ffv1: split decoder and encoder

1 files changed, 12 insertions, 1600 deletions

diff --git a/libavcodec/ffv1.c b/libavcodec/ffv1.c
index f290b940e8..9dfaecb816 100644
--- a/libavcodec/ffv1.c
+++ b/libavcodec/ffv1.c
@@ -33,16 +33,9 @@
 #include "rangecoder.h"
 #include "golomb.h"
 #include "mathops.h"
+#include "ffv1.h"
 
-#define MAX_PLANES 4
-#define CONTEXT_SIZE 32
-
-#define MAX_QUANT_TABLES 8
-#define MAX_CONTEXT_INPUTS 5
-
-extern const uint8_t ff_log2_run[41];
-
-static const int8_t quant5_10bit[256] = {
+const int8_t ffv1_quant5_10bit[256] = {
      0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  0,  1,  1,  1,  1,  1,
      1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
      1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,  1,
@@ -61,7 +54,7 @@ static const int8_t quant5_10bit[256] = {
     -1, -1, -1, -1, -1, -1, -0, -0, -0, -0, -0, -0, -0, -0, -0, -0,
 };
 
-static const int8_t quant5[256] = {
+const int8_t ffv1_quant5[256] = {
      0,  1,  1,  1,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,
@@ -80,7 +73,7 @@ static const int8_t quant5[256] = {
     -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -2, -1, -1, -1,
 };
 
-static const int8_t quant9_10bit[256] = {
+const int8_t ffv1_quant9_10bit[256] = {
      0,  0,  0,  0,  0,  1,  1,  1,  1,  1,  1,  1,  1,  2,  2,  2,
      2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  2,  3,  3,  3,  3,  3,
      3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,  3,
@@ -99,7 +92,7 @@ static const int8_t quant9_10bit[256] = {
     -2, -2, -2, -2, -1, -1, -1, -1, -1, -1, -1, -1, -0, -0, -0, -0,
 };
 
-static const int8_t quant11[256] = {
+const int8_t ffv1_quant11[256] = {
      0,  1,  2,  2,  2,  3,  3,  3,  3,  3,  3,  3,  4,  4,  4,  4,
      4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,  4,
      4,  4,  4,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,  5,
@@ -118,7 +111,7 @@ static const int8_t quant11[256] = {
     -4, -4, -4, -4, -4, -3, -3, -3, -3, -3, -3, -3, -2, -2, -2, -1,
 };
 
-static const uint8_t ver2_state[256] = {
+const uint8_t ffv1_ver2_state[256] = {
       0,  10,  10,  10,  10,  16,  16,  16,  28,  16,  16,  29,  42,  49,  20,  49,
      59,  25,  26,  26,  27,  31,  33,  33,  33,  34,  34,  37,  67,  38,  39,  39,
      40,  40,  41,  79,  43,  44,  45,  45,  48,  48,  64,  50,  51,  52,  88,  52,
@@ -137,561 +130,8 @@ static const uint8_t ver2_state[256] = {
     241, 243, 242, 244, 245, 246, 247, 248, 249, 250, 251, 252, 252, 253, 254, 255,
 };
 
-typedef struct VlcState {
-    int16_t drift;
-    uint16_t error_sum;
-    int8_t bias;
-    uint8_t count;
-} VlcState;
-
-typedef struct PlaneContext {
-    int16_t quant_table[MAX_CONTEXT_INPUTS][256];
-    int quant_table_index;
-    int context_count;
-    uint8_t (*state)[CONTEXT_SIZE];
-    VlcState *vlc_state;
-    uint8_t interlace_bit_state[2];
-} PlaneContext;
-
-#define MAX_SLICES 256
-
-typedef struct FFV1Context {
-    AVCodecContext *avctx;
-    RangeCoder c;
-    GetBitContext gb;
-    PutBitContext pb;
-    uint64_t rc_stat[256][2];
-    uint64_t (*rc_stat2[MAX_QUANT_TABLES])[32][2];
-    int version;
-    int width, height;
-    int chroma_h_shift, chroma_v_shift;
-    int flags;
-    int picture_number;
-    AVFrame picture;
-    int plane_count;
-    int ac;     // 1 = range coder <-> 0 = golomb rice
-    PlaneContext plane[MAX_PLANES];
-    int16_t quant_table[MAX_CONTEXT_INPUTS][256];
-    int16_t quant_tables[MAX_QUANT_TABLES][MAX_CONTEXT_INPUTS][256];
-    int context_count[MAX_QUANT_TABLES];
-    uint8_t state_transition[256];
-    uint8_t (*initial_states[MAX_QUANT_TABLES])[32];
-    int run_index;
-    int colorspace;
-    int16_t *sample_buffer;
-    int gob_count;
-
-    int quant_table_count;
-
-    DSPContext dsp;
-
-    struct FFV1Context *slice_context[MAX_SLICES];
-    int slice_count;
-    int num_v_slices;
-    int num_h_slices;
-    int slice_width;
-    int slice_height;
-    int slice_x;
-    int slice_y;
-} FFV1Context;
-
-static av_always_inline int fold(int diff, int bits)
-{
-    if (bits == 8)
-        diff = (int8_t)diff;
-    else {
-        diff +=  1 << (bits  - 1);
-        diff &= (1 <<  bits) - 1;
-        diff -=  1 << (bits  - 1);
-    }
-
-    return diff;
-}
-
-static inline int predict(int16_t *src, int16_t *last)
-{
-    const int LT = last[-1];
-    const int T  = last[0];
-    const int L  = src[-1];
-
-    return mid_pred(L, L + T - LT, T);
-}
-
-static inline int get_context(PlaneContext *p, int16_t *src,
-                              int16_t *last, int16_t *last2)
-{
-    const int LT = last[-1];
-    const int T  = last[0];
-    const int RT = last[1];
-    const int L  = src[-1];
-
-    if (p->quant_table[3][127]) {
-        const int TT = last2[0];
-        const int LL = src[-2];
-        return p->quant_table[0][(L - LT) & 0xFF] +
-               p->quant_table[1][(LT - T) & 0xFF] +
-               p->quant_table[2][(T - RT) & 0xFF] +
-               p->quant_table[3][(LL - L) & 0xFF] +
-               p->quant_table[4][(TT - T) & 0xFF];
-    } else
-        return p->quant_table[0][(L - LT) & 0xFF] +
-               p->quant_table[1][(LT - T) & 0xFF] +
-               p->quant_table[2][(T - RT) & 0xFF];
-}
-
-static void find_best_state(uint8_t best_state[256][256],
-                            const uint8_t one_state[256])
-{
-    int i, j, k, m;
-    double l2tab[256];
-
-    for (i = 1; i < 256; i++)
-        l2tab[i] = log2(i / 256.0);
-
-    for (i = 0; i < 256; i++) {
-        double best_len[256];
-        double p = i / 256.0;
-
-        for (j = 0; j < 256; j++)
-            best_len[j] = 1 << 30;
-
-        for (j = FFMAX(i - 10, 1); j < FFMIN(i + 11, 256); j++) {
-            double occ[256] = { 0 };
-            double len      = 0;
-            occ[j] = 1.0;
-            for (k = 0; k < 256; k++) {
-                double newocc[256] = { 0 };
-                for (m = 0; m < 256; m++)
-                    if (occ[m]) {
-                        len -= occ[m] *     (p  * l2tab[m] +
-                                        (1 - p) * l2tab[256 - m]);
-                    }
-                if (len < best_len[k]) {
-                    best_len[k]      = len;
-                    best_state[i][k] = j;
-                }
-                for (m = 0; m < 256; m++)
-                    if (occ[m]) {
-                        newocc[one_state[m]]             += occ[m] * p;
-                        newocc[256 - one_state[256 - m]] += occ[m] * (1 - p);
-                    }
-                memcpy(occ, newocc, sizeof(occ));
-            }
-        }
-    }
-}
-
-static av_always_inline av_flatten void put_symbol_inline(RangeCoder *c,
-                                                          uint8_t *state, int v,
-                                                          int is_signed,
-                                                          uint64_t rc_stat[256][2],
-                                                          uint64_t rc_stat2[32][2])
-{
-    int i;
-
-#define put_rac(C, S, B)                        \
-    do {                                        \
-        if (rc_stat) {                          \
-            rc_stat[*(S)][B]++;                 \
-            rc_stat2[(S) - state][B]++;         \
-        }                                       \
-        put_rac(C, S, B);                       \
-    } while (0)
-
-    if (v) {
-        const int a = FFABS(v);
-        const int e = av_log2(a);
-        put_rac(c, state + 0, 0);
-        if (e <= 9) {
-            for (i = 0; i < e; i++)
-                put_rac(c, state + 1 + i, 1);  // 1..10
-            put_rac(c, state + 1 + i, 0);
-
-            for (i = e - 1; i >= 0; i--)
-                put_rac(c, state + 22 + i, (a >> i) & 1);  // 22..31
-
-            if (is_signed)
-                put_rac(c, state + 11 + e, v < 0);  // 11..21
-        } else {
-            for (i = 0; i < e; i++)
-                put_rac(c, state + 1 + FFMIN(i, 9), 1);  // 1..10
-            put_rac(c, state + 1 + 9, 0);
-
-            for (i = e - 1; i >= 0; i--)
-                put_rac(c, state + 22 + FFMIN(i, 9), (a >> i) & 1);  // 22..31
-
-            if (is_signed)
-                put_rac(c, state + 11 + 10, v < 0);  // 11..21
-        }
-    } else {
-        put_rac(c, state + 0, 1);
-    }
-#undef put_rac
-}
-
-static av_noinline void put_symbol(RangeCoder *c, uint8_t *state,
-                                   int v, int is_signed)
-{
-    put_symbol_inline(c, state, v, is_signed, NULL, NULL);
-}
-
-static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
-                                               int is_signed)
-{
-    if (get_rac(c, state + 0))
-        return 0;
-    else {
-        int i, e, a;
-        e = 0;
-        while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
-            e++;
-
-        a = 1;
-        for (i = e - 1; i >= 0; i--)
-            a += a + get_rac(c, state + 22 + FFMIN(i, 9));  // 22..31
-
-        e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
-        return (a ^ e) - e;
-    }
-}
 
