GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/rpza.c Lines: 93 121 76.9 %
Date: 2020-09-25 23:16:12 Branches: 39 68 57.4 %

Line Branch Exec Source
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/*
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 * Quicktime Video (RPZA) Video Decoder
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 * Copyright (C) 2003 The FFmpeg project
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 FFmpeg; 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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 * QT RPZA Video Decoder by Roberto Togni
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 * For more information about the RPZA format, visit:
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 *   http://www.pcisys.net/~melanson/codecs/
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 *
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 * The RPZA decoder outputs RGB555 colorspace data.
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 *
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 * Note that this decoder reads big endian RGB555 pixel values from the
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 * bytestream, arranges them in the host's endian order, and outputs
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 * them to the final rendered map in the same host endian order. This is
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 * intended behavior as the libavcodec documentation states that RGB555
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 * pixels shall be stored in native CPU endianness.
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 */
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "libavutil/internal.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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typedef struct RpzaContext {
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    AVCodecContext *avctx;
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    AVFrame *frame;
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    GetByteContext gb;
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} RpzaContext;
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#define CHECK_BLOCK()                                                         \
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    if (total_blocks < 1) {                                                    \
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        av_log(s->avctx, AV_LOG_ERROR,                                         \
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               "Block counter just went negative (this should not happen)\n"); \
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        return AVERROR_INVALIDDATA;                                            \
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    }                                                                          \
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#define ADVANCE_BLOCK()             \
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    {                               \
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        pixel_ptr += 4;             \
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        if (pixel_ptr >= width)     \
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        {                           \
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            pixel_ptr = 0;          \
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            row_ptr  += stride * 4; \
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        }                           \
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        total_blocks--;             \
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    }
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static int rpza_decode_stream(RpzaContext *s)
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{
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    int width = s->avctx->width;
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    int stride, row_inc, ret;
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    int chunk_size;
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31
    uint16_t colorA = 0, colorB;
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    uint16_t color4[4];
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    uint16_t ta, tb;
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    uint16_t *pixels;
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31
    int row_ptr = 0;
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31
    int pixel_ptr = 0;
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    int block_ptr;
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    int pixel_x, pixel_y;
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    int total_blocks;
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    /* First byte is always 0xe1. Warn if it's different */
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    if (bytestream2_peek_byte(&s->gb) != 0xe1)
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        av_log(s->avctx, AV_LOG_ERROR, "First chunk byte is 0x%02x instead of 0xe1\n",
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               bytestream2_peek_byte(&s->gb));
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    /* Get chunk size, ignoring first byte */
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31
    chunk_size = bytestream2_get_be32(&s->gb) & 0x00FFFFFF;
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    /* If length mismatch use size from MOV file and try to decode anyway */
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    if (chunk_size != bytestream2_get_bytes_left(&s->gb) + 4)
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        av_log(s->avctx, AV_LOG_WARNING,
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               "MOV chunk size %d != encoded chunk size %d\n",
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               chunk_size,
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               bytestream2_get_bytes_left(&s->gb) + 4
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              );
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    /* Number of 4x4 blocks in frame. */
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    total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
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    if (total_blocks / 32 > bytestream2_get_bytes_left(&s->gb))
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        return AVERROR_INVALIDDATA;
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    if ((ret = ff_reget_buffer(s->avctx, s->frame, 0)) < 0)
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        return ret;
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    pixels = (uint16_t *)s->frame->data[0];
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    stride = s->frame->linesize[0] / 2;
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    row_inc = stride - 4;
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    /* Process chunk data */
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60204
    while (bytestream2_get_bytes_left(&s->gb)) {
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60173
        uint8_t opcode = bytestream2_get_byte(&s->gb); /* Get opcode */
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60173
        int n_blocks = (opcode & 0x1f) + 1; /* Extract block counter from opcode */
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        /* If opcode MSbit is 0, we need more data to decide what to do */
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60173
        if ((opcode & 0x80) == 0) {
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48161
            colorA = (opcode << 8) | bytestream2_get_byte(&s->gb);
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48161
            opcode = 0;
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48161
            if ((bytestream2_peek_byte(&s->gb) & 0x80) != 0) {
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                /* Must behave as opcode 110xxxxx, using colorA computed
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                 * above. Use fake opcode 0x20 to enter switch block at
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                 * the right place */
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48161
                opcode = 0x20;
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48161
                n_blocks = 1;
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            }
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        }
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60173
        n_blocks = FFMIN(n_blocks, total_blocks);
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60173
        switch (opcode & 0xe0) {
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        /* Skip blocks */
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10393
        case 0x80:
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108698
            while (n_blocks--) {
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98305
                CHECK_BLOCK();
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98305
                ADVANCE_BLOCK();
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            }
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10393
            break;
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        /* Fill blocks with one color */
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1619
        case 0xa0:
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            colorA = bytestream2_get_be16(&s->gb);
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            while (n_blocks--) {
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2334
                CHECK_BLOCK();
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2334
                block_ptr = row_ptr + pixel_ptr;
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11670
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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46680
                    for (pixel_x = 0; pixel_x < 4; pixel_x++){
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37344
                        pixels[block_ptr] = colorA;
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37344
                        block_ptr++;
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                    }
