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Merge commit 'd613091f8858d87789916e2bd7a84ea3144077d4'

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* commit 'd613091f8858d87789916e2bd7a84ea3144077d4':
  sgi: decode 16bit RLE images

Conflicts:
	Changelog

Merged-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-04-01 04:19:27 +02:00
commit 767b1daf4b
2 changed files with 51 additions and 6 deletions
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Changelog
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@ -12,6 +12,7 @@ version <next>:
- Improvments to the XBM decoder
- QTKit input device
- improvments to OpenEXR image decoder
- support decoding 16-bit RLE SGI images
version 2.2:

56
libavcodec/sgidec.c
View File

@ -44,8 +44,8 @@ typedef struct SgiState {
* @param pixelstride pixel stride of input buffer
* @return size of output in bytes, else return error code.
*/
static int expand_rle_row(SgiState *s, uint8_t *out_buf,
int len, int pixelstride)
static int expand_rle_row8(SgiState *s, uint8_t *out_buf,
int len, int pixelstride)
{
unsigned char pixel, count;
unsigned char *orig = out_buf;
@ -82,6 +82,46 @@ static int expand_rle_row(SgiState *s, uint8_t *out_buf,
return (out_buf - orig) / pixelstride;
}
static int expand_rle_row16(SgiState *s, uint16_t *out_buf,
int len, int pixelstride)
{
unsigned short pixel;
unsigned char count;
unsigned short *orig = out_buf;
uint16_t *out_end = out_buf + len;
while (out_buf < out_end) {
if (bytestream2_get_bytes_left(&s->g) < 2)
return AVERROR_INVALIDDATA;
pixel = bytestream2_get_be16u(&s->g);
if (!(count = (pixel & 0x7f)))
break;
/* Check for buffer overflow. */
if (pixelstride * (count - 1) >= len) {
av_log(s->avctx, AV_LOG_ERROR, "Invalid pixel count.\n");
return AVERROR_INVALIDDATA;
}
if (pixel & 0x80) {
while (count--) {
pixel = bytestream2_get_ne16(&s->g);
AV_WN16A(out_buf, pixel);
out_buf += pixelstride;
}
} else {
pixel = bytestream2_get_ne16(&s->g);
while (count--) {
AV_WN16A(out_buf, pixel);
out_buf += pixelstride;
}
}
}
return (out_buf - orig) / pixelstride;
}
/**
* Read a run length encoded SGI image.
* @param out_buf output buffer
@ -95,6 +135,7 @@ static int read_rle_sgi(uint8_t *out_buf, SgiState *s)
GetByteContext g_table = s->g;
unsigned int y, z;
unsigned int start_offset;
int linesize, ret;
/* size of RLE offset and length tables */
if (len * 2 > bytestream2_get_bytes_left(&s->g)) {
@ -104,13 +145,16 @@ static int read_rle_sgi(uint8_t *out_buf, SgiState *s)
for (z = 0; z < s->depth; z++) {
dest_row = out_buf;
for (y = 0; y < s->height; y++) {
linesize = s->width * s->depth * s->bytes_per_channel;
dest_row -= s->linesize;
start_offset = bytestream2_get_be32(&g_table);
bytestream2_seek(&s->g, start_offset, SEEK_SET);
if (expand_rle_row(s, dest_row + z, s->width * s->depth,
s->depth) != s->width) {
if (s->bytes_per_channel == 1)
ret = expand_rle_row8(s, dest_row + z, linesize, s->depth);
else
ret = expand_rle_row16(s, (uint16_t *)dest_row + z, linesize, s->depth);
if (ret != s->width)
return AVERROR_INVALIDDATA;
}
}
}
return 0;
@ -184,7 +228,7 @@ static int decode_frame(AVCodecContext *avctx,
s->height = bytestream2_get_be16u(&s->g);
s->depth = bytestream2_get_be16u(&s->g);
if (s->bytes_per_channel != 1 && (s->bytes_per_channel != 2 || rle)) {
if (s->bytes_per_channel != 1 && s->bytes_per_channel != 2) {
av_log(avctx, AV_LOG_ERROR, "wrong channel number\n");
return AVERROR_INVALIDDATA;
}