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dfa: implement tdlt chunk decoding 

Sample & pseudo code provided by Vladimir "VAG" Gneushev.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2013-04-06 13:26:02 +00:00
parent 4bcb75cc48
commit 1adf54de56
1 changed files with 19 additions and 4 deletions
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23
libavcodec/dfa.c
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@ -288,9 +288,24 @@ static int decode_wdlt(GetByteContext *gb, uint8_t *frame, int width, int height
return 0;
}
static int decode_unk6(GetByteContext *gb, uint8_t *frame, int width, int height)
static int decode_tdlt(GetByteContext *gb, uint8_t *frame, int width, int height)
{
return AVERROR_PATCHWELCOME;
const uint8_t *frame_end = frame + width * height;
uint32_t segments = bytestream2_get_le32(gb);
while (segments--) {
int count = bytestream2_get_byte(gb) << 1;
int skip = bytestream2_get_byte(gb) << 1;
if (frame_end - frame < skip + count)
return AVERROR_INVALIDDATA;
frame += skip;
if (bytestream2_get_buffer(gb, frame, count) != count)
return AVERROR_INVALIDDATA;
frame += count;
}
return 0;
}
static int decode_blck(GetByteContext *gb, uint8_t *frame, int width, int height)
@ -304,11 +319,11 @@ typedef int (*chunk_decoder)(GetByteContext *gb, uint8_t *frame, int width, int
static const chunk_decoder decoder[8] = {
decode_copy, decode_tsw1, decode_bdlt, decode_wdlt,
decode_unk6, decode_dsw1, decode_blck, decode_dds1,
decode_tdlt, decode_dsw1, decode_blck, decode_dds1,
};
static const char* chunk_name[8] = {
"COPY", "TSW1", "BDLT", "WDLT", "????", "DSW1", "BLCK", "DDS1"
"COPY", "TSW1", "BDLT", "WDLT", "TDLT", "DSW1", "BLCK", "DDS1"
};
static int dfa_decode_frame(AVCodecContext *avctx,