* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- *
*/
/**
- * @file interplayvideo.c
+ * @file libavcodec/interplayvideo.c
* Interplay MVE Video Decoder by Mike Melanson (melanson@pcisys.net)
* For more information about the Interplay MVE format, visit:
* http://www.pcisys.net/~melanson/codecs/interplay-mve.txt
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
+#define ALT_BITSTREAM_READER_LE
+#include "get_bits.h"
#define PALETTE_COUNT 256
AVFrame second_last_frame;
AVFrame last_frame;
AVFrame current_frame;
- unsigned char *decoding_map;
+ const unsigned char *decoding_map;
int decoding_map_size;
- unsigned char *buf;
+ const unsigned char *buf;
int size;
- unsigned char *stream_ptr;
- unsigned char *stream_end;
+ const unsigned char *stream_ptr;
+ const unsigned char *stream_end;
unsigned char *pixel_ptr;
int line_inc;
int stride;
} IpvideoContext;
#define CHECK_STREAM_PTR(n) \
- if ((s->stream_ptr + n) > s->stream_end) { \
+ if (s->stream_end - s->stream_ptr < n) { \
av_log(s->avctx, AV_LOG_ERROR, "Interplay video warning: stream_ptr out of bounds (%p >= %p)\n", \
s->stream_ptr + n, s->stream_end); \
return -1; \
}
-#define COPY_FROM_CURRENT() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->current_frame.data[0] + motion_offset, s->stride, 8);
-
-#define COPY_FROM_PREVIOUS() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->last_frame.data[0] + motion_offset, s->stride, 8);
-
-#define COPY_FROM_SECOND_LAST() \
- motion_offset = current_offset; \
- motion_offset += y * s->stride; \
- motion_offset += x; \
- if (motion_offset < 0) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset); \
- return -1; \
- } else if (motion_offset > s->upper_motion_limit_offset) { \
- av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n", \
- motion_offset, s->upper_motion_limit_offset); \
- return -1; \
- } \
- s->dsp.put_pixels_tab[0][0](s->pixel_ptr, \
- s->second_last_frame.data[0] + motion_offset, s->stride, 8);
-
-static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
+static int copy_from(IpvideoContext *s, AVFrame *src, int delta_x, int delta_y)
{
- int x, y;
- int motion_offset;
int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy a block from the previous frame */
- x = y = 0;
- COPY_FROM_PREVIOUS();
-
- /* report success */
+ int motion_offset = current_offset + delta_y * s->stride + delta_x;
+ if (motion_offset < 0) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset < 0 (%d)\n", motion_offset);
+ return -1;
+ } else if (motion_offset > s->upper_motion_limit_offset) {
+ av_log(s->avctx, AV_LOG_ERROR, " Interplay video: motion offset above limit (%d >= %d)\n",
+ motion_offset, s->upper_motion_limit_offset);
+ return -1;
+ }
+ s->dsp.put_pixels_tab[1][0](s->pixel_ptr, src->data[0] + motion_offset, s->stride, 8);
return 0;
}
-static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
+static int ipvideo_decode_block_opcode_0x0(IpvideoContext *s)
{
- int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
-
- /* copy block from 2 frames ago */
- x = y = 0;
- COPY_FROM_SECOND_LAST();
+ return copy_from(s, &s->last_frame, 0, 0);
+}
- /* report success */
- return 0;
+static int ipvideo_decode_block_opcode_0x1(IpvideoContext *s)
+{
+ return copy_from(s, &s->second_last_frame, 0, 0);
}
static int ipvideo_decode_block_opcode_0x2(IpvideoContext *s)
{
unsigned char B;
int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
/* copy block from 2 frames ago using a motion vector; need 1 more byte */
CHECK_STREAM_PTR(1);
}
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_SECOND_LAST();
-
- /* report success */
- return 0;
+ return copy_from(s, &s->second_last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x3(IpvideoContext *s)
{
unsigned char B;
int x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