-static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
-{
-    return get_symbol_inline(c, state, is_signed);
-}
-
-static inline void update_vlc_state(VlcState *const state, const int v)
-{
-    int drift = state->drift;
-    int count = state->count;
-    state->error_sum += FFABS(v);
-    drift            += v;
-
-    if (count == 128) { // FIXME: variable
-        count            >>= 1;
-        drift            >>= 1;
-        state->error_sum >>= 1;
-    }
-    count++;
-
-    if (drift <= -count) {
-        if (state->bias > -128)
-            state->bias--;
-
-        drift += count;
-        if (drift <= -count)
-            drift = -count + 1;
-    } else if (drift > 0) {
-        if (state->bias < 127)
-            state->bias++;
-
-        drift -= count;
-        if (drift > 0)
-            drift = 0;
-    }
-
-    state->drift = drift;
-    state->count = count;
-}
-
-static inline void put_vlc_symbol(PutBitContext *pb, VlcState *const state,
-                                  int v, int bits)
-{
-    int i, k, code;
-    v = fold(v - state->bias, bits);
-
-    i = state->count;
-    k = 0;
-    while (i < state->error_sum) { // FIXME: optimize
-        k++;
-        i += i;
-    }
-
-    assert(k <= 8);
-
-#if 0 // JPEG LS
-    if (k == 0 && 2 * state->drift <= -state->count)
-        code = v ^ (-1);
-    else
-        code = v;
-#else
-    code = v ^ ((2 * state->drift + state->count) >> 31);
-#endif
-
-    av_dlog(NULL, "v:%d/%d bias:%d error:%d drift:%d count:%d k:%d\n", v, code,
-            state->bias, state->error_sum, state->drift, state->count, k);
-    set_sr_golomb(pb, code, k, 12, bits);
-
-    update_vlc_state(state, v);
-}
-
-static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
-                                 int bits)
-{
-    int k, i, v, ret;
-
-    i = state->count;
-    k = 0;
-    while (i < state->error_sum) { // FIXME: optimize
-        k++;
-        i += i;
-    }
-
-    assert(k <= 8);
-
-    v = get_sr_golomb(gb, k, 12, bits);
-    av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
-            v, state->bias, state->error_sum, state->drift, state->count, k);
-
-#if 0 // JPEG LS
-    if (k == 0 && 2 * state->drift <= -state->count)
-        v ^= (-1);
-#else
-    v ^= ((2 * state->drift + state->count) >> 31);
-#endif
-
-    ret = fold(v + state->bias, bits);
-
-    update_vlc_state(state, v);
-
-    return ret;
-}
-
-#if CONFIG_FFV1_ENCODER
-static av_always_inline int encode_line(FFV1Context *s, int w,
-                                        int16_t *sample[3],
-                                        int plane_index, int bits)
-{
-    PlaneContext *const p = &s->plane[plane_index];
-    RangeCoder *const c   = &s->c;
-    int x;
-    int run_index = s->run_index;
-    int run_count = 0;
-    int run_mode  = 0;
-
-    if (s->ac) {
-        if (c->bytestream_end - c->bytestream < w * 20) {
-            av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
-            return -1;
-        }
-    } else {
-        if (s->pb.buf_end - s->pb.buf - (put_bits_count(&s->pb) >> 3) < w * 4) {
-            av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
-            return -1;
-        }
-    }
-
-    for (x = 0; x < w; x++) {
-        int diff, context;
-
-        context = get_context(p, sample[0] + x, sample[1] + x, sample[2] + x);
-        diff    = sample[0][x] - predict(sample[0] + x, sample[1] + x);
-
-        if (context < 0) {
-            context = -context;
-            diff    = -diff;
-        }
-
-        diff = fold(diff, bits);
-
-        if (s->ac) {
-            if (s->flags & CODEC_FLAG_PASS1) {
-                put_symbol_inline(c, p->state[context], diff, 1, s->rc_stat,
-                                  s->rc_stat2[p->quant_table_index][context]);
-            } else {
-                put_symbol_inline(c, p->state[context], diff, 1, NULL, NULL);
-            }
-        } else {
-            if (context == 0)
-                run_mode = 1;
-
-            if (run_mode) {
-                if (diff) {
-                    while (run_count >= 1 << ff_log2_run[run_index]) {
-                        run_count -= 1 << ff_log2_run[run_index];
-                        run_index++;
-                        put_bits(&s->pb, 1, 1);
-                    }
-
-                    put_bits(&s->pb, 1 + ff_log2_run[run_index], run_count);
-                    if (run_index)
-                        run_index--;
-                    run_count = 0;
-                    run_mode  = 0;
-                    if (diff > 0)
-                        diff--;
-                } else {
-                    run_count++;
-                }
-            }
-
-            av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
-                    run_count, run_index, run_mode, x,
-                    (int)put_bits_count(&s->pb));
-
-            if (run_mode == 0)
-                put_vlc_symbol(&s->pb, &p->vlc_state[context], diff, bits);
-        }
-    }
-    if (run_mode) {
-        while (run_count >= 1 << ff_log2_run[run_index]) {
-            run_count -= 1 << ff_log2_run[run_index];
-            run_index++;
