYPE_P;
    }
    c->corrupted = ff_mss12_decode_rect(&ctx->sc, &acoder, 0, 0,
                                        avctx->width, avctx->height);
    if (c->corrupted)
        return AVERROR_INVALIDDATA;
    memcpy(ctx->pic.data[1], c->pal, AVPALETTE_SIZE);
    ctx->pic.palette_has_changed = pal_changed;

    *got_frame      = 1;
    *(AVFrame*)data = ctx->pic;

    /* always report that the buffer was completely consumed */
    return buf_size;
}

コード例 #2

ファイル: mss1.c プロジェクト: TaoheGit/hmi_sdl_android

static int mss1_decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
                             AVPacket *avpkt)
{
    MSS1Context *ctx = avctx->priv_data;
    MSS12Context *c = &ctx->ctx;
    GetBitContext gb;
    ArithCoder acoder;
    int pal_changed = 0;
    int ret;

    if ((ret = init_get_bits8(&gb, avpkt->data, avpkt->size)) < 0)
        return ret;

    arith_init(&acoder, &gb);

    if ((ret = ff_reget_buffer(avctx, ctx->pic)) < 0)
        return ret;

    c->pal_pic    =  ctx->pic->data[0] + ctx->pic->linesize[0] * (avctx->height - 1);
    c->pal_stride = -ctx->pic->linesize[0];
    c->keyframe   = !arith_get_bit(&acoder);
    if (c->keyframe) {
        c->corrupted = 0;
        ff_mss12_slicecontext_reset(&ctx->sc);
        pal_changed        = decode_pal(c, &acoder);
        ctx->pic->key_frame = 1;
        ctx->pic->pict_type = AV_PICTURE_TYPE_I;
    } else {
        if (c->corrupted)
            return AVERROR_INVALIDDATA;
        ctx->pic->key_frame = 0;
        ctx->pic->pict_type = AV_PICTURE_TYPE_P;
    }
    c->corrupted = ff_mss12_decode_rect(&ctx->sc, &acoder, 0, 0,
                                        avctx->width, avctx->height);
    if (c->corrupted)
        return AVERROR_INVALIDDATA;
    memcpy(ctx->pic->data[1], c->pal, AVPALETTE_SIZE);
    ctx->pic->palette_has_changed = pal_changed;

    if ((ret = av_frame_ref(data, ctx->pic)) < 0)
        return ret;

    *got_frame      = 1;

    /* always report that the buffer was completely consumed */
    return avpkt->size;
}