/* copy 8x8 block from current frame from an up/left block */
}
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_CURRENT();
-
- /* report success */
- return 0;
+ return copy_from(s, &s->current_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x4(IpvideoContext *s)
{
int x, y;
unsigned char B, BL, BH;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
/* copy a block from the previous frame; need 1 more byte */
CHECK_STREAM_PTR(1);
y = -8 + BH;
debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
- COPY_FROM_PREVIOUS();
-
- /* report success */
- return 0;
+ return copy_from(s, &s->last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x5(IpvideoContext *s)
{
signed char x, y;
- int motion_offset;
- int current_offset = s->pixel_ptr - s->current_frame.data[0];
/* copy a block from the previous frame using an expanded range;
* need 2 more bytes */
y = *s->stream_ptr++;
debug_interplay (" motion bytes = %d, %d\n", x, y);
- COPY_FROM_PREVIOUS();
-
- /* report success */
- return 0;
+ return copy_from(s, &s->last_frame, x, y);
}
static int ipvideo_decode_block_opcode_0x6(IpvideoContext *s)
static int ipvideo_decode_block_opcode_0x7(IpvideoContext *s)
{
int x, y;
- unsigned char P0, P1;
- unsigned char B[8];
+ unsigned char P[2];
unsigned int flags;
- int bitmask;
/* 2-color encoding */
CHECK_STREAM_PTR(2);
- P0 = *s->stream_ptr++;
- P1 = *s->stream_ptr++;
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
- if (P0 <= P1) {
+ if (P[0] <= P[1]) {
/* need 8 more bytes from the stream */
CHECK_STREAM_PTR(8);
- for (y = 0; y < 8; y++)
- B[y] = *s->stream_ptr++;
for (y = 0; y < 8; y++) {
- flags = B[y];
- for (x = 0x01; x <= 0x80; x <<= 1) {
- if (flags & x)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
+ flags = *s->stream_ptr++ | 0x100;
+ for (; flags != 1; flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->line_inc;
}
CHECK_STREAM_PTR(2);
flags = bytestream_get_le16(&s->stream_ptr);
- bitmask = 0x0001;
for (y = 0; y < 8; y += 2) {
- for (x = 0; x < 8; x += 2, bitmask <<= 1) {
- if (flags & bitmask) {
- *(s->pixel_ptr + x) = P1;
- *(s->pixel_ptr + x + 1) = P1;
- *(s->pixel_ptr + s->stride + x) = P1;
- *(s->pixel_ptr + s->stride + x + 1) = P1;
- } else {
- *(s->pixel_ptr + x) = P0;
- *(s->pixel_ptr + x + 1) = P0;
- *(s->pixel_ptr + s->stride + x) = P0;
- *(s->pixel_ptr + s->stride + x + 1) = P0;
- }
+ for (x = 0; x < 8; x += 2, flags >>= 1) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = P[flags & 1];
}
s->pixel_ptr += s->stride * 2;
}
static int ipvideo_decode_block_opcode_0x8(IpvideoContext *s)
{
int x, y;
- unsigned char P[8];
- unsigned char B[8];
+ unsigned char P[2];
unsigned int flags = 0;
- unsigned int bitmask = 0;
- unsigned char P0 = 0, P1 = 0;
- int lower_half = 0;
/* 2-color encoding for each 4x4 quadrant, or 2-color encoding on
* either top and bottom or left and right halves */
if (P[0] <= P[1]) {
- /* need 12 more bytes */
- CHECK_STREAM_PTR(12);
- B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
- P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
- B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
- P[4] = *s->stream_ptr++; P[5] = *s->stream_ptr++;
- B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
- P[6] = *s->stream_ptr++; P[7] = *s->stream_ptr++;
- B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
+ CHECK_STREAM_PTR(14);
+ s->stream_ptr -= 2;
- for (y = 0; y < 8; y++) {
-
- /* time to reload flags? */
- if (y == 0) {
- flags =
- ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
- ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
- ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
- ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
- bitmask = 0x00000001;
- lower_half = 0; /* still on top half */
- } else if (y == 4) {
- flags =
- ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
- ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
- ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
- ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
- bitmask = 0x00000001;
- lower_half = 2;
+ for (y = 0; y < 16; y++) {
+ // new values for each 4x4 block
+ if (!(y & 3)) {
+ P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
+ flags = bytestream_get_le16(&s->stream_ptr);
}
- for (x = 0; x < 8; x++, bitmask <<= 1) {
- /* get the pixel values ready for this quadrant */
- if (x == 0) {
- P0 = P[lower_half + 0];
- P1 = P[lower_half + 1];
- } else if (x == 4) {
- P0 = P[lower_half + 4];
- P1 = P[lower_half + 5];
- }
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
- s->pixel_ptr += s->line_inc;
+ for (x = 0; x < 4; x++, flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
}
} else {
/* need 10 more bytes */
CHECK_STREAM_PTR(10);
- B[0] = *s->stream_ptr++; B[1] = *s->stream_ptr++;
- B[2] = *s->stream_ptr++; B[3] = *s->stream_ptr++;
- P[2] = *s->stream_ptr++; P[3] = *s->stream_ptr++;
- B[4] = *s->stream_ptr++; B[5] = *s->stream_ptr++;
- B[6] = *s->stream_ptr++; B[7] = *s->stream_ptr++;
-
- if (P[2] <= P[3]) {
- /* vertical split; left & right halves are 2-color encoded */
+ if (s->stream_ptr[4] <= s->stream_ptr[5]) {
- for (y = 0; y < 8; y++) {
+ flags = bytestream_get_le32(&s->stream_ptr);
- /* time to reload flags? */
- if (y == 0) {
- flags =
- ((B[0] & 0xF0) << 4) | ((B[4] & 0xF0) << 8) |
- ((B[0] & 0x0F) ) | ((B[4] & 0x0F) << 4) |
- ((B[1] & 0xF0) << 20) | ((B[5] & 0xF0) << 24) |
- ((B[1] & 0x0F) << 16) | ((B[5] & 0x0F) << 20);
- bitmask = 0x00000001;
- } else if (y == 4) {
- flags =
- ((B[2] & 0xF0) << 4) | ((B[6] & 0xF0) << 8) |
- ((B[2] & 0x0F) ) | ((B[6] & 0x0F) << 4) |
- ((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
- ((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
- bitmask = 0x00000001;
- }
+ /* vertical split; left & right halves are 2-color encoded */
- for (x = 0; x < 8; x++, bitmask <<= 1) {
- /* get the pixel values ready for this half */
- if (x == 0) {
- P0 = P[0];
- P1 = P[1];
- } else if (x == 4) {
- P0 = P[2];
- P1 = P[3];
- }
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
+ for (y = 0; y < 16; y++) {
+ for (x = 0; x < 4; x++, flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) {
+ s->pixel_ptr -= 8 * s->stride - 4;
+ P[0] = *s->stream_ptr++; P[1] = *s->stream_ptr++;
+ flags = bytestream_get_le32(&s->stream_ptr);
}
- s->pixel_ptr += s->line_inc;
}
} else {
/* horizontal split; top & bottom halves are 2-color encoded */
for (y = 0; y < 8; y++) {
-
- flags = B[y];
- if (y == 0) {
- P0 = P[0];
- P1 = P[1];
- } else if (y == 4) {
- P0 = P[2];
- P1 = P[3];
+ if (y == 4) {
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
}
+ flags = *s->stream_ptr++ | 0x100;
- for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {
-
- if (flags & bitmask)
- *s->pixel_ptr++ = P1;
- else
- *s->pixel_ptr++ = P0;
- }
+ for (; flags != 1; flags >>= 1)
+ *s->pixel_ptr++ = P[flags & 1];
s->pixel_ptr += s->line_inc;
}
}
{
int x, y;
unsigned char P[4];
- unsigned int flags = 0;
- int shifter = 0;
- unsigned char pix;
/* 4-color encoding */
CHECK_STREAM_PTR(4);
- for (y = 0; y < 4; y++)
- P[y] = *s->stream_ptr++;
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
- if ((P[0] <= P[1]) && (P[2] <= P[3])) {
+ if (P[0] <= P[1]) {
+ if (P[2] <= P[3]) {
- /* 1 of 4 colors for each pixel, need 16 more bytes */
- CHECK_STREAM_PTR(16);
+ /* 1 of 4 colors for each pixel, need 16 more bytes */
+ CHECK_STREAM_PTR(16);
- for (y = 0; y < 8; y++) {
- /* get the next set of 8 2-bit flags */
- flags = bytestream_get_le16(&s->stream_ptr);
- for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
- *s->pixel_ptr++ = P[(flags >> shifter) & 0x03];
+ for (y = 0; y < 8; y++) {
+ /* get the next set of 8 2-bit flags */
+ int flags = bytestream_get_le16(&s->stream_ptr);
