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mss1: merge decode_intra() and decode_inter()

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They have most of their code in common.
This commit is contained in:
Kostya Shishkov 2012-08-26 13:46:57 +02:00
parent b42be2d56a
commit 49df339f4b
1 changed files with 14 additions and 50 deletions
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64
libavcodec/mss1.c
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@ -80,6 +80,7 @@ typedef struct MSS1Context {
int mask_linesize;
uint32_t pal[256];
int free_colours;
int keyframe;
Model intra_region, inter_region;
Model pivot, edge_mode, split_mode;
PixContext intra_pix_ctx, inter_pix_ctx;
@ -607,44 +608,6 @@ static int decode_region_intra(MSS1Context *ctx, ArithCoder *acoder,
return 0;
}
static int decode_intra(MSS1Context *ctx, ArithCoder *acoder,
int x, int y, int width, int height)
{
int mode, pivot;
if (ctx->corrupted)
return -1;
mode = arith_get_model_sym(acoder, &ctx->split_mode);
switch (mode) {
case SPLIT_VERT:
pivot = decode_pivot(ctx, acoder, height);
if (ctx->corrupted)
return -1;
if (decode_intra(ctx, acoder, x, y, width, pivot))
return -1;
if (decode_intra(ctx, acoder, x, y + pivot, width, height - pivot))
return -1;
break;
case SPLIT_HOR:
pivot = decode_pivot(ctx, acoder, width);
if (ctx->corrupted)
return -1;
if (decode_intra(ctx, acoder, x, y, pivot, height))
return -1;
if (decode_intra(ctx, acoder, x + pivot, y, width - pivot, height))
return -1;
break;
case SPLIT_NONE:
return decode_region_intra(ctx, acoder, x, y, width, height);
default:
return -1;
}
return 0;
}
static int decode_region_inter(MSS1Context *ctx, ArithCoder *acoder,
int x, int y, int width, int height)
{
@ -674,8 +637,8 @@ static int decode_region_inter(MSS1Context *ctx, ArithCoder *acoder,
return 0;
}
static int decode_inter(MSS1Context *ctx, ArithCoder *acoder,
int x, int y, int width, int height)
static int decode_rect(MSS1Context *ctx, ArithCoder *acoder,
int x, int y, int width, int height)
{
int mode, pivot;
@ -687,20 +650,23 @@ static int decode_inter(MSS1Context *ctx, ArithCoder *acoder,
switch (mode) {
case SPLIT_VERT:
pivot = decode_pivot(ctx, acoder, height);
if (decode_inter(ctx, acoder, x, y, width, pivot))
if (decode_rect(ctx, acoder, x, y, width, pivot))
return -1;
if (decode_inter(ctx, acoder, x, y + pivot, width, height - pivot))
if (decode_rect(ctx, acoder, x, y + pivot, width, height - pivot))
return -1;
break;
case SPLIT_HOR:
pivot = decode_pivot(ctx, acoder, width);
if (decode_inter(ctx, acoder, x, y, pivot, height))
if (decode_rect(ctx, acoder, x, y, pivot, height))
return -1;
if (decode_inter(ctx, acoder, x + pivot, y, width - pivot, height))
if (decode_rect(ctx, acoder, x + pivot, y, width - pivot, height))
return -1;
break;
case SPLIT_NONE:
return decode_region_inter(ctx, acoder, x, y, width, height);
if (ctx->keyframe)
return decode_region_intra(ctx, acoder, x, y, width, height);
else
return decode_region_inter(ctx, acoder, x, y, width, height);
default:
return -1;
}
@ -732,21 +698,19 @@ static int mss1_decode_frame(AVCodecContext *avctx, void *data, int *data_size,
c->pic_start = c->pic.data[0] + c->pic.linesize[0] * (avctx->height - 1);
c->pic_stride = -c->pic.linesize[0];
if (!arith_get_bit(&acoder)) {
c->keyframe = !arith_get_bit(&acoder);
if (c->keyframe) {
codec_reset(c);
pal_changed = decode_pal(c, &acoder);
c->corrupted = decode_intra(c, &acoder, 0, 0,
avctx->width, avctx->height);
c->pic.key_frame = 1;
c->pic.pict_type = AV_PICTURE_TYPE_I;
} else {
if (c->corrupted)
return AVERROR_INVALIDDATA;
c->corrupted = decode_inter(c, &acoder, 0, 0,
avctx->width, avctx->height);
c->pic.key_frame = 0;
c->pic.pict_type = AV_PICTURE_TYPE_P;
}
c->corrupted = decode_rect(c, &acoder, 0, 0, avctx->width, avctx->height);
if (c->corrupted)
return AVERROR_INVALIDDATA;
memcpy(c->pic.data[1], c->pal, AVPALETTE_SIZE);