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-rw-r--r--libavcodec/qpeg.c63
1 files changed, 46 insertions, 17 deletions
diff --git a/libavcodec/qpeg.c b/libavcodec/qpeg.c
index bb963ed1a3..6015b7f4b0 100644
--- a/libavcodec/qpeg.c
+++ b/libavcodec/qpeg.c
@@ -2,20 +2,20 @@
* QPEG codec
* Copyright (c) 2004 Konstantin Shishkov
*
- * 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
*/
@@ -30,8 +30,7 @@
typedef struct QpegContext{
AVCodecContext *avctx;
- AVFrame pic;
- uint8_t *refdata;
+ AVFrame pic, ref;
uint32_t pal[256];
GetByteContext buffer;
} QpegContext;
@@ -121,9 +120,12 @@ static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
int filled = 0;
int orig_height;
+ if(!refdata)
+ refdata= dst;
+
/* copy prev frame */
for(i = 0; i < height; i++)
- memcpy(refdata + (i * width), dst + (i * stride), width);
+ memcpy(dst + (i * stride), refdata + (i * stride), width);
orig_height = height;
height--;
@@ -134,7 +136,7 @@ static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
if(delta) {
/* motion compensation */
- while((code & 0xF0) == 0xF0) {
+ while(bytestream2_get_bytes_left(&qctx->buffer) > 0 && (code & 0xF0) == 0xF0) {
if(delta == 1) {
int me_idx;
int me_w, me_h, me_x, me_y;
@@ -167,10 +169,10 @@ static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
me_x, me_y, me_w, me_h, filled, height);
else {
/* do motion compensation */
- me_plane = refdata + (filled + me_x) + (height - me_y) * width;
+ me_plane = refdata + (filled + me_x) + (height - me_y) * stride;
for(j = 0; j < me_h; j++) {
for(i = 0; i < me_w; i++)
- dst[filled + i - (j * stride)] = me_plane[i - (j * width)];
+ dst[filled + i - (j * stride)] = me_plane[i - (j * stride)];
}
}
}
@@ -191,17 +193,24 @@ static void qpeg_decode_inter(QpegContext *qctx, uint8_t *dst,
filled = 0;
dst -= stride;
height--;
+ if(height < 0)
+ break;
}
}
} else if(code >= 0xC0) { /* copy code: 0xC0..0xDF */
code &= 0x1F;
+ if(code + 1 > bytestream2_get_bytes_left(&qctx->buffer))
+ break;
+
for(i = 0; i <= code; i++) {
dst[filled++] = bytestream2_get_byte(&qctx->buffer);
if(filled >= width) {
filled = 0;
dst -= stride;
height--;
+ if(height < 0)
+ break;
}
}
} else if(code >= 0x80) { /* skip code: 0x80..0xBF */
@@ -246,7 +255,8 @@ static int decode_frame(AVCodecContext *avctx,
{
uint8_t ctable[128];
QpegContext * const a = avctx->priv_data;
- AVFrame * const p = &a->pic;
+ AVFrame * p = &a->pic;
+ AVFrame * ref= &a->ref;
uint8_t* outdata;
int delta, ret;
const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, NULL);
@@ -257,10 +267,12 @@ static int decode_frame(AVCodecContext *avctx,
}
bytestream2_init(&a->buffer, avpkt->data, avpkt->size);
- if ((ret = ff_reget_buffer(avctx, p)) < 0) {
- av_log(avctx, AV_LOG_ERROR, "reget_buffer() failed\n");
+
+ av_frame_unref(ref);
+ av_frame_move_ref(ref, p);
+
+ if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0)
return ret;
- }
outdata = a->pic.data[0];
bytestream2_skip(&a->buffer, 4);
bytestream2_get_buffer(&a->buffer, ctable, 128);
@@ -270,7 +282,7 @@ static int decode_frame(AVCodecContext *avctx,
if(delta == 0x10) {
qpeg_decode_intra(a, outdata, a->pic.linesize[0], avctx->width, avctx->height);
} else {
- qpeg_decode_inter(a, outdata, a->pic.linesize[0], avctx->width, avctx->height, delta, ctable, a->refdata);
+ qpeg_decode_inter(a, outdata, a->pic.linesize[0], avctx->width, avctx->height, delta, ctable, a->ref.data[0]);
}
/* make the palette available on the way out */
@@ -288,12 +300,27 @@ static int decode_frame(AVCodecContext *avctx,
return avpkt->size;
}
+static void decode_flush(AVCodecContext *avctx){
+ QpegContext * const a = avctx->priv_data;
+ int i, pal_size;
+ const uint8_t *pal_src;
+
+ pal_size = FFMIN(1024U, avctx->extradata_size);
+ pal_src = avctx->extradata + avctx->extradata_size - pal_size;
+
+ for (i=0; i<pal_size/4; i++)
+ a->pal[i] = 0xFFU<<24 | AV_RL32(pal_src+4*i);
+}
+
static av_cold int decode_init(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
+ avcodec_get_frame_defaults(&a->pic);
+ avcodec_get_frame_defaults(&a->ref);
a->avctx = avctx;
avctx->pix_fmt= AV_PIX_FMT_PAL8;
- a->refdata = av_malloc(avctx->width * avctx->height);
+
+ decode_flush(avctx);
avcodec_get_frame_defaults(&a->pic);
@@ -303,10 +330,11 @@ static av_cold int decode_init(AVCodecContext *avctx){
static av_cold int decode_end(AVCodecContext *avctx){
QpegContext * const a = avctx->priv_data;
AVFrame * const p = &a->pic;
+ AVFrame * const ref= &a->ref;
av_frame_unref(p);
+ av_frame_unref(ref);
- av_free(a->refdata);
return 0;
}
@@ -318,6 +346,7 @@ AVCodec ff_qpeg_decoder = {
.init = decode_init,
.close = decode_end,
.decode = decode_frame,
+ .flush = decode_flush,
.capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("Q-team QPEG"),
};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-09 15:57:47 +0000