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FFmpeg
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fix progressive jpeg: 

support refinement passes
remove intermediate clipping
remove redundant idct

Originally committed as revision 16044 to svn://svn.ffmpeg.org/ffmpeg/trunk
tags/v0.5
Loren Merritt 17 years ago
parent
8153f14444
commit
5fac277602
2 changed files with 202 additions and 45 deletions
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  1. +198
    -45
      libavcodec/mjpegdec.c
  2. +4
    -0
      libavcodec/mjpegdec.h

+ 198
- 45
libavcodec/mjpegdec.c View File

@@ -351,9 +351,17 @@ int ff_mjpeg_decode_sof(MJpegDecodeContext *s)

/* totally blank picture as progressive JPEG will only add details to it */
if(s->progressive){
memset(s->picture.data[0], 0, s->picture.linesize[0] * s->height);
memset(s->picture.data[1], 0, s->picture.linesize[1] * s->height >> (s->v_max - s->v_count[1]));
memset(s->picture.data[2], 0, s->picture.linesize[2] * s->height >> (s->v_max - s->v_count[2]));
int bw = (width + s->h_max*8-1) / (s->h_max*8);
int bh = (height + s->v_max*8-1) / (s->v_max*8);
for(i=0; i<s->nb_components; i++) {
int size = bw * bh * s->h_count[i] * s->v_count[i];
av_freep(&s->blocks[i]);
av_freep(&s->last_nnz[i]);
s->blocks[i] = av_malloc(size * sizeof(**s->blocks));
s->last_nnz[i] = av_mallocz(size * sizeof(**s->last_nnz));
s->block_stride[i] = bw * s->h_count[i];
}
memset(s->coefs_finished, 0, sizeof(s->coefs_finished));
}
return 0;
}
@@ -432,27 +440,29 @@ static int decode_block(MJpegDecodeContext *s, DCTELEM *block,
return 0;
}

static int decode_dc_progressive(MJpegDecodeContext *s, DCTELEM *block, int component,
int dc_index, int16_t *quant_matrix, int Al)
{
int val;
memset(block, 0, 64*sizeof(DCTELEM));
val = mjpeg_decode_dc(s, dc_index);
if (val == 0xffff) {
av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
return -1;
}
val = (val * quant_matrix[0] << Al) + s->last_dc[component];
s->last_dc[component] = val;
block[0] = val;
return 0;
}

/* decode block and dequantize - progressive JPEG version */
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
int component, int dc_index, int ac_index, int16_t *quant_matrix,
int ss, int se, int Ah, int Al, int *EOBRUN)
static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
int ac_index, int16_t *quant_matrix,
int ss, int se, int Al, int *EOBRUN)
{
int code, i, j, level, val, run;

/* DC coef */
if(!ss){
val = mjpeg_decode_dc(s, dc_index);
if (val == 0xffff) {
av_log(s->avctx, AV_LOG_ERROR, "error dc\n");
return -1;
}
val = (val * quant_matrix[0] << Al) + s->last_dc[component];
}else
val = 0;
s->last_dc[component] = val;
block[0] = val;
if(!se) return 0;
/* AC coefs */
if(*EOBRUN){
(*EOBRUN)--;
return 0;
@@ -505,9 +515,100 @@ static int decode_block_progressive(MJpegDecodeContext *s, DCTELEM *block,
}
}
CLOSE_READER(re, &s->gb)}
if(i > *last_nnz)
*last_nnz = i;
return 0;
}

#define REFINE_BIT(j) {\
UPDATE_CACHE(re, &s->gb);\
sign = block[j]>>15;\
block[j] += SHOW_UBITS(re, &s->gb, 1) * ((quant_matrix[j]^sign)-sign) << Al;\
LAST_SKIP_BITS(re, &s->gb, 1);\
}

#define ZERO_RUN \
for(;;i++) {\
if(i > last) {\
i += run;\
if(i > se) {\
av_log(s->avctx, AV_LOG_ERROR, "error count: %d\n", i);\
return -1;\
}\
break;\
}\
j = s->scantable.permutated[i];\
if(block[j])\
REFINE_BIT(j)\
else if(run-- == 0)\
break;\
}

