* Lagarith lossless decoder
* Copyright (c) 2009 Nathan Caldwell <saintdev (at) gmail.com>
*
- * 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
*/
}
}
+static void lag_pred_line_yuy2(LagarithContext *l, uint8_t *buf,
+ int width, int stride, int line,
+ int is_luma)
+{
+ int L, TL;
+
+ if (!line) {
+ if (is_luma) {
+ buf++;
+ width--;
+ }
+ l->dsp.add_hfyu_left_prediction(buf + 1, buf + 1, width - 1, buf[0]);
+ return;
+ }
+ if (line == 1) {
+ const int HEAD = is_luma ? 4 : 2;
+ int i;
+
+ L = buf[width - stride - 1];
+ TL = buf[HEAD - stride - 1];
+ for (i = 0; i < HEAD; i++) {
+ L += buf[i];
+ buf[i] = L;
+ }
+ buf += HEAD;
+ width -= HEAD;
+ } else {
+ TL = buf[width - (2 * stride) - 1];
+ L = buf[width - stride - 1];
+ }
+ l->dsp.add_hfyu_median_prediction(buf, buf - stride, buf, width,
+ &L, &TL);
+}
+
static int lag_decode_line(LagarithContext *l, lag_rac *rac,
uint8_t *dst, int width, int stride,
int esc_count)
output_zeros:
if (l->zeros_rem) {
count = FFMIN(l->zeros_rem, width - i);
+ if(end - dst < count) {
+ av_log(l->avctx, AV_LOG_ERROR, "too many zeros remaining\n");
+ return AVERROR_INVALIDDATA;
+ }
memset(dst, 0, count);
l->zeros_rem -= count;
dst += count;
i = 0;
while (!zero_run && dst + i < end) {
i++;
- if (src + i >= src_end)
+ if (i+2 >= src_end - src)
return AVERROR_INVALIDDATA;
zero_run =
!(src[i] | (src[i + 1] & mask1) | (src[i + 2] & mask2));
dst += i;
}
}
- return src_start - src;
+ return src - src_start;
}
int read = 0;
uint32_t length;
uint32_t offset = 1;
- int esc_count = src[0];
+ int esc_count;
GetBitContext gb;
lag_rac rac;
const uint8_t *src_end = src + src_size;
rac.avctx = l->avctx;
l->zeros = 0;
+ if(src_size < 2)
+ return AVERROR_INVALIDDATA;
+
+ esc_count = src[0];
if (esc_count < 4) {
length = width * height;
+ if(src_size < 5)
+ return AVERROR_INVALIDDATA;
if (esc_count && AV_RL32(src + 1) < length) {
length = AV_RL32(src + 1);
offset += 4;
return -1;
}
- for (i = 0; i < height; i++) {
- lag_pred_line(l, dst, width, stride, i);
- dst += stride;
+ if (l->avctx->pix_fmt != PIX_FMT_YUV422P) {
+ for (i = 0; i < height; i++) {
+ lag_pred_line(l, dst, width, stride, i);
+ dst += stride;
+ }
+ } else {
+ for (i = 0; i < height; i++) {
+ lag_pred_line_yuy2(l, dst, width, stride, i,
+ width == l->avctx->width);
+ dst += stride;
+ }
}
return 0;
void *data, int *data_size, AVPacket *avpkt)
{
const uint8_t *buf = avpkt->data;
- int buf_size = avpkt->size;
+ unsigned int buf_size = avpkt->size;
LagarithContext *l = avctx->priv_data;
AVFrame *const p = &l->picture;
uint8_t frametype = 0;
uint32_t offset_gu = 0, offset_bv = 0, offset_ry = 9;
- int offs[4];
+ uint32_t offs[4];
uint8_t *srcs[4], *dst;
int i, j, planes = 3;
offset_ry += 4;
offs[3] = AV_RL32(buf + 9);
case FRAME_ARITH_RGB24:
- if (frametype == FRAME_ARITH_RGB24)
+ case FRAME_U_RGB24:
+ if (frametype == FRAME_ARITH_RGB24 || frametype == FRAME_U_RGB24)
avctx->pix_fmt = PIX_FMT_RGB24;
if (avctx->get_buffer(avctx, p) < 0) {
if (!l->rgb_planes) {
l->rgb_stride = FFALIGN(avctx->width, 16);
- l->rgb_planes = av_malloc(l->rgb_stride * avctx->height * planes);
+ l->rgb_planes = av_malloc(l->rgb_stride * avctx->height * planes + 16);
if (!l->rgb_planes) {
av_log(avctx, AV_LOG_ERROR, "cannot allocate temporary buffer\n");
return AVERROR(ENOMEM);
}
for (i = 0; i < planes; i++)
srcs[i] = l->rgb_planes + (i + 1) * l->rgb_stride * avctx->height - l->rgb_stride;
- if (offset_ry >= buf_size ||
- offset_gu >= buf_size ||
- offset_bv >= buf_size ||
- (planes == 4 && offs[3] >= buf_size)) {
- av_log(avctx, AV_LOG_ERROR,
- "Invalid frame offsets\n");
- return AVERROR_INVALIDDATA;
- }
+ for (i = 0; i < planes; i++)
+ if (buf_size <= offs[i]) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid frame offsets\n");
+ return AVERROR_INVALIDDATA;
+ }
+
for (i = 0; i < planes; i++)
lag_decode_arith_plane(l, srcs[i],
avctx->width, avctx->height,
srcs[i] += l->rgb_stride;
}
break;
+ case FRAME_ARITH_YUY2:
+ avctx->pix_fmt = PIX_FMT_YUV422P;
+
+ if (avctx->get_buffer(avctx, p) < 0) {
+ av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
+ return -1;
+ }
+
+ if (offset_ry >= buf_size ||
+ offset_gu >= buf_size ||
+ offset_bv >= buf_size) {
+ av_log(avctx, AV_LOG_ERROR,
+ "Invalid frame offsets\n");
+ return AVERROR_INVALIDDATA;
+ }
+
+ lag_decode_arith_plane(l, p->data[0], avctx->width, avctx->height,
+ p->linesize[0], buf + offset_ry,
+ buf_size - offset_ry);
+ lag_decode_arith_plane(l, p->data[1], avctx->width / 2,
+ avctx->height, p->linesize[1],
+ buf + offset_gu, buf_size - offset_gu);
+ lag_decode_arith_plane(l, p->data[2], avctx->width / 2,
+ avctx->height, p->linesize[2],
+ buf + offset_bv, buf_size - offset_bv);
+ break;
case FRAME_ARITH_YV12:
avctx->pix_fmt = PIX_FMT_YUV420P;
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
+ if (buf_size <= offset_ry || buf_size <= offset_gu || buf_size <= offset_bv) {
+ return AVERROR_INVALIDDATA;
+ }
if (offset_ry >= buf_size ||
offset_gu >= buf_size ||
.close = lag_decode_end,
.decode = lag_decode_frame,
.capabilities = CODEC_CAP_DR1,
- .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
+ .long_name = NULL_IF_CONFIG_SMALL("Lagarith lossless"),
};
projects / ffmpeg / blobdiff