yading@10: /*
yading@10:  * FFV1 decoder
yading@10:  *
yading@10:  * Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: /**
yading@10:  * @file
yading@10:  * FF Video Codec 1 (a lossless codec) decoder
yading@10:  */
yading@10: 
yading@10: #include "libavutil/avassert.h"
yading@10: #include "libavutil/crc.h"
yading@10: #include "libavutil/opt.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "libavutil/timer.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "get_bits.h"
yading@10: #include "put_bits.h"
yading@10: #include "rangecoder.h"
yading@10: #include "golomb.h"
yading@10: #include "mathops.h"
yading@10: #include "ffv1.h"
yading@10: 
yading@10: static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
yading@10:                                                int is_signed)
yading@10: {
yading@10:     if (get_rac(c, state + 0))
yading@10:         return 0;
yading@10:     else {
yading@10:         int i, e, a;
yading@10:         e = 0;
yading@10:         while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
yading@10:             e++;
yading@10: 
yading@10:         a = 1;
yading@10:         for (i = e - 1; i >= 0; i--)
yading@10:             a += a + get_rac(c, state + 22 + FFMIN(i, 9));  // 22..31
yading@10: 
yading@10:         e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
yading@10:         return (a ^ e) - e;
yading@10:     }
yading@10: }
yading@10: 
yading@10: static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
yading@10: {
yading@10:     return get_symbol_inline(c, state, is_signed);
yading@10: }
yading@10: 
yading@10: static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
yading@10:                                  int bits)
yading@10: {
yading@10:     int k, i, v, ret;
yading@10: 
yading@10:     i = state->count;
yading@10:     k = 0;
yading@10:     while (i < state->error_sum) { // FIXME: optimize
yading@10:         k++;
yading@10:         i += i;
yading@10:     }
yading@10: 
yading@10:     v = get_sr_golomb(gb, k, 12, bits);
yading@10:     av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
yading@10:             v, state->bias, state->error_sum, state->drift, state->count, k);
yading@10: 
yading@10: #if 0 // JPEG LS
yading@10:     if (k == 0 && 2 * state->drift <= -state->count)
yading@10:         v ^= (-1);
yading@10: #else
yading@10:     v ^= ((2 * state->drift + state->count) >> 31);
yading@10: #endif
yading@10: 
yading@10:     ret = fold(v + state->bias, bits);
yading@10: 
yading@10:     update_vlc_state(state, v);
yading@10: 
yading@10:     return ret;
yading@10: }
yading@10: 
yading@10: static av_always_inline void decode_line(FFV1Context *s, int w,
yading@10:                                          int16_t *sample[2],
yading@10:                                          int plane_index, int bits)
yading@10: {
yading@10:     PlaneContext *const p = &s->plane[plane_index];
yading@10:     RangeCoder *const c   = &s->c;
yading@10:     int x;
yading@10:     int run_count = 0;
yading@10:     int run_mode  = 0;
yading@10:     int run_index = s->run_index;
yading@10: 
yading@10:     for (x = 0; x < w; x++) {
yading@10:         int diff, context, sign;
yading@10: 
yading@10:         context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
yading@10:         if (context < 0) {
yading@10:             context = -context;
yading@10:             sign    = 1;
yading@10:         } else
yading@10:             sign = 0;
yading@10: 
yading@10:         av_assert2(context < p->context_count);
yading@10: 
yading@10:         if (s->ac) {
yading@10:             diff = get_symbol_inline(c, p->state[context], 1);
yading@10:         } else {
yading@10:             if (context == 0 && run_mode == 0)
yading@10:                 run_mode = 1;
yading@10: 
yading@10:             if (run_mode) {
yading@10:                 if (run_count == 0 && run_mode == 1) {
yading@10:                     if (get_bits1(&s->gb)) {
yading@10:                         run_count = 1 << ff_log2_run[run_index];
yading@10:                         if (x + run_count <= w)
yading@10:                             run_index++;
yading@10:                     } else {
yading@10:                         if (ff_log2_run[run_index])
yading@10:                             run_count = get_bits(&s->gb, ff_log2_run[run_index]);
yading@10:                         else
yading@10:                             run_count = 0;
yading@10:                         if (run_index)
yading@10:                             run_index--;
yading@10:                         run_mode = 2;