-            put_bits(&s->pb, 1, 1);
-        }
-
-        if (run_count)
-            put_bits(&s->pb, 1, 1);
-    }
-    s->run_index = run_index;
-
-    return 0;
-}
-
-static void encode_plane(FFV1Context *s, uint8_t *src, int w, int h,
-                         int stride, int plane_index)
-{
-    int x, y, i;
-    const int ring_size = s->avctx->context_model ? 3 : 2;
-    int16_t *sample[3];
-    s->run_index = 0;
-
-    memset(s->sample_buffer, 0, ring_size * (w + 6) * sizeof(*s->sample_buffer));
-
-    for (y = 0; y < h; y++) {
-        for (i = 0; i < ring_size; i++)
-            sample[i] = s->sample_buffer + (w + 6) * ((h + i - y) % ring_size) + 3;
-
-        sample[0][-1] = sample[1][0];
-        sample[1][w]  = sample[1][w - 1];
-// { START_TIMER
-        if (s->avctx->bits_per_raw_sample <= 8) {
-            for (x = 0; x < w; x++)
-                sample[0][x] = src[x + stride * y];
-            encode_line(s, w, sample, plane_index, 8);
-        } else {
-            for (x = 0; x < w; x++)
-                sample[0][x] = ((uint16_t *)(src + stride * y))[x] >>
-                               (16 - s->avctx->bits_per_raw_sample);
-            encode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
-        }
-// STOP_TIMER("encode line") }
-    }
-}
-
-static void encode_rgb_frame(FFV1Context *s, uint32_t *src, int w, int h,
-                             int stride)
-{
-    int x, y, p, i;
-    const int ring_size = s->avctx->context_model ? 3 : 2;
-    int16_t *sample[3][3];
-    s->run_index = 0;
-
-    memset(s->sample_buffer, 0, ring_size * 3 * (w + 6) * sizeof(*s->sample_buffer));
-
-    for (y = 0; y < h; y++) {
-        for (i = 0; i < ring_size; i++)
-            for (p = 0; p < 3; p++)
-                sample[p][i] = s->sample_buffer + p * ring_size * (w + 6) +
-                               ((h + i - y) % ring_size) * (w + 6) + 3;
-
-        for (x = 0; x < w; x++) {
-            int v = src[x + stride * y];
-            int b =  v        & 0xFF;
-            int g = (v >>  8) & 0xFF;
-            int r = (v >> 16) & 0xFF;
-
-            b -= g;
-            r -= g;
-            g += (b + r) >> 2;
-            b += 0x100;
-            r += 0x100;
-
-            sample[0][0][x] = g;
-            sample[1][0][x] = b;
-            sample[2][0][x] = r;
-        }
-        for (p = 0; p < 3; p++) {
-            sample[p][0][-1] = sample[p][1][0];
-            sample[p][1][w]  = sample[p][1][w - 1];
-            encode_line(s, w, sample[p], FFMIN(p, 1), 9);
-        }
-    }
-}
-
-static void write_quant_table(RangeCoder *c, int16_t *quant_table)
-{
-    int last = 0;
-    int i;
-    uint8_t state[CONTEXT_SIZE];
-    memset(state, 128, sizeof(state));
-
-    for (i = 1; i < 128; i++)
-        if (quant_table[i] != quant_table[i - 1]) {
-            put_symbol(c, state, i - last - 1, 0);
-            last = i;
-        }
-    put_symbol(c, state, i - last - 1, 0);
-}
-
-static void write_quant_tables(RangeCoder *c,
-                               int16_t quant_table[MAX_CONTEXT_INPUTS][256])
-{
-    int i;
-    for (i = 0; i < 5; i++)
-        write_quant_table(c, quant_table[i]);
-}
-
-static void write_header(FFV1Context *f)
-{
-    uint8_t state[CONTEXT_SIZE];
-    int i, j;
-    RangeCoder *const c = &f->slice_context[0]->c;
-
-    memset(state, 128, sizeof(state));
-
-    if (f->version < 2) {
-        put_symbol(c, state, f->version, 0);
-        put_symbol(c, state, f->ac, 0);
-        if (f->ac > 1) {
-            for (i = 1; i < 256; i++)
-                put_symbol(c, state,
-                           f->state_transition[i] - c->one_state[i], 1);
-        }
-        put_symbol(c, state, f->colorspace, 0); // YUV cs type
-        if (f->version > 0)
-            put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
-        put_rac(c, state, 1); // chroma planes
-        put_symbol(c, state, f->chroma_h_shift, 0);
-        put_symbol(c, state, f->chroma_v_shift, 0);
-        put_rac(c, state, 0); // no transparency plane
-
-        write_quant_tables(c, f->quant_table);
-    } else {
-        put_symbol(c, state, f->slice_count, 0);
-        for (i = 0; i < f->slice_count; i++) {
-            FFV1Context *fs = f->slice_context[i];
-            put_symbol(c, state,
-                       (fs->slice_x      + 1) * f->num_h_slices / f->width, 0);
-            put_symbol(c, state,
-                       (fs->slice_y      + 1) * f->num_v_slices / f->height, 0);
-            put_symbol(c, state,
-                       (fs->slice_width  + 1) * f->num_h_slices / f->width - 1,
-                       0);
-            put_symbol(c, state,
-                       (fs->slice_height + 1) * f->num_v_slices / f->height - 1,
-                       0);
-            for (j = 0; j < f->plane_count; j++) {
-                put_symbol(c, state, f->plane[j].quant_table_index, 0);
-                av_assert0(f->plane[j].quant_table_index == f->avctx->context_model);
-            }
-        }
-    }
-}
-
-#endif /* CONFIG_FFV1_ENCODER */
-
-static av_cold int common_init(AVCodecContext *avctx)
+int ffv1_common_init(AVCodecContext *avctx)
 {
     FFV1Context *s = avctx->priv_data;
 
