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-rw-r--r--libavcodec/mjpegdec.c73
1 files changed, 29 insertions, 44 deletions
diff --git a/libavcodec/mjpegdec.c b/libavcodec/mjpegdec.c
index 391d58de6b..02c66f504b 100644
--- a/libavcodec/mjpegdec.c
+++ b/libavcodec/mjpegdec.c
@@ -8,20 +8,20 @@
* aspecting, new decode_frame mechanism and apple mjpeg-b support
* by Alex Beregszaszi
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
- * Libav is distributed in the hope that it will be useful,
+ * FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
- * License along with Libav; if not, write to the Free Software
+ * License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
@@ -34,6 +34,7 @@
#include <assert.h>
#include "libavutil/imgutils.h"
+#include "libavutil/avassert.h"
#include "avcodec.h"
#include "dsputil.h"
#include "mjpeg.h"
@@ -83,6 +84,7 @@ av_cold int ff_mjpeg_decode_init(AVCodecContext *avctx)
if (!s->picture_ptr)
s->picture_ptr = &s->picture;
+ avcodec_get_frame_defaults(&s->picture);
s->avctx = avctx;
dsputil_init(&s->dsp, avctx);
@@ -637,7 +639,7 @@ static int ljpeg_decode_rgb_scan(MJpegDecodeContext *s, int predictor, int point
}
for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
const int modified_predictor= mb_y ? predictor : 1;
- uint8_t *ptr = s->picture_ptr->data[0] + (linesize * mb_y);
+ uint8_t *ptr = s->picture.data[0] + (linesize * mb_y);
if (s->interlaced && s->bottom_field)
ptr += linesize >> 1;
@@ -714,7 +716,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
for(j=0; j<n; j++) {
int pred;
- ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
if(y==0 && mb_y==0){
if(x==0 && mb_x==0){
pred= 128 << point_transform;
@@ -754,7 +756,7 @@ static int ljpeg_decode_yuv_scan(MJpegDecodeContext *s, int predictor, int point
for(j=0; j<n; j++) {
int pred;
- ptr = s->picture_ptr->data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
+ ptr = s->picture.data[c] + (linesize * (v * mb_y + y)) + (h * mb_x + x); //FIXME optimize this crap
PREDICT(pred, ptr[-linesize-1], ptr[-linesize], ptr[-1], predictor);
*ptr= pred + (mjpeg_decode_dc(s, s->dc_index[i]) << point_transform);
if (++x == h) {
@@ -879,9 +881,12 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, i
}
}
- if (s->restart_interval && !--s->restart_count) {
+ if (s->restart_interval && show_bits(&s->gb, 8) == 0xFF){/* skip RSTn */
+ --s->restart_count;
align_get_bits(&s->gb);
- skip_bits(&s->gb, 16); /* skip RSTn */
+ while(show_bits(&s->gb, 8) == 0xFF)
+ skip_bits(&s->gb, 8);
+ skip_bits(&s->gb, 8);
for (i=0; i<nb_components; i++) /* reset dc */
s->last_dc[i] = 1024;
}
@@ -890,43 +895,29 @@ static int mjpeg_decode_scan(MJpegDecodeContext *s, int nb_components, int Ah, i
return 0;
}
-static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int se, int Ah, int Al,
- const uint8_t *mb_bitmask, const AVFrame *reference){
+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_ptr->data[c];
- const uint8_t *reference_data = reference ? reference->data[c] : NULL;
+ 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] ];
- GetBitContext mb_bitmask_gb;
-
- if (mb_bitmask) {
- init_get_bits(&mb_bitmask_gb, mb_bitmask, s->mb_width*s->mb_height);
- }
if(!Al) {
s->coefs_finished[c] |= (1LL<<(se+1))-(1LL<<ss);
last_scan = !~s->coefs_finished[c];
}
- if(s->interlaced && s->bottom_field) {
- int offset = linesize >> 1;
- data += offset;
- reference_data += offset;
- }
+ if(s->interlaced && s->bottom_field)
+ data += linesize >> 1;
for(mb_y = 0; mb_y < s->mb_height; mb_y++) {
- int block_offset = (mb_y*linesize*8 >> s->avctx->lowres);
- uint8_t *ptr = data + block_offset;
+ 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++) {
- const int copy_mb = mb_bitmask && !get_bits1(&mb_bitmask_gb);
-
- if (!copy_mb) {
int ret;
if(Ah)
ret = decode_block_refinement(s, *block, last_nnz, s->ac_index[0],
@@ -938,15 +929,9 @@ static int mjpeg_decode_scan_progressive_ac(MJpegDecodeContext *s, int ss, int s
av_log(s->avctx, AV_LOG_ERROR, "error y=%d x=%d\n", mb_y, mb_x);
return -1;
}
- }
-
if(last_scan) {
- if (copy_mb) {
- mjpeg_copy_block(ptr, reference_data + block_offset, linesize, s->avctx->lowres);
- } else {
s->dsp.idct_put(ptr, linesize, *block);
ptr += 8 >> s->avctx->lowres;
- }
}
}
}
@@ -1008,8 +993,11 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
predictor= get_bits(&s->gb, 8); /* JPEG Ss / lossless JPEG predictor /JPEG-LS NEAR */
ilv= get_bits(&s->gb, 8); /* JPEG Se / JPEG-LS ILV */
- prev_shift = get_bits(&s->gb, 4); /* Ah */
- point_transform= get_bits(&s->gb, 4); /* Al */
+ if(s->avctx->codec_tag != AV_RL32("CJPG")){
+ prev_shift = get_bits(&s->gb, 4); /* Ah */
+ point_transform= get_bits(&s->gb, 4); /* Al */
+ }else
+ prev_shift= point_transform= 0;
for(i=0;i<nb_components;i++)
s->last_dc[i] = 1024;
@@ -1029,8 +1017,8 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
}
if(s->avctx->debug & FF_DEBUG_PICT_INFO)
- av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
- predictor, point_transform, ilv, s->bits,
+ av_log(s->avctx, AV_LOG_DEBUG, "%s %s p:%d >>:%d ilv:%d bits:%d skip:%d %s\n", s->lossless ? "lossless" : "sequential DCT", s->rgb ? "RGB" : "",
+ predictor, point_transform, ilv, s->bits, s->mjpb_skiptosod,
s->pegasus_rct ? "PRCT" : (s->rct ? "RCT" : ""));
@@ -1039,6 +1027,7 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
skip_bits(&s->gb, 8);
if(s->lossless){
+ av_assert0(s->picture_ptr == &s->picture);
if(CONFIG_JPEGLS_DECODER && s->ls){
// for(){
// reset_ls_coding_parameters(s, 0);
@@ -1056,8 +1045,8 @@ int ff_mjpeg_decode_sos(MJpegDecodeContext *s,
}
}else{
if(s->progressive && predictor) {
- if(mjpeg_decode_scan_progressive_ac(s, predictor, ilv, prev_shift, point_transform,
- mb_bitmask, reference) < 0)
+ av_assert0(s->picture_ptr == &s->picture);
+ 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,
@@ -1299,9 +1288,7 @@ static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
const uint8_t *buf_ptr;
unsigned int v, v2;
int val;
-#ifdef DEBUG
int skipped=0;
-#endif
buf_ptr = *pbuf_ptr;
while (buf_ptr < buf_end) {
@@ -1311,9 +1298,7 @@ static int find_marker(const uint8_t **pbuf_ptr, const uint8_t *buf_end)
val = *buf_ptr++;
goto found;
}
-#ifdef DEBUG
skipped++;
-#endif
}
val = -1;
found:
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-16 04:03:24 +0000