yading@10:                     }
yading@10:                 }
yading@10:                 run_count--;
yading@10:                 if (run_count < 0) {
yading@10:                     run_mode  = 0;
yading@10:                     run_count = 0;
yading@10:                     diff      = get_vlc_symbol(&s->gb, &p->vlc_state[context],
yading@10:                                                bits);
yading@10:                     if (diff >= 0)
yading@10:                         diff++;
yading@10:                 } else
yading@10:                     diff = 0;
yading@10:             } else
yading@10:                 diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
yading@10: 
yading@10:             av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
yading@10:                     run_count, run_index, run_mode, x, get_bits_count(&s->gb));
yading@10:         }
yading@10: 
yading@10:         if (sign)
yading@10:             diff = -diff;
yading@10: 
yading@10:         sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &
yading@10:                        ((1 << bits) - 1);
yading@10:     }
yading@10:     s->run_index = run_index;
yading@10: }
yading@10: 
yading@10: static void decode_plane(FFV1Context *s, uint8_t *src,
yading@10:                          int w, int h, int stride, int plane_index)
yading@10: {
yading@10:     int x, y;
yading@10:     int16_t *sample[2];
yading@10:     sample[0] = s->sample_buffer + 3;
yading@10:     sample[1] = s->sample_buffer + w + 6 + 3;
yading@10: 
yading@10:     s->run_index = 0;
yading@10: 
yading@10:     memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
yading@10: 
yading@10:     for (y = 0; y < h; y++) {
yading@10:         int16_t *temp = sample[0]; // FIXME: try a normal buffer
yading@10: 
yading@10:         sample[0] = sample[1];
yading@10:         sample[1] = temp;
yading@10: 
yading@10:         sample[1][-1] = sample[0][0];
yading@10:         sample[0][w]  = sample[0][w - 1];
yading@10: 
yading@10: // { START_TIMER
yading@10:         if (s->avctx->bits_per_raw_sample <= 8) {
yading@10:             decode_line(s, w, sample, plane_index, 8);
yading@10:             for (x = 0; x < w; x++)
yading@10:                 src[x + stride * y] = sample[1][x];
yading@10:         } else {
yading@10:             decode_line(s, w, sample, plane_index, s->avctx->bits_per_raw_sample);
yading@10:             if (s->packed_at_lsb) {
yading@10:                 for (x = 0; x < w; x++) {
yading@10:                     ((uint16_t*)(src + stride*y))[x] = sample[1][x];
yading@10:                 }
yading@10:             } else {
yading@10:                 for (x = 0; x < w; x++) {
yading@10:                     ((uint16_t*)(src + stride*y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10: // STOP_TIMER("decode-line") }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])
yading@10: {
yading@10:     int x, y, p;
yading@10:     int16_t *sample[4][2];
yading@10:     int lbd    = s->avctx->bits_per_raw_sample <= 8;
yading@10:     int bits   = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
yading@10:     int offset = 1 << bits;
yading@10: 
yading@10:     for (x = 0; x < 4; x++) {
yading@10:         sample[x][0] = s->sample_buffer +  x * 2      * (w + 6) + 3;
yading@10:         sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;
yading@10:     }
yading@10: 
yading@10:     s->run_index = 0;
yading@10: 
yading@10:     memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));
yading@10: 
yading@10:     for (y = 0; y < h; y++) {
yading@10:         for (p = 0; p < 3 + s->transparency; p++) {
yading@10:             int16_t *temp = sample[p][0]; // FIXME: try a normal buffer
yading@10: 
yading@10:             sample[p][0] = sample[p][1];
yading@10:             sample[p][1] = temp;
yading@10: 
yading@10:             sample[p][1][-1]= sample[p][0][0  ];
yading@10:             sample[p][0][ w]= sample[p][0][w-1];
yading@10:             if (lbd)
yading@10:                 decode_line(s, w, sample[p], (p + 1)/2, 9);
yading@10:             else
yading@10:                 decode_line(s, w, sample[p], (p + 1)/2, bits + 1);
yading@10:         }
yading@10:         for (x = 0; x < w; x++) {
yading@10:             int g = sample[0][1][x];
yading@10:             int b = sample[1][1][x];
yading@10:             int r = sample[2][1][x];
yading@10:             int a = sample[3][1][x];
yading@10: 
yading@10:             b -= offset;
yading@10:             r -= offset;
yading@10:             g -= (b + r) >> 2;
