FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/smc.c	Lines:	177	226	78.3 %
Date:	2021-01-22 05:18:52	Branches:	105	156	67.3 %


/*
 * Quicktime Graphics (SMC) Video Decoder
 * Copyright (C) 2003 The FFmpeg project
 *
 * 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
 */

/**
 * @file
 * QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
 * For more information about the SMC format, visit:
 *   http://www.pcisys.net/~melanson/codecs/
 *
 * The SMC decoder outputs PAL8 colorspace data.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "libavutil/intreadwrite.h"
#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"

#define CPAIR 2
#define CQUAD 4
#define COCTET 8

#define COLORS_PER_TABLE 256

typedef struct SmcContext {

    AVCodecContext *avctx;
    AVFrame *frame;

    GetByteContext gb;

    /* SMC color tables */
    unsigned char color_pairs[COLORS_PER_TABLE * CPAIR];
    unsigned char color_quads[COLORS_PER_TABLE * CQUAD];
    unsigned char color_octets[COLORS_PER_TABLE * COCTET];

    uint32_t pal[256];
} SmcContext;

#define GET_BLOCK_COUNT() \
  (opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F);

#define ADVANCE_BLOCK() \
{ \
    pixel_ptr += 4; \
    if (pixel_ptr >= width) \
    { \
        pixel_ptr = 0; \
        row_ptr += stride * 4; \
    } \
    total_blocks--; \
    if (total_blocks < !!n_blocks) \
    { \
        av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \
        return; \
    } \
}

static void smc_decode_stream(SmcContext *s)
{
    int width = s->avctx->width;
    int height = s->avctx->height;
    int stride = s->frame->linesize[0];
    int i;
    int chunk_size;
    int buf_size = bytestream2_size(&s->gb);
    unsigned char opcode;
    int n_blocks;
    unsigned int color_flags;
    unsigned int color_flags_a;
    unsigned int color_flags_b;
    unsigned int flag_mask;

    unsigned char * const pixels = s->frame->data[0];

    int image_size = height * s->frame->linesize[0];
    int row_ptr = 0;
    int pixel_ptr = 0;
    int pixel_x, pixel_y;
    int row_inc = stride - 4;
    int block_ptr;
    int prev_block_ptr;
    int prev_block_ptr1, prev_block_ptr2;
    int prev_block_flag;
    int total_blocks;
    int color_table_index;  /* indexes to color pair, quad, or octet tables */
    int pixel;

    int color_pair_index = 0;
    int color_quad_index = 0;
    int color_octet_index = 0;

    /* make the palette available */
    memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);

    bytestream2_skip(&s->gb, 1);
    chunk_size = bytestream2_get_be24(&s->gb);
    if (chunk_size != buf_size)
        av_log(s->avctx, AV_LOG_INFO, "warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
            chunk_size, buf_size);

    chunk_size = buf_size;
    total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);

    /* traverse through the blocks */
    while (total_blocks) {
        /* sanity checks */
        /* make sure the row pointer hasn't gone wild */
        if (row_ptr >= image_size) {
            av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
                row_ptr, image_size);
            return;
        }
        if (bytestream2_get_bytes_left(&s->gb) < 1) {
            av_log(s->avctx, AV_LOG_ERROR, "input too small\n");
            return;
        }

        opcode = bytestream2_get_byte(&s->gb);
        switch (opcode & 0xF0) {
        /* skip n blocks */
        case 0x00:
        case 0x10:
            n_blocks = GET_BLOCK_COUNT();
            while (n_blocks--) {
                ADVANCE_BLOCK();
            }
            break;

        /* repeat last block n times */
        case 0x20:
        case 0x30:
            n_blocks = GET_BLOCK_COUNT();

            /* sanity check */
            if ((row_ptr == 0) && (pixel_ptr == 0)) {
                av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
                    opcode & 0xF0);
                return;
            }

