/**
- * @file vp6.c
+ * @file
* VP6 compatible video decoder
*
* Copyright (C) 2006 Aurelien Jacobs <aurel@gnuage.org>
* - 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
*/
#include "avcodec.h"
#include "dsputil.h"
-#include "bitstream.h"
-#include "mpegvideo.h"
+#include "get_bits.h"
+#include "huffman.h"
#include "vp56.h"
#include "vp56data.h"
#include "vp6data.h"
+#define VP6_MAX_HUFF_SIZE 12
-static int vp6_parse_header(vp56_context_t *s, uint8_t *buf, int buf_size,
+static void vp6_parse_coeff(VP56Context *s);
+static void vp6_parse_coeff_huffman(VP56Context *s);
+
+static int vp6_parse_header(VP56Context *s, const uint8_t *buf, int buf_size,
int *golden_frame)
{
- vp56_range_coder_t *c = &s->c;
+ VP56RangeCoder *c = &s->c;
int parse_filter_info = 0;
int coeff_offset = 0;
int vrt_shift = 0;
int separated_coeff = buf[0] & 1;
s->framep[VP56_FRAME_CURRENT]->key_frame = !(buf[0] & 0x80);
- vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
+ ff_vp56_init_dequant(s, (buf[0] >> 1) & 0x3F);
if (s->framep[VP56_FRAME_CURRENT]->key_frame) {
sub_version = buf[1] >> 3;
/* buf[4] is number of displayed macroblock rows */
/* buf[5] is number of displayed macroblock cols */
- if (16*cols != s->avctx->coded_width ||
+ if (!s->macroblocks || /* first frame */
+ 16*cols != s->avctx->coded_width ||
16*rows != s->avctx->coded_height) {
avcodec_set_dimensions(s->avctx, 16*cols, 16*rows);
if (s->avctx->extradata_size == 1) {
res = 2;
}
- vp56_init_range_decoder(c, buf+6, buf_size-6);
+ ff_vp56_init_range_decoder(c, buf+6, buf_size-6);
vp56_rac_gets(c, 2);
parse_filter_info = s->filter_header;
buf += 2;
buf_size -= 2;
}
- vp56_init_range_decoder(c, buf+1, buf_size-1);
+ ff_vp56_init_range_decoder(c, buf+1, buf_size-1);
*golden_frame = vp56_rac_get(c);
if (s->filter_header) {
s->filter_selection = 16;
}
- if (vp56_rac_get(c))
- av_log(s->avctx, AV_LOG_WARNING,
- "alternative entropy decoding not supported\n");
+ s->use_huffman = vp56_rac_get(c);
+ s->parse_coeff = vp6_parse_coeff;
if (coeff_offset) {
- vp56_init_range_decoder(&s->cc, buf+coeff_offset,
- buf_size-coeff_offset);
- s->ccp = &s->cc;
+ buf += coeff_offset;
+ buf_size -= coeff_offset;
+ if (buf_size < 0)
+ return 0;
+ if (s->use_huffman) {
+ s->parse_coeff = vp6_parse_coeff_huffman;
+ init_get_bits(&s->gb, buf, buf_size<<3);
+ } else {
+ ff_vp56_init_range_decoder(&s->cc, buf, buf_size);
+ s->ccp = &s->cc;
+ }
} else {
s->ccp = &s->c;
}
return res;
}
-static void vp6_coeff_order_table_init(vp56_context_t *s)
+static void vp6_coeff_order_table_init(VP56Context *s)
{
int i, pos, idx = 1;
s->modelp->coeff_index_to_pos[idx++] = pos;
}
-static void vp6_default_models_init(vp56_context_t *s)
+static void vp6_default_models_init(VP56Context *s)
{
- vp56_model_t *model = s->modelp;
+ VP56Model *model = s->modelp;
model->vector_dct[0] = 0xA2;
model->vector_dct[1] = 0xA4;