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9336
                    block_ptr += row_inc;
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                }
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2334
                ADVANCE_BLOCK();
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            }
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1619
            break;
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        /* Fill blocks with 4 colors */
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        case 0xc0:
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            colorA = bytestream2_get_be16(&s->gb);
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48161
        case 0x20:
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48161
            colorB = bytestream2_get_be16(&s->gb);
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            /* sort out the colors */
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48161
            color4[0] = colorB;
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48161
            color4[1] = 0;
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48161
            color4[2] = 0;
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48161
            color4[3] = colorA;
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            /* red components */
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48161
            ta = (colorA >> 10) & 0x1F;
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48161
            tb = (colorB >> 10) & 0x1F;
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48161
            color4[1] |= ((11 * ta + 21 * tb) >> 5) << 10;
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48161
            color4[2] |= ((21 * ta + 11 * tb) >> 5) << 10;
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            /* green components */
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48161
            ta = (colorA >> 5) & 0x1F;
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48161
            tb = (colorB >> 5) & 0x1F;
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48161
            color4[1] |= ((11 * ta + 21 * tb) >> 5) << 5;
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48161
            color4[2] |= ((21 * ta + 11 * tb) >> 5) << 5;
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            /* blue components */
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48161
            ta = colorA & 0x1F;
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48161
            tb = colorB & 0x1F;
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48161
            color4[1] |= ((11 * ta + 21 * tb) >> 5);
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48161
            color4[2] |= ((21 * ta + 11 * tb) >> 5);
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48161
            if (bytestream2_get_bytes_left(&s->gb) < n_blocks * 4)
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                return AVERROR_INVALIDDATA;
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96322
            while (n_blocks--) {
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48161
                CHECK_BLOCK();
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48161
                block_ptr = row_ptr + pixel_ptr;
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240805
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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192644
                    uint8_t index = bytestream2_get_byteu(&s->gb);
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963220
                    for (pixel_x = 0; pixel_x < 4; pixel_x++){
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770576
                        uint8_t idx = (index >> (2 * (3 - pixel_x))) & 0x03;
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770576
                        pixels[block_ptr] = color4[idx];
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770576
                        block_ptr++;
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                    }
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192644
                    block_ptr += row_inc;
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                }
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48161
                ADVANCE_BLOCK();
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            }
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48161
            break;
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        /* Fill block with 16 colors */
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        case 0x00:
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            if (bytestream2_get_bytes_left(&s->gb) < 30)
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                return AVERROR_INVALIDDATA;
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            CHECK_BLOCK();
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            block_ptr = row_ptr + pixel_ptr;
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            for (pixel_y = 0; pixel_y < 4; pixel_y++) {
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                for (pixel_x = 0; pixel_x < 4; pixel_x++){
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                    /* We already have color of upper left pixel */
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                    if ((pixel_y != 0) || (pixel_x != 0))
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                        colorA = bytestream2_get_be16u(&s->gb);
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                    pixels[block_ptr] = colorA;
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                    block_ptr++;
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                }
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                block_ptr += row_inc;
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            }
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            ADVANCE_BLOCK();
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            break;
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        /* Unknown opcode */
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        default:
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            av_log(s->avctx, AV_LOG_ERROR, "Unknown opcode %d in rpza chunk."
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                 " Skip remaining %d bytes of chunk data.\n", opcode,
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                 bytestream2_get_bytes_left(&s->gb));
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            return AVERROR_INVALIDDATA;
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        } /* Opcode switch */
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    }
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    return 0;
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}
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static av_cold int rpza_decode_init(AVCodecContext *avctx)
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{
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2
    RpzaContext *s = avctx->priv_data;
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    s->avctx = avctx;
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2
    avctx->pix_fmt = AV_PIX_FMT_RGB555;
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    s->frame = av_frame_alloc();
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2
    if (!s->frame)
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        return AVERROR(ENOMEM);
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    return 0;
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}
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static int rpza_decode_frame(AVCodecContext *avctx,
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                             void *data, int *got_frame,
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                             AVPacket *avpkt)
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{
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    RpzaContext *s = avctx->priv_data;
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    int ret;
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    bytestream2_init(&s->gb, avpkt->data, avpkt->size);
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    ret = rpza_decode_stream(s);
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    if (ret < 0)
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        return ret;
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    if ((ret = av_frame_ref(data, s->frame)) < 0)
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        return ret;
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    *got_frame      = 1;
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    /* always report that the buffer was completely consumed */
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    return avpkt->size;
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}
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static av_cold int rpza_decode_end(AVCodecContext *avctx)
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{
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2
    RpzaContext *s = avctx->priv_data;
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2
    av_frame_free(&s->frame);
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2
    return 0;
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}
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AVCodec ff_rpza_decoder = {
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    .name           = "rpza",
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    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime video (RPZA)"),
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    .type           = AVMEDIA_TYPE_VIDEO,
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    .id             = AV_CODEC_ID_RPZA,
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    .priv_data_size = sizeof(RpzaContext),
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    .init           = rpza_decode_init,
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    .close          = rpza_decode_end,
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    .decode         = rpza_decode_frame,
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    .capabilities   = AV_CODEC_CAP_DR1,
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};