* QPEG codec
* Copyright (c) 2004 Konstantin Shishkov
*
- * This library is free software; you can redistribute it and/or
+ * This file is part of FFmpeg.
+ *
+ * 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 of the License, or (at your option) any later version.
+ * version 2.1 of the License, or (at your option) any later version.
*
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
-
+
/**
* @file qpeg.c
* QPEG codec.
*/
-
+
#include "avcodec.h"
-#include "mpegvideo.h"
typedef struct QpegContext{
AVCodecContext *avctx;
uint8_t *refdata;
} QpegContext;
-static void qpeg_decode_intra(uint8_t *src, uint8_t *dst, int size,
- int stride, int width, int height)
+static void qpeg_decode_intra(const uint8_t *src, uint8_t *dst, int size,
+ int stride, int width, int height)
{
int i;
int code;
int c0, c1;
int run, copy;
int filled = 0;
-
+ int rows_to_go;
+
+ rows_to_go = height;
height--;
dst = dst + height * stride;
-
- while(size > 0) {
- code = *src++;
- size--;
- run = copy = 0;
- if(code == 0xFC) /* end-of-picture code */
- break;
- if(code >= 0xF8) { /* very long run */
- c0 = *src++;
- c1 = *src++;
- size -= 2;
- run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
- } else if (code >= 0xF0) { /* long run */
- c0 = *src++;
- size--;
- run = ((code & 0xF) << 8) + c0 + 2;
- } else if (code >= 0xE0) { /* short run */
- run = (code & 0x1F) + 2;
- } else if (code >= 0xC0) { /* very long copy */
- c0 = *src++;
- c1 = *src++;
- size -= 2;
- copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
- } else if (code >= 0x80) { /* long copy */
- c0 = *src++;
- size--;
- copy = ((code & 0x7F) << 8) + c0 + 1;
- } else { /* short copy */
- copy = code + 1;
- }
-
- /* perform actual run or copy */
- if(run) {
- int p;
-
- p = *src++;
- size--;
- for(i = 0; i < run; i++) {
- dst[filled++] = p;
- if (filled >= width) {
- filled = 0;
- dst -= stride;
- }
- }
- } else {
- for(i = 0; i < copy; i++) {
- dst[filled++] = *src++;
- if (filled >= width) {
- filled = 0;
- dst -= stride;
- }
- }
- size -= copy;
- }
+
+ while((size > 0) && (rows_to_go > 0)) {
+ code = *src++;
+ size--;
+ run = copy = 0;
+ if(code == 0xFC) /* end-of-picture code */
+ break;
+ if(code >= 0xF8) { /* very long run */
+ c0 = *src++;
+ c1 = *src++;
+ size -= 2;
+ run = ((code & 0x7) << 16) + (c0 << 8) + c1 + 2;
+ } else if (code >= 0xF0) { /* long run */
+ c0 = *src++;
+ size--;
+ run = ((code & 0xF) << 8) + c0 + 2;
+ } else if (code >= 0xE0) { /* short run */
+ run = (code & 0x1F) + 2;
+ } else if (code >= 0xC0) { /* very long copy */
+ c0 = *src++;
+ c1 = *src++;
+ size -= 2;
+ copy = ((code & 0x3F) << 16) + (c0 << 8) + c1 + 1;
+ } else if (code >= 0x80) { /* long copy */
+ c0 = *src++;
+ size--;
+ copy = ((code & 0x7F) << 8) + c0 + 1;
+ } else { /* short copy */
+ copy = code + 1;
+ }
+
+ /* perform actual run or copy */
+ if(run) {
+ int p;
+
+ p = *src++;
+ size--;
+ for(i = 0; i < run; i++) {
+ dst[filled++] = p;
+ if (filled >= width) {
+ filled = 0;
+ dst -= stride;
+ rows_to_go--;
+ if(rows_to_go <= 0)
+ break;
+ }
+ }
+ } else {
+ size -= copy;
+ for(i = 0; i < copy; i++) {
+ dst[filled++] = *src++;
+ if (filled >= width) {
+ filled = 0;
+ dst -= stride;
+ rows_to_go--;
+ if(rows_to_go <= 0)
+ break;
+ }
+ }
+ }
}
}
-static int qpeg_table_h[16] =
+static const int qpeg_table_h[16] =
{ 0x00, 0x20, 0x20, 0x20, 0x18, 0x10, 0x10, 0x20, 0x10, 0x08, 0x18, 0x08, 0x08, 0x18, 0x10, 0x04};