vp6_coeff_order_table_init(s);
}
-static void vp6_parse_vector_models(vp56_context_t *s)
+static void vp6_parse_vector_models(VP56Context *s)
{
- vp56_range_coder_t *c = &s->c;
- vp56_model_t *model = s->modelp;
+ VP56RangeCoder *c = &s->c;
+ VP56Model *model = s->modelp;
int comp, node;
for (comp=0; comp<2; comp++) {
model->vector_fdv[comp][node] = vp56_rac_gets_nn(c, 7);
}
-static void vp6_parse_coeff_models(vp56_context_t *s)
+/* nodes must ascend by count, but with descending symbol order */
+static int vp6_huff_cmp(const void *va, const void *vb)
{
- vp56_range_coder_t *c = &s->c;
- vp56_model_t *model = s->modelp;
+ const Node *a = va, *b = vb;
+ 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)
+{
+ Node nodes[2*VP6_MAX_HUFF_SIZE], *tmp = &nodes[size];
+ int a, b, i;
+
+ /* first compute probabilities from model */
+ tmp[0].count = 256;
+ for (i=0; i<size-1; i++) {
+ a = tmp[i].count * coeff_model[i] >> 8;
+ b = tmp[i].count * (255 - coeff_model[i]) >> 8;
+ nodes[map[2*i ]].count = a + !a;
+ nodes[map[2*i+1]].count = b + !b;
+ }
+
+ 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);
+}
+
+static void vp6_parse_coeff_models(VP56Context *s)
+{
+ VP56RangeCoder *c = &s->c;
+ VP56Model *model = s->modelp;
int def_prob[11];
int node, cg, ctx, pos;
int ct; /* code type */
model->coeff_ract[pt][ct][cg][node] = def_prob[node];
}
+ 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]);
+ 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]);
+ }
+ memset(s->nb_null, 0, sizeof(s->nb_null));
+ } else {
/* coeff_dcct is a linear combination of coeff_dccv */
for (pt=0; pt<2; pt++)
for (ctx=0; ctx<3; ctx++)
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);
+ }
}
-static void vp6_parse_vector_adjustment(vp56_context_t *s, vp56_mv_t *vect)
+static void vp6_parse_vector_adjustment(VP56Context *s, VP56mv *vect)
{
- vp56_range_coder_t *c = &s->c;
- vp56_model_t *model = s->modelp;
+ VP56RangeCoder *c = &s->c;
+ VP56Model *model = s->modelp;
int comp;
- *vect = (vp56_mv_t) {0,0};
+ *vect = (VP56mv) {0,0};
if (s->vector_candidate_pos < 2)
*vect = s->vector_candidate[0];
}
}
-static void vp6_parse_coeff(vp56_context_t *s)
+/**
+ * Read number of consecutive blocks with null DC or AC.
+ * This value is < 74.
+ */
+static unsigned vp6_get_nb_null(VP56Context *s)
+{
+ unsigned val = get_bits(&s->gb, 2);
+ if (val == 2)
+ val += get_bits(&s->gb, 2);
+ else if (val == 3) {
+ val = get_bits1(&s->gb) << 2;
+ val = 6+val + get_bits(&s->gb, 2+val);
+ }
+ return val;
+}
+
+static void vp6_parse_coeff_huffman(VP56Context *s)
+{
+ VP56Model *model = s->modelp;
+ uint8_t *permute = s->scantable.permutated;
+ VLC *vlc_coeff;
+ int coeff, sign, coeff_idx;
+ int b, cg, idx;
+ int pt = 0; /* plane type (0 for Y, 1 for U or V) */
+
+ for (b=0; b<6; b++) {
+ int ct = 0; /* code type */
+ if (b > 3) pt = 1;
+ vlc_coeff = &s->dccv_vlc[pt];