            /* figure out where the previous block started */
            if (pixel_ptr == 0)
                prev_block_ptr1 =
                    (row_ptr - s->avctx->width * 4) + s->avctx->width - 4;
            else
                prev_block_ptr1 = row_ptr + pixel_ptr - 4;

            while (n_blocks--) {
                block_ptr = row_ptr + pixel_ptr;
                prev_block_ptr = prev_block_ptr1;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixels[block_ptr++] = pixels[prev_block_ptr++];
                    }
                    block_ptr += row_inc;
                    prev_block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* repeat previous pair of blocks n times */
        case 0x40:
        case 0x50:
            n_blocks = GET_BLOCK_COUNT();
            n_blocks *= 2;

            /* sanity check */
            if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
                av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
                    opcode & 0xF0);
                return;
            }

            /* figure out where the previous 2 blocks started */
            if (pixel_ptr == 0)
                prev_block_ptr1 = (row_ptr - s->avctx->width * 4) +
                    s->avctx->width - 4 * 2;
            else if (pixel_ptr == 4)
                prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc;
            else
                prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2;

            if (pixel_ptr == 0)
                prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc;
            else
                prev_block_ptr2 = row_ptr + pixel_ptr - 4;

            prev_block_flag = 0;
            while (n_blocks--) {
                block_ptr = row_ptr + pixel_ptr;
                if (prev_block_flag)
                    prev_block_ptr = prev_block_ptr2;
                else
                    prev_block_ptr = prev_block_ptr1;
                prev_block_flag = !prev_block_flag;

                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixels[block_ptr++] = pixels[prev_block_ptr++];
                    }
                    block_ptr += row_inc;
                    prev_block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* 1-color block encoding */
        case 0x60:
        case 0x70:
            n_blocks = GET_BLOCK_COUNT();
            pixel = bytestream2_get_byte(&s->gb);

            while (n_blocks--) {
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixels[block_ptr++] = pixel;
                    }
                    block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* 2-color block encoding */
        case 0x80:
        case 0x90:
            n_blocks = (opcode & 0x0F) + 1;

            /* figure out which color pair to use to paint the 2-color block */
            if ((opcode & 0xF0) == 0x80) {
                /* fetch the next 2 colors from bytestream and store in next
                 * available entry in the color pair table */
                for (i = 0; i < CPAIR; i++) {
                    pixel = bytestream2_get_byte(&s->gb);
                    color_table_index = CPAIR * color_pair_index + i;
                    s->color_pairs[color_table_index] = pixel;
                }
                /* this is the base index to use for this block */
                color_table_index = CPAIR * color_pair_index;
                color_pair_index++;
                /* wraparound */
                if (color_pair_index == COLORS_PER_TABLE)
                    color_pair_index = 0;
            } else
                color_table_index = CPAIR * bytestream2_get_byte(&s->gb);

            while (n_blocks--) {
                color_flags = bytestream2_get_be16(&s->gb);
                flag_mask = 0x8000;
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        if (color_flags & flag_mask)
                            pixel = color_table_index + 1;
                        else
                            pixel = color_table_index;
                        flag_mask >>= 1;
                        pixels[block_ptr++] = s->color_pairs[pixel];
                    }
                    block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* 4-color block encoding */
        case 0xA0:
        case 0xB0:
            n_blocks = (opcode & 0x0F) + 1;

            /* figure out which color quad to use to paint the 4-color block */
            if ((opcode & 0xF0) == 0xA0) {
                /* fetch the next 4 colors from bytestream and store in next
                 * available entry in the color quad table */
                for (i = 0; i < CQUAD; i++) {
                    pixel = bytestream2_get_byte(&s->gb);
                    color_table_index = CQUAD * color_quad_index + i;
                    s->color_quads[color_table_index] = pixel;
                }
                /* this is the base index to use for this block */
                color_table_index = CQUAD * color_quad_index;
                color_quad_index++;
                /* wraparound */
                if (color_quad_index == COLORS_PER_TABLE)
                    color_quad_index = 0;
            } else
                color_table_index = CQUAD * bytestream2_get_byte(&s->gb);

            while (n_blocks--) {
                color_flags = bytestream2_get_be32(&s->gb);
                /* flag mask actually acts as a bit shift count here */
                flag_mask = 30;
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixel = color_table_index +
                            ((color_flags >> flag_mask) & 0x03);
                        flag_mask -= 2;
                        pixels[block_ptr++] = s->color_quads[pixel];
                    }
                    block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* 8-color block encoding */
        case 0xC0:
        case 0xD0:
            n_blocks = (opcode & 0x0F) + 1;