yading@10:             b += g;
yading@10:             r += g;
yading@10: 
yading@10:             if (lbd)
yading@10:                 *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
yading@10:             else {
yading@10:                 *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
yading@10:                 *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
yading@10:                 *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
yading@10: {
yading@10:     RangeCoder *c = &fs->c;
yading@10:     uint8_t state[CONTEXT_SIZE];
yading@10:     unsigned ps, i, context_count;
yading@10:     memset(state, 128, sizeof(state));
yading@10: 
yading@10:     av_assert0(f->version > 2);
yading@10: 
yading@10:     fs->slice_x      =  get_symbol(c, state, 0)      * f->width ;
yading@10:     fs->slice_y      =  get_symbol(c, state, 0)      * f->height;
yading@10:     fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;
yading@10:     fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
yading@10: 
yading@10:     fs->slice_x /= f->num_h_slices;
yading@10:     fs->slice_y /= f->num_v_slices;
yading@10:     fs->slice_width  = fs->slice_width /f->num_h_slices - fs->slice_x;
yading@10:     fs->slice_height = fs->slice_height/f->num_v_slices - fs->slice_y;
yading@10:     if ((unsigned)fs->slice_width > f->width || (unsigned)fs->slice_height > f->height)
yading@10:         return -1;
yading@10:     if (    (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width
yading@10:          || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
yading@10:         return -1;
yading@10: 
yading@10:     for (i = 0; i < f->plane_count; i++) {
yading@10:         PlaneContext * const p = &fs->plane[i];
yading@10:         int idx = get_symbol(c, state, 0);
yading@10:         if (idx > (unsigned)f->quant_table_count) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
yading@10:             return -1;
yading@10:         }
yading@10:         p->quant_table_index = idx;
yading@10:         memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
yading@10:         context_count = f->context_count[idx];
yading@10: 
yading@10:         if (p->context_count < context_count) {
yading@10:             av_freep(&p->state);
yading@10:             av_freep(&p->vlc_state);
yading@10:         }
yading@10:         p->context_count = context_count;
yading@10:     }
yading@10: 
yading@10:     ps = get_symbol(c, state, 0);
yading@10:     if (ps == 1) {
yading@10:         f->cur->interlaced_frame = 1;
yading@10:         f->cur->top_field_first  = 1;
yading@10:     } else if (ps == 2) {
yading@10:         f->cur->interlaced_frame = 1;
yading@10:         f->cur->top_field_first  = 0;
yading@10:     } else if (ps == 3) {
yading@10:         f->cur->interlaced_frame = 0;
yading@10:     }
yading@10:     f->cur->sample_aspect_ratio.num = get_symbol(c, state, 0);
yading@10:     f->cur->sample_aspect_ratio.den = get_symbol(c, state, 0);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_slice(AVCodecContext *c, void *arg)
yading@10: {
yading@10:     FFV1Context *fs   = *(void **)arg;
yading@10:     FFV1Context *f    = fs->avctx->priv_data;
yading@10:     int width, height, x, y, ret;
yading@10:     const int ps      = av_pix_fmt_desc_get(c->pix_fmt)->comp[0].step_minus1 + 1;
yading@10:     AVFrame * const p = f->cur;
yading@10: 
yading@10:     if (f->version > 2) {
yading@10:         if (ffv1_init_slice_state(f, fs) < 0)
yading@10:             return AVERROR(ENOMEM);
yading@10:         if (decode_slice_header(f, fs) < 0) {
yading@10:             fs->slice_damaged = 1;
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10:     if ((ret = ffv1_init_slice_state(f, fs)) < 0)
yading@10:         return ret;
yading@10:     if (f->cur->key_frame)
yading@10:         ffv1_clear_slice_state(f, fs);
yading@10: 
yading@10:     width  = fs->slice_width;
yading@10:     height = fs->slice_height;
yading@10:     x      = fs->slice_x;
yading@10:     y      = fs->slice_y;
yading@10: 
yading@10:     if (!fs->ac) {
yading@10:         if (f->version == 3 && f->minor_version > 1 || f->version > 3)
yading@10:             get_rac(&fs->c, (uint8_t[]) { 129 });
yading@10:         fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;
yading@10:         init_get_bits(&fs->gb,
yading@10:                       fs->c.bytestream_start + fs->ac_byte_count,
yading@10:                       (fs->c.bytestream_end - fs->c.bytestream_start - fs->ac_byte_count) * 8);
yading@10:     }
yading@10: 