@@ -711,7 +151,7 @@ static av_cold int common_init(AVCodecContext *avctx)
     return 0;
 }
 
-static int init_slice_state(FFV1Context *f)
+int ffv1_init_slice_state(FFV1Context *f)
 {
     int i, j;
 
@@ -746,7 +186,7 @@ static int init_slice_state(FFV1Context *f)
     return 0;
 }
 
-static av_cold int init_slice_contexts(FFV1Context *f)
+av_cold int ffv1_init_slice_contexts(FFV1Context *f)
 {
     int i;
 
@@ -777,7 +217,7 @@ static av_cold int init_slice_contexts(FFV1Context *f)
     return 0;
 }
 
-static int allocate_initial_states(FFV1Context *f)
+int ffv1_allocate_initial_states(FFV1Context *f)
 {
     int i;
 
@@ -792,300 +232,7 @@ static int allocate_initial_states(FFV1Context *f)
     return 0;
 }
 
-#if CONFIG_FFV1_ENCODER
-static int write_extra_header(FFV1Context *f)
-{
-    RangeCoder *const c = &f->c;
-    uint8_t state[CONTEXT_SIZE];
-    int i, j, k;
-    uint8_t state2[32][CONTEXT_SIZE];
-
-    memset(state2, 128, sizeof(state2));
-    memset(state, 128, sizeof(state));
-
-    f->avctx->extradata = av_malloc(f->avctx->extradata_size = 10000 +
-                                    (11 * 11 * 5 * 5 * 5 + 11 * 11 * 11) * 32);
-    ff_init_range_encoder(c, f->avctx->extradata, f->avctx->extradata_size);
-    ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
-
-    put_symbol(c, state, f->version, 0);
-    put_symbol(c, state, f->ac, 0);
-    if (f->ac > 1)
-        for (i = 1; i < 256; i++)
-            put_symbol(c, state, f->state_transition[i] - c->one_state[i], 1);
-    put_symbol(c, state, f->colorspace, 0); // YUV cs type
-    put_symbol(c, state, f->avctx->bits_per_raw_sample, 0);
-    put_rac(c, state, 1); // chroma planes
-    put_symbol(c, state, f->chroma_h_shift, 0);
-    put_symbol(c, state, f->chroma_v_shift, 0);
-    put_rac(c, state, 0); // no transparency plane
-    put_symbol(c, state, f->num_h_slices - 1, 0);
-    put_symbol(c, state, f->num_v_slices - 1, 0);
-
-    put_symbol(c, state, f->quant_table_count, 0);
-    for (i = 0; i < f->quant_table_count; i++)
-        write_quant_tables(c, f->quant_tables[i]);
-
-    for (i = 0; i < f->quant_table_count; i++) {
-        for (j = 0; j < f->context_count[i] * CONTEXT_SIZE; j++)
-            if (f->initial_states[i] && f->initial_states[i][0][j] != 128)
-                break;
-        if (j < f->context_count[i] * CONTEXT_SIZE) {
-            put_rac(c, state, 1);
-            for (j = 0; j < f->context_count[i]; j++)
-                for (k = 0; k < CONTEXT_SIZE; k++) {
-                    int pred = j ? f->initial_states[i][j - 1][k] : 128;
-                    put_symbol(c, state2[k],
-                               (int8_t)(f->initial_states[i][j][k] - pred), 1);
-                }
-        } else {
-            put_rac(c, state, 0);
-        }
-    }
-
-    f->avctx->extradata_size = ff_rac_terminate(c);
-
-    return 0;
-}
-
-static int sort_stt(FFV1Context *s, uint8_t stt[256])
-{
-    int i, i2, changed, print = 0;
-
-    do {
-        changed = 0;
-        for (i = 12; i < 244; i++) {
-            for (i2 = i + 1; i2 < 245 && i2 < i + 4; i2++) {
-
-#define COST(old, new)                                      \
-    s->rc_stat[old][0] * -log2((256 - (new)) / 256.0) +     \
-    s->rc_stat[old][1] * -log2((new)         / 256.0)
-
-#define COST2(old, new)                         \
-    COST(old, new) + COST(256 - (old), 256 - (new))
-
-                double size0 = COST2(i,  i) + COST2(i2, i2);
-                double sizeX = COST2(i, i2) + COST2(i2, i);
-                if (sizeX < size0 && i != 128 && i2 != 128) {
-                    int j;
-                    FFSWAP(int, stt[i], stt[i2]);
-                    FFSWAP(int, s->rc_stat[i][0], s->rc_stat[i2][0]);
-                    FFSWAP(int, s->rc_stat[i][1], s->rc_stat[i2][1]);
-                    if (i != 256 - i2) {
-                        FFSWAP(int, stt[256 - i], stt[256 - i2]);
-                        FFSWAP(int, s->rc_stat[256 - i][0], s->rc_stat[256 - i2][0]);
-                        FFSWAP(int, s->rc_stat[256 - i][1], s->rc_stat[256 - i2][1]);
-                    }
-                    for (j = 1; j < 256; j++) {
-                        if (stt[j] == i)
-                            stt[j] = i2;
-                        else if (stt[j] == i2)
-                            stt[j] = i;
-                        if (i != 256 - i2) {
-                            if (stt[256 - j] == 256 - i)
-                                stt[256 - j] = 256 - i2;
-                            else if (stt[256 - j] == 256 - i2)
-                                stt[256 - j] = 256 - i;
-                        }
-                    }
-                    print = changed = 1;
-                }
-            }
-        }
-    } while (changed);
-    return print;
-}
-
-static av_cold int encode_init(AVCodecContext *avctx)
-{
-    FFV1Context *s = avctx->priv_data;
-    int i, j, k, m;
-
-    common_init(avctx);
-
-    s->version = 0;
-    s->ac      = avctx->coder_type ? 2 : 0;
-
-    if (s->ac > 1)
-        for (i = 1; i < 256; i++)
-            s->state_transition[i] = ver2_state[i];
-
-    s->plane_count = 2;
-    for (i = 0; i < 256; i++) {
-        s->quant_table_count = 2;
-        if (avctx->bits_per_raw_sample <= 8) {
-            s->quant_tables[0][0][i] = quant11[i];
-            s->quant_tables[0][1][i] = quant11[i] * 11;
-            s->quant_tables[0][2][i] = quant11[i] * 11 * 11;
-            s->quant_tables[1][0][i] = quant11[i];
-            s->quant_tables[1][1][i] = quant11[i] * 11;
-            s->quant_tables[1][2][i] = quant5[i]  * 11 * 11;
-            s->quant_tables[1][3][i] = quant5[i]  *  5 * 11 * 11;
-            s->quant_tables[1][4][i] = quant5[i]  *  5 *  5 * 11 * 11;
-        } else {
-            s->quant_tables[0][0][i] = quant9_10bit[i];
-            s->quant_tables[0][1][i] = quant9_10bit[i] * 11;
-            s->quant_tables[0][2][i] = quant9_10bit[i] * 11 * 11;
