mirror of https://github.com/FFmpeg/FFmpeg.git
Kostya Shishkov
13 years ago
committed by
Anton Khirnov
parent
df3ca34a56
commit
0d8506b8c5
8 changed files with 471 additions and 2 deletions
@ -0,0 +1,460 @@ |
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/*
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* Ut Video decoder |
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* Copyright (c) 2011 Konstantin Shishkov |
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* |
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* This file is part of Libav. |
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* |
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* Libav is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* Libav is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with Libav; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file |
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* Ut Video decoder |
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*/ |
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#include <stdlib.h> |
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#include "libavutil/intreadwrite.h" |
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#include "avcodec.h" |
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#include "bytestream.h" |
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#include "get_bits.h" |
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#include "dsputil.h" |
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enum { |
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PRED_NONE = 0, |
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PRED_LEFT, |
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PRED_GRADIENT, |
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PRED_MEDIAN, |
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}; |
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typedef struct UtvideoContext { |
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AVCodecContext *avctx; |
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AVFrame pic; |
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DSPContext dsp; |
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uint32_t frame_info_size, flags, frame_info; |
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int planes; |
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int slices; |
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int compression; |
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int interlaced; |
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int frame_pred; |
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uint8_t *slice_bits; |
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int slice_bits_size; |
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} UtvideoContext; |
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typedef struct HuffEntry { |
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uint8_t sym; |
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uint8_t len; |
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} HuffEntry; |
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static int huff_cmp(const void *a, const void *b) |
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{ |
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const HuffEntry *aa = a, *bb = b; |
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return (aa->len - bb->len)*256 + aa->sym - bb->sym; |
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} |
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static int build_huff(const uint8_t *src, VLC *vlc) |
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{ |
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int i; |
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HuffEntry he[256]; |
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int last; |
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uint32_t codes[256]; |
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uint8_t bits[256]; |
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uint8_t syms[256]; |
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uint32_t code; |
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for (i = 0; i < 256; i++) { |
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he[i].sym = i; |
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he[i].len = *src++; |
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} |
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qsort(he, 256, sizeof(*he), huff_cmp); |
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if (!he[0].len || he[0].len > 32) |
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return -1; |
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last = 255; |
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while (he[last].len == 255 && last) |
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last--; |
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code = 1; |
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for (i = last; i >= 0; i--) { |
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codes[i] = code >> (32 - he[i].len); |
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bits[i] = he[i].len; |
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syms[i] = he[i].sym; |
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code += 0x80000000u >> (he[i].len - 1); |
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} |
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return init_vlc_sparse(vlc, FFMIN(he[last].len, 9), last + 1, |
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bits, sizeof(*bits), sizeof(*bits), |
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codes, sizeof(*codes), sizeof(*codes), |
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syms, sizeof(*syms), sizeof(*syms), 0); |
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} |
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static int decode_plane(UtvideoContext *c, int plane_no, |
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uint8_t *dst, int step, int stride, |
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int width, int height, |
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const uint8_t *src, int src_size, int use_pred) |
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{ |
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int i, j, slice, pix; |
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int sstart, send; |
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VLC vlc; |
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GetBitContext gb; |
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int prev; |
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if (build_huff(src, &vlc)) { |
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av_log(c->avctx, AV_LOG_ERROR, "Cannot build Huffman codes\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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src += 256; |
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src_size -= 256; |
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send = 0; |
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for (slice = 0; slice < c->slices; slice++) { |
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uint8_t *dest; |
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int slice_data_start, slice_data_end, slice_size; |
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sstart = send; |
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send = height * (slice + 1) / c->slices; |
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dest = dst + sstart * stride; |
