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roqvideo: convert to bytestream2 API. 

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
This commit is contained in:
Ronald S. Bultje 2012-03-06 15:58:35 -08:00
parent 93b53ffb1a
commit cdf1577162
2 changed files with 37 additions and 36 deletions
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4
libavcodec/roqvideo.h
View File

@ -24,6 +24,7 @@
#include "libavutil/lfg.h"
#include "avcodec.h"
#include "bytestream.h"
#include "dsputil.h"
typedef struct {
@ -53,8 +54,7 @@ typedef struct RoqContext {
roq_cell cb2x2[256];
roq_qcell cb4x4[256];
const unsigned char *buf;
int size;
GetByteContext gb;
int width, height;
/* Encoder only data */

69
libavcodec/roqvideodec.c
View File

@ -38,16 +38,15 @@ static void roqvideo_decode_frame(RoqContext *ri)
unsigned int chunk_id = 0, chunk_arg = 0;
unsigned long chunk_size = 0;
int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
int vqid, bpos, xpos, ypos, xp, yp, x, y, mx, my;
int vqid, xpos, ypos, xp, yp, x, y, mx, my;
int frame_stats[2][4] = {{0},{0}};
roq_qcell *qcell;
const unsigned char *buf = ri->buf;
const unsigned char *buf_end = ri->buf + ri->size;
int64_t chunk_start;
while (buf < buf_end) {
chunk_id = bytestream_get_le16(&buf);
chunk_size = bytestream_get_le32(&buf);
chunk_arg = bytestream_get_le16(&buf);
while (bytestream2_get_bytes_left(&ri->gb) > 0) {
chunk_id = bytestream2_get_le16(&ri->gb);
chunk_size = bytestream2_get_le32(&ri->gb);
chunk_arg = bytestream2_get_le16(&ri->gb);
if(chunk_id == RoQ_QUAD_VQ)
break;
@ -57,25 +56,26 @@ static void roqvideo_decode_frame(RoqContext *ri)
if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
nv2 = 256;
for(i = 0; i < nv1; i++) {
ri->cb2x2[i].y[0] = *buf++;
ri->cb2x2[i].y[1] = *buf++;
ri->cb2x2[i].y[2] = *buf++;
ri->cb2x2[i].y[3] = *buf++;
ri->cb2x2[i].u = *buf++;
ri->cb2x2[i].v = *buf++;
ri->cb2x2[i].y[0] = bytestream2_get_byte(&ri->gb);
ri->cb2x2[i].y[1] = bytestream2_get_byte(&ri->gb);
ri->cb2x2[i].y[2] = bytestream2_get_byte(&ri->gb);
ri->cb2x2[i].y[3] = bytestream2_get_byte(&ri->gb);
ri->cb2x2[i].u = bytestream2_get_byte(&ri->gb);
ri->cb2x2[i].v = bytestream2_get_byte(&ri->gb);
}
for(i = 0; i < nv2; i++)
for(j = 0; j < 4; j++)
ri->cb4x4[i].idx[j] = *buf++;
ri->cb4x4[i].idx[j] = bytestream2_get_byte(&ri->gb);
}
}
bpos = xpos = ypos = 0;
while(bpos < chunk_size) {
chunk_start = bytestream2_tell(&ri->gb);
xpos = ypos = 0;
while (bytestream2_tell(&ri->gb) < chunk_start + chunk_size) {
for (yp = ypos; yp < ypos + 16; yp += 8)
for (xp = xpos; xp < xpos + 16; xp += 8) {
if (vqflg_pos < 0) {
vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
vqflg = bytestream2_get_le16(&ri->gb);
vqflg_pos = 7;
}
vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
@ -85,13 +85,15 @@ static void roqvideo_decode_frame(RoqContext *ri)
switch(vqid) {
case RoQ_ID_MOT:
break;
case RoQ_ID_FCC:
mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
case RoQ_ID_FCC: {
int byte = bytestream2_get_byte(&ri->gb);
mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
ff_apply_motion_8x8(ri, xp, yp, mx, my);
break;
}
case RoQ_ID_SLD:
qcell = ri->cb4x4 + buf[bpos++];
qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
ff_apply_vector_4x4(ri, xp, yp, ri->cb2x2 + qcell->idx[0]);
ff_apply_vector_4x4(ri, xp+4, yp, ri->cb2x2 + qcell->idx[1]);
ff_apply_vector_4x4(ri, xp, yp+4, ri->cb2x2 + qcell->idx[2]);
@ -104,8 +106,7 @@ static void roqvideo_decode_frame(RoqContext *ri)
if(k & 0x02) y += 4;
if (vqflg_pos < 0) {
vqflg = buf[bpos++];
vqflg |= (buf[bpos++] << 8);
vqflg = bytestream2_get_le16(&ri->gb);
vqflg_pos = 7;
}
vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
@ -114,24 +115,25 @@ static void roqvideo_decode_frame(RoqContext *ri)
switch(vqid) {
case RoQ_ID_MOT:
break;
case RoQ_ID_FCC:
mx = 8 - (buf[bpos] >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (buf[bpos++] & 0xf) - ((signed char) chunk_arg);
case RoQ_ID_FCC: {
int byte = bytestream2_get_byte(&ri->gb);
mx = 8 - (byte >> 4) - ((signed char) (chunk_arg >> 8));
my = 8 - (byte & 0xf) - ((signed char) chunk_arg);
ff_apply_motion_4x4(ri, x, y, mx, my);
break;
}
case RoQ_ID_SLD:
qcell = ri->cb4x4 + buf[bpos++];
qcell = ri->cb4x4 + bytestream2_get_byte(&ri->gb);
ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + qcell->idx[0]);
ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + qcell->idx[1]);
ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + qcell->idx[2]);
ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + qcell->idx[3]);
break;
case RoQ_ID_CCC:
ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + buf[bpos]);
ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + buf[bpos+1]);
ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + buf[bpos+2]);
ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + buf[bpos+3]);
bpos += 4;
ff_apply_vector_2x2(ri, x, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
ff_apply_vector_2x2(ri, x+2, y, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
ff_apply_vector_2x2(ri, x, y+2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
ff_apply_vector_2x2(ri, x+2, y+2, ri->cb2x2 + bytestream2_get_byte(&ri->gb));
break;
}
}
@ -185,8 +187,7 @@ static int roq_decode_frame(AVCodecContext *avctx,
av_picture_copy((AVPicture*)s->current_frame, (AVPicture*)s->last_frame,
avctx->pix_fmt, avctx->width, avctx->height);
s->buf = buf;
s->size = buf_size;
bytestream2_init(&s->gb, buf, buf_size);
roqvideo_decode_frame(s);
*data_size = sizeof(AVFrame);