-            s->quant_tables[1][0][i] = quant9_10bit[i];
-            s->quant_tables[1][1][i] = quant9_10bit[i] * 11;
-            s->quant_tables[1][2][i] = quant5_10bit[i] * 11 * 11;
-            s->quant_tables[1][3][i] = quant5_10bit[i] *  5 * 11 * 11;
-            s->quant_tables[1][4][i] = quant5_10bit[i] *  5 *  5 * 11 * 11;
-        }
-    }
-    s->context_count[0] = (11 * 11 * 11        + 1) / 2;
-    s->context_count[1] = (11 * 11 * 5 * 5 * 5 + 1) / 2;
-    memcpy(s->quant_table, s->quant_tables[avctx->context_model],
-           sizeof(s->quant_table));
-
-    for (i = 0; i < s->plane_count; i++) {
-        PlaneContext *const p = &s->plane[i];
-
-        memcpy(p->quant_table, s->quant_table, sizeof(p->quant_table));
-        p->quant_table_index = avctx->context_model;
-        p->context_count     = s->context_count[p->quant_table_index];
-    }
-
-    if (allocate_initial_states(s) < 0)
-        return AVERROR(ENOMEM);
-
-    avctx->coded_frame = &s->picture;
-    switch (avctx->pix_fmt) {
-    case AV_PIX_FMT_YUV444P16:
-    case AV_PIX_FMT_YUV422P16:
-    case AV_PIX_FMT_YUV420P16:
-        if (avctx->bits_per_raw_sample <= 8) {
-            av_log(avctx, AV_LOG_ERROR, "bits_per_raw_sample invalid\n");
-            return -1;
-        }
-        if (!s->ac) {
-            av_log(avctx, AV_LOG_ERROR,
-                   "bits_per_raw_sample of more than 8 needs -coder 1 currently\n");
-            return -1;
-        }
-        s->version = FFMAX(s->version, 1);
-    case AV_PIX_FMT_YUV444P:
-    case AV_PIX_FMT_YUV422P:
-    case AV_PIX_FMT_YUV420P:
-    case AV_PIX_FMT_YUV411P:
-    case AV_PIX_FMT_YUV410P:
-        s->colorspace = 0;
-        break;
-    case AV_PIX_FMT_RGB32:
-        s->colorspace = 1;
-        break;
-    default:
-        av_log(avctx, AV_LOG_ERROR, "format not supported\n");
-        return -1;
-    }
-    avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift,
-                                  &s->chroma_v_shift);
-
-    s->picture_number = 0;
-
-    if (avctx->flags & (CODEC_FLAG_PASS1 | CODEC_FLAG_PASS2)) {
-        for (i = 0; i < s->quant_table_count; i++) {
-            s->rc_stat2[i] = av_mallocz(s->context_count[i] *
-                                        sizeof(*s->rc_stat2[i]));
-            if (!s->rc_stat2[i])
-                return AVERROR(ENOMEM);
-        }
-    }
-    if (avctx->stats_in) {
-        char *p = avctx->stats_in;
-        uint8_t best_state[256][256];
-        int gob_count = 0;
-        char *next;
-
-        av_assert0(s->version >= 2);
-
-        for (;; ) {
-            for (j = 0; j < 256; j++)
-                for (i = 0; i < 2; i++) {
-                    s->rc_stat[j][i] = strtol(p, &next, 0);
-                    if (next == p) {
-                        av_log(avctx, AV_LOG_ERROR,
-                               "2Pass file invalid at %d %d [%s]\n", j, i, p);
-                        return -1;
-                    }
-                    p = next;
-                }
-            for (i = 0; i < s->quant_table_count; i++)
-                for (j = 0; j < s->context_count[i]; j++) {
-                    for (k = 0; k < 32; k++)
-                        for (m = 0; m < 2; m++) {
-                            s->rc_stat2[i][j][k][m] = strtol(p, &next, 0);
-                            if (next == p) {
-                                av_log(avctx, AV_LOG_ERROR,
-                                       "2Pass file invalid at %d %d %d %d [%s]\n",
-                                       i, j, k, m, p);
-                                return -1;
-                            }
-                            p = next;
-                        }
-                }
-            gob_count = strtol(p, &next, 0);
-            if (next == p || gob_count < 0) {
-                av_log(avctx, AV_LOG_ERROR, "2Pass file invalid\n");
-                return -1;
-            }
-            p = next;
-            while (*p == '\n' || *p == ' ')
-                p++;
-            if (p[0] == 0)
-                break;
-        }
-        sort_stt(s, s->state_transition);
-
-        find_best_state(best_state, s->state_transition);
-
-        for (i = 0; i < s->quant_table_count; i++) {
-            for (j = 0; j < s->context_count[i]; j++)
-                for (k = 0; k < 32; k++) {
-                    double p = 128;
-                    if (s->rc_stat2[i][j][k][0] + s->rc_stat2[i][j][k][1]) {
-                        p = 256.0 * s->rc_stat2[i][j][k][1] /
-                            (s->rc_stat2[i][j][k][0] + s->rc_stat2[i][j][k][1]);
-                    }
-                    s->initial_states[i][j][k] =
-                        best_state[av_clip(round(p), 1, 255)][av_clip((s->rc_stat2[i][j][k][0] +
-                                                                       s->rc_stat2[i][j][k][1]) /
-                                                                      gob_count, 0, 255)];
-                }
-        }
-    }
-
-    if (s->version > 1) {
-        s->num_h_slices = 2;
-        s->num_v_slices = 2;
-        write_extra_header(s);
-    }
-
-    if (init_slice_contexts(s) < 0)
-        return -1;
-    if (init_slice_state(s) < 0)
-        return -1;
-
-#define STATS_OUT_SIZE 1024 * 1024 * 6
-    if (avctx->flags & CODEC_FLAG_PASS1) {
-        avctx->stats_out = av_mallocz(STATS_OUT_SIZE);
-        for (i = 0; i < s->quant_table_count; i++)
-            for (j = 0; j < s->slice_count; j++) {
-                FFV1Context *sf = s->slice_context[j];
-                av_assert0(!sf->rc_stat2[i]);
-                sf->rc_stat2[i] = av_mallocz(s->context_count[i] *
-                                             sizeof(*sf->rc_stat2[i]));
-                if (!sf->rc_stat2[i])
-                    return AVERROR(ENOMEM);
-            }
-    }
-
-    return 0;
-}
-
-#endif /* CONFIG_FFV1_ENCODER */
-
-static void clear_state(FFV1Context *f)
+void ffv1_clear_state(FFV1Context *f)
 {
     int i, si, j;
 
