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* Copyright (c) 2003-2012 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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* FF Video Codec 1 (a lossless codec) decoder
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#include "libavutil/avassert.h"
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#include "libavutil/pixdesc.h"
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#include "libavutil/crc.h"
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#include "libavutil/opt.h"
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#include "libavutil/imgutils.h"
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#include "rangecoder.h"
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static inline av_flatten int get_symbol_inline(RangeCoder *c, uint8_t *state,
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if (get_rac(c, state + 0))
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while (get_rac(c, state + 1 + FFMIN(e, 9))) // 1..10
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for (i = e - 1; i >= 0; i--)
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a += a + get_rac(c, state + 22 + FFMIN(i, 9)); // 22..31
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e = -(is_signed && get_rac(c, state + 11 + FFMIN(e, 10))); // 11..21
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static av_noinline int get_symbol(RangeCoder *c, uint8_t *state, int is_signed)
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return get_symbol_inline(c, state, is_signed);
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static inline int get_vlc_symbol(GetBitContext *gb, VlcState *const state,
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while (i < state->error_sum) { // FIXME: optimize
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v = get_sr_golomb(gb, k, 12, bits);
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av_dlog(NULL, "v:%d bias:%d error:%d drift:%d count:%d k:%d",
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v, state->bias, state->error_sum, state->drift, state->count, k);
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if (k == 0 && 2 * state->drift <= -state->count)
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v ^= ((2 * state->drift + state->count) >> 31);
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ret = fold(v + state->bias, bits);
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update_vlc_state(state, v);
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static av_always_inline void decode_line(FFV1Context *s, int w,
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int plane_index, int bits)
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PlaneContext *const p = &s->plane[plane_index];
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RangeCoder *const c = &s->c;
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int run_index = s->run_index;
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for (x = 0; x < w; x++) {
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int diff, context, sign;
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context = get_context(p, sample[1] + x, sample[0] + x, sample[1] + x);
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av_assert2(context < p->context_count);
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diff = get_symbol_inline(c, p->state[context], 1);
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if (context == 0 && run_mode == 0)
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if (run_count == 0 && run_mode == 1) {
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if (get_bits1(&s->gb)) {
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run_count = 1 << ff_log2_run[run_index];
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if (x + run_count <= w)
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if (ff_log2_run[run_index])
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run_count = get_bits(&s->gb, ff_log2_run[run_index]);
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diff = get_vlc_symbol(&s->gb, &p->vlc_state[context],
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diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
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av_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
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run_count, run_index, run_mode, x, get_bits_count(&s->gb));
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sample[1][x] = (predict(sample[1] + x, sample[0] + x) + diff) &
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s->run_index = run_index;
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static void decode_plane(FFV1Context *s, uint8_t *src,
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int w, int h, int stride, int plane_index)
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sample[0] = s->sample_buffer + 3;