yading@10:     av_assert1(width && height);
yading@10:     if (f->colorspace == 0) {
yading@10:         const int chroma_width  = -((-width) >> f->chroma_h_shift);
yading@10:         const int chroma_height = -((-height) >> f->chroma_v_shift);
yading@10:         const int cx            = x >> f->chroma_h_shift;
yading@10:         const int cy            = y >> f->chroma_v_shift;
yading@10:         decode_plane(fs, p->data[0] + ps*x + y*p->linesize[0], width, height, p->linesize[0], 0);
yading@10: 
yading@10:         if (f->chroma_planes) {
yading@10:             decode_plane(fs, p->data[1] + ps*cx+cy*p->linesize[1], chroma_width, chroma_height, p->linesize[1], 1);
yading@10:             decode_plane(fs, p->data[2] + ps*cx+cy*p->linesize[2], chroma_width, chroma_height, p->linesize[2], 1);
yading@10:         }
yading@10:         if (fs->transparency)
yading@10:             decode_plane(fs, p->data[3] + ps*x + y*p->linesize[3], width, height, p->linesize[3], 2);
yading@10:     } else {
yading@10:         uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],
yading@10:                                p->data[1] + ps * x + y * p->linesize[1],
yading@10:                                p->data[2] + ps * x + y * p->linesize[2] };
yading@10:         decode_rgb_frame(fs, planes, width, height, p->linesize);
yading@10:     }
yading@10:     if (fs->ac && f->version > 2) {
yading@10:         int v;
yading@10:         get_rac(&fs->c, (uint8_t[]) { 129 });
yading@10:         v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5*f->ec;
yading@10:         if (v) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n", v);
yading@10:             fs->slice_damaged = 1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     emms_c();
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
yading@10: {
yading@10:     int v;
yading@10:     int i = 0;
yading@10:     uint8_t state[CONTEXT_SIZE];
yading@10: 
yading@10:     memset(state, 128, sizeof(state));
yading@10: 
yading@10:     for (v = 0; i < 128; v++) {
yading@10:         unsigned len = get_symbol(c, state, 0) + 1;
yading@10: 
yading@10:         if (len > 128 - i)
yading@10:             return AVERROR_INVALIDDATA;
yading@10: 
yading@10:         while (len--) {
yading@10:             quant_table[i] = scale * v;
yading@10:             i++;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     for (i = 1; i < 128; i++)
yading@10:         quant_table[256 - i] = -quant_table[i];
yading@10:     quant_table[128] = -quant_table[127];
yading@10: 
yading@10:     return 2 * v - 1;
yading@10: }
yading@10: 
yading@10: static int read_quant_tables(RangeCoder *c,
yading@10:                              int16_t quant_table[MAX_CONTEXT_INPUTS][256])
yading@10: {
yading@10:     int i;
yading@10:     int context_count = 1;
yading@10: 
yading@10:     for (i = 0; i < 5; i++) {
yading@10:         context_count *= read_quant_table(c, quant_table[i], context_count);
yading@10:         if (context_count > 32768U) {
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10:     return (context_count + 1) / 2;
yading@10: }
yading@10: 
yading@10: static int read_extra_header(FFV1Context *f)
yading@10: {
yading@10:     RangeCoder *const c = &f->c;
yading@10:     uint8_t state[CONTEXT_SIZE];
yading@10:     int i, j, k, ret;
yading@10:     uint8_t state2[32][CONTEXT_SIZE];
yading@10: 
yading@10:     memset(state2, 128, sizeof(state2));
yading@10:     memset(state, 128, sizeof(state));
yading@10: 
yading@10:     ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
yading@10:     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
yading@10: 
yading@10:     f->version = get_symbol(c, state, 0);
yading@10:     if (f->version > 2) {
yading@10:         c->bytestream_end -= 4;
yading@10:         f->minor_version = get_symbol(c, state, 0);
yading@10:     }
yading@10:     f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
yading@10:     if (f->ac > 1) {
yading@10:         for (i = 1; i < 256; i++)
yading@10:             f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
yading@10:     }
yading@10: 
yading@10:     f->colorspace                 = get_symbol(c, state, 0); //YUV cs type
yading@10:     f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
yading@10:     f->chroma_planes              = get_rac(c, state);
yading@10:     f->chroma_h_shift             = get_symbol(c, state, 0);
yading@10:     f->chroma_v_shift             = get_symbol(c, state, 0);
yading@10:     f->transparency               = get_rac(c, state);
