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FFmpeg
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video looks beautiful now, many thanks to Alexander Belyakov 

<abel at krasu.ru> for squishing bunches of bugs

Originally committed as revision 2290 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Mike Melanson 22 years ago
parent
7581685205
commit
d86e8568e6
1 changed files with 67 additions and 32 deletions
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  1. +67
    -32
      libavcodec/interplayvideo.c

+ 67
- 32
libavcodec/interplayvideo.c View File

@@ -56,9 +56,9 @@ typedef struct IpvideoContext {

AVCodecContext *avctx;
DSPContext dsp;
AVFrame second_last_frame;
AVFrame last_frame;
AVFrame current_frame;
int first_frame;
unsigned char *decoding_map;
int decoding_map_size;

@@ -105,12 +105,13 @@ static unsigned char *sg_stream_end;
static unsigned char *sg_current_plane;
static unsigned char *sg_output_plane;
static unsigned char *sg_last_plane;
static unsigned char *sg_second_last_plane;
static int sg_line_inc;
static int sg_stride;
static int sg_upper_motion_limit_offset;
static DSPContext sg_dsp;

static int ipvideo_decode_block_opcode_0x0_0x1(void)
static int ipvideo_decode_block_opcode_0x0(void)
{
int x, y;
unsigned char *src_block;
@@ -129,6 +130,25 @@ static int ipvideo_decode_block_opcode_0x0_0x1(void)
return 0;
}

static int ipvideo_decode_block_opcode_0x1(void)
{
int x, y;
unsigned char *src_block;

/* copy block from two frames behind */
src_block = sg_second_last_plane + (sg_output_plane - sg_current_plane);
for (y = 0; y < 8; y++) {
for (x = 0; x < 8; x++) {
*sg_output_plane++ = *src_block++;
}
sg_output_plane += sg_line_inc;
src_block += sg_line_inc;
}

/* report success */
return 0;
}

#define COPY_FROM_CURRENT() \
motion_offset = current_offset; \
motion_offset += y * sg_stride; \
@@ -159,6 +179,21 @@ static int ipvideo_decode_block_opcode_0x0_0x1(void)
sg_dsp.put_pixels_tab[0][0](sg_output_plane, \
sg_last_plane + motion_offset, sg_stride, 8);

#define COPY_FROM_SECOND_LAST() \
motion_offset = current_offset; \
motion_offset += y * sg_stride; \
motion_offset += x; \
if (motion_offset < 0) { \
printf (" Interplay video: motion offset < 0 (%d)\n", motion_offset); \
return -1; \
} else if (motion_offset > sg_upper_motion_limit_offset) { \
printf (" Interplay video: motion offset above limit (%d >= %d)\n", \
motion_offset, sg_upper_motion_limit_offset); \
return -1; \
} \
sg_dsp.put_pixels_tab[0][0](sg_output_plane, \
sg_second_last_plane + motion_offset, sg_stride, 8);

static int ipvideo_decode_block_opcode_0x2(void)
{
unsigned char B;
@@ -166,10 +201,6 @@ static int ipvideo_decode_block_opcode_0x2(void)
int motion_offset;
int current_offset = sg_output_plane - sg_current_plane;

/* This is the opcode which claims to copy data from within the same
* frame at a coordinate which has not been rendered yet. Assume that
* it is supposed to be copied from the previous frame. */

/* need 1 more byte for motion */
CHECK_STREAM_PTR(1);
B = *sg_stream_ptr++;
@@ -183,7 +214,7 @@ static int ipvideo_decode_block_opcode_0x2(void)
}

debug_interplay (" motion byte = %d, (x, y) = (%d, %d)\n", B, x, y);
COPY_FROM_PREVIOUS();
COPY_FROM_SECOND_LAST();

