summaryrefslogtreecommitdiff
path: root/src/libffmpeg/libavcodec/rtjpeg.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/libffmpeg/libavcodec/rtjpeg.c')
-rw-r--r--src/libffmpeg/libavcodec/rtjpeg.c165
1 files changed, 0 insertions, 165 deletions
diff --git a/src/libffmpeg/libavcodec/rtjpeg.c b/src/libffmpeg/libavcodec/rtjpeg.c
deleted file mode 100644
index dbc6cfd88..000000000
--- a/src/libffmpeg/libavcodec/rtjpeg.c
+++ /dev/null
@@ -1,165 +0,0 @@
-/*
- * RTJpeg decoding functions
- * Copyright (c) 2006 Reimar Doeffinger
- *
- * This file is part of FFmpeg.
- *
- * FFmpeg is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 of the License, or (at your option) any later version.
- *
- * FFmpeg is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with FFmpeg; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- */
-#include "common.h"
-#include "bitstream.h"
-#include "dsputil.h"
-#include "rtjpeg.h"
-
-#define PUT_COEFF(c) \
- i = scan[coeff--]; \
- block[i] = (c) * quant[i];
-
-//! aligns the bitstream to the give power of two
-#define ALIGN(a) \
- n = (-get_bits_count(gb)) & (a - 1); \
- if (n) {skip_bits(gb, n);}
-
-/**
- * \brief read one block from stream
- * \param gb contains stream data
- * \param block where data is written to
- * \param scan array containing the mapping stream address -> block position
- * \param quant quantization factors
- *
- * Note: GetBitContext is used to make the code simpler, since all data is
- * aligned this could be done faster in a different way, e.g. as it is done
- * in MPlayer libmpcodecs/native/RTjpegN.c
- */
-static inline int get_block(GetBitContext *gb, DCTELEM *block, uint8_t *scan,
- uint32_t *quant) {
- int coeff, i, n;
- int8_t ac;
- uint8_t dc = get_bits(gb, 8);
-
- // block not coded
- if (dc == 255)
- return 0;
-
- // number of non-zero coefficients
- coeff = get_bits(gb, 6);
- // normally we would only need to clear the (63 - coeff) last values,
- // but since we do not know where they are we just clear the whole block
- memset(block, 0, 64 * sizeof(DCTELEM));
-
- // 2 bits per coefficient
- while (coeff) {
- ac = get_sbits(gb, 2);
- if (ac == -2)
- break; // continue with more bits
- PUT_COEFF(ac);
- }
-
- // 4 bits per coefficient
- ALIGN(4);
- while (coeff) {
- ac = get_sbits(gb, 4);
- if (ac == -8)
- break; // continue with more bits
- PUT_COEFF(ac);
- }
-
- // 8 bits per coefficient
- ALIGN(8);
- while (coeff) {
- ac = get_sbits(gb, 8);
- PUT_COEFF(ac);
- }
-
- PUT_COEFF(dc);
- return 1;
-}
-
-/**
- * \brief decode one rtjpeg YUV420 frame
- * \param c context, must be initialized via rtjpeg_decode_init
- * \param f AVFrame to place decoded frame into. If parts of the frame
- * are not coded they are left unchanged, so consider initializing it
- * \param buf buffer containing input data
- * \param buf_size length of input data in bytes
- * \return number of bytes consumed from the input buffer
- */
-int rtjpeg_decode_frame_yuv420(RTJpegContext *c, AVFrame *f,
- uint8_t *buf, int buf_size) {
- DECLARE_ALIGNED_16(DCTELEM, block[64]);
- GetBitContext gb;
- int w = c->w / 16, h = c->h / 16;
- int x, y;
- uint8_t *y1 = f->data[0], *y2 = f->data[0] + 8 * f->linesize[0];
- uint8_t *u = f->data[1], *v = f->data[2];
- init_get_bits(&gb, buf, buf_size * 8);
- for (y = 0; y < h; y++) {
- for (x = 0; x < w; x++) {
- if (get_block(&gb, block, c->scan, c->lquant))
- c->dsp->idct_put(y1, f->linesize[0], block);
- y1 += 8;
- if (get_block(&gb, block, c->scan, c->lquant))
- c->dsp->idct_put(y1, f->linesize[0], block);
- y1 += 8;
- if (get_block(&gb, block, c->scan, c->lquant))
- c->dsp->idct_put(y2, f->linesize[0], block);
- y2 += 8;
- if (get_block(&gb, block, c->scan, c->lquant))
- c->dsp->idct_put(y2, f->linesize[0], block);
- y2 += 8;
- if (get_block(&gb, block, c->scan, c->cquant))
- c->dsp->idct_put(u, f->linesize[1], block);
- u += 8;
- if (get_block(&gb, block, c->scan, c->cquant))
- c->dsp->idct_put(v, f->linesize[2], block);
- v += 8;
- }
- y1 += 2 * 8 * (f->linesize[0] - w);
- y2 += 2 * 8 * (f->linesize[0] - w);
- u += 8 * (f->linesize[1] - w);
- v += 8 * (f->linesize[2] - w);
- }
- return get_bits_count(&gb) / 8;
-}
-
-/**
- * \brief initialize an RTJpegContext, may be called multiple times
- * \param c context to initialize
- * \param dsp specifies the idct to use for decoding
- * \param width width of image, will be rounded down to the nearest multiple
- * of 16 for decoding
- * \param height height of image, will be rounded down to the nearest multiple
- * of 16 for decoding
- * \param lquant luma quantization table to use
- * \param cquant chroma quantization table to use
- */
-void rtjpeg_decode_init(RTJpegContext *c, DSPContext *dsp,
- int width, int height,
- uint32_t *lquant, uint32_t *cquant) {
- int i;
- c->dsp = dsp;
- for (i = 0; i < 64; i++) {
- int z = ff_zigzag_direct[i];
- int p = c->dsp->idct_permutation[i];
- z = ((z << 3) | (z >> 3)) & 63; // rtjpeg uses a transposed variant
-
- // permute the scan and quantization tables for the chosen idct
- c->scan[i] = c->dsp->idct_permutation[z];
- c->lquant[p] = lquant[i];
- c->cquant[p] = cquant[i];
- }
- c->w = width;
- c->h = height;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2025-04-25 15:59:00 +0000