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@ -66,16 +66,18 @@ typedef struct VmdVideoContext { |
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unsigned char palette[PALETTE_COUNT * 4]; |
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unsigned char *unpack_buffer; |
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int unpack_buffer_size; |
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} VmdVideoContext; |
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#define QUEUE_SIZE 0x1000 |
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#define QUEUE_MASK 0x0FFF |
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static void lz_unpack(unsigned char *src, unsigned char *dest) |
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static void lz_unpack(unsigned char *src, unsigned char *dest, int dest_len) |
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{ |
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unsigned char *s; |
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unsigned char *d; |
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unsigned char *d_end; |
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unsigned char queue[QUEUE_SIZE]; |
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unsigned int qpos; |
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unsigned int dataleft; |
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@ -87,6 +89,7 @@ static void lz_unpack(unsigned char *src, unsigned char *dest) |
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s = src; |
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d = dest; |
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d_end = d + dest_len; |
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dataleft = LE_32(s); |
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s += 4; |
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memset(queue, QUEUE_SIZE, 0x20); |
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@ -102,6 +105,8 @@ static void lz_unpack(unsigned char *src, unsigned char *dest) |
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while (dataleft > 0) { |
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tag = *s++; |
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if ((tag == 0xFF) && (dataleft > 8)) { |
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if (d + 8 > d_end) |
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return; |
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for (i = 0; i < 8; i++) { |
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queue[qpos++] = *d++ = *s++; |
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qpos &= QUEUE_MASK; |
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@ -112,6 +117,8 @@ static void lz_unpack(unsigned char *src, unsigned char *dest) |
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if (dataleft == 0) |
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break; |
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if (tag & 0x01) { |
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if (d + 1 > d_end) |
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return; |
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queue[qpos++] = *d++ = *s++; |
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qpos &= QUEUE_MASK; |
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dataleft--; |
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@ -121,6 +128,8 @@ static void lz_unpack(unsigned char *src, unsigned char *dest) |
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chainlen = (*s++ & 0x0F) + 3; |
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if (chainlen == speclen) |
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chainlen = *s++ + 0xF + 3; |
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if (d + chainlen > d_end) |
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return; |
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for (j = 0; j < chainlen; j++) { |
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*d = queue[chainofs++ & QUEUE_MASK]; |
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queue[qpos++] = *d++; |
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@ -134,27 +143,33 @@ static void lz_unpack(unsigned char *src, unsigned char *dest) |
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} |
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} |
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static int rle_unpack(unsigned char *src, unsigned char *dest, int len) |
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static int rle_unpack(unsigned char *src, unsigned char *dest,
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int src_len, int dest_len) |
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{ |
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unsigned char *ps; |
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unsigned char *pd; |
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int i, l; |
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unsigned char *dest_end = dest + dest_len; |
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ps = src; |
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pd = dest; |
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if (len & 1) |
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if (src_len & 1) |
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*pd++ = *ps++; |
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len >>= 1; |
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src_len >>= 1; |
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i = 0; |
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do { |
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l = *ps++; |
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if (l & 0x80) { |
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l = (l & 0x7F) * 2; |
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if (pd + l > dest_end) |
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return (ps - src); |
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memcpy(pd, ps, l); |
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ps += l; |
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pd += l; |
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} else { |
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if (pd + i > dest_end) |
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return (ps - src); |
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for (i = 0; i < l; i++) { |
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*pd++ = ps[0]; |
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*pd++ = ps[1]; |
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@ -162,7 +177,7 @@ static int rle_unpack(unsigned char *src, unsigned char *dest, int len) |
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ps += 2; |
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} |
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i += l; |
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} while (i < len); |
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} while (i < src_len); |
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return (ps - src); |
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} |
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@ -185,6 +200,7 @@ static void vmd_decode(VmdVideoContext *s) |
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int frame_x, frame_y; |
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int frame_width, frame_height; |
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int dp_size; |
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frame_x = LE_16(&s->buf[6]); |
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frame_y = LE_16(&s->buf[8]); |
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@ -217,12 +233,13 @@ static void vmd_decode(VmdVideoContext *s) |
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pb = p; |
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meth = *pb++; |
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if (meth & 0x80) { |
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lz_unpack(pb, s->unpack_buffer); |
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lz_unpack(pb, s->unpack_buffer, s->unpack_buffer_size); |
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meth &= 0x7F; |
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pb = s->unpack_buffer; |
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} |
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dp = &s->frame.data[0][frame_y * s->frame.linesize[0] + frame_x]; |
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dp_size = s->frame.linesize[0] * s->avctx->height; |
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pp = &s->prev_frame.data[0][frame_y * s->prev_frame.linesize[0] + frame_x]; |
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switch (meth) { |
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case 1: |
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@ -232,11 +249,15 @@ static void vmd_decode(VmdVideoContext *s) |
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len = *pb++; |
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if (len & 0x80) { |
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len = (len & 0x7F) + 1; |
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if (ofs + len > frame_width) |
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return; |
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memcpy(&dp[ofs], pb, len); |
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pb += len; |
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ofs += len; |
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} else { |
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/* interframe pixel copy */ |
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if (ofs + len + 1 > frame_width) |
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return; |
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memcpy(&dp[ofs], &pp[ofs], len + 1); |
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ofs += len + 1; |
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} |
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@ -268,13 +289,15 @@ static void vmd_decode(VmdVideoContext *s) |
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if (len & 0x80) { |
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len = (len & 0x7F) + 1; |
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if (*pb++ == 0xFF) |
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len = rle_unpack(pb, &dp[ofs], len); |
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len = rle_unpack(pb, &dp[ofs], len, frame_width - ofs); |
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else |
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memcpy(&dp[ofs], pb, len); |
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pb += len; |
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ofs += len; |
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} else { |
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/* interframe pixel copy */ |
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if (ofs + len + 1 > frame_width) |
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return; |
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memcpy(&dp[ofs], &pp[ofs], len + 1); |
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ofs += len + 1; |
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} |
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@ -314,7 +337,8 @@ static int vmdvideo_decode_init(AVCodecContext *avctx) |
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} |
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vmd_header = (unsigned char *)avctx->extradata; |
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s->unpack_buffer = av_malloc(LE_32(&vmd_header[800])); |
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s->unpack_buffer_size = LE_32(&vmd_header[800]); |
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s->unpack_buffer = av_malloc(s->unpack_buffer_size); |
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if (!s->unpack_buffer) |
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return -1; |
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