-/**
- * @file
- * VP6 compatible video decoder
- *
+/*
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
*
- * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
- * - upper 4bits: difference between encoded width and visible width
- * - lower 4bits: difference between encoded height and visible height
- *
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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.
*
- * FFmpeg is distributed in the hope that it will be useful,
+ * Libav 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 FFmpeg; if not, write to the Free Software
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
+/**
+ * @file
+ * VP6 compatible video decoder
+ *
+ * The VP6F decoder accepts an optional 1 byte extradata. It is composed of:
+ * - upper 4 bits: difference between encoded width and visible width
+ * - lower 4 bits: difference between encoded height and visible height
+ */
+
#include <stdlib.h>
#include "avcodec.h"
if (coeff_offset) {
buf += coeff_offset;
buf_size -= coeff_offset;
- if (buf_size < 0)
+ if (buf_size < 0) {
+ if (s->framep[VP56_FRAME_CURRENT]->key_frame)
+ avcodec_set_dimensions(s->avctx, 0, 0);
return 0;
+ }
if (s->use_huffman) {
s->parse_coeff = vp6_parse_coeff_huffman;
init_get_bits(&s->gb, buf, buf_size<<3);
return (a->count - b->count)*16 + (b->sym - a->sym);
}
-static void vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
- const uint8_t *map, unsigned size, VLC *vlc)
+static int vp6_build_huff_tree(VP56Context *s, uint8_t coeff_model[],
+ const uint8_t *map, unsigned size, VLC *vlc)
{
Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
int a, b, i;
}
free_vlc(vlc);
- /* then build the huffman tree accodring to probabilities */
- ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
- FF_HUFFMAN_FLAG_HNODE_FIRST);
+ /* then build the huffman tree according to probabilities */
+ return ff_huff_build_tree(s->avctx, vlc, size, nodes, vp6_huff_cmp,
+ FF_HUFFMAN_FLAG_HNODE_FIRST);
}
-static void vp6_parse_coeff_models(VP56Context *s)
+static int vp6_parse_coeff_models(VP56Context *s)
{
VP56RangeCoder *c = &s->c;
VP56Model *model = s->modelp;
if (s->use_huffman) {
for (pt=0; pt<2; pt++) {
- vp6_build_huff_tree(s, model->coeff_dccv[pt],
- vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]);
- vp6_build_huff_tree(s, model->coeff_runv[pt],
- vp6_huff_run_map, 9, &s->runv_vlc[pt]);
+ if (vp6_build_huff_tree(s, model->coeff_dccv[pt],
+ vp6_huff_coeff_map, 12, &s->dccv_vlc[pt]))
+ return -1;
+ if (vp6_build_huff_tree(s, model->coeff_runv[pt],
+ vp6_huff_run_map, 9, &s->runv_vlc[pt]))
+ return -1;
for (ct=0; ct<3; ct++)
for (cg = 0; cg < 6; cg++)
- vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
- vp6_huff_coeff_map, 12,
- &s->ract_vlc[pt][ct][cg]);
+ if (vp6_build_huff_tree(s, model->coeff_ract[pt][ct][cg],
+ vp6_huff_coeff_map, 12,
+ &s->ract_vlc[pt][ct][cg]))
+ return -1;
}
memset(s->nb_null, 0, sizeof(s->nb_null));
} else {
for (node=0; node<5; node++)
model->coeff_dcct[pt][ctx][node] = av_clip(((model->coeff_dccv[pt][node] * vp6_dccv_lc[ctx][node][0] + 128) >> 8) + vp6_dccv_lc[ctx][node][1], 1, 255);
}
+ return 0;
}
static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
if (b > 3) pt = 1;
vlc_coeff = &s->dccv_vlc[pt];
- for (coeff_idx=0; coeff_idx<64; ) {
+ for (coeff_idx = 0;;) {
int run = 1;
if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
s->nb_null[coeff_idx][pt]--;
}
}
coeff_idx+=run;
+ if (coeff_idx >= 64)
+ break;
cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
vlc_coeff = &s->ract_vlc[pt][ct][cg];
}
model1 = model->coeff_dccv[pt];
model2 = model->coeff_dcct[pt][ctx];
- for (coeff_idx=0; coeff_idx<64; ) {
+ coeff_idx = 0;
+ for (;;) {
if ((coeff_idx>1 && ct==0) || vp56_rac_get_prob(c, model2[0])) {
/* parse a coeff */
if (vp56_rac_get_prob(c, model2[2])) {
run += vp56_rac_get_prob(c, model3[i+8]) << i;
}
}
-
- cg = vp6_coeff_groups[coeff_idx+=run];
+ coeff_idx += run;
+ if (coeff_idx >= 64)
+ break;
+ cg = vp6_coeff_groups[coeff_idx];
model1 = model2 = model->coeff_ract[pt][ct][cg];
}
return 0;
}
-AVCodec vp6_decoder = {
- "vp6",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_VP6,
- sizeof(VP56Context),
- vp6_decode_init,
- NULL,
- vp6_decode_free,
- ff_vp56_decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_vp6_decoder = {
+ .name = "vp6",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_VP6,
+ .priv_data_size = sizeof(VP56Context),
+ .init = vp6_decode_init,
+ .close = vp6_decode_free,
+ .decode = ff_vp56_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
};
/* flash version, not flipped upside-down */
-AVCodec vp6f_decoder = {
- "vp6f",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_VP6F,
- sizeof(VP56Context),
- vp6_decode_init,
- NULL,
- vp6_decode_free,
- ff_vp56_decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_vp6f_decoder = {
+ .name = "vp6f",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_VP6F,
+ .priv_data_size = sizeof(VP56Context),
+ .init = vp6_decode_init,
+ .close = vp6_decode_free,
+ .decode = ff_vp56_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version)"),
};
/* flash version, not flipped upside-down, with alpha channel */
-AVCodec vp6a_decoder = {
- "vp6a",
- AVMEDIA_TYPE_VIDEO,
- CODEC_ID_VP6A,
- sizeof(VP56Context),
- vp6_decode_init,
- NULL,
- vp6_decode_free,
- ff_vp56_decode_frame,
- CODEC_CAP_DR1,
+AVCodec ff_vp6a_decoder = {
+ .name = "vp6a",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .id = CODEC_ID_VP6A,
+ .priv_data_size = sizeof(VP56Context),
+ .init = vp6_decode_init,
+ .close = vp6_decode_free,
+ .decode = ff_vp56_decode_frame,
+ .capabilities = CODEC_CAP_DR1,
.long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
};