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iff decoder: support RGB8 and RGBN

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This commit is contained in:
Peter Ross 2012-11-30 10:44:36 +11:00
parent 53ae32d331
commit 7016aa655b
1 changed files with 70 additions and 1 deletions
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71
libavcodec/iff.c
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@ -335,7 +335,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
avctx->pix_fmt = (avctx->bits_per_coded_sample < 8) ||
(avctx->extradata_size >= 2 && palette_size) ? AV_PIX_FMT_PAL8 : AV_PIX_FMT_GRAY8;
} else if (avctx->bits_per_coded_sample <= 32) {
if (avctx->codec_tag != MKTAG('D','E','E','P')) {
if (avctx->codec_tag == MKTAG('R','G','B','8')) {
avctx->pix_fmt = AV_PIX_FMT_RGB32;
} else if (avctx->codec_tag == MKTAG('R','G','B','N')) {
avctx->pix_fmt = AV_PIX_FMT_RGB444;
} else if (avctx->codec_tag != MKTAG('D','E','E','P')) {
if (avctx->bits_per_coded_sample == 24) {
avctx->pix_fmt = AV_PIX_FMT_RGB0;
} else if (avctx->bits_per_coded_sample == 32) {
@ -484,6 +488,61 @@ static int decode_byterun(uint8_t *dst, int dst_size,
return buf - buf_start;
}
#define DECODE_RGBX_COMMON(pixel_size) \
if (!length) { \
length = bytestream2_get_byte(gb); \
if (!length) { \
length = bytestream2_get_be16(gb); \
if (!length) \
return; \
} \
} \
for (i = 0; i < length; i++) { \
*(uint32_t *)(dst + y*linesize + x * pixel_size) = pixel; \
x += 1; \
if (x >= width) { \
y += 1; \
if (y >= height) \
return; \
x = 0; \
} \
}
/**
* Decode RGB8 buffer
* @param[out] dst Destination buffer
* @param width Width of destination buffer (pixels)
* @param height Height of destination buffer (pixels)
* @param linesize Line size of destination buffer (bytes)
*/
static void decode_rgb8(GetByteContext *gb, uint8_t *dst, int width, int height, int linesize)
{
int x = 0, y = 0, i, length;
while (bytestream2_get_bytes_left(gb) >= 4) {
uint32_t pixel = 0xFF000000 | bytestream2_get_be24(gb);
length = bytestream2_get_byte(gb) & 0x7F;
DECODE_RGBX_COMMON(4)
}
}
/**
* Decode RGBN buffer
* @param[out] dst Destination buffer
* @param width Width of destination buffer (pixels)
* @param height Height of destination buffer (pixels)
* @param linesize Line size of destination buffer (bytes)
*/
static void decode_rgbn(GetByteContext *gb, uint8_t *dst, int width, int height, int linesize)
{
int x = 0, y = 0, i, length;
while (bytestream2_get_bytes_left(gb) >= 2) {
uint32_t pixel = bytestream2_get_be16u(gb);
length = pixel & 0x7;
pixel >>= 4;
DECODE_RGBX_COMMON(2)
}
}
/**
* Decode DEEP RLE 32-bit buffer
* @param[out] dst Destination buffer
@ -599,6 +658,7 @@ static int decode_frame(AVCodecContext *avctx,
const int buf_size = avpkt->size >= 2 ? avpkt->size - AV_RB16(avpkt->data) : 0;
const uint8_t *buf_end = buf+buf_size;
int y, plane, res;
GetByteContext gb;
if ((res = extract_header(avctx, avpkt)) < 0)
return res;
@ -770,6 +830,15 @@ static int decode_frame(AVCodecContext *avctx,
return unsupported(avctx);
}
break;
case 4:
bytestream2_init(&gb, buf, buf_size);
if (avctx->codec_tag == MKTAG('R','G','B','8'))
decode_rgb8(&gb, s->frame.data[0], avctx->width, avctx->height, s->frame.linesize[0]);
else if (avctx->codec_tag == MKTAG('R','G','B','N'))
decode_rgbn(&gb, s->frame.data[0], avctx->width, avctx->height, s->frame.linesize[0]);
else
return unsupported(avctx);
break;
case 5:
if (avctx->codec_tag == MKTAG('D','E','E','P')) {
const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(avctx->pix_fmt);