+ for (x = 0; x < 8; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
+ s->pixel_ptr += s->line_inc;
}
- s->pixel_ptr += s->line_inc;
- }
- } else if ((P[0] <= P[1]) && (P[2] > P[3])) {
+ } else {
+ uint32_t flags;
- /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
- CHECK_STREAM_PTR(4);
+ /* 1 of 4 colors for each 2x2 block, need 4 more bytes */
+ CHECK_STREAM_PTR(4);
- flags = bytestream_get_le32(&s->stream_ptr);
- shifter = 0;
+ flags = bytestream_get_le32(&s->stream_ptr);
- for (y = 0; y < 8; y += 2) {
- for (x = 0; x < 8; x += 2, shifter += 2) {
- pix = P[(flags >> shifter) & 0x03];
- *(s->pixel_ptr + x) = pix;
- *(s->pixel_ptr + x + 1) = pix;
- *(s->pixel_ptr + s->stride + x) = pix;
- *(s->pixel_ptr + s->stride + x + 1) = pix;
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x += 2, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride * 2;
}
- s->pixel_ptr += s->stride * 2;
- }
-
- } else if ((P[0] > P[1]) && (P[2] <= P[3])) {
-
- /* 1 of 4 colors for each 2x1 block, need 8 more bytes */
- CHECK_STREAM_PTR(8);
- for (y = 0; y < 8; y++) {
- /* time to reload flags? */
- if ((y == 0) || (y == 4)) {
- flags = bytestream_get_le32(&s->stream_ptr);
- shifter = 0;
- }
- for (x = 0; x < 8; x += 2, shifter += 2) {
- pix = P[(flags >> shifter) & 0x03];
- *(s->pixel_ptr + x) = pix;
- *(s->pixel_ptr + x + 1) = pix;
- }
- s->pixel_ptr += s->stride;
}
-
} else {
+ uint64_t flags;
- /* 1 of 4 colors for each 1x2 block, need 8 more bytes */
+ /* 1 of 4 colors for each 2x1 or 1x2 block, need 8 more bytes */
CHECK_STREAM_PTR(8);
- for (y = 0; y < 8; y += 2) {
- /* time to reload flags? */
- if ((y == 0) || (y == 4)) {
- flags = bytestream_get_le32(&s->stream_ptr);
- shifter = 0;
+ flags = bytestream_get_le64(&s->stream_ptr);
+ if (P[2] <= P[3]) {
+ for (y = 0; y < 8; y++) {
+ for (x = 0; x < 8; x += 2, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride;
}
- for (x = 0; x < 8; x++, shifter += 2) {
- pix = P[(flags >> shifter) & 0x03];
- *(s->pixel_ptr + x) = pix;
- *(s->pixel_ptr + s->stride + x) = pix;
+ } else {
+ for (y = 0; y < 8; y += 2) {
+ for (x = 0; x < 8; x++, flags >>= 2) {
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + s->stride] = P[flags & 0x03];
+ }
+ s->pixel_ptr += s->stride * 2;
}
- s->pixel_ptr += s->stride * 2;
}
}
static int ipvideo_decode_block_opcode_0xA(IpvideoContext *s)
{
int x, y;
- unsigned char P[16];
- unsigned char B[16];
+ unsigned char P[4];
int flags = 0;
- int shifter = 0;
- int index;
- int split;
- int lower_half;
/* 4-color encoding for each 4x4 quadrant, or 4-color encoding on
* either top and bottom or left and right halves */
- CHECK_STREAM_PTR(4);
-
- for (y = 0; y < 4; y++)
- P[y] = *s->stream_ptr++;
+ CHECK_STREAM_PTR(24);
- if (P[0] <= P[1]) {
-
- /* 4-color encoding for each quadrant; need 28 more bytes */
- CHECK_STREAM_PTR(28);
-
- for (y = 0; y < 4; y++)
- B[y] = *s->stream_ptr++;
- for (y = 4; y < 16; y += 4) {
- for (x = y; x < y + 4; x++)
- P[x] = *s->stream_ptr++;
- for (x = y; x < y + 4; x++)
- B[x] = *s->stream_ptr++;
- }
+ if (s->stream_ptr[0] <= s->stream_ptr[1]) {
- for (y = 0; y < 8; y++) {
-
- lower_half = (y >= 4) ? 4 : 0;
- flags = (B[y + 8] << 8) | B[y];
+ /* 4-color encoding for each quadrant; need 32 bytes */
+ CHECK_STREAM_PTR(32);
- for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
- split = (x >= 4) ? 8 : 0;
- index = split + lower_half + ((flags >> shifter) & 0x03);
- *s->pixel_ptr++ = P[index];
+ for (y = 0; y < 16; y++) {
+ // new values for each 4x4 block
+ if (!(y & 3)) {
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
+ flags = bytestream_get_le32(&s->stream_ptr);
}
- s->pixel_ptr += s->line_inc;
+ for (x = 0; x < 4; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
+
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
}
} else {
+ // vertical split?