/* decode block and dequantize - progressive JPEG refinement pass */
static int decode_block_refinement(MJpegDecodeContext *s, DCTELEM *block, uint8_t *last_nnz,
int ac_index, int16_t *quant_matrix,
int ss, int se, int Al, int *EOBRUN)
{
int code, i=ss, j, sign, val, run;
int last = FFMIN(se, *last_nnz);

OPEN_READER(re, &s->gb);
if(*EOBRUN)
(*EOBRUN)--;
else {
for(;;i++) {
UPDATE_CACHE(re, &s->gb);
GET_VLC(code, re, &s->gb, s->vlcs[1][ac_index].table, 9, 2)
/* Progressive JPEG use AC coeffs from zero and this decoder sets offset 16 by default */
code -= 16;
if(code & 0xF) {
run = ((unsigned) code) >> 4;
UPDATE_CACHE(re, &s->gb);
val = SHOW_UBITS(re, &s->gb, 1);
LAST_SKIP_BITS(re, &s->gb, 1);
ZERO_RUN;
j = s->scantable.permutated[i];
val--;
block[j] = ((quant_matrix[j]^val)-val) << Al;
if(i == se) {
if(i > *last_nnz)
*last_nnz = i;
CLOSE_READER(re, &s->gb)
return 0;
}
}else{
run = ((unsigned) code) >> 4;
if(run == 0xF){
ZERO_RUN;
}else{
val = run;
run = (1 << run);
if(val) {
UPDATE_CACHE(re, &s->gb);
run += SHOW_UBITS(re, &s->gb, val);
LAST_SKIP_BITS(re, &s->gb, val);
}
*EOBRUN = run - 1;
break;
}
}
}

if(i > *last_nnz)
*last_nnz = i;
}

for(;i<=last;i++) {
j = s->scantable.permutated[i];
if(block[j])
REFINE_BIT(j)
}
CLOSE_READER(re, &s->gb);

return 0;
}
#undef REFINE_BIT
#undef ZERO_RUN

static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point_transform){
int i, mb_x, mb_y;
@@ -660,18 +761,16 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
return 0;
}

static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, int se, int Ah, int Al){
static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, int Al){
int i, mb_x, mb_y;
int EOBRUN = 0;
uint8_t* data[MAX_COMPONENTS];
int linesize[MAX_COMPONENTS];

if(Ah) return 0; /* TODO decode refinement planes too */

for(i=0; i < nb_components; i++) {
int c = s->comp_index[i];
data[c] = s->picture.data[c];
linesize[c]=s->linesize[c];
s->coefs_finished[c] |= 1;
if(s->avctx->codec->id==CODEC_ID_AMV) {
//picture should be flipped upside-down for this codec
assert(!(s->avctx->flags & CODEC_FLAG_EMU_EDGE));
@@ -695,30 +794,32 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, i
x = 0;
y = 0;
for(j=0;j<n;j++) {
memset(s->block, 0, sizeof(s->block));
if (!s->progressive && decode_block(s, s->block, i,
s->dc_index[i], s->ac_index[i],
s->quant_matrixes[ s->quant_index[c] ]) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
if (s->progressive && decode_block_progressive(s, s->block, i,
s->dc_index[i], s->ac_index[i],
s->quant_matrixes[ s->quant_index[c] ], ss, se, Ah, Al, &EOBRUN) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
// av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
ptr = data[c] +
(((linesize[c] * (v * mb_y + y) * 8) +
(h * mb_x + x) * 8) >> s->avctx->lowres);
if (s->interlaced && s->bottom_field)
if(s->interlaced && s->bottom_field)
ptr += linesize[c] >> 1;
//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
if(!s->progressive)
if(!s->progressive) {
memset(s->block, 0, sizeof(s->block));
if(decode_block(s, s->block, i,
s->dc_index[i], s->ac_index[i],
s->quant_matrixes[ s->quant_index[c] ]) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
s->dsp.idct_put(ptr, linesize[c], s->block);
else
s->dsp.idct_add(ptr, linesize[c], s->block);
} else {
int block_idx = s->block_stride[c] * (v * mb_y + y) + (h * mb_x + x);
DCTELEM *block = s->blocks[c][block_idx];
if(Ah)
block[0] += get_bits1(&s->gb) * s->quant_matrixes[ s->quant_index[c] ][0] << Al;
else if(decode_dc_progressive(s, block, i, s->dc_index[i], s->quant_matrixes[ s->quant_index[c] ], Al) < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
}
// av_log(s->avctx, AV_LOG_DEBUG, "mb: %d %d processed\n", mb_y, mb_x);
//av_log(NULL, AV_LOG_DEBUG, "%d %d %d %d %d %d %d %d \n", mb_x, mb_y, x, y, c, s->bottom_field, (v * mb_y + y) * 8, (h * mb_x + x) * 8);
if (++x == h) {
x = 0;
y++;
@@ -738,6 +839,49 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int ss, i
return 0;
}

