Merge remote-tracking branch 'qatar/master'

* qatar/master:
  dxtory: compressed RGB555/RGB565 decoding support

Conflicts:
	libavcodec/dxtory.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
pull/54/head
Michael Niedermayer 11 years ago
commit 4b84a69ebb
  1. 113
      libavcodec/dxtory.c

@ -170,6 +170,8 @@ static int dxtory_decode_v1_444(AVCodecContext *avctx, AVFrame *pic,
}
static const uint8_t def_lru[8] = { 0x00, 0x20, 0x40, 0x60, 0x80, 0xA0, 0xC0, 0xFF };
static const uint8_t def_lru_555[8] = { 0x00, 0x08, 0x10, 0x18, 0x1F };
static const uint8_t def_lru_565[8] = { 0x00, 0x08, 0x10, 0x20, 0x30, 0x3F };
static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
{
@ -188,6 +190,110 @@ static inline uint8_t decode_sym(GetBitContext *gb, uint8_t lru[8])
return val;
}
static inline uint8_t decode_sym_565(GetBitContext *gb, uint8_t lru[8],
int bits)
{
uint8_t c, val;
c = get_unary(gb, 0, bits);
if (!c) {
val = get_bits(gb, bits);
memmove(lru + 1, lru, sizeof(*lru) * (6 - 1));
} else {
val = lru[c - 1];
memmove(lru + 1, lru, sizeof(*lru) * (c - 1));
}
lru[0] = val;
return val;
}
static int dx2_decode_slice_565(GetBitContext *gb, int width, int height,
uint8_t *dst, int stride, int is_565)
{
int x, y;
int r, g, b;
uint8_t lru[3][8];
memcpy(lru[0], def_lru_555, 8 * sizeof(*def_lru));
memcpy(lru[1], is_565 ? def_lru_565 : def_lru_555, 8 * sizeof(*def_lru));
memcpy(lru[2], def_lru_555, 8 * sizeof(*def_lru));
for (y = 0; y < height; y++) {
for (x = 0; x < width; x++) {
b = decode_sym_565(gb, lru[0], 5);
g = decode_sym_565(gb, lru[1], is_565 ? 6 : 5);
r = decode_sym_565(gb, lru[2], 5);
dst[x * 3 + 0] = (r << 3) | (r >> 2);
dst[x * 3 + 1] = is_565 ? (g << 2) | (g >> 4) : (g << 3) | (g >> 2);
dst[x * 3 + 2] = (b << 3) | (b >> 2);
}
dst += stride;
}
return 0;
}
static int dxtory_decode_v2_565(AVCodecContext *avctx, AVFrame *pic,
const uint8_t *src, int src_size, int is_565)
{
GetByteContext gb;
GetBitContext gb2;
int nslices, slice, slice_height;
uint32_t off, slice_size;
uint8_t *dst;
int ret;
bytestream2_init(&gb, src, src_size);
nslices = bytestream2_get_le16(&gb);
off = FFALIGN(nslices * 4 + 2, 16);
if (src_size < off) {
av_log(avctx, AV_LOG_ERROR, "no slice data\n");
return AVERROR_INVALIDDATA;
}
if (!nslices || avctx->height % nslices) {
avpriv_request_sample(avctx, "%d slices for %dx%d", nslices,
avctx->width, avctx->height);
return AVERROR_PATCHWELCOME;
}
slice_height = avctx->height / nslices;
avctx->pix_fmt = AV_PIX_FMT_RGB24;
if ((ret = ff_get_buffer(avctx, pic, 0)) < 0)
return ret;
dst = pic->data[0];
for (slice = 0; slice < nslices; slice++) {
slice_size = bytestream2_get_le32(&gb);
if (slice_size > src_size - off) {
av_log(avctx, AV_LOG_ERROR,
"invalid slice size %d (only %d bytes left)\n",
slice_size, src_size - off);
return AVERROR_INVALIDDATA;
}
if (slice_size <= 16) {
av_log(avctx, AV_LOG_ERROR, "invalid slice size %d\n", slice_size);
return AVERROR_INVALIDDATA;
}
if (AV_RL32(src + off) != slice_size - 16) {
av_log(avctx, AV_LOG_ERROR,
"Slice sizes mismatch: got %d instead of %d\n",
AV_RL32(src + off), slice_size - 16);
}
init_get_bits(&gb2, src + off + 16, (slice_size - 16) * 8);
dx2_decode_slice_565(&gb2, avctx->width, slice_height, dst,
pic->linesize[0], is_565);
dst += pic->linesize[0] * slice_height;
off += slice_size;
}
return 0;
}
static int dx2_decode_slice_rgb(GetBitContext *gb, int width, int height,
uint8_t *dst, int stride)
{
@ -609,11 +715,18 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
AV_PIX_FMT_RGB565LE, 2);
break;
case 0x17000009:
ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 1);
break;
case 0x18000001:
case 0x19000001:
ret = dxtory_decode_v1_rgb(avctx, pic, src + 16, avpkt->size - 16,
AV_PIX_FMT_RGB555LE, 2);
break;
case 0x18000009:
case 0x19000009:
ret = dxtory_decode_v2_565(avctx, pic, src + 16, avpkt->size - 16, 0);
break;
default:
avpriv_request_sample(avctx, "Frame header %X", AV_RB32(src));
return AVERROR_PATCHWELCOME;

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