+ int vert = s->stream_ptr[12] <= s->stream_ptr[13];
+ uint64_t flags = 0;
/* 4-color encoding for either left and right or top and bottom
- * halves; need 20 more bytes */
- CHECK_STREAM_PTR(20);
-
- for (y = 0; y < 8; y++)
- B[y] = *s->stream_ptr++;
- for (y = 4; y < 8; y++)
- P[y] = *s->stream_ptr++;
- for (y = 8; y < 16; y++)
- B[y] = *s->stream_ptr++;
-
- if (P[4] <= P[5]) {
-
- /* block is divided into left and right halves */
- for (y = 0; y < 8; y++) {
-
- flags = (B[y + 8] << 8) | B[y];
- split = 0;
-
- for (x = 0, shifter = 0; x < 8; x++, shifter += 2) {
- if (x == 4)
- split = 4;
- *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
- }
-
- s->pixel_ptr += s->line_inc;
+ * halves */
+
+ for (y = 0; y < 16; y++) {
+ // load values for each half
+ if (!(y & 7)) {
+ memcpy(P, s->stream_ptr, 4);
+ s->stream_ptr += 4;
+ flags = bytestream_get_le64(&s->stream_ptr);
}
- } else {
-
- /* block is divided into top and bottom halves */
- split = 0;
- for (y = 0; y < 8; y++) {
-
- flags = (B[y * 2 + 1] << 8) | B[y * 2];
- if (y == 4)
- split = 4;
+ for (x = 0; x < 4; x++, flags >>= 2)
+ *s->pixel_ptr++ = P[flags & 0x03];
- for (x = 0, shifter = 0; x < 8; x++, shifter += 2)
- *s->pixel_ptr++ = P[split + ((flags >> shifter) & 0x03)];
-
- s->pixel_ptr += s->line_inc;
- }
+ if (vert) {
+ s->pixel_ptr += s->stride - 4;
+ // switch to right half
+ if (y == 7) s->pixel_ptr -= 8 * s->stride - 4;
+ } else if (y & 1) s->pixel_ptr += s->line_inc;
}
}
static int ipvideo_decode_block_opcode_0xB(IpvideoContext *s)
{
- int x, y;
+ int y;
/* 64-color encoding (each pixel in block is a different color) */
CHECK_STREAM_PTR(64);
for (y = 0; y < 8; y++) {
- for (x = 0; x < 8; x++) {
- *s->pixel_ptr++ = *s->stream_ptr++;
- }
- s->pixel_ptr += s->line_inc;
+ memcpy(s->pixel_ptr, s->stream_ptr, 8);
+ s->stream_ptr += 8;
+ s->pixel_ptr += s->stride;
}
/* report success */
static int ipvideo_decode_block_opcode_0xC(IpvideoContext *s)
{
int x, y;
- unsigned char pix;
/* 16-color block encoding: each 2x2 block is a different color */
CHECK_STREAM_PTR(16);
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2) {
- pix = *s->stream_ptr++;
- *(s->pixel_ptr + x) = pix;
- *(s->pixel_ptr + x + 1) = pix;
- *(s->pixel_ptr + s->stride + x) = pix;
- *(s->pixel_ptr + s->stride + x + 1) = pix;
+ s->pixel_ptr[x ] =
+ s->pixel_ptr[x + 1 ] =
+ s->pixel_ptr[x + s->stride] =
+ s->pixel_ptr[x + 1 + s->stride] = *s->stream_ptr++;
}
s->pixel_ptr += s->stride * 2;
}
static int ipvideo_decode_block_opcode_0xD(IpvideoContext *s)
{
- int x, y;
- unsigned char P[4];
- unsigned char index = 0;
+ int y;
+ unsigned char P[2];
/* 4-color block encoding: each 4x4 block is a different color */
CHECK_STREAM_PTR(4);
- for (y = 0; y < 4; y++)
- P[y] = *s->stream_ptr++;