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// slice offset and size validation was done earlier
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slice_data_start = slice ? AV_RL32(src + slice * 4 - 4) : 0; |
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slice_data_end = AV_RL32(src + slice * 4); |
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slice_size = slice_data_end - slice_data_start; |
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if (!slice_size) { |
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for (j = sstart; j < send; j++) { |
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for (i = 0; i < width * step; i += step) |
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dest[i] = 0x80; |
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dest += stride; |
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} |
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continue; |
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} |
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memcpy(c->slice_bits, src + slice_data_start + c->slices * 4, slice_size); |
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memset(c->slice_bits + slice_size, 0, FF_INPUT_BUFFER_PADDING_SIZE); |
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c->dsp.bswap_buf((uint32_t*)c->slice_bits, (uint32_t*)c->slice_bits, |
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(slice_data_end - slice_data_start + 3) >> 2); |
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init_get_bits(&gb, c->slice_bits, slice_size * 8); |
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prev = 0x80; |
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for (j = sstart; j < send; j++) { |
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for (i = 0; i < width * step; i += step) { |
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if (get_bits_left(&gb) <= 0) { |
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av_log(c->avctx, AV_LOG_ERROR, "Slice decoding ran out of bits\n"); |
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goto fail; |
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} |
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pix = get_vlc2(&gb, vlc.table, vlc.bits, 4); |
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if (pix < 0) { |
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av_log(c->avctx, AV_LOG_ERROR, "Decoding error\n"); |
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goto fail; |
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} |
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if (use_pred) { |
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prev += pix; |
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pix = prev; |
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} |
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dest[i] = pix; |
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} |
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dest += stride; |
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} |
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if (get_bits_left(&gb) > 32) |
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av_log(c->avctx, AV_LOG_WARNING, "%d bits left after decoding slice\n", |
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get_bits_left(&gb)); |
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} |
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free_vlc(&vlc); |
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return 0; |
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fail: |
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free_vlc(&vlc); |
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return AVERROR_INVALIDDATA; |
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} |
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static const int rgb_order[4] = { 1, 2, 0, 3 }; |
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static void restore_rgb_planes(uint8_t *src, int step, int stride, int width, int height) |
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{ |
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int i, j; |
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uint8_t r, g, b; |
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for (j = 0; j < height; j++) { |
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for (i = 0; i < width * step; i += step) { |
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r = src[i]; |
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g = src[i + 1]; |
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b = src[i + 2]; |
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src[i] = r + g - 0x80; |
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src[i + 2] = b + g - 0x80; |
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} |
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src += stride; |
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} |
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} |
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static void restore_median(uint8_t *src, int step, int stride, |
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int width, int height, int slices) |
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{ |
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int i, j, slice; |
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int A, B, C; |
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uint8_t *bsrc; |
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int slice_start, slice_height; |
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for (slice = 0; slice < slices; slice++) { |
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slice_start = (slice * height) / slices; |
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slice_height = ((slice + 1) * height) / slices - slice_start; |
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bsrc = src + slice_start * stride; |
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// first line - left neighbour prediction
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bsrc[0] += 0x80; |
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A = bsrc[0]; |
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for (i = step; i < width * step; i += step) { |
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bsrc[i] += A; |
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A = bsrc[i]; |
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} |
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bsrc += stride; |
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if (slice_height == 1) |
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continue; |
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// second line - first element has top predition, the rest uses median
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C = bsrc[-stride]; |
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bsrc[0] += C; |
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A = bsrc[0]; |
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for (i = step; i < width * step; i += step) { |
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B = bsrc[i - stride]; |
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
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C = B; |
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A = bsrc[i]; |
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} |
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bsrc += stride; |
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// the rest of lines use continuous median prediction
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for (j = 2; j < slice_height; j++) { |