yading@10:     f->plane_count                = 2 + f->transparency;
yading@10:     f->num_h_slices               = 1 + get_symbol(c, state, 0);
yading@10:     f->num_v_slices               = 1 + get_symbol(c, state, 0);
yading@10: 
yading@10:     if (f->num_h_slices > (unsigned)f->width  || !f->num_h_slices ||
yading@10:         f->num_v_slices > (unsigned)f->height || !f->num_v_slices
yading@10:        ) {
yading@10:         av_log(f->avctx, AV_LOG_ERROR, "slice count invalid\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     f->quant_table_count = get_symbol(c, state, 0);
yading@10:     if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
yading@10:         return AVERROR_INVALIDDATA;
yading@10: 
yading@10:     for (i = 0; i < f->quant_table_count; i++) {
yading@10:         f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
yading@10:         if (f->context_count[i] < 0) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10:     if ((ret = ffv1_allocate_initial_states(f)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     for (i = 0; i < f->quant_table_count; i++)
yading@10:         if (get_rac(c, state)) {
yading@10:             for (j = 0; j < f->context_count[i]; j++)
yading@10:                 for (k = 0; k < CONTEXT_SIZE; k++) {
yading@10:                     int pred = j ? f->initial_states[i][j - 1][k] : 128;
yading@10:                     f->initial_states[i][j][k] =
yading@10:                         (pred + get_symbol(c, state2[k], 1)) & 0xFF;
yading@10:                 }
yading@10:         }
yading@10: 
yading@10:     if (f->version > 2) {
yading@10:         f->ec = get_symbol(c, state, 0);
yading@10:     }
yading@10: 
yading@10:     if (f->version > 2) {
yading@10:         unsigned v;
yading@10:         v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
yading@10:                    f->avctx->extradata, f->avctx->extradata_size);
yading@10:         if (v) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int read_header(FFV1Context *f)
yading@10: {
yading@10:     uint8_t state[CONTEXT_SIZE];
yading@10:     int i, j, context_count = -1; //-1 to avoid warning
yading@10:     RangeCoder *const c = &f->slice_context[0]->c;
yading@10: 
yading@10:     memset(state, 128, sizeof(state));
yading@10: 
yading@10:     if (f->version < 2) {
yading@10:         unsigned v= get_symbol(c, state, 0);
yading@10:         if (v >= 2) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "invalid version %d in ver01 header\n", v);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         f->version = v;
yading@10:         f->ac      = f->avctx->coder_type = get_symbol(c, state, 0);
yading@10:         if (f->ac > 1) {
yading@10:             for (i = 1; i < 256; i++)
yading@10:                 f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
yading@10:         }
yading@10: 
yading@10:         f->colorspace = get_symbol(c, state, 0); //YUV cs type
yading@10: 
yading@10:         if (f->version > 0)
yading@10:             f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
yading@10: 
yading@10:         f->chroma_planes  = get_rac(c, state);
yading@10:         f->chroma_h_shift = get_symbol(c, state, 0);
yading@10:         f->chroma_v_shift = get_symbol(c, state, 0);
yading@10:         f->transparency   = get_rac(c, state);
yading@10:         f->plane_count    = 2 + f->transparency;
yading@10:     }
yading@10: 
yading@10:     if (f->colorspace == 0) {
yading@10:         if (!f->transparency && !f->chroma_planes) {
yading@10:             if (f->avctx->bits_per_raw_sample <= 8)
yading@10:                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
yading@10:             else
yading@10:                 f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
yading@10:         } else if (f->avctx->bits_per_raw_sample<=8 && !f->transparency) {
yading@10:             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
yading@10:             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P; break;
yading@10:             case 0x01: f->avctx->pix_fmt = AV_PIX_FMT_YUV440P; break;
yading@10:             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P; break;
yading@10:             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P; break;
yading@10:             case 0x20: f->avctx->pix_fmt = AV_PIX_FMT_YUV411P; break;
yading@10:             case 0x22: f->avctx->pix_fmt = AV_PIX_FMT_YUV410P; break;
yading@10:             default:
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
yading@10:                 return AVERROR(ENOSYS);