-static int qpeg_table_w[16] =
+static const int qpeg_table_w[16] =
{ 0x00, 0x20, 0x18, 0x08, 0x18, 0x10, 0x20, 0x10, 0x08, 0x10, 0x20, 0x20, 0x08, 0x10, 0x18, 0x04};
-
+
/* Decodes delta frames */
-static void qpeg_decode_inter(uint8_t *src, uint8_t *dst, int size,
- int stride, int width, int height,
- int delta, uint8_t *ctable, uint8_t *refdata)
+static void qpeg_decode_inter(const uint8_t *src, uint8_t *dst, int size,
+ int stride, int width, int height,
+ int delta, const uint8_t *ctable, uint8_t *refdata)
{
int i, j;
int code;
int filled = 0;
- uint8_t *blkdata;
-
+ int orig_height;
+
/* copy prev frame */
for(i = 0; i < height; i++)
- memcpy(refdata + (i * width), dst + (i * stride), width);
-
- blkdata = src - 0x86;
+ memcpy(refdata + (i * width), dst + (i * stride), width);
+
+ orig_height = height;
height--;
dst = dst + height * stride;
- while(size > 0) {
- code = *src++;
- size--;
-
- if(delta) {
- /* motion compensation */
- while((code & 0xF0) == 0xF0) {
- if(delta == 1) {
- int me_idx;
- int me_w, me_h, me_x, me_y;
- uint8_t *me_plane;
- int corr, val;
-
- /* get block size by index */
- me_idx = code & 0xF;
- me_w = qpeg_table_w[me_idx];
- me_h = qpeg_table_h[me_idx];
-
- /* extract motion vector */
- corr = *src++;
- size--;
-
- val = corr >> 4;
- if(val > 7)
- val -= 16;
- me_x = val;
-
- val = corr & 0xF;
- if(val > 7)
- val -= 16;
- me_y = val;
-
- /* do motion compensation */
- me_plane = refdata + (filled + me_x) + (height - me_y) * width;
- for(j = 0; j < me_h; j++) {
- for(i = 0; i < me_w; i++)
- dst[filled + i - (j * stride)] = me_plane[i - (j * width)];
- }
- }
- code = *src++;
- size--;
- }
- }
-
- if(code == 0xE0) /* end-of-picture code */
- break;
- if(code > 0xE0) { /* run code: 0xE1..0xFF */
- int p;
-
- code &= 0x1F;
- p = *src++;
- size--;
- for(i = 0; i <= code; i++) {
- dst[filled++] = p;
- if(filled >= width) {
- filled = 0;
- dst -= stride;
- height--;
- }
- }
- } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
- code &= 0x1F;
-
- for(i = 0; i <= code; i++) {
- dst[filled++] = *src++;
- if(filled >= width) {
- filled = 0;
- dst -= stride;
- height--;
- }
- }
- size -= code + 1;
- } else if(code >= 0x80) { /* skip code: 0x80..0xBF */
- int skip;
-
- code &= 0x3F;
- /* codes 0x80 and 0x81 are actually escape codes,
- skip value minus constant is in the next byte */
- if(!code)
- skip = (*src++) + 64;
- else if(code == 1)
- skip = (*src++) + 320;
- else
- skip = code;
- filled += skip;
- while( filled >= width) {
- filled -= width;
- dst -= stride;
- height--;
- }
- } else {
- /* zero code treated as one-pixel skip */
- if(code)
- dst[filled++] = ctable[code & 0x7F];
- else
- filled++;
- if(filled >= width) {
- filled = 0;
- dst -= stride;
- height--;
- }
- }
+ while((size > 0) && (height >= 0)) {
+ code = *src++;
+ size--;
+
+ if(delta) {
+ /* motion compensation */
+ while((code & 0xF0) == 0xF0) {
+ if(delta == 1) {
+ int me_idx;
+ int me_w, me_h, me_x, me_y;
+ uint8_t *me_plane;
+ int corr, val;
+
+ /* get block size by index */
+ me_idx = code & 0xF;
+ me_w = qpeg_table_w[me_idx];
+ me_h = qpeg_table_h[me_idx];
+
+ /* extract motion vector */
+ corr = *src++;
+ size--;
+
+ val = corr >> 4;
+ if(val > 7)
+ val -= 16;
+ me_x = val;
+
+ val = corr & 0xF;
+ if(val > 7)
+ val -= 16;
+ me_y = val;
+
+ /* check motion vector */