-
for (y = 0; y < 8; y++) {
- if (y < 4)
- index = 0;
- else
- index = 2;
-
- for (x = 0; x < 8; x++) {
- if (x == 4)
- index++;
- *s->pixel_ptr++ = P[index];
+ if (!(y & 3)) {
+ P[0] = *s->stream_ptr++;
+ P[1] = *s->stream_ptr++;
}
- s->pixel_ptr += s->line_inc;
+ memset(s->pixel_ptr, P[0], 4);
+ memset(s->pixel_ptr + 4, P[1], 4);
+ s->pixel_ptr += s->stride;
}
/* report success */
static int ipvideo_decode_block_opcode_0xE(IpvideoContext *s)
{
- int x, y;
+ int y;
unsigned char pix;
/* 1-color encoding: the whole block is 1 solid color */
pix = *s->stream_ptr++;
for (y = 0; y < 8; y++) {
- for (x = 0; x < 8; x++) {
- *s->pixel_ptr++ = pix;
- }
- s->pixel_ptr += s->line_inc;
+ memset(s->pixel_ptr, pix, 8);
+ s->pixel_ptr += s->stride;
}
/* report success */
static int ipvideo_decode_block_opcode_0xF(IpvideoContext *s)
{
int x, y;
- unsigned char sample0, sample1;
+ unsigned char sample[2];
/* dithered encoding */
CHECK_STREAM_PTR(2);
- sample0 = *s->stream_ptr++;
- sample1 = *s->stream_ptr++;
+ sample[0] = *s->stream_ptr++;
+ sample[1] = *s->stream_ptr++;
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x += 2) {
- if (y & 1) {
- *s->pixel_ptr++ = sample1;
- *s->pixel_ptr++ = sample0;
- } else {
- *s->pixel_ptr++ = sample0;
- *s->pixel_ptr++ = sample1;
- }
+ *s->pixel_ptr++ = sample[ y & 1 ];
+ *s->pixel_ptr++ = sample[!(y & 1)];
}
s->pixel_ptr += s->line_inc;
}
return 0;
}
-static int (*ipvideo_decode_block[16])(IpvideoContext *s);
+static int (* const ipvideo_decode_block[])(IpvideoContext *s) = {
+ ipvideo_decode_block_opcode_0x0, ipvideo_decode_block_opcode_0x1,
+ ipvideo_decode_block_opcode_0x2, ipvideo_decode_block_opcode_0x3,
+ ipvideo_decode_block_opcode_0x4, ipvideo_decode_block_opcode_0x5,
+ ipvideo_decode_block_opcode_0x6, ipvideo_decode_block_opcode_0x7,
+ ipvideo_decode_block_opcode_0x8, ipvideo_decode_block_opcode_0x9,
+ ipvideo_decode_block_opcode_0xA, ipvideo_decode_block_opcode_0xB,
+ ipvideo_decode_block_opcode_0xC, ipvideo_decode_block_opcode_0xD,
+ ipvideo_decode_block_opcode_0xE, ipvideo_decode_block_opcode_0xF,
+};
static void ipvideo_decode_opcodes(IpvideoContext *s)
{
int x, y;
- int index = 0;
unsigned char opcode;
int ret;
- int code_counts[16];
static int frame = 0;
+ GetBitContext gb;
debug_interplay("------------------ frame %d\n", frame);
frame++;
- for (x = 0; x < 16; x++)
- code_counts[x] = 0;
-
/* this is PAL8, so make the palette available */
memcpy(s->current_frame.data[1], s->avctx->palctrl->palette, PALETTE_COUNT * 4);
s->line_inc = s->stride - 8;
s->upper_motion_limit_offset = (s->avctx->height - 8) * s->stride
+ s->avctx->width - 8;
- s->dsp = s->dsp;
+ init_get_bits(&gb, s->decoding_map, s->decoding_map_size * 8);
for (y = 0; y < (s->stride * s->avctx->height); y += s->stride * 8) {