/* report success */
return 0;
@@ -313,15 +344,15 @@ static int ipvideo_decode_block_opcode_0x7(void)
for (y = 0; y < 8; y += 2) {
for (x = 0; x < 8; x += 2, bitmask <<= 1) {
if (flags & bitmask) {
*(sg_output_plane + x) = P0;
*(sg_output_plane + x + 1) = P0;
*(sg_output_plane + sg_stride + x) = P0;
*(sg_output_plane + sg_stride + x + 1) = P0;
} else {
*(sg_output_plane + x) = P1;
*(sg_output_plane + x + 1) = P1;
*(sg_output_plane + sg_stride + x) = P1;
*(sg_output_plane + sg_stride + x + 1) = P1;
} else {
*(sg_output_plane + x) = P0;
*(sg_output_plane + x + 1) = P0;
*(sg_output_plane + sg_stride + x) = P0;
*(sg_output_plane + sg_stride + x + 1) = P0;
}
}
sg_output_plane += sg_stride * 2;
@@ -379,7 +410,7 @@ static int ipvideo_decode_block_opcode_0x8(void)
((B[3] & 0xF0) << 20) | ((B[7] & 0xF0) << 24) |
((B[3] & 0x0F) << 16) | ((B[7] & 0x0F) << 20);
bitmask = 0x00000001;
lower_half = 4;
lower_half = 2;
}

for (x = 0; x < 8; x++, bitmask <<= 1) {
@@ -388,8 +419,8 @@ static int ipvideo_decode_block_opcode_0x8(void)
P0 = P[lower_half + 0];
P1 = P[lower_half + 1];
} else if (x == 4) {
P0 = P[lower_half + 2];
P1 = P[lower_half + 3];
P0 = P[lower_half + 4];
P1 = P[lower_half + 5];
}

if (flags & bitmask)
@@ -444,9 +475,9 @@ static int ipvideo_decode_block_opcode_0x8(void)
}

if (flags & bitmask)
*sg_output_plane++ = P0;
else
*sg_output_plane++ = P1;
else
*sg_output_plane++ = P0;
}
sg_output_plane += sg_line_inc;
}
@@ -469,9 +500,9 @@ static int ipvideo_decode_block_opcode_0x8(void)
for (bitmask = 0x01; bitmask <= 0x80; bitmask <<= 1) {

if (flags & bitmask)
*sg_output_plane++ = P0;
else
*sg_output_plane++ = P1;
else
*sg_output_plane++ = P0;
}
sg_output_plane += sg_line_inc;
}
@@ -832,6 +863,7 @@ static void ipvideo_decode_opcodes(IpvideoContext *s)
sg_line_inc = sg_stride - 8;
sg_current_plane = s->current_frame.data[0];
sg_last_plane = s->last_frame.data[0];
sg_second_last_plane = s->second_last_frame.data[0];
sg_upper_motion_limit_offset = (s->avctx->height - 8) * sg_stride
+ s->avctx->width - 8;
sg_dsp = s->dsp;
@@ -889,14 +921,12 @@ static int ipvideo_decode_init(AVCodecContext *avctx)
avctx->has_b_frames = 0;
dsputil_init(&s->dsp, avctx);

s->first_frame = 1;

/* 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_0x1;
ipvideo_decode_block[0x1] = ipvideo_decode_block_opcode_0x0_0x1;
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;
@@ -912,6 +942,9 @@ static int ipvideo_decode_init(AVCodecContext *avctx)
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;

return 0;
}

@@ -932,6 +965,7 @@ static int ipvideo_decode_frame(AVCodecContext *avctx,
s->buf = buf + s->decoding_map_size;
s->size = buf_size - s->decoding_map_size;

s->current_frame.reference = 3;
if (avctx->get_buffer(avctx, &s->current_frame)) {
printf (" Interplay Video: get_buffer() failed\n");
return -1;
@@ -939,17 +973,15 @@ static int ipvideo_decode_frame(AVCodecContext *avctx,

ipvideo_decode_opcodes(s);

/* release the last frame if it is allocated */
if (s->first_frame)
s->first_frame = 0;
else
avctx->release_buffer(avctx, &s->last_frame);
*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->current_frame;

/* shuffle frames */
if (s->second_last_frame.data[0])
avctx->release_buffer(avctx, &s->second_last_frame);
s->second_last_frame = s->last_frame;
s->last_frame = s->current_frame;

*data_size = sizeof(AVFrame);
*(AVFrame*)data = s->current_frame;
s->current_frame.data[0] = NULL; /* catch any access attempts */

/* report that the buffer was completely consumed */
return buf_size;
@@ -960,7 +992,10 @@ static int ipvideo_decode_end(AVCodecContext *avctx)
IpvideoContext *s = avctx->priv_data;

/* release the last frame */
avctx->release_buffer(avctx, &s->last_frame);
if (s->last_frame.data[0])
avctx->release_buffer(avctx, &s->last_frame);
if (s->second_last_frame.data[0])
avctx->release_buffer(avctx, &s->second_last_frame);

return 0;
}


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