@@ -1115,178 +262,7 @@ static void clear_state(FFV1Context *f)
     }
 }
 
-#if CONFIG_FFV1_ENCODER
-static int encode_slice(AVCodecContext *c, void *arg)
-{
-    FFV1Context *fs  = *(void **)arg;
-    FFV1Context *f   = fs->avctx->priv_data;
-    int width        = fs->slice_width;
-    int height       = fs->slice_height;
-    int x            = fs->slice_x;
-    int y            = fs->slice_y;
-    AVFrame *const p = &f->picture;
-
-    if (f->colorspace == 0) {
-        const int chroma_width  = -((-width) >> f->chroma_h_shift);
-        const int chroma_height = -((-height) >> f->chroma_v_shift);
-        const int cx            = x >> f->chroma_h_shift;
-        const int cy            = y >> f->chroma_v_shift;
-
-        encode_plane(fs, p->data[0] + x + y * p->linesize[0],
-                     width, height, p->linesize[0], 0);
-
-        encode_plane(fs, p->data[1] + cx + cy * p->linesize[1],
-                     chroma_width, chroma_height, p->linesize[1], 1);
-        encode_plane(fs, p->data[2] + cx + cy * p->linesize[2],
-                     chroma_width, chroma_height, p->linesize[2], 1);
-    } else {
-        encode_rgb_frame(fs, (uint32_t *)(p->data[0]) +
-                         x + y * (p->linesize[0] / 4),
-                         width, height, p->linesize[0] / 4);
-    }
-    emms_c();
-
-    return 0;
-}
-
-static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
-                        const AVFrame *pict, int *got_packet)
-{
-    FFV1Context *f      = avctx->priv_data;
-    RangeCoder *const c = &f->slice_context[0]->c;
-    AVFrame *const p    = &f->picture;
-    int used_count      = 0;
-    uint8_t keystate    = 128;
-    uint8_t *buf_p;
-    int i, ret;
-
-    if (!pkt->data &&
-        (ret = av_new_packet(pkt, avctx->width * avctx->height *
-                             ((8 * 2 + 1 + 1) * 4) / 8 + FF_MIN_BUFFER_SIZE)) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "Error getting output packet.\n");
-        return ret;
-    }
-
-    ff_init_range_encoder(c, pkt->data, pkt->size);
-    ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
-
-    *p           = *pict;
-    p->pict_type = AV_PICTURE_TYPE_I;
-
-    if (avctx->gop_size == 0 || f->picture_number % avctx->gop_size == 0) {
-        put_rac(c, &keystate, 1);
-        p->key_frame = 1;
-        f->gob_count++;
-        write_header(f);
-        clear_state(f);
-    } else {
-        put_rac(c, &keystate, 0);
-        p->key_frame = 0;
-    }
-
-    if (!f->ac) {
-        used_count += ff_rac_terminate(c);
-        init_put_bits(&f->slice_context[0]->pb, pkt->data + used_count,
-                      pkt->size - used_count);
-    } else if (f->ac > 1) {
-        int i;
-        for (i = 1; i < 256; i++) {
-            c->one_state[i]        = f->state_transition[i];
-            c->zero_state[256 - i] = 256 - c->one_state[i];
-        }
-    }
-
-    for (i = 1; i < f->slice_count; i++) {
-        FFV1Context *fs = f->slice_context[i];
-        uint8_t *start  = pkt->data + (pkt->size - used_count) * i / f->slice_count;
-        int len         = pkt->size / f->slice_count;
-
-        if (fs->ac)
-            ff_init_range_encoder(&fs->c, start, len);
-        else
-            init_put_bits(&fs->pb, start, len);
-    }
-    avctx->execute(avctx, encode_slice, &f->slice_context[0], NULL,
-                   f->slice_count, sizeof(void *));
-
-    buf_p = pkt->data;
-    for (i = 0; i < f->slice_count; i++) {
-        FFV1Context *fs = f->slice_context[i];
-        int bytes;
-
-        if (fs->ac) {
-            uint8_t state = 128;
-            put_rac(&fs->c, &state, 0);
-            bytes = ff_rac_terminate(&fs->c);
-        } else {
-            flush_put_bits(&fs->pb); // FIXME: nicer padding
-            bytes      = used_count + (put_bits_count(&fs->pb) + 7) / 8;
-            used_count = 0;
-        }
-        if (i > 0) {
-            av_assert0(bytes < pkt->size / f->slice_count);
-            memmove(buf_p, fs->ac ? fs->c.bytestream_start : fs->pb.buf, bytes);
-            av_assert0(bytes < (1 << 24));
-            AV_WB24(buf_p + bytes, bytes);
-            bytes += 3;
-        }
-        buf_p += bytes;
-    }
-
-    if ((avctx->flags & CODEC_FLAG_PASS1) && (f->picture_number & 31) == 0) {
-        int j, k, m;
-        char *p   = avctx->stats_out;
-        char *end = p + STATS_OUT_SIZE;
-
-        memset(f->rc_stat, 0, sizeof(f->rc_stat));
-        for (i = 0; i < f->quant_table_count; i++)
-            memset(f->rc_stat2[i], 0, f->context_count[i] * sizeof(*f->rc_stat2[i]));
-
-        for (j = 0; j < f->slice_count; j++) {
-            FFV1Context *fs = f->slice_context[j];
-            for (i = 0; i < 256; i++) {
-                f->rc_stat[i][0] += fs->rc_stat[i][0];
-                f->rc_stat[i][1] += fs->rc_stat[i][1];
-            }
-            for (i = 0; i < f->quant_table_count; i++) {
-                for (k = 0; k < f->context_count[i]; k++)
-                    for (m = 0; m < 32; m++) {
-                        f->rc_stat2[i][k][m][0] += fs->rc_stat2[i][k][m][0];
-                        f->rc_stat2[i][k][m][1] += fs->rc_stat2[i][k][m][1];
-                    }
-            }
-        }
-
-        for (j = 0; j < 256; j++) {
-            snprintf(p, end - p, "%" PRIu64 " %" PRIu64 " ",
-                     f->rc_stat[j][0], f->rc_stat[j][1]);
-            p += strlen(p);
-        }
-        snprintf(p, end - p, "\n");
-
-        for (i = 0; i < f->quant_table_count; i++) {
-            for (j = 0; j < f->context_count[i]; j++)
-                for (m = 0; m < 32; m++) {
-                    snprintf(p, end - p, "%" PRIu64 " %" PRIu64 " ",
-                             f->rc_stat2[i][j][m][0], f->rc_stat2[i][j][m][1]);
-                    p += strlen(p);
-                }
-        }
-        snprintf(p, end - p, "%d\n", f->gob_count);
-    } else if (avctx->flags & CODEC_FLAG_PASS1)
-        avctx->stats_out[0] = '\0';
-
-    f->picture_number++;
-    pkt->size   = buf_p - pkt->data;
-    pkt->flags |= AV_PKT_FLAG_KEY * p->key_frame;
-    *got_packet = 1;
-
-    return 0;
-}
-
-#endif /* CONFIG_FFV1_ENCODER */
-
-static av_cold int common_end(AVCodecContext *avctx)
+av_cold int ffv1_close(AVCodecContext *avctx)
 {
     FFV1Context *s = avctx->priv_data;
     int i, j;
@@ -1320,567 +296,3 @@ static av_cold int common_end(AVCodecContext *avctx)
 