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for (i = 0; i < width * step; i += step) { |
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B = bsrc[i - stride]; |
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bsrc[i] += mid_pred(A, B, (uint8_t)(A + B - C)); |
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C = B; |
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A = bsrc[i]; |
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} |
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bsrc += stride; |
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} |
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} |
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} |
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt) |
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{ |
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const uint8_t *buf = avpkt->data; |
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int buf_size = avpkt->size; |
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const uint8_t *buf_end = buf + buf_size; |
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UtvideoContext *c = avctx->priv_data; |
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const uint8_t *ptr; |
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int i, j; |
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const uint8_t *plane_start[5]; |
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int plane_size, max_slice_size = 0, slice_start, slice_end, slice_size; |
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int ret; |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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c->pic.reference = 1; |
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c->pic.buffer_hints = FF_BUFFER_HINTS_VALID; |
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if ((ret = avctx->get_buffer(avctx, &c->pic)) < 0) { |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return ret; |
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} |
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/* parse plane structure to retrieve frame flags and validate slice offsets */ |
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ptr = buf; |
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for (i = 0; i < c->planes; i++) { |
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plane_start[i] = ptr; |
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if (buf_end - ptr < 256 + 4 * c->slices) { |
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av_log(avctx, AV_LOG_ERROR, "Insufficient data for a plane\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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ptr += 256; |
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slice_start = 0; |
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slice_end = 0; |
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for (j = 0; j < c->slices; j++) { |
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slice_end = bytestream_get_le32(&ptr); |
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slice_size = slice_end - slice_start; |
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if (slice_size < 0) { |
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av_log(avctx, AV_LOG_ERROR, "Incorrect slice size\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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slice_start = slice_end; |
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max_slice_size = FFMAX(max_slice_size, slice_size); |
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} |
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plane_size = slice_end; |
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if (buf_end - ptr < plane_size) { |
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av_log(avctx, AV_LOG_ERROR, "Plane size is bigger than available data\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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ptr += plane_size; |
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} |
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plane_start[c->planes] = ptr; |
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if (buf_end - ptr < c->frame_info_size) { |
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av_log(avctx, AV_LOG_ERROR, "Not enough data for frame information\n"); |
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return AVERROR_INVALIDDATA; |
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} |
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c->frame_info = AV_RL32(ptr); |
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av_log(avctx, AV_LOG_DEBUG, "frame information flags %X\n", c->frame_info); |
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c->frame_pred = (c->frame_info >> 8) & 3; |
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if (c->frame_pred == PRED_GRADIENT) { |
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av_log_ask_for_sample(avctx, "Frame uses gradient prediction\n"); |
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return AVERROR_PATCHWELCOME; |
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} |
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av_fast_malloc(&c->slice_bits, &c->slice_bits_size, |
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max_slice_size + FF_INPUT_BUFFER_PADDING_SIZE); |
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if (!c->slice_bits) { |
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av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n"); |
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return AVERROR(ENOMEM); |
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} |
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switch (c->avctx->pix_fmt) { |
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case PIX_FMT_RGB24: |
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case PIX_FMT_RGBA: |
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for (i = 0; i < c->planes; i++) { |
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ret = decode_plane(c, i, c->pic.data[0] + rgb_order[i], c->planes, |
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c->pic.linesize[0], avctx->width, avctx->height, |
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plane_start[i], plane_start[i + 1] - plane_start[i], |
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c->frame_pred == PRED_LEFT); |
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if (ret) |
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return ret; |
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if (c->frame_pred == PRED_MEDIAN) |
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restore_median(c->pic.data[0] + rgb_order[i], c->planes, |
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c->pic.linesize[0], avctx->width, avctx->height, |
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c->slices); |
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} |
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restore_rgb_planes(c->pic.data[0], c->planes, c->pic.linesize[0], |
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avctx->width, avctx->height); |
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break; |
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case PIX_FMT_YUV420P: |
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for (i = 0; i < 3; i++) { |
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ret = decode_plane(c, i, c->pic.data[i], 1, |
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c->pic.linesize[i], avctx->width >> !!i, avctx->height >> !!i, |
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plane_start[i], plane_start[i + 1] - plane_start[i], |