+
+ for (coeff_idx=0; coeff_idx<64; ) {
+ int run = 1;
+ if (coeff_idx<2 && s->nb_null[coeff_idx][pt]) {
+ s->nb_null[coeff_idx][pt]--;
+ if (coeff_idx)
+ break;
+ } else {
+ if (get_bits_count(&s->gb) >= s->gb.size_in_bits)
+ return;
+ coeff = get_vlc2(&s->gb, vlc_coeff->table, 9, 3);
+ if (coeff == 0) {
+ if (coeff_idx) {
+ int pt = (coeff_idx >= 6);
+ run += get_vlc2(&s->gb, s->runv_vlc[pt].table, 9, 3);
+ if (run >= 9)
+ run += get_bits(&s->gb, 6);
+ } else
+ s->nb_null[0][pt] = vp6_get_nb_null(s);
+ ct = 0;
+ } else if (coeff == 11) { /* end of block */
+ if (coeff_idx == 1) /* first AC coeff ? */
+ s->nb_null[1][pt] = vp6_get_nb_null(s);
+ break;
+ } else {
+ int coeff2 = vp56_coeff_bias[coeff];
+ if (coeff > 4)
+ coeff2 += get_bits(&s->gb, coeff <= 9 ? coeff - 4 : 11);
+ ct = 1 + (coeff2 > 1);
+ sign = get_bits1(&s->gb);
+ coeff2 = (coeff2 ^ -sign) + sign;
+ if (coeff_idx)
+ coeff2 *= s->dequant_ac;
+ idx = model->coeff_index_to_pos[coeff_idx];
+ s->block_coeff[b][permute[idx]] = coeff2;
+ }
+ }
+ coeff_idx+=run;
+ cg = FFMIN(vp6_coeff_groups[coeff_idx], 3);
+ vlc_coeff = &s->ract_vlc[pt][ct][cg];
+ }
+ }
+}
+
+static void vp6_parse_coeff(VP56Context *s)
{
- vp56_range_coder_t *c = s->ccp;
- vp56_model_t *model = s->modelp;
+ VP56RangeCoder *c = s->ccp;
+ VP56Model *model = s->modelp;
uint8_t *permute = s->scantable.permutated;
uint8_t *model1, *model2, *model3;
int coeff, sign, coeff_idx;
if (vp56_rac_get_prob(c, model2[2])) {
if (vp56_rac_get_prob(c, model2[3])) {
idx = vp56_rac_get_tree(c, vp56_pc_tree, model1);
- coeff = vp56_coeff_bias[idx];
+ coeff = vp56_coeff_bias[idx+5];
for (i=vp56_coeff_bit_length[idx]; i>=0; i--)
coeff += vp56_rac_get_prob(c, vp56_coeff_parse_table[idx][i]) << i;
} else {
}
}
-static int vp6_adjust(int v, int t)
-{
- int V = v, s = v >> 31;
- V ^= s;
- V -= s;
- if (V-t-1 >= (unsigned)(t-1))
- return v;
- V = 2*t - V;
- V += s;
- V ^= s;
- return V;
-}
-
static int vp6_block_variance(uint8_t *src, int stride)
{
int sum = 0, square_sum = 0;
}
}
-static void vp6_filter_diag2(vp56_context_t *s, uint8_t *dst, uint8_t *src,
+static void vp6_filter_diag2(VP56Context *s, uint8_t *dst, uint8_t *src,
int stride, int h_weight, int v_weight)
{
uint8_t *tmp = s->edge_emu_buffer+16;
s->dsp.put_h264_chroma_pixels_tab[0](dst, tmp, stride, 8, 0, v_weight);
}
-static void vp6_filter_diag4(uint8_t *dst, uint8_t *src, int stride,
- const int16_t *h_weights,const int16_t *v_weights)
-{
- int x, y;
- int tmp[8*11];
- int *t = tmp;
-
- src -= stride;
-
- for (y=0; y<11; y++) {
- for (x=0; x<8; x++) {
- t[x] = av_clip_uint8(( src[x-1] * h_weights[0]
- + src[x ] * h_weights[1]
- + src[x+1] * h_weights[2]
- + src[x+2] * h_weights[3] + 64) >> 7);
- }
- src += stride;
- t += 8;
- }
-
- t = tmp + 8;
- for (y=0; y<8; y++) {
- for (x=0; x<8; x++) {
- dst[x] = av_clip_uint8(( t[x-8 ] * v_weights[0]