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sample[1] = s->sample_buffer + w + 6 + 3;
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memset(s->sample_buffer, 0, 2 * (w + 6) * sizeof(*s->sample_buffer));
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for (y = 0; y < h; y++) {
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int16_t *temp = sample[0]; // FIXME: try a normal buffer
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sample[0] = sample[1];
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sample[1][-1] = sample[0][0];
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sample[0][w] = sample[0][w - 1];
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if (s->avctx->bits_per_raw_sample <= 8) {
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decode_line(s, w, sample, plane_index, 8);
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for (x = 0; x < w; x++)
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src[x + stride * y] = sample[1][x];
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decode_line(s, w, sample, plane_index,
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s->avctx->bits_per_raw_sample);
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if (s->packed_at_lsb) {
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for (x = 0; x < w; x++)
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((uint16_t *)(src + stride * y))[x] = sample[1][x];
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for (x = 0; x < w; x++)
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((uint16_t *)(src + stride * y))[x] = sample[1][x] << (16 - s->avctx->bits_per_raw_sample);
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// STOP_TIMER("decode-line") }
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static void decode_rgb_frame(FFV1Context *s, uint8_t *src[3], int w, int h,
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int16_t *sample[4][2];
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int lbd = s->avctx->bits_per_raw_sample <= 8;
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int bits = s->avctx->bits_per_raw_sample > 0
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? s->avctx->bits_per_raw_sample
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int offset = 1 << bits;
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for (x = 0; x < 4; x++) {
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sample[x][0] = s->sample_buffer + x * 2 * (w + 6) + 3;
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sample[x][1] = s->sample_buffer + (x * 2 + 1) * (w + 6) + 3;
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memset(s->sample_buffer, 0, 8 * (w + 6) * sizeof(*s->sample_buffer));
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for (y = 0; y < h; y++) {
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for (p = 0; p < 3 + s->transparency; p++) {
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int16_t *temp = sample[p][0]; //FIXME try a normal buffer
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sample[p][0] = sample[p][1];
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sample[p][1][-1] = sample[p][0][0];
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sample[p][0][w] = sample[p][0][w - 1];
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decode_line(s, w, sample[p], (p + 1) / 2, 9);
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decode_line(s, w, sample[p], (p + 1) / 2, bits + 1);
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for (x = 0; x < w; x++) {
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int g = sample[0][1][x];
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int b = sample[1][1][x];
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int r = sample[2][1][x];
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int a = sample[3][1][x];
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*((uint32_t *)(src[0] + x * 4 + stride[0] * y)) = b +
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(g << 8) + (r << 16) + (a << 24);
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*((uint16_t *)(src[0] + x * 2 + stride[0] * y)) = b;
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*((uint16_t *)(src[1] + x * 2 + stride[1] * y)) = g;
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*((uint16_t *)(src[2] + x * 2 + stride[2] * y)) = r;
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static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
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RangeCoder *c = &fs->c;
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uint8_t state[CONTEXT_SIZE];
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unsigned ps, i, context_count;
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memset(state, 128, sizeof(state));
278
for (i = 1; i < 256; i++) {
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fs->c.one_state[i] = f->state_transition[i];