     return 0;
 }
-
-static av_always_inline void decode_line(FFV1Context *s, int w,
-                                         int16_t *sample[2],
-                                         int plane_index, int bits)
-{
-    PlaneContext *const p = &s->plane[plane_index];
-    RangeCoder *const c   = &s->c;
-    int x;
-    int run_count = 0;
-    int run_mode  = 0;
-    int run_index = s->run_index;
-
-    for (x = 0; x < w; x++) {
-        int diff, context, sign;
-
-        context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
-        if (context < 0) {
-            context = -context;
-            sign    = 1;
-        } else
-            sign = 0;
-
-        av_assert2(context < p->context_count);
-
-        if (s->ac) {
-            diff = get_symbol_inline(c, p->state[context], 1);
-        } else {
-            if (context == 0 && run_mode == 0)
-                run_mode = 1;
-
-            if (run_mode) {
-                if (run_count == 0 && run_mode == 1) {
-                    if (get_bits1(&s->gb)) {
-                        run_count = 1 << ff_log2_run[run_index];
-                        if (x + run_count <= w)
-                            run_index++;
-                    } else {
-                        if (ff_log2_run[run_index])
-                            run_count = get_bits(&s->gb, ff_log2_run[run_index]);
-                        else
-                            run_count = 0;
-                        if (run_index)
-                            run_index--;
-                        run_mode = 2;
-                    }
-                }
-                run_count--;
-                if (run_count < 0) {
-                    run_mode  = 0;
-                    run_count = 0;
-                    diff      = get_vlc_symbol(&s->gb, &p->vlc_state[context],
-                                               bits);
-                    if (diff >= 0)
-                        diff++;
-                } else
-                    diff = 0;
-            } else
-                diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
-
-            av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
-                    run_count, run_index, run_mode, x, get_bits_count(&s->gb));
-        }
-
-        if (sign)
-            diff = -diff;
-
-        sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &
-                       ((1 << bits) - 1);
-    }
-    s->run_index = run_index;
-}
-
-static void decode_plane(FFV1Context *s, uint8_t *src,
-                         int w, int h, int stride, int plane_index)
-{
-    int x, y;
-    int16_t *sample[2];
-    sample[0] = s->sample_buffer + 3;
-    sample[1] = s->sample_buffer + w + 6 + 3;
-
-    s->run_index = 0;
-
-    memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
-
-    for (y = 0; y < h; y++) {
-        int16_t *temp = sample[0]; // FIXME: try a normal buffer
-
-        sample[0] = sample[1];
-        sample[1] = temp;
-
-        sample[1][-1] = sample[0][0];
-        sample[0][w]  = sample[0][w - 1];
-
-// { START_TIMER
-        if (s->avctx->bits_per_raw_sample <= 8) {
-            decode_line(s, w, sample, plane_index, 8);
-            for (x = 0; x < w; x++)
-                src[x + stride * y] = sample[1][x];
-        } else {
-            decode_line(s, w, sample, plane_index,
-                        s->avctx->bits_per_raw_sample);
-            for (x = 0; x < w; x++)
-                ((uint16_t *)(src + stride * y))[x] =
-                    sample[1][x] << (16 - s->avctx->bits_per_raw_sample);
-        }
-// STOP_TIMER("decode-line") }
-    }
-}
-
-static void decode_rgb_frame(FFV1Context *s, uint32_t *src,
-                             int w, int h, int stride)
-{
-    int x, y, p;
-    int16_t *sample[3][2];
-    for (x = 0; x < 3; x++) {
-        sample[x][0] = s->sample_buffer +  x * 2      * (w + 6) + 3;
-        sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;
-    }
-
-    s->run_index = 0;
-
-    memset(s->sample_buffer, 0, 6 * (w + 6) * sizeof(*s->sample_buffer));
-
-    for (y = 0; y < h; y++) {
-        for (p = 0; p < 3; p++) {
-            int16_t *temp = sample[p][0]; // FIXME: try a normal buffer
-
-            sample[p][0] = sample[p][1];
-            sample[p][1] = temp;
-
-            sample[p][1][-1] = sample[p][0][0];
-            sample[p][0][w]  = sample[p][0][w - 1];
-            decode_line(s, w, sample[p], FFMIN(p, 1), 9);
-        }
-        for (x = 0; x < w; x++) {
-            int g = sample[0][1][x];
-            int b = sample[1][1][x];
-            int r = sample[2][1][x];
-
-//            assert(g >= 0  && b >= 0  && r >= 0);
-//            assert(g < 256 && b < 512 && r < 512);
-
-            b -= 0x100;
-            r -= 0x100;
-            g -= (b + r) >> 2;
-            b += g;
-            r += g;
-
-            src[x + stride * y] = b + (g << 8) + (r << 16) + (0xFF << 24);
-        }
-    }
-}
-
-static int decode_slice(AVCodecContext *c, void *arg)
-{
-    FFV1Context *fs  = *(void **)arg;
-    FFV1Context *f   = fs->avctx->priv_data;
-    int width        = fs->slice_width;
-    int height       = fs->slice_height;
-    int x            = fs->slice_x;
-    int y            = fs->slice_y;
-    AVFrame *const p = &f->picture;
-
-    av_assert1(width && height);
-    if (f->colorspace == 0) {
-        const int chroma_width  = -((-width)  >> f->chroma_h_shift);
-        const int chroma_height = -((-height) >> f->chroma_v_shift);
-        const int cx            = x >> f->chroma_h_shift;
-        const int cy            = y >> f->chroma_v_shift;
-
-        decode_plane(fs, p->data[0] + x + y * p->linesize[0],
-                     width, height, p->linesize[0], 0);
-
-        decode_plane(fs, p->data[1] + cx + cy * p->linesize[1],
-                     chroma_width, chroma_height, p->linesize[1], 1);
-        decode_plane(fs, p->data[2] + cx + cy * p->linesize[1],
-                     chroma_width, chroma_height, p->linesize[2], 1);
-    } else {
-        decode_rgb_frame(fs,
-                         (uint32_t *)p->data[0] + x + y * (p->linesize[0] / 4),
-                         width, height, p->linesize[0] / 4);
-    }
-
-    emms_c();
-
-    return 0;
-}
-
-static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
-{
-    int v;
-    int i = 0;
-    uint8_t state[CONTEXT_SIZE];
-
-    memset(state, 128, sizeof(state));
-
-    for (v = 0; i < 128; v++) {
-        int len = get_symbol(c, state, 0) + 1;
-
-        if (len + i > 128)
-            return -1;
-
-        while (len--) {
-            quant_table[i] = scale * v;
-            i++;
-        }
-    }
-
-    for (i = 1; i < 128; i++)
-        quant_table[256 - i] = -quant_table[i];
-    quant_table[128] = -quant_table[127];
-
-    return 2 * v - 1;
-}
-
-static int read_quant_tables(RangeCoder *c,
-                             int16_t quant_table[MAX_CONTEXT_INPUTS][256])
-{
-    int i;
-    int context_count = 1;
-
-    for (i = 0; i < 5; i++) {
-        context_count *= read_quant_table(c, quant_table[i], context_count);
-        if (context_count > 32768U) {
-            return -1;
-        }
-    }
-    return (context_count + 1) / 2;
-}
-
-static int read_extra_header(FFV1Context *f)
-{
-    RangeCoder *const c = &f->c;
-    uint8_t state[CONTEXT_SIZE];
-    int i, j, k;
-    uint8_t state2[32][CONTEXT_SIZE];
-
-    memset(state2, 128, sizeof(state2));
-    memset(state, 128, sizeof(state));
-
-    ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
-    ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
-
-    f->version = get_symbol(c, state, 0);
-    f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);
-    if (f->ac > 1)
-        for (i = 1; i < 256; i++)
-            f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
-    f->colorspace                 = get_symbol(c, state, 0); // YUV cs type
-    f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
-    get_rac(c, state); // no chroma = false
-    f->chroma_h_shift = get_symbol(c, state, 0);
-    f->chroma_v_shift = get_symbol(c, state, 0);
-    get_rac(c, state); // transparency plane
-    f->plane_count  = 2;
-    f->num_h_slices = 1 + get_symbol(c, state, 0);
-    f->num_v_slices = 1 + get_symbol(c, state, 0);
-
-    if (f->num_h_slices > (unsigned)f->width ||
-        f->num_v_slices > (unsigned)f->height) {
-        av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");
-        return -1;
-    }
-
-    f->quant_table_count = get_symbol(c, state, 0);
-
-    if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
-        return -1;
-
-    for (i = 0; i < f->quant_table_count; i++) {
-        f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
-        if (f->context_count[i] < 0) {
-            av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
-            return -1;
-        }
-    }
-
-    if (allocate_initial_states(f) < 0)
-        return AVERROR(ENOMEM);
-
-    for (i = 0; i < f->quant_table_count; i++)
-        if (get_rac(c, state))
-            for (j = 0; j < f->context_count[i]; j++)
-                for (k = 0; k < CONTEXT_SIZE; k++) {
-                    int pred = j ? f->initial_states[i][j - 1][k] : 128;
-                    f->initial_states[i][j][k] =
-                        (pred + get_symbol(c, state2[k], 1)) & 0xFF;