yading@10:             }
yading@10:         } else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
yading@10:             switch(16*f->chroma_h_shift + f->chroma_v_shift) {
yading@10:             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P; break;
yading@10:             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P; break;
yading@10:             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P; break;
yading@10:             default:
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
yading@10:                 return AVERROR(ENOSYS);
yading@10:             }
yading@10:         } else if (f->avctx->bits_per_raw_sample == 9) {
yading@10:             f->packed_at_lsb = 1;
yading@10:             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
yading@10:             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9; break;
yading@10:             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9; break;
yading@10:             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9; break;
yading@10:             default:
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
yading@10:                 return AVERROR(ENOSYS);
yading@10:             }
yading@10:         } else if (f->avctx->bits_per_raw_sample == 10) {
yading@10:             f->packed_at_lsb = 1;
yading@10:             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
yading@10:             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10; break;
yading@10:             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10; break;
yading@10:             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10; break;
yading@10:             default:
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
yading@10:                 return AVERROR(ENOSYS);
yading@10:             }
yading@10:         } else {
yading@10:             switch(16 * f->chroma_h_shift + f->chroma_v_shift) {
yading@10:             case 0x00: f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16; break;
yading@10:             case 0x10: f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16; break;
yading@10:             case 0x11: f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16; break;
yading@10:             default:
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
yading@10:                 return AVERROR(ENOSYS);
yading@10:             }
yading@10:         }
yading@10:     } else if (f->colorspace == 1) {
yading@10:         if (f->chroma_h_shift || f->chroma_v_shift) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR,
yading@10:                    "chroma subsampling not supported in this colorspace\n");
yading@10:             return AVERROR(ENOSYS);
yading@10:         }
yading@10:         if (     f->avctx->bits_per_raw_sample ==  9)
yading@10:             f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
yading@10:         else if (f->avctx->bits_per_raw_sample == 10)
yading@10:             f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
yading@10:         else if (f->avctx->bits_per_raw_sample == 12)
yading@10:             f->avctx->pix_fmt = AV_PIX_FMT_GBRP12;
yading@10:         else if (f->avctx->bits_per_raw_sample == 14)
yading@10:             f->avctx->pix_fmt = AV_PIX_FMT_GBRP14;
yading@10:         else
yading@10:         if (f->transparency) f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
yading@10:         else                 f->avctx->pix_fmt = AV_PIX_FMT_0RGB32;
yading@10:     } else {
yading@10:         av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
yading@10:         return AVERROR(ENOSYS);
yading@10:     }
yading@10: 
yading@10:     av_dlog(f->avctx, "%d %d %d\n",
yading@10:             f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);
yading@10:     if (f->version < 2) {
yading@10:         context_count = read_quant_tables(c, f->quant_table);
yading@10:         if (context_count < 0) {
yading@10:             av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:     } else if (f->version < 3) {
yading@10:         f->slice_count = get_symbol(c, state, 0);
yading@10:     } else {
yading@10:         const uint8_t *p = c->bytestream_end;
yading@10:         for (f->slice_count = 0;
yading@10:              f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;
yading@10:              f->slice_count++) {
yading@10:             int trailer = 3 + 5*!!f->ec;
yading@10:             int size = AV_RB24(p-trailer);
yading@10:             if (size + trailer > p - c->bytestream_start)
yading@10:                 break;