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fs->c.zero_state[256 - i] = 256 - fs->c.one_state[i];
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fs->slice_x = get_symbol(c, state, 0) * f->width;
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fs->slice_y = get_symbol(c, state, 0) * f->height;
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fs->slice_width = (get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
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fs->slice_height = (get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
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fs->slice_x /= f->num_h_slices;
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fs->slice_y /= f->num_v_slices;
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fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x;
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fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
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if ((unsigned)fs->slice_width > f->width ||
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(unsigned)fs->slice_height > f->height)
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return AVERROR_INVALIDDATA;
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if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width ||
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(unsigned)fs->slice_y + (uint64_t)fs->slice_height > f->height)
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return AVERROR_INVALIDDATA;
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for (i = 0; i < f->plane_count; i++) {
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PlaneContext *const p = &fs->plane[i];
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int idx = get_symbol(c, state, 0);
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if (idx > (unsigned)f->quant_table_count) {
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av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
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return AVERROR_INVALIDDATA;
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p->quant_table_index = idx;
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memcpy(p->quant_table, f->quant_tables[idx], sizeof(p->quant_table));
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context_count = f->context_count[idx];
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if (p->context_count < context_count) {
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av_freep(&p->vlc_state);
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p->context_count = context_count;
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ps = get_symbol(c, state, 0);
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f->picture.interlaced_frame = 1;
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f->picture.top_field_first = 1;
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} else if (ps == 2) {
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f->picture.interlaced_frame = 1;
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f->picture.top_field_first = 0;
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} else if (ps == 3) {
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f->picture.interlaced_frame = 0;
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f->picture.sample_aspect_ratio.num = get_symbol(c, state, 0);
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f->picture.sample_aspect_ratio.den = get_symbol(c, state, 0);
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static int decode_slice(AVCodecContext *c, void *arg)
336
FFV1Context *fs = *(void **)arg;
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FFV1Context *f = fs->avctx->priv_data;
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int width, height, x, y, ret;
339
const int ps = (av_pix_fmt_desc_get(c->pix_fmt)->flags & PIX_FMT_PLANAR)
340
? (c->bits_per_raw_sample > 8) + 1
342
AVFrame *const p = &f->picture;
344
if (f->version > 2) {
345
if (decode_slice_header(f, fs) < 0) {
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fs->slice_damaged = 1;
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return AVERROR_INVALIDDATA;
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if ((ret = ffv1_init_slice_state(f, fs)) < 0)
352
if (f->picture.key_frame)
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ffv1_clear_slice_state(f, fs);
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width = fs->slice_width;
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height = fs->slice_height;
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if (f->version == 3 && f->minor_version > 1 || f->version > 3)
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get_rac(&fs->c, (uint8_t[]) { 129 });
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fs->ac_byte_count = f->version > 2 || (!x && !y) ? fs->c.bytestream - fs->c.bytestream_start - 1 : 0;