for (x = y; x < y + s->avctx->width; x += 8) {
- /* bottom nibble first, then top nibble (which makes it
- * hard to use a GetBitcontext) */
- if (index & 1)
- opcode = s->decoding_map[index >> 1] >> 4;
- else
- opcode = s->decoding_map[index >> 1] & 0xF;
- index++;
+ opcode = get_bits(&gb, 4);
debug_interplay(" block @ (%3d, %3d): encoding 0x%X, data ptr @ %p\n",
x - y, y / s->stride, opcode, s->stream_ptr);
- code_counts[opcode]++;
s->pixel_ptr = s->current_frame.data[0] + x;
ret = ipvideo_decode_block[opcode](s);
}
}
}
- if ((s->stream_ptr != s->stream_end) &&
- (s->stream_ptr + 1 != s->stream_end)) {
+ if (s->stream_end - s->stream_ptr > 1) {
av_log(s->avctx, AV_LOG_ERROR, " Interplay video: decode finished with %td bytes left over\n",
s->stream_end - s->stream_ptr);
}
}
-static int ipvideo_decode_init(AVCodecContext *avctx)
+static av_cold int ipvideo_decode_init(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
/* decoding map contains 4 bits of information per 8x8 block */
s->decoding_map_size = avctx->width * avctx->height / (8 * 8 * 2);
- /* assign block decode functions */
- ipvideo_decode_block[0x0] = ipvideo_decode_block_opcode_0x0;
- ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x1;
- ipvideo_decode_block[0x2] = ipvideo_decode_block_opcode_0x2;
- ipvideo_decode_block[0x3] = ipvideo_decode_block_opcode_0x3;
- ipvideo_decode_block[0x4] = ipvideo_decode_block_opcode_0x4;
- ipvideo_decode_block[0x5] = ipvideo_decode_block_opcode_0x5;
- ipvideo_decode_block[0x6] = ipvideo_decode_block_opcode_0x6;
- ipvideo_decode_block[0x7] = ipvideo_decode_block_opcode_0x7;
- ipvideo_decode_block[0x8] = ipvideo_decode_block_opcode_0x8;
- ipvideo_decode_block[0x9] = ipvideo_decode_block_opcode_0x9;
- ipvideo_decode_block[0xA] = ipvideo_decode_block_opcode_0xA;
- ipvideo_decode_block[0xB] = ipvideo_decode_block_opcode_0xB;
- ipvideo_decode_block[0xC] = ipvideo_decode_block_opcode_0xC;
- ipvideo_decode_block[0xD] = ipvideo_decode_block_opcode_0xD;
- ipvideo_decode_block[0xE] = ipvideo_decode_block_opcode_0xE;
- ipvideo_decode_block[0xF] = ipvideo_decode_block_opcode_0xF;
-
s->current_frame.data[0] = s->last_frame.data[0] =
s->second_last_frame.data[0] = NULL;
static int ipvideo_decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ AVPacket *avpkt)
{
+ const uint8_t *buf = avpkt->data;
+ int buf_size = avpkt->size;
IpvideoContext *s = avctx->priv_data;
AVPaletteControl *palette_control = avctx->palctrl;
return buf_size;
}
-static int ipvideo_decode_end(AVCodecContext *avctx)
+static av_cold int ipvideo_decode_end(AVCodecContext *avctx)
{
IpvideoContext *s = avctx->priv_data;
ipvideo_decode_end,
ipvideo_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Interplay MVE video"),
};