static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al){
int mb_x, mb_y;
int EOBRUN = 0;
int c = s->comp_index[0];
uint8_t* data = s->picture.data[c];
int linesize = s->linesize[c];
int last_scan = 0;
int16_t *quant_matrix = s->quant_matrixes[ s->quant_index[c] ];

if(!Al) {
s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
last_scan = !~s->coefs_finished[c];
}

if(s->interlaced && s->bottom_field)
data += linesize >> 1;

for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
uint8_t *ptr = data + (mb_y*linesize*8 >> s->avctx->lowres);
int block_idx = mb_y * s->block_stride[c];
DCTELEM (*block)[64] = &s->blocks[c][block_idx];
uint8_t *last_nnz = &s->last_nnz[c][block_idx];
for(mb_x = 0; mb_x < s->mb_width; mb_x++, block++, last_nnz++) {
int ret;
if(Ah)
ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
quant_matrix, ss, se, Al, &EOBRUN);
else
ret = decode_block_progressive(s, *block, last_nnz, s->ac_index[0],
quant_matrix, ss, se, Al, &EOBRUN);
if(ret < 0) {
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
if(last_scan) {
s->dsp.idct_put(ptr, linesize, *block);
ptr += 8 >> s->avctx->lowres;
}
}
}
return 0;
}

int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
{
int len, nb_components, i, h, v, predictor, point_transform;
@@ -849,8 +993,13 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s)
}
}
}else{
if(mjpeg_decode_scan(s, nb_components, predictor, ilv, prev_shift, point_transform) < 0)
return -1;
if(s->progressive && predictor) {
if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform) < 0)
return -1;
} else {
if(mjpeg_decode_scan(s, nb_components, prev_shift, point_transform) < 0)
return -1;
}
}
emms_c();
return 0;
@@ -1354,6 +1503,10 @@ av_cold int ff_mjpeg_decode_end(AVCodecContext *avctx)
for(j=0;j<4;j++)
free_vlc(&s->vlcs[i][j]);
}
for(i=0; i<MAX_COMPONENTS; i++) {
av_freep(&s->blocks[i]);
av_freep(&s->last_nnz[i]);
}
return 0;
}



+ 4
- 0
libavcodec/mjpegdec.h View File

@@ -67,6 +67,7 @@ typedef struct MJpegDecodeContext {
int width, height;
int mb_width, mb_height;
int nb_components;
int block_stride[MAX_COMPONENTS];
int component_id[MAX_COMPONENTS];
int h_count[MAX_COMPONENTS]; /* horizontal and vertical count for each component */
int v_count[MAX_COMPONENTS];
@@ -83,6 +84,9 @@ typedef struct MJpegDecodeContext {
int linesize[MAX_COMPONENTS]; ///< linesize << interlaced
int8_t *qscale_table;
DECLARE_ALIGNED_16(DCTELEM, block[64]);
DCTELEM (*blocks[MAX_COMPONENTS])[64]; ///< intermediate sums (progressive mode)
uint8_t *last_nnz[MAX_COMPONENTS];
uint64_t coefs_finished[MAX_COMPONENTS]; ///< bitmask of which coefs have been completely decoded (progressive mode)
ScanTable scantable;
DSPContext dsp;



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