+ if ((me_x + filled < 0) || (me_x + me_w + filled > width) ||
+ (height - me_y - me_h < 0) || (height - me_y > orig_height) ||
+ (filled + me_w > width) || (height - me_h < 0))
+ av_log(NULL, AV_LOG_ERROR, "Bogus motion vector (%i,%i), block size %ix%i at %i,%i\n",
+ me_x, me_y, me_w, me_h, filled, height);
+ else {
+ /* do motion compensation */
+ me_plane = refdata + (filled + me_x) + (height - me_y) * width;
+ for(j = 0; j < me_h; j++) {
+ for(i = 0; i < me_w; i++)
+ dst[filled + i - (j * stride)] = me_plane[i - (j * width)];
+ }
+ }
+ }
+ code = *src++;
+ size--;
+ }
+ }
+
+ if(code == 0xE0) /* end-of-picture code */
+ break;
+ if(code > 0xE0) { /* run code: 0xE1..0xFF */
+ int p;
+
+ code &= 0x1F;
+ p = *src++;
+ size--;
+ for(i = 0; i <= code; i++) {
+ dst[filled++] = p;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
+ } else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
+ code &= 0x1F;
+
+ for(i = 0; i <= code; i++) {
+ dst[filled++] = *src++;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
+ size -= code + 1;
+ } else if(code >= 0x80) { /* skip code: 0x80..0xBF */
+ int skip;
+
+ code &= 0x3F;
+ /* codes 0x80 and 0x81 are actually escape codes,
+ skip value minus constant is in the next byte */
+ if(!code)
+ skip = (*src++) + 64;
+ else if(code == 1)
+ skip = (*src++) + 320;
+ else
+ skip = code;
+ filled += skip;
+ while( filled >= width) {
+ filled -= width;
+ dst -= stride;
+ height--;
+ if(height < 0)
+ break;
+ }
+ } else {
+ /* zero code treated as one-pixel skip */
+ if(code)
+ dst[filled++] = ctable[code & 0x7F];
+ else
+ filled++;
+ if(filled >= width) {
+ filled = 0;
+ dst -= stride;
+ height--;
+ }
+ }
}
}
-static int decode_frame(AVCodecContext *avctx,
+static int decode_frame(AVCodecContext *avctx,
void *data, int *data_size,
- uint8_t *buf, int buf_size)
+ const uint8_t *buf, int buf_size)
{
QpegContext * const a = avctx->priv_data;
AVFrame * const p= (AVFrame*)&a->pic;
uint8_t* outdata;
int delta;
-
- /* special case for last picture */
- if (buf_size == 0) {
- return 0;
- }
if(p->data[0])
avctx->release_buffer(avctx, p);
}
outdata = a->pic.data[0];
if(buf[0x85] == 0x10) {
- qpeg_decode_intra(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height);
+ qpeg_decode_intra(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height);
} else {
- delta = buf[0x85];
- qpeg_decode_inter(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height, delta, buf + 4, a->refdata);
+ delta = buf[0x85];
+ qpeg_decode_inter(buf+0x86, outdata, buf_size - 0x86, a->pic.linesize[0], avctx->width, avctx->height, delta, buf + 4, a->refdata);
}
/* make the palette available on the way out */
*data_size = sizeof(AVFrame);
*(AVFrame*)data = a->pic;
-
+
return buf_size;
}
-static int decode_init(AVCodecContext *avctx){
+static av_cold int decode_init(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
-
+
a->avctx = avctx;
avctx->pix_fmt= PIX_FMT_PAL8;
- avctx->has_b_frames = 0;
a->pic.data[0] = NULL;
a->refdata = av_malloc(avctx->width * avctx->height);
return 0;
}
-static int decode_end(AVCodecContext *avctx){
+static av_cold int decode_end(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
+ AVFrame * const p= (AVFrame*)&a->pic;
+
+ if(p->data[0])
+ avctx->release_buffer(avctx, p);
av_free(a->refdata);
return 0;
decode_end,
decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"),
};
projects / ffmpeg / blobdiff