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@ -40,18 +40,8 @@ static VLC ir2_vlc; |
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/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ |
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/* Indeo 2 codes are in range 0x01..0x7F and 0x81..0x90 */ |
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static inline int ir2_get_code(GetBitContext *gb) |
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static inline int ir2_get_code(GetBitContext *gb) |
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{ |
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{ |
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int code; |
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return get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; |
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code = get_vlc2(gb, ir2_vlc.table, CODE_VLC_BITS, 1) + 1; |
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if (code >= 0x80) |
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return (code + 1); |
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return code; |
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} |
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} |
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#define CLAMP_TO_BYTE(value) \ |
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if (value > 255) \
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value = 255; \
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else if (value < 0) \
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value = 0; \
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static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride, |
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static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst, int stride, |
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const uint8_t *table) |
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const uint8_t *table) |
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@ -68,8 +58,8 @@ static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst |
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/* first line contain absolute values, other lines contain deltas */ |
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/* first line contain absolute values, other lines contain deltas */ |
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while (out < width){ |
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while (out < width){ |
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c = ir2_get_code(&ctx->gb); |
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c = ir2_get_code(&ctx->gb); |
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if(c > 0x80) { /* we have a run */ |
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if(c >= 0x80) { /* we have a run */ |
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c -= 0x80; |
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c -= 0x7F; |
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if(out + c*2 > width) |
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if(out + c*2 > width) |
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return -1; |
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return -1; |
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for (i = 0; i < c * 2; i++) |
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for (i = 0; i < c * 2; i++) |
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@ -85,8 +75,8 @@ static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst |
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out = 0; |
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out = 0; |
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while (out < width){ |
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while (out < width){ |
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c = ir2_get_code(&ctx->gb); |
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c = ir2_get_code(&ctx->gb); |
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if(c > 0x80) { /* we have a skip */ |
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if(c >= 0x80) { /* we have a skip */ |
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c -= 0x80; |
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c -= 0x7F; |
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if(out + c*2 > width) |
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if(out + c*2 > width) |
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return -1; |
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return -1; |
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for (i = 0; i < c * 2; i++) { |
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for (i = 0; i < c * 2; i++) { |
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@ -95,11 +85,11 @@ static int ir2_decode_plane(Ir2Context *ctx, int width, int height, uint8_t *dst |
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} |
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} |
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} else { /* add two deltas from table */ |
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} else { /* add two deltas from table */ |
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t = dst[out - stride] + (table[c * 2] - 128); |
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t = dst[out - stride] + (table[c * 2] - 128); |
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CLAMP_TO_BYTE(t); |
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t= clip_uint8(t); |
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dst[out] = t; |
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dst[out] = t; |
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out++; |
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out++; |
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t = dst[out - stride] + (table[(c * 2) + 1] - 128); |
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t = dst[out - stride] + (table[(c * 2) + 1] - 128); |
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CLAMP_TO_BYTE(t); |
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t= clip_uint8(t); |
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dst[out] = t; |
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dst[out] = t; |
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out++; |
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out++; |
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} |
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} |
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@ -124,16 +114,16 @@ static int ir2_decode_plane_inter(Ir2Context *ctx, int width, int height, uint8_ |
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out = 0; |
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out = 0; |
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while (out < width){ |
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while (out < width){ |
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c = ir2_get_code(&ctx->gb); |
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c = ir2_get_code(&ctx->gb); |
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if(c > 0x80) { /* we have a skip */ |
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if(c >= 0x80) { /* we have a skip */ |
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c -= 0x80; |
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c -= 0x7F; |
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out += c * 2; |
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out += c * 2; |
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} else { /* add two deltas from table */ |
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} else { /* add two deltas from table */ |
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t = dst[out] + (table[c * 2] - 128); |
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t = dst[out] + (table[c * 2] - 128); |
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CLAMP_TO_BYTE(t); |
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t= clip_uint8(t); |
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dst[out] = t; |
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dst[out] = t; |
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out++; |
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out++; |
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t = dst[out] + (table[(c * 2) + 1] - 128); |
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t = dst[out] + (table[(c * 2) + 1] - 128); |
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CLAMP_TO_BYTE(t); |
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t= clip_uint8(t); |
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dst[out] = t; |
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dst[out] = t; |
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out++; |
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out++; |
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} |
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} |
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