yading@10:             p -= size + trailer;
yading@10:         }
yading@10:     }
yading@10:     if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {
yading@10:         av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n", f->slice_count);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     for (j = 0; j < f->slice_count; j++) {
yading@10:         FFV1Context *fs = f->slice_context[j];
yading@10:         fs->ac            = f->ac;
yading@10:         fs->packed_at_lsb = f->packed_at_lsb;
yading@10: 
yading@10:         fs->slice_damaged = 0;
yading@10: 
yading@10:         if (f->version == 2) {
yading@10:             fs->slice_x      =  get_symbol(c, state, 0)      * f->width ;
yading@10:             fs->slice_y      =  get_symbol(c, state, 0)      * f->height;
yading@10:             fs->slice_width  = (get_symbol(c, state, 0) + 1) * f->width  + fs->slice_x;
yading@10:             fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
yading@10: 
yading@10:             fs->slice_x     /= f->num_h_slices;
yading@10:             fs->slice_y     /= f->num_v_slices;
yading@10:             fs->slice_width  = fs->slice_width  / f->num_h_slices - fs->slice_x;
yading@10:             fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
yading@10:             if ((unsigned)fs->slice_width  > f->width ||
yading@10:                 (unsigned)fs->slice_height > f->height)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             if (   (unsigned)fs->slice_x + (uint64_t)fs->slice_width  > f->width
yading@10:                 || (unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:         }
yading@10: 
yading@10:         for (i = 0; i < f->plane_count; i++) {
yading@10:             PlaneContext *const p = &fs->plane[i];
yading@10: 
yading@10:             if (f->version == 2) {
yading@10:                 int idx = get_symbol(c, state, 0);
yading@10:                 if (idx > (unsigned)f->quant_table_count) {
yading@10:                     av_log(f->avctx, AV_LOG_ERROR,
yading@10:                            "quant_table_index out of range\n");
yading@10:                     return AVERROR_INVALIDDATA;
yading@10:                 }
yading@10:                 p->quant_table_index = idx;
yading@10:                 memcpy(p->quant_table, f->quant_tables[idx],
yading@10:                        sizeof(p->quant_table));
yading@10:                 context_count = f->context_count[idx];
yading@10:             } else {
yading@10:                 memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
yading@10:             }
yading@10: 
yading@10:             if (f->version <= 2) {
yading@10:                 av_assert0(context_count >= 0);
yading@10:                 if (p->context_count < context_count) {
yading@10:                     av_freep(&p->state);
yading@10:                     av_freep(&p->vlc_state);
yading@10:                 }
yading@10:                 p->context_count = context_count;
yading@10:             }
yading@10:         }
yading@10:     }
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int decode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     FFV1Context *f = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ffv1_common_init(avctx)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (avctx->extradata && (ret = read_extra_header(f)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if ((ret = ffv1_init_slice_contexts(f)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
yading@10: {
yading@10:     const uint8_t *buf  = avpkt->data;
yading@10:     int buf_size        = avpkt->size;
yading@10:     FFV1Context *f      = avctx->priv_data;
yading@10:     RangeCoder *const c = &f->slice_context[0]->c;
yading@10:     int i, ret;
yading@10:     uint8_t keystate = 128;
yading@10:     const uint8_t *buf_p;
yading@10:     AVFrame *const p    = data;
yading@10: 
yading@10:     f->cur = p;
yading@10: 
yading@10:     ff_init_range_decoder(c, buf, buf_size);
yading@10:     ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
yading@10: 
yading@10:     p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
yading@10:     if (get_rac(c, &keystate)) {
yading@10:         p->key_frame    = 1;
yading@10:         f->key_frame_ok = 0;
yading@10:         if ((ret = read_header(f)) < 0)
yading@10:             return ret;
yading@10:         f->key_frame_ok = 1;
yading@10:     } else {
yading@10:         if (!f->key_frame_ok) {
yading@10:             av_log(avctx, AV_LOG_ERROR,