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c->frame_pred == PRED_LEFT); |
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if (ret) |
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return ret; |
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if (c->frame_pred == PRED_MEDIAN) |
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restore_median(c->pic.data[i], 1, c->pic.linesize[i], |
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avctx->width >> !!i, avctx->height >> !!i, |
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c->slices); |
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} |
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break; |
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case PIX_FMT_YUV422P: |
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for (i = 0; i < 3; i++) { |
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ret = decode_plane(c, i, c->pic.data[i], 1, |
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c->pic.linesize[i], avctx->width >> !!i, avctx->height, |
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plane_start[i], plane_start[i + 1] - plane_start[i], |
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c->frame_pred == PRED_LEFT); |
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if (ret) |
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return ret; |
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if (c->frame_pred == PRED_MEDIAN) |
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restore_median(c->pic.data[i], 1, c->pic.linesize[i], |
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avctx->width >> !!i, avctx->height, c->slices); |
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} |
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break; |
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} |
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*data_size = sizeof(AVFrame); |
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*(AVFrame*)data = c->pic; |
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/* always report that the buffer was completely consumed */ |
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return buf_size; |
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} |
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static av_cold int decode_init(AVCodecContext *avctx) |
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{ |
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UtvideoContext * const c = avctx->priv_data; |
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c->avctx = avctx; |
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dsputil_init(&c->dsp, avctx); |
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if (avctx->extradata_size < 16) { |
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av_log(avctx, AV_LOG_ERROR, "Insufficient extradata size %d, should be at least 16\n", |
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avctx->extradata_size); |
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return AVERROR_INVALIDDATA; |
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} |
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av_log(avctx, AV_LOG_DEBUG, "Encoder version %d.%d.%d.%d\n", |
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avctx->extradata[3], avctx->extradata[2], |
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avctx->extradata[1], avctx->extradata[0]); |
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av_log(avctx, AV_LOG_DEBUG, "Original format %X\n", AV_RB32(avctx->extradata + 4)); |
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c->frame_info_size = AV_RL32(avctx->extradata + 8); |
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c->flags = AV_RL32(avctx->extradata + 12); |
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if (c->frame_info_size != 4) |
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av_log_ask_for_sample(avctx, "Frame info is not 4 bytes\n"); |
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av_log(avctx, AV_LOG_DEBUG, "Encoding parameters %08X\n", c->flags); |
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c->slices = (c->flags >> 24) + 1; |
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c->compression = c->flags & 1; |
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c->interlaced = c->flags & 0x800; |
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c->slice_bits_size = 0; |
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switch (avctx->codec_tag) { |
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case MKTAG('U', 'L', 'R', 'G'): |
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c->planes = 3; |
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avctx->pix_fmt = PIX_FMT_RGB24; |
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break; |
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case MKTAG('U', 'L', 'R', 'A'): |
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c->planes = 4; |
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avctx->pix_fmt = PIX_FMT_RGBA; |
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break; |
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case MKTAG('U', 'L', 'Y', '0'): |
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c->planes = 3; |
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avctx->pix_fmt = PIX_FMT_YUV420P; |
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break; |
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case MKTAG('U', 'L', 'Y', '2'): |
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c->planes = 3; |
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avctx->pix_fmt = PIX_FMT_YUV422P; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Unknown Ut Video FOURCC provided (%08X)\n", |
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avctx->codec_tag); |
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return AVERROR_INVALIDDATA; |
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} |
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return 0; |
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} |
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static av_cold int decode_end(AVCodecContext *avctx) |
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{ |
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UtvideoContext * const c = avctx->priv_data; |
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if (c->pic.data[0]) |
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avctx->release_buffer(avctx, &c->pic); |
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av_freep(&c->slice_bits); |
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return 0; |
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} |
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AVCodec ff_utvideo_decoder = { |
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.name = "utvideo", |
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.type = AVMEDIA_TYPE_VIDEO, |
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.id = CODEC_ID_UTVIDEO, |
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.priv_data_size = sizeof(UtvideoContext), |
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.init = decode_init, |
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.close = decode_end, |
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.decode = decode_frame, |
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.capabilities = CODEC_CAP_DR1, |
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.long_name = NULL_IF_CONFIG_SMALL("Ut Video"), |
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}; |
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