avcodec/mjpegdec: move shift_output() to its own function
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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c407c73457
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@ -1044,6 +1044,20 @@ static av_always_inline void mjpeg_copy_block(MJpegDecodeContext *s,
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}
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}
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static void shift_output(MJpegDecodeContext *s, uint8_t *ptr, int linesize)
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{
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int block_x, block_y;
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if (s->bits > 8) {
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for (block_y=0; block_y<8; block_y++)
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for (block_x=0; block_x<8; block_x++)
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*(uint16_t*)(ptr + 2*block_x + block_y*linesize) <<= 16 - s->bits;
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} else {
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for (block_y=0; block_y<8; block_y++)
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for (block_x=0; block_x<8; block_x++)
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*(ptr + block_x + block_y*linesize) <<= 8 - s->bits;
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}
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}
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static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
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int Al, const uint8_t *mb_bitmask,
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const AVFrame *reference)
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@ -1123,18 +1137,8 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah,
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return AVERROR_INVALIDDATA;
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}
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s->dsp.idct_put(ptr, linesize[c], s->block);
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if (s->bits & 7) {
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int block_x, block_y;
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if (s->bits > 8) {
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for (block_y=0; block_y<8; block_y++)
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for (block_x=0; block_x<8; block_x++)
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*(uint16_t*)(ptr + 2*block_x + block_y*linesize[c]) <<= 16 - s->bits;
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} else {
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for (block_y=0; block_y<8; block_y++)
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for (block_x=0; block_x<8; block_x++)
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*(ptr + 2*block_x + block_y*linesize[c]) <<= 8 - s->bits;
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}
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}
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if (s->bits & 7)
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shift_output(s, ptr, linesize[c]);
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}
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} else {
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int block_idx = s->block_stride[c] * (v * mb_y + y) +
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