-                }
-    return 0;
-}
-
-static int read_header(FFV1Context *f)
-{
-    uint8_t state[CONTEXT_SIZE];
-    int i, j, context_count;
-    RangeCoder *const c = &f->slice_context[0]->c;
-
-    memset(state, 128, sizeof(state));
-
-    if (f->version < 2) {
-        f->version = get_symbol(c, state, 0);
-        f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);
-        if (f->ac > 1)
-            for (i = 1; i < 256; i++)
-                f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
-        f->colorspace = get_symbol(c, state, 0); // YUV cs type
-        if (f->version > 0)
-            f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
-        get_rac(c, state); // no chroma = false
-        f->chroma_h_shift = get_symbol(c, state, 0);
-        f->chroma_v_shift = get_symbol(c, state, 0);
-        get_rac(c, state); // transparency plane
-        f->plane_count = 2;
-    }
-
-    if (f->colorspace == 0) {
-        if (f->avctx->bits_per_raw_sample <= 8) {
-            switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
-            case 0x00:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;
-                break;
-            case 0x10:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
-                break;
-            case 0x11:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;
-                break;
-            case 0x20:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;
-                break;
-            case 0x22:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;
-                break;
-            default:
-                av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
-                return -1;
-            }
-        } else {
-            switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
-            case 0x00:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
-                break;
-            case 0x10:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
-                break;
-            case 0x11:
-                f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
-                break;
-            default:
-                av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
-                return -1;
-            }
-        }
-    } else if (f->colorspace == 1) {
-        if (f->chroma_h_shift || f->chroma_v_shift) {
-            av_log(f->avctx, AV_LOG_ERROR,
-                   "chroma subsampling not supported in this colorspace\n");
-            return -1;
-        }
-        f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
-    } else {
-        av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
-        return -1;
-    }
-
-    av_dlog(f->avctx, "%d %d %d\n",
-            f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);
-
-    if (f->version < 2) {
-        context_count = read_quant_tables(c, f->quant_table);
-        if (context_count < 0) {
-            av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
-            return -1;
-        }
-    } else {
-        f->slice_count = get_symbol(c, state, 0);
-        if (f->slice_count > (unsigned)MAX_SLICES)
-            return -1;
-    }
-
-    for (j = 0; j < f->slice_count; j++) {
-        FFV1Context *fs = f->slice_context[j];
-        fs->ac = f->ac;
-
-        if (f->version >= 2) {
-            fs->slice_x      = get_symbol(c, state, 0) * f->width;
-            fs->slice_y      = get_symbol(c, state, 0) * f->height;
-            fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;
-            fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
-
-            fs->slice_x     /= f->num_h_slices;
-            fs->slice_y     /= f->num_v_slices;
-            fs->slice_width  = fs->slice_width  / f->num_h_slices - fs->slice_x;
-            fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
-            if ((unsigned)fs->slice_width  > f->width ||
-                (unsigned)fs->slice_height > f->height)
-                return -1;
-            if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width ||
-                (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
-                return -1;
-        }
-
-        for (i = 0; i < f->plane_count; i++) {
-            PlaneContext *const p = &fs->plane[i];
-
-            if (f->version >= 2) {
-                int idx = get_symbol(c, state, 0);
-                if (idx > (unsigned)f->quant_table_count) {
-                    av_log(f->avctx, AV_LOG_ERROR,
-                           "quant_table_index out of range\n");
-                    return -1;
-                }
-                p->quant_table_index = idx;
-                memcpy(p->quant_table, f->quant_tables[idx],
-                       sizeof(p->quant_table));
-                context_count = f->context_count[idx];
-            } else {
-                memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
-            }
-
-            if (p->context_count < context_count) {
-                av_freep(&p->state);
-                av_freep(&p->vlc_state);
-            }
-            p->context_count = context_count;
-        }
-    }
-
-    return 0;
-}
-
-static av_cold int decode_init(AVCodecContext *avctx)
-{
-    FFV1Context *f = avctx->priv_data;
-
-    common_init(avctx);
-
-    if (avctx->extradata && read_extra_header(f) < 0)
-        return -1;
-
-    if (init_slice_contexts(f) < 0)
-        return -1;
-
-    return 0;
-}
-
-static int decode_frame(AVCodecContext *avctx, void *data,
-                        int *data_size, AVPacket *avpkt)
-{
-    const uint8_t *buf  = avpkt->data;
-    int buf_size        = avpkt->size;
-    FFV1Context *f      = avctx->priv_data;
-    RangeCoder *const c = &f->slice_context[0]->c;
-    AVFrame *const p    = &f->picture;
-    int bytes_read, i;
-    uint8_t keystate = 128;
-    const uint8_t *buf_p;
-
-    AVFrame *picture = data;
-
-    /* release previously stored data */
-    if (p->data[0])
-        avctx->release_buffer(avctx, p);
-
-    ff_init_range_decoder(c, buf, buf_size);
-    ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
-
-    p->pict_type = AV_PICTURE_TYPE_I; // FIXME: I vs. P
-    if (get_rac(c, &keystate)) {
-        p->key_frame = 1;
-        if (read_header(f) < 0)
-            return -1;
-        if (init_slice_state(f) < 0)
-            return -1;
-
-        clear_state(f);
-    } else {
-        p->key_frame = 0;
-    }
-    if (f->ac > 1) {
-        int i;
-        for (i = 1; i < 256; i++) {
-            c->one_state[i]        = f->state_transition[i];
-            c->zero_state[256 - i] = 256 - c->one_state[i];
-        }
-    }
-
-    p->reference = 0;
-    if (avctx->get_buffer(avctx, p) < 0) {
-        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
-        return -1;
-    }
-
-    if (avctx->debug & FF_DEBUG_PICT_INFO)
-        av_log(avctx, AV_LOG_ERROR, "keyframe:%d coder:%d\n", p->key_frame, f->ac);
-
-    if (!f->ac) {
-        bytes_read = c->bytestream - c->bytestream_start - 1;
-        if (bytes_read == 0)
-            av_log(avctx, AV_LOG_ERROR, "error at end of AC stream\n"); // FIXME
-        init_get_bits(&f->slice_context[0]->gb, buf + bytes_read,
-                      (buf_size - bytes_read) * 8);
-    } else {
-        bytes_read = 0; /* avoid warning */
-    }
-
-    buf_p = buf + buf_size;
-    for (i = f->slice_count - 1; i > 0; i--) {
-        FFV1Context *fs = f->slice_context[i];
-        int v           = AV_RB24(buf_p - 3) + 3;
-        if (buf_p - buf <= v) {
-            av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
-            return -1;
-        }
-        buf_p -= v;
-        if (fs->ac)
-            ff_init_range_decoder(&fs->c, buf_p, v);
-        else
-            init_get_bits(&fs->gb, buf_p, v * 8);
-    }
-
-    avctx->execute(avctx, decode_slice, &f->slice_context[0],
-                   NULL, f->slice_count, sizeof(void *));
-    f->picture_number++;
-
-    *picture   = *p;
-    *data_size = sizeof(AVFrame);
-
-    return buf_size;
-}
-
-AVCodec ff_ffv1_decoder = {
-    .name           = "ffv1",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_FFV1,
-    .priv_data_size = sizeof(FFV1Context),
-    .init           = decode_init,
-    .close          = common_end,
-    .decode         = decode_frame,
-    .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |
-                      CODEC_CAP_SLICE_THREADS,
-    .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
-};
-
-#if CONFIG_FFV1_ENCODER
-AVCodec ff_ffv1_encoder = {
-    .name           = "ffv1",
-    .type           = AVMEDIA_TYPE_VIDEO,
-    .id             = AV_CODEC_ID_FFV1,
-    .priv_data_size = sizeof(FFV1Context),
-    .init           = encode_init,
-    .encode2        = encode_frame,
-    .close          = common_end,
-    .capabilities   = CODEC_CAP_SLICE_THREADS,
-    .pix_fmts       = (const enum AVPixelFormat[]) {
-        AV_PIX_FMT_YUV420P,   AV_PIX_FMT_YUV422P,   AV_PIX_FMT_YUV444P,
-        AV_PIX_FMT_YUV411P,   AV_PIX_FMT_YUV410P,
-        AV_PIX_FMT_YUV420P16, AV_PIX_FMT_YUV422P16, AV_PIX_FMT_YUV444P16,
-        AV_PIX_FMT_RGB32,
-        AV_PIX_FMT_NONE
-    },
-    .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
-};
-#endif