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@ -27,33 +27,33 @@ const uint8_t *ff_avc_find_startcode(const uint8_t *p, const uint8_t *end) |
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{ |
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const uint8_t *a = p + 4 - ((intptr_t)p & 3); |
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for( end -= 3; p < a && p < end; p++ ) { |
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if( p[0] == 0 && p[1] == 0 && p[2] == 1 ) |
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for (end -= 3; p < a && p < end; p++) { |
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if (p[0] == 0 && p[1] == 0 && p[2] == 1) |
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return p; |
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} |
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for( end -= 3; p < end; p += 4 ) { |
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for (end -= 3; p < end; p += 4) { |
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uint32_t x = *(const uint32_t*)p; |
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// if( (x - 0x01000100) & (~x) & 0x80008000 ) // little endian
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// if( (x - 0x00010001) & (~x) & 0x00800080 ) // big endian
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if( (x - 0x01010101) & (~x) & 0x80808080 ) { // generic
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if( p[1] == 0 ) { |
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if( p[0] == 0 && p[2] == 1 ) |
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// if ((x - 0x01000100) & (~x) & 0x80008000) // little endian
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// if ((x - 0x00010001) & (~x) & 0x00800080) // big endian
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if ((x - 0x01010101) & (~x) & 0x80808080) { // generic
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if (p[1] == 0) { |
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if (p[0] == 0 && p[2] == 1) |
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return p-1; |
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if( p[2] == 0 && p[3] == 1 ) |
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if (p[2] == 0 && p[3] == 1) |
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return p; |
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} |
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if( p[3] == 0 ) { |
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if( p[2] == 0 && p[4] == 1 ) |
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if (p[3] == 0) { |
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if (p[2] == 0 && p[4] == 1) |
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return p+1; |
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if( p[4] == 0 && p[5] == 1 ) |
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if (p[4] == 0 && p[5] == 1) |
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return p+2; |
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} |
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} |
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} |
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for( end += 3; p < end; p++ ) { |
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if( p[0] == 0 && p[1] == 0 && p[2] == 1 ) |
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for (end += 3; p < end; p++) { |
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if (p[0] == 0 && p[1] == 0 && p[2] == 1) |
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return p; |
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} |
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