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Grayscale support. Patch by Sebastian Vater <cdgs basty googlemail com>.

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Originally committed as revision 23124 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Sebastian Vater 2010-05-13 19:16:03 +00:00 committed by Ronald S. Bultje
parent 57fcb7d7da
commit 7a0e859cdb
1 changed files with 21 additions and 5 deletions
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26
libavcodec/iff.c
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@ -110,6 +110,11 @@ static const uint32_t plane32_lut[32][16*4] = {
LUT32(28), LUT32(29), LUT32(30), LUT32(31),
};
// Gray to RGB, required for palette table of grayscale images with bpp < 8
static av_always_inline uint32_t gray2rgb(const uint32_t x) {
return x << 16 | x << 8 | x;
}
/**
* Convert CMAP buffer (stored in extradata) to lavc palette format
*/
@ -125,9 +130,17 @@ int ff_cmap_read_palette(AVCodecContext *avctx, uint32_t *pal)
count = 1 << avctx->bits_per_coded_sample;
// If extradata is smaller than actually needed, fill the remaining with black.
count = FFMIN(avctx->extradata_size / 3, count);
if (count) {
for (i=0; i < count; i++) {
pal[i] = 0xFF000000 | AV_RB24( avctx->extradata + i*3 );
}
} else { // Create gray-scale color palette for bps < 8
count = 1 << avctx->bits_per_coded_sample;
for (i=0; i < count; i++) {
pal[i] = 0xFF000000 | gray2rgb((i * 255) >> avctx->bits_per_coded_sample);
}
}
return 0;
}
@ -137,7 +150,9 @@ static av_cold int decode_init(AVCodecContext *avctx)
int err;
if (avctx->bits_per_coded_sample <= 8) {
avctx->pix_fmt = PIX_FMT_PAL8;
avctx->pix_fmt = (avctx->bits_per_coded_sample < 8 ||
avctx->extradata_size) ? PIX_FMT_PAL8
: PIX_FMT_GRAY8;
} else if (avctx->bits_per_coded_sample <= 32) {
avctx->pix_fmt = PIX_FMT_BGR32;
} else {
@ -157,7 +172,8 @@ static av_cold int decode_init(AVCodecContext *avctx)
return err;
}
return avctx->bits_per_coded_sample <= 8 ?
return (avctx->bits_per_coded_sample <= 8 &&
avctx->pix_fmt != PIX_FMT_GRAY8) ?
ff_cmap_read_palette(avctx, (uint32_t*)s->frame.data[1]) : 0;
}
@ -219,7 +235,7 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
}
if (avctx->codec_tag == MKTAG('I','L','B','M')) { // interleaved
if (avctx->pix_fmt == PIX_FMT_PAL8) {
if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
memset(row, 0, avctx->width);
@ -238,7 +254,7 @@ static int decode_frame_ilbm(AVCodecContext *avctx,
}
}
}
} else if (avctx->pix_fmt == PIX_FMT_PAL8) { // IFF-PBM
} else if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) { // IFF-PBM
for(y = 0; y < avctx->height; y++ ) {
uint8_t *row = &s->frame.data[0][y * s->frame.linesize[0]];
memcpy(row, buf, FFMIN(avctx->width, buf_end - buf));
@ -267,7 +283,7 @@ static int decode_frame_byterun1(AVCodecContext *avctx,
}
if (avctx->codec_tag == MKTAG('I','L','B','M')) { //interleaved
if (avctx->pix_fmt == PIX_FMT_PAL8) {
if (avctx->pix_fmt == PIX_FMT_PAL8 || avctx->pix_fmt == PIX_FMT_GRAY8) {
for(y = 0; y < avctx->height ; y++ ) {
uint8_t *row = &s->frame.data[0][ y*s->frame.linesize[0] ];
memset(row, 0, avctx->width);