- + t[x ] * v_weights[1]
- + t[x+8 ] * v_weights[2]
- + t[x+16] * v_weights[3] + 64) >> 7);
- }
- dst += stride;
- t += 8;
- }
-}
-
-static void vp6_filter(vp56_context_t *s, uint8_t *dst, uint8_t *src,
+static void vp6_filter(VP56Context *s, uint8_t *dst, uint8_t *src,
int offset1, int offset2, int stride,
- vp56_mv_t mv, int mask, int select, int luma)
+ VP56mv mv, int mask, int select, int luma)
{
int filter4 = 0;
int x8 = mv.x & mask;
vp6_filter_hv4(dst, src+offset1, stride, stride,
vp6_block_copy_filter[select][y8]);
} else {
- vp6_filter_diag4(dst, src+offset1 + ((mv.x^mv.y)>>31), stride,
+ s->vp56dsp.vp6_filter_diag4(dst, src+offset1+((mv.x^mv.y)>>31), stride,
vp6_block_copy_filter[select][x8],
vp6_block_copy_filter[select][y8]);
}
}
}
-static int vp6_decode_init(AVCodecContext *avctx)
+static av_cold int vp6_decode_init(AVCodecContext *avctx)
{
- vp56_context_t *s = avctx->priv_data;
+ VP56Context *s = avctx->priv_data;
- vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
- avctx->codec->id == CODEC_ID_VP6A);
+ ff_vp56_init(avctx, avctx->codec->id == CODEC_ID_VP6,
+ avctx->codec->id == CODEC_ID_VP6A);
s->vp56_coord_div = vp6_coord_div;
s->parse_vector_adjustment = vp6_parse_vector_adjustment;
- s->adjust = vp6_adjust;
s->filter = vp6_filter;
- s->parse_coeff = vp6_parse_coeff;
s->default_models_init = vp6_default_models_init;
s->parse_vector_models = vp6_parse_vector_models;
s->parse_coeff_models = vp6_parse_coeff_models;
return 0;
}
-AVCodec vp6_decoder = {
+static av_cold int vp6_decode_free(AVCodecContext *avctx)
+{
+ VP56Context *s = avctx->priv_data;
+ int pt, ct, cg;
+
+ ff_vp56_free(avctx);
+
+ for (pt=0; pt<2; pt++) {
+ free_vlc(&s->dccv_vlc[pt]);
+ free_vlc(&s->runv_vlc[pt]);
+ for (ct=0; ct<3; ct++)
+ for (cg=0; cg<6; cg++)
+ free_vlc(&s->ract_vlc[pt][ct][cg]);
+ }
+ return 0;
+}
+
+AVCodec ff_vp6_decoder = {
"vp6",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_VP6,
- sizeof(vp56_context_t),
+ sizeof(VP56Context),
vp6_decode_init,
NULL,
- vp56_free,
- vp56_decode_frame,
+ vp6_decode_free,
+ ff_vp56_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("On2 VP6"),
};
/* flash version, not flipped upside-down */
-AVCodec vp6f_decoder = {
+AVCodec ff_vp6f_decoder = {
"vp6f",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_VP6F,
- sizeof(vp56_context_t),
+ sizeof(VP56Context),
vp6_decode_init,
NULL,
- vp56_free,
- vp56_decode_frame,
+ vp6_decode_free,
+ ff_vp56_decode_frame,
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 = {
+AVCodec ff_vp6a_decoder = {
"vp6a",
- CODEC_TYPE_VIDEO,
+ AVMEDIA_TYPE_VIDEO,
CODEC_ID_VP6A,
- sizeof(vp56_context_t),
+ sizeof(VP56Context),
vp6_decode_init,
NULL,
- vp56_free,
- vp56_decode_frame,
+ vp6_decode_free,
+ ff_vp56_decode_frame,
CODEC_CAP_DR1,
+ .long_name = NULL_IF_CONFIG_SMALL("On2 VP6 (Flash version, with alpha channel)"),
};
projects / ffmpeg / blobdiff