            /* figure out which color octet to use to paint the 8-color block */
            if ((opcode & 0xF0) == 0xC0) {
                /* fetch the next 8 colors from bytestream and store in next
                 * available entry in the color octet table */
                for (i = 0; i < COCTET; i++) {
                    pixel = bytestream2_get_byte(&s->gb);
                    color_table_index = COCTET * color_octet_index + i;
                    s->color_octets[color_table_index] = pixel;
                }
                /* this is the base index to use for this block */
                color_table_index = COCTET * color_octet_index;
                color_octet_index++;
                /* wraparound */
                if (color_octet_index == COLORS_PER_TABLE)
                    color_octet_index = 0;
            } else
                color_table_index = COCTET * bytestream2_get_byte(&s->gb);

            while (n_blocks--) {
                /*
                  For this input of 6 hex bytes:
                    01 23 45 67 89 AB
                  Mangle it to this output:
                    flags_a = xx012456, flags_b = xx89A37B
                */
                /* build the color flags */
                int val1 = bytestream2_get_be16(&s->gb);
                int val2 = bytestream2_get_be16(&s->gb);
                int val3 = bytestream2_get_be16(&s->gb);
                color_flags_a = ((val1 & 0xFFF0) << 8) | (val2 >> 4);
                color_flags_b = ((val3 & 0xFFF0) << 8) |
                    ((val1 & 0x0F) << 8) | ((val2 & 0x0F) << 4) | (val3 & 0x0F);

                color_flags = color_flags_a;
                /* flag mask actually acts as a bit shift count here */
                flag_mask = 21;
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    /* reload flags at third row (iteration pixel_y == 2) */
                    if (pixel_y == 2) {
                        color_flags = color_flags_b;
                        flag_mask = 21;
                    }
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixel = color_table_index +
                            ((color_flags >> flag_mask) & 0x07);
                        flag_mask -= 3;
                        pixels[block_ptr++] = s->color_octets[pixel];
                    }
                    block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        /* 16-color block encoding (every pixel is a different color) */
        case 0xE0:
            n_blocks = (opcode & 0x0F) + 1;

            while (n_blocks--) {
                block_ptr = row_ptr + pixel_ptr;
                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++) {
                        pixels[block_ptr++] = bytestream2_get_byte(&s->gb);
                    }
                    block_ptr += row_inc;
                }
                ADVANCE_BLOCK();
            }
            break;

        case 0xF0:
            avpriv_request_sample(s->avctx, "0xF0 opcode");
            break;
        }
    }

    return;
}

static av_cold int smc_decode_init(AVCodecContext *avctx)
{
    SmcContext *s = avctx->priv_data;

    s->avctx = avctx;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

    s->frame = av_frame_alloc();
    if (!s->frame)
        return AVERROR(ENOMEM);

    return 0;
}

static int smc_decode_frame(AVCodecContext *avctx,
                             void *data, int *got_frame,
                             AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    SmcContext *s = avctx->priv_data;
    int pal_size;
    const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
    int ret;
    int total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);

    if (total_blocks / 1024 > avpkt->size)
        return AVERROR_INVALIDDATA;

    bytestream2_init(&s->gb, buf, buf_size);

    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
        return ret;

    if (pal && pal_size == AVPALETTE_SIZE) {
        s->frame->palette_has_changed = 1;
        memcpy(s->pal, pal, AVPALETTE_SIZE);
    } else if (pal) {
        av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
    }

    smc_decode_stream(s);

    *got_frame      = 1;
    if ((ret = av_frame_ref(data, s->frame)) < 0)
        return ret;

    /* always report that the buffer was completely consumed */
    return buf_size;
}

static av_cold int smc_decode_end(AVCodecContext *avctx)
{
    SmcContext *s = avctx->priv_data;

    av_frame_free(&s->frame);

    return 0;
}

AVCodec ff_smc_decoder = {
    .name           = "smc",
    .long_name      = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_SMC,
    .priv_data_size = sizeof