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author | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-08-12 15:05:58 +0000 |
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committer | Stefano Sabatini <stefano.sabatini-lala@poste.it> | 2010-08-12 15:05:58 +0000 |
commit | 7906e2b974566c897526a8a7561b380687af8323 (patch) | |
tree | 77823797971eafea23a1473c944b78bcb86c5942 /libavcore/imgutils.c | |
parent | 27014bf5a3151f1e340d7ac170f3fdd3e0bcf395 (diff) | |
download | ffmpeg-streaming-7906e2b974566c897526a8a7561b380687af8323.zip ffmpeg-streaming-7906e2b974566c897526a8a7561b380687af8323.tar.gz |
Implement av_get_image_linesize() and use it in
ff_get_plane_bytewidth().
The new implementation is more generic, more compact and more correct.
Originally committed as revision 24786 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcore/imgutils.c')
-rw-r--r-- | libavcore/imgutils.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/libavcore/imgutils.c b/libavcore/imgutils.c index f3d75ee..84db01a 100644 --- a/libavcore/imgutils.c +++ b/libavcore/imgutils.c @@ -24,6 +24,30 @@ #include "imgutils.h" #include "libavutil/pixdesc.h" +int av_get_image_linesize(enum PixelFormat pix_fmt, int width, int plane) +{ + const AVPixFmtDescriptor *desc = &av_pix_fmt_descriptors[pix_fmt]; + int max_step [4]; /* max pixel step for each plane */ + int max_step_comp[4]; /* the component for each plane which has the max pixel step */ + int s, i; + + if (desc->flags & PIX_FMT_BITSTREAM) + return (width * (desc->comp[0].step_minus1+1) + 7) >> 3; + + memset(max_step , 0, sizeof(max_step )); + memset(max_step_comp, 0, sizeof(max_step_comp)); + for (i = 0; i < 4; i++) { + const AVComponentDescriptor *comp = &(desc->comp[i]); + if ((comp->step_minus1+1) > max_step[comp->plane]) { + max_step [comp->plane] = comp->step_minus1+1; + max_step_comp[comp->plane] = i; + } + } + + s = (max_step_comp[plane] == 1 || max_step_comp[plane] == 2) ? desc->log2_chroma_w : 0; + return max_step[plane] * (((width + (1 << s) - 1)) >> s); +} + int av_fill_image_linesizes(int linesizes[4], enum PixelFormat pix_fmt, int width) { int i; |