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![Vittorio Giovara](/assets/img/avatar_default.png)
FFv1 uses two types of coders, golomb and range with two different tables. This is exposed this in a rather convoluted way, for example mentioning to set coder type 1 while initializing the variable 'ac' to 2, because encoder does not use range coder with default table. Appropriate internal coder type values have been added and used in any check rather than using raw numbers. Initialization of avctx.coder_type in ffv1dec is removed because this field is encoder only. An unneeded validation check in the encoder is dropped too. Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>
209 lines
5.4 KiB
C
209 lines
5.4 KiB
C
/*
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* FFV1 codec for libavcodec
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*
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* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVCODEC_FFV1_H
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#define AVCODEC_FFV1_H
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#include <stdint.h>
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#include "avcodec.h"
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#include "get_bits.h"
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#include "put_bits.h"
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#include "rangecoder.h"
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#define MAX_PLANES 4
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#define CONTEXT_SIZE 32
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#define MAX_QUANT_TABLES 8
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#define MAX_CONTEXT_INPUTS 5
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#define AC_GOLOMB_RICE 0
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#define AC_RANGE_DEFAULT_TAB 1
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#define AC_RANGE_CUSTOM_TAB 2
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extern const uint8_t ff_log2_run[41];
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extern const int8_t ffv1_quant5_10bit[256];
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extern const int8_t ffv1_quant5[256];
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extern const int8_t ffv1_quant9_10bit[256];
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extern const int8_t ffv1_quant11[256];
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extern const uint8_t ffv1_ver2_state[256];
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typedef struct VlcState {
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int16_t drift;
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uint16_t error_sum;
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int8_t bias;
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uint8_t count;
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} VlcState;
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typedef struct PlaneContext {
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int16_t quant_table[MAX_CONTEXT_INPUTS][256];
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int quant_table_index;
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int context_count;
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uint8_t (*state)[CONTEXT_SIZE];
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VlcState *vlc_state;
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uint8_t interlace_bit_state[2];
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} PlaneContext;
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#define MAX_SLICES 256
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typedef struct FFV1Context {
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AVClass *class;
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AVCodecContext *avctx;
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RangeCoder c;
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GetBitContext gb;
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PutBitContext pb;
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uint64_t rc_stat[256][2];
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uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
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int version;
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int minor_version;
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int width, height;
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int chroma_planes;
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int chroma_h_shift, chroma_v_shift;
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int transparency;
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int flags;
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int picture_number;
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int key_frame;
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const AVFrame *frame;
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AVFrame *last_picture;
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AVFrame *cur;
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int plane_count;
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int ac; // 1 = range coder <-> 0 = golomb rice
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int ac_byte_count; // number of bytes used for AC coding
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PlaneContext plane[MAX_PLANES];
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int16_t quant_table[MAX_CONTEXT_INPUTS][256];
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int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
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int context_count[MAX_QUANT_TABLES];
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uint8_t state_transition[256];
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uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
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int run_index;
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int colorspace;
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int16_t *sample_buffer;
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int ec;
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int slice_damaged;
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int key_frame_ok;
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int bits_per_raw_sample;
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int packed_at_lsb;
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int gob_count;
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int quant_table_count;
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struct FFV1Context *slice_context[MAX_SLICES];
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int slice_count;
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int num_v_slices;
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int num_h_slices;
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int slice_width;
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int slice_height;
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int slice_x;
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int slice_y;
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} FFV1Context;
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static av_always_inline int fold(int diff, int bits)
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{
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if (bits == 8)
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diff = (int8_t)diff;
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else {
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diff += 1 << (bits - 1);
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diff &= (1 << bits) - 1;
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diff -= 1 << (bits - 1);
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}
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return diff;
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}
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static inline int predict(int16_t *src, int16_t *last)
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{
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const int LT = last[-1];
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const int T = last[0];
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const int L = src[-1];
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return mid_pred(L, L + T - LT, T);
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}
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static inline int get_context(PlaneContext *p, int16_t *src,
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int16_t *last, int16_t *last2)
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{
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const int LT = last[-1];
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const int T = last[0];
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const int RT = last[1];
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const int L = src[-1];
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if (p->quant_table[3][127]) {
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const int TT = last2[0];
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const int LL = src[-2];
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return p->quant_table[0][(L - LT) & 0xFF] +
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p->quant_table[1][(LT - T) & 0xFF] +
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p->quant_table[2][(T - RT) & 0xFF] +
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p->quant_table[3][(LL - L) & 0xFF] +
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p->quant_table[4][(TT - T) & 0xFF];
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} else
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return p->quant_table[0][(L - LT) & 0xFF] +
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p->quant_table[1][(LT - T) & 0xFF] +
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p->quant_table[2][(T - RT) & 0xFF];
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}
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static inline void update_vlc_state(VlcState *const state, const int v)
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{
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int drift = state->drift;
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int count = state->count;
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state->error_sum += FFABS(v);
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drift += v;
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if (count == 128) { // FIXME: variable
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count >>= 1;
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drift >>= 1;
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state->error_sum >>= 1;
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}
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count++;
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if (drift <= -count) {
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if (state->bias > -128)
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state->bias--;
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drift += count;
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if (drift <= -count)
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drift = -count + 1;
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} else if (drift > 0) {
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if (state->bias < 127)
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state->bias++;
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drift -= count;
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if (drift > 0)
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drift = 0;
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}
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state->drift = drift;
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state->count = count;
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}
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int ffv1_common_init(AVCodecContext *avctx);
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int ffv1_init_slice_state(FFV1Context *f, FFV1Context *fs);
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int ffv1_init_slice_contexts(FFV1Context *f);
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int ffv1_allocate_initial_states(FFV1Context *f);
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void ffv1_clear_slice_state(FFV1Context *f, FFV1Context *fs);
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int ffv1_close(AVCodecContext *avctx);
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#endif /* AVCODEC_FFV1_H */
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