yading@10:                    "Cannot decode non-keyframe without valid keyframe\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         p->key_frame = 0;
yading@10:     }
yading@10: 
yading@10:     if ((ret = ff_get_buffer(avctx, p, AV_GET_BUFFER_FLAG_REF)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (avctx->debug & FF_DEBUG_PICT_INFO)
yading@10:         av_log(avctx, AV_LOG_DEBUG, "ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
yading@10:                f->version, p->key_frame, f->ac, f->ec, f->slice_count, f->avctx->bits_per_raw_sample);
yading@10: 
yading@10:     buf_p = buf + buf_size;
yading@10:     for (i = f->slice_count - 1; i >= 0; i--) {
yading@10:         FFV1Context *fs = f->slice_context[i];
yading@10:         int trailer = 3 + 5*!!f->ec;
yading@10:         int v;
yading@10: 
yading@10:         if (i || f->version > 2) v = AV_RB24(buf_p-trailer) + trailer;
yading@10:         else                     v = buf_p - c->bytestream_start;
yading@10:         if (buf_p - c->bytestream_start < v) {
yading@10:             av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         buf_p -= v;
yading@10: 
yading@10:         if (f->ec) {
yading@10:             unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);
yading@10:             if (crc) {
yading@10:                 int64_t ts = avpkt->pts != AV_NOPTS_VALUE ? avpkt->pts : avpkt->dts;
yading@10:                 av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!", crc);
yading@10:                 if (ts != AV_NOPTS_VALUE && avctx->pkt_timebase.num) {
yading@10:                     av_log(f->avctx, AV_LOG_ERROR, "at %f seconds\n", ts*av_q2d(avctx->pkt_timebase));
yading@10:                 } else if (ts != AV_NOPTS_VALUE) {
yading@10:                     av_log(f->avctx, AV_LOG_ERROR, "at %"PRId64"\n", ts);
yading@10:                 } else {
yading@10:                     av_log(f->avctx, AV_LOG_ERROR, "\n");
yading@10:                 }
yading@10:                 fs->slice_damaged = 1;
yading@10:             }
yading@10:         }
yading@10: 
yading@10:         if (i) {
yading@10:             ff_init_range_decoder(&fs->c, buf_p, v);
yading@10:         } else
yading@10:             fs->c.bytestream_end = (uint8_t *)(buf_p + v);
yading@10: 
yading@10:         fs->cur = p;
yading@10:     }
yading@10: 
yading@10:     avctx->execute(avctx,
yading@10:                    decode_slice,
yading@10:                    &f->slice_context[0],
yading@10:                    NULL,
yading@10:                    f->slice_count,
yading@10:                    sizeof(void*));
yading@10: 
yading@10:     for (i = f->slice_count - 1; i >= 0; i--) {
yading@10:         FFV1Context *fs = f->slice_context[i];
yading@10:         int j;
yading@10:         if (fs->slice_damaged && f->last_picture.data[0]) {
yading@10:             const uint8_t *src[4];
yading@10:             uint8_t *dst[4];
yading@10:             for (j = 0; j < 4; j++) {
yading@10:                 int sh = (j==1 || j==2) ? f->chroma_h_shift : 0;
yading@10:                 int sv = (j==1 || j==2) ? f->chroma_v_shift : 0;
yading@10:                 dst[j] = p->data[j] + p->linesize[j]*
yading@10:                          (fs->slice_y>>sv) + (fs->slice_x>>sh);
yading@10:                 src[j] = f->last_picture.data[j] + f->last_picture.linesize[j]*
yading@10:                          (fs->slice_y>>sv) + (fs->slice_x>>sh);
yading@10:             }
yading@10:             av_image_copy(dst, p->linesize, (const uint8_t **)src,
yading@10:                           f->last_picture.linesize,
yading@10:                           avctx->pix_fmt,
yading@10:                           fs->slice_width,
yading@10:                           fs->slice_height);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     f->picture_number++;
yading@10: 
yading@10:     av_frame_unref(&f->last_picture);
yading@10:     if ((ret = av_frame_ref(&f->last_picture, p)) < 0)
yading@10:         return ret;
yading@10:     f->cur = NULL;
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return buf_size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_ffv1_decoder = {
yading@10:     .name           = "ffv1",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_FFV1,
yading@10:     .priv_data_size = sizeof(FFV1Context),
yading@10:     .init           = decode_init,
yading@10:     .close          = ffv1_close,
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |
yading@10:                       CODEC_CAP_SLICE_THREADS,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),
yading@10: };