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init_get_bits(&fs->gb, fs->c.bytestream_start + fs->ac_byte_count,
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(fs->c.bytestream_end - fs->c.bytestream_start -
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fs->ac_byte_count) * 8);
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av_assert1(width && height);
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if (f->colorspace == 0) {
370
const int chroma_width = -((-width) >> f->chroma_h_shift);
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const int chroma_height = -((-height) >> f->chroma_v_shift);
372
const int cx = x >> f->chroma_h_shift;
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const int cy = y >> f->chroma_v_shift;
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decode_plane(fs, p->data[0] + ps * x + y * p->linesize[0], width,
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height, p->linesize[0],
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if (f->chroma_planes) {
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decode_plane(fs, p->data[1] + ps * cx + cy * p->linesize[1],
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chroma_width, chroma_height, p->linesize[1],
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decode_plane(fs, p->data[2] + ps * cx + cy * p->linesize[2],
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chroma_width, chroma_height, p->linesize[2],
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if (fs->transparency)
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decode_plane(fs, p->data[3] + ps * x + y * p->linesize[3], width,
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height, p->linesize[3],
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uint8_t *planes[3] = { p->data[0] + ps * x + y * p->linesize[0],
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p->data[1] + ps * x + y * p->linesize[1],
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p->data[2] + ps * x + y * p->linesize[2] };
394
decode_rgb_frame(fs, planes, width, height, p->linesize);
396
if (fs->ac && f->version > 2) {
398
get_rac(&fs->c, (uint8_t[]) { 129 });
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v = fs->c.bytestream_end - fs->c.bytestream - 2 - 5 * f->ec;
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av_log(f->avctx, AV_LOG_ERROR, "bytestream end mismatching by %d\n",
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fs->slice_damaged = 1;
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static int read_quant_table(RangeCoder *c, int16_t *quant_table, int scale)
416
uint8_t state[CONTEXT_SIZE];
418
memset(state, 128, sizeof(state));
420
for (v = 0; i < 128; v++) {
421
unsigned len = get_symbol(c, state, 0) + 1;
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quant_table[i] = scale * v;
432
for (i = 1; i < 128; i++)
433
quant_table[256 - i] = -quant_table[i];
434
quant_table[128] = -quant_table[127];
439
static int read_quant_tables(RangeCoder *c,
440
int16_t quant_table[MAX_CONTEXT_INPUTS][256])
443
int context_count = 1;
445
for (i = 0; i < 5; i++) {
446
context_count *= read_quant_table(c, quant_table[i], context_count);
447
if (context_count > 32768U) {
451
return (context_count + 1) / 2;
454
static int read_extra_header(FFV1Context *f)
456
RangeCoder *const c = &f->c;
457
uint8_t state[CONTEXT_SIZE];
459
uint8_t state2[32][CONTEXT_SIZE];
461
memset(state2, 128, sizeof(state2));
462
memset(state, 128, sizeof(state));
464
ff_init_range_decoder(c, f->avctx->extradata, f->avctx->extradata_size);
465
ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
467
f->version = get_symbol(c, state, 0);
468
if (f->version > 2) {
469
c->bytestream_end -= 4;
470
f->minor_version = get_symbol(c, state, 0);
472
f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
475
for (i = 1; i < 256; i++)
476
f->state_transition[i] = get_symbol(c, state, 1) + c->one_state[i];
479
f->colorspace = get_symbol(c, state, 0); //YUV cs type
480
f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
481
f->chroma_planes = get_rac(c, state);
482
f->chroma_h_shift = get_symbol(c, state, 0);
483
f->chroma_v_shift = get_symbol(c, state, 0);
484
f->transparency = get_rac(c, state);
485
f->plane_count = 2 + f->transparency;
486
f->num_h_slices = 1 + get_symbol(c, state, 0);
487
f->num_v_slices = 1 + get_symbol(c, state, 0);
489
if (f->num_h_slices > (unsigned)f->width ||
490
f->num_v_slices > (unsigned)f->height) {
491
av_log(f->avctx, AV_LOG_ERROR, "too many slices\n");
492
return AVERROR_INVALIDDATA;
495
f->quant_table_count = get_symbol(c, state, 0);
496
if (f->quant_table_count > (unsigned)MAX_QUANT_TABLES)
497
return AVERROR_INVALIDDATA;
498
for (i = 0; i < f->quant_table_count; i++) {
499
f->context_count[i] = read_quant_tables(c, f->quant_tables[i]);
500
if (f->context_count[i] < 0) {
501
av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
502
return AVERROR_INVALIDDATA;
505
if ((ret = ffv1_allocate_initial_states(f)) < 0)
508
for (i = 0; i < f->quant_table_count; i++)
509
if (get_rac(c, state)) {
510
for (j = 0; j < f->context_count[i]; j++)
511
for (k = 0; k < CONTEXT_SIZE; k++) {
512
int pred = j ? f->initial_states[i][j - 1][k] : 128;
513
f->initial_states[i][j][k] =
514
(pred + get_symbol(c, state2[k], 1)) & 0xFF;
518
if (f->version > 2) {
519
f->ec = get_symbol(c, state, 0);
522
if (f->version > 2) {
524
v = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0,
525
f->avctx->extradata, f->avctx->extradata_size);
527
av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", v);
528
return AVERROR_INVALIDDATA;
536
static int read_header(FFV1Context *f)
538
uint8_t state[CONTEXT_SIZE];
539
int i, j, context_count = -1;
540
RangeCoder *const c = &f->slice_context[0]->c;
542
memset(state, 128, sizeof(state));
544
if (f->version < 2) {
545
unsigned v = get_symbol(c, state, 0);
547
av_log(f->avctx, AV_LOG_ERROR,
548
"invalid version %d in version 1 header\n", v);
549
return AVERROR_INVALIDDATA;
553
f->ac = f->avctx->coder_type = get_symbol(c, state, 0);
556
for (i = 1; i < 256; i++)
557
f->state_transition[i] =
558
get_symbol(c, state, 1) + c->one_state[i];
561
f->colorspace = get_symbol(c, state, 0); //YUV cs type
564
f->avctx->bits_per_raw_sample = get_symbol(c, state, 0);
566
f->chroma_planes = get_rac(c, state);
567
f->chroma_h_shift = get_symbol(c, state, 0);
568
f->chroma_v_shift = get_symbol(c, state, 0);
569
f->transparency = get_rac(c, state);
570
f->plane_count = 2 + f->transparency;
573
if (f->colorspace == 0) {
574
if (!f->transparency && !f->chroma_planes) {
575
if (f->avctx->bits_per_raw_sample <= 8)
576
f->avctx->pix_fmt = AV_PIX_FMT_GRAY8;
578
f->avctx->pix_fmt = AV_PIX_FMT_GRAY16;
579
} else if (f->avctx->bits_per_raw_sample <= 8 && !f->transparency) {
580
switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
582
f->avctx->pix_fmt = AV_PIX_FMT_YUV444P;
585
f->avctx->pix_fmt = AV_PIX_FMT_YUV440P;
588
f->avctx->pix_fmt = AV_PIX_FMT_YUV422P;
591
f->avctx->pix_fmt = AV_PIX_FMT_YUV420P;
594
f->avctx->pix_fmt = AV_PIX_FMT_YUV411P;
597
f->avctx->pix_fmt = AV_PIX_FMT_YUV410P;
600
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
601
return AVERROR(ENOSYS);
603
} else if (f->avctx->bits_per_raw_sample <= 8 && f->transparency) {
604
switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
606
f->avctx->pix_fmt = AV_PIX_FMT_YUVA444P;
609
f->avctx->pix_fmt = AV_PIX_FMT_YUVA422P;
612
f->avctx->pix_fmt = AV_PIX_FMT_YUVA420P;
615
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
616
return AVERROR(ENOSYS);
618
} else if (f->avctx->bits_per_raw_sample == 9) {
619
f->packed_at_lsb = 1;
620
switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
622
f->avctx->pix_fmt = AV_PIX_FMT_YUV444P9;
625
f->avctx->pix_fmt = AV_PIX_FMT_YUV422P9;
628
f->avctx->pix_fmt = AV_PIX_FMT_YUV420P9;
631
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
632
return AVERROR(ENOSYS);
634
} else if (f->avctx->bits_per_raw_sample == 10) {
635
f->packed_at_lsb = 1;
636
switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
638
f->avctx->pix_fmt = AV_PIX_FMT_YUV444P10;
641
f->avctx->pix_fmt = AV_PIX_FMT_YUV422P10;
644
f->avctx->pix_fmt = AV_PIX_FMT_YUV420P10;
647
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
648
return AVERROR(ENOSYS);
651
switch (16 * f->chroma_h_shift + f->chroma_v_shift) {
653
f->avctx->pix_fmt = AV_PIX_FMT_YUV444P16;
656
f->avctx->pix_fmt = AV_PIX_FMT_YUV422P16;
659
f->avctx->pix_fmt = AV_PIX_FMT_YUV420P16;
662
av_log(f->avctx, AV_LOG_ERROR, "format not supported\n");
663
return AVERROR(ENOSYS);
666
} else if (f->colorspace == 1) {
667
if (f->chroma_h_shift || f->chroma_v_shift) {
668
av_log(f->avctx, AV_LOG_ERROR,
669
"chroma subsampling not supported in this colorspace\n");
670
return AVERROR(ENOSYS);
672
switch (f->avctx->bits_per_raw_sample) {
674
f->avctx->pix_fmt = AV_PIX_FMT_RGB32;
677
f->avctx->pix_fmt = AV_PIX_FMT_GBRP9;
680
f->avctx->pix_fmt = AV_PIX_FMT_GBRP10;
683
av_log(f->avctx, AV_LOG_ERROR,
684
"bit depth %d not supported\n",
685
f->avctx->bits_per_raw_sample);
686
return AVERROR(ENOSYS);
689
av_log(f->avctx, AV_LOG_ERROR, "colorspace not supported\n");
690
return AVERROR(ENOSYS);
693
av_dlog(f->avctx, "%d %d %d\n",
694
f->chroma_h_shift, f->chroma_v_shift, f->avctx->pix_fmt);
695
if (f->version < 2) {
696
context_count = read_quant_tables(c, f->quant_table);
697
if (context_count < 0) {
698
av_log(f->avctx, AV_LOG_ERROR, "read_quant_table error\n");
699
return AVERROR_INVALIDDATA;
701
} else if (f->version < 3) {
702
f->slice_count = get_symbol(c, state, 0);
704
const uint8_t *p = c->bytestream_end;
705
for (f->slice_count = 0;
706
f->slice_count < MAX_SLICES && 3 < p - c->bytestream_start;
708
int trailer = 3 + 5 * !!f->ec;
709
int size = AV_RB24(p - trailer);
710
if (size + trailer > p - c->bytestream_start)
715
if (f->slice_count > (unsigned)MAX_SLICES || f->slice_count <= 0) {
716
av_log(f->avctx, AV_LOG_ERROR, "slice count %d is invalid\n",
718
return AVERROR_INVALIDDATA;
721
for (j = 0; j < f->slice_count; j++) {
722
FFV1Context *fs = f->slice_context[j];
724
fs->packed_at_lsb = f->packed_at_lsb;
726
fs->slice_damaged = 0;
728
if (f->version == 2) {
729
fs->slice_x = get_symbol(c, state, 0) * f->width;
730
fs->slice_y = get_symbol(c, state, 0) * f->height;
732
(get_symbol(c, state, 0) + 1) * f->width + fs->slice_x;
734
(get_symbol(c, state, 0) + 1) * f->height + fs->slice_y;
736
fs->slice_x /= f->num_h_slices;
737
fs->slice_y /= f->num_v_slices;
738
fs->slice_width = fs->slice_width / f->num_h_slices - fs->slice_x;
739
fs->slice_height = fs->slice_height / f->num_v_slices - fs->slice_y;
740
if ((unsigned)fs->slice_width > f->width ||
741
(unsigned)fs->slice_height > f->height)
742
return AVERROR_INVALIDDATA;
743
if ((unsigned)fs->slice_x + (uint64_t)fs->slice_width > f->width
744
|| (unsigned)fs->slice_y + (uint64_t)fs->slice_height >
746
return AVERROR_INVALIDDATA;
749
for (i = 0; i < f->plane_count; i++) {
750
PlaneContext *const p = &fs->plane[i];
752
if (f->version == 2) {
753
int idx = get_symbol(c, state, 0);
754
if (idx > (unsigned)f->quant_table_count) {
755
av_log(f->avctx, AV_LOG_ERROR,
756
"quant_table_index out of range\n");
757
return AVERROR_INVALIDDATA;
759
p->quant_table_index = idx;
760
memcpy(p->quant_table, f->quant_tables[idx],
761
sizeof(p->quant_table));
762
context_count = f->context_count[idx];
764
memcpy(p->quant_table, f->quant_table, sizeof(p->quant_table));
767
if (f->version <= 2) {
768
av_assert0(context_count >= 0);
769
if (p->context_count < context_count) {
771
av_freep(&p->vlc_state);
773
p->context_count = context_count;
780
static av_cold int ffv1_decode_init(AVCodecContext *avctx)
782
FFV1Context *f = avctx->priv_data;
785
ffv1_common_init(avctx);
787
if (avctx->extradata && (ret = read_extra_header(f)) < 0)
790
if ((ret = ffv1_init_slice_contexts(f)) < 0)
796
static int ffv1_decode_frame(AVCodecContext *avctx, void *data,
797
int *got_frame, AVPacket *avpkt)
799
const uint8_t *buf = avpkt->data;
800
int buf_size = avpkt->size;
801
FFV1Context *f = avctx->priv_data;
802
RangeCoder *const c = &f->slice_context[0]->c;
803
AVFrame *const p = &f->picture;
805
uint8_t keystate = 128;
806
const uint8_t *buf_p;
808
AVFrame *picture = data;
810
/* release previously stored data */
812
avctx->release_buffer(avctx, p);
814
ff_init_range_decoder(c, buf, buf_size);
815
ff_build_rac_states(c, 0.05 * (1LL << 32), 256 - 8);
817
p->pict_type = AV_PICTURE_TYPE_I; //FIXME I vs. P
818
if (get_rac(c, &keystate)) {
821
if ((ret = read_header(f)) < 0)
825
if (!f->key_frame_ok) {
826
av_log(avctx, AV_LOG_ERROR,
827
"Cannot decode non-keyframe without valid keyframe\n");
828
return AVERROR_INVALIDDATA;
833
p->reference = 3; //for error concealment
834
if ((ret = ff_get_buffer(avctx, p)) < 0) {
835
av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
839
if (avctx->debug & FF_DEBUG_PICT_INFO)
840
av_log(avctx, AV_LOG_DEBUG,
841
"ver:%d keyframe:%d coder:%d ec:%d slices:%d bps:%d\n",
842
f->version, p->key_frame, f->ac, f->ec, f->slice_count,
843
f->avctx->bits_per_raw_sample);
845
buf_p = buf + buf_size;
846
for (i = f->slice_count - 1; i >= 0; i--) {
847
FFV1Context *fs = f->slice_context[i];
848
int trailer = 3 + 5 * !!f->ec;
851
if (i || f->version > 2)
852
v = AV_RB24(buf_p - trailer) + trailer;
854
v = buf_p - c->bytestream_start;
855
if (buf_p - c->bytestream_start < v) {
856
av_log(avctx, AV_LOG_ERROR, "Slice pointer chain broken\n");
857
return AVERROR_INVALIDDATA;
862
unsigned crc = av_crc(av_crc_get_table(AV_CRC_32_IEEE), 0, buf_p, v);
864
av_log(f->avctx, AV_LOG_ERROR, "CRC mismatch %X!\n", crc);
865
fs->slice_damaged = 1;
870
ff_init_range_decoder(&fs->c, buf_p, v);
872
fs->c.bytestream_end = (uint8_t *)(buf_p + v);
875
avctx->execute(avctx, decode_slice, &f->slice_context[0], NULL,
879
for (i = f->slice_count - 1; i >= 0; i--) {
880
FFV1Context *fs = f->slice_context[i];
882
if (fs->slice_damaged && f->last_picture.data[0]) {
883
const uint8_t *src[4];
885
for (j = 0; j < 4; j++) {
886
int sh = (j == 1 || j == 2) ? f->chroma_h_shift : 0;
887
int sv = (j == 1 || j == 2) ? f->chroma_v_shift : 0;
888
dst[j] = f->picture.data[j] + f->picture.linesize[j] *
889
(fs->slice_y >> sv) + (fs->slice_x >> sh);
890
src[j] = f->last_picture.data[j] +
891
f->last_picture.linesize[j] *
892
(fs->slice_y >> sv) + (fs->slice_x >> sh);
894
av_image_copy(dst, f->picture.linesize, (const uint8_t **)src,
895
f->last_picture.linesize,
896
avctx->pix_fmt, fs->slice_width,
906
FFSWAP(AVFrame, f->picture, f->last_picture);
911
AVCodec ff_ffv1_decoder = {
913
.type = AVMEDIA_TYPE_VIDEO,
914
.id = AV_CODEC_ID_FFV1,
915
.priv_data_size = sizeof(FFV1Context),
916
.init = ffv1_decode_init,
918
.decode = ffv1_decode_frame,
919
.capabilities = CODEC_CAP_DR1 /*| CODEC_CAP_DRAW_HORIZ_BAND*/ |
920
CODEC_CAP_SLICE_THREADS,
921
.long_name = NULL_IF_CONFIG_SMALL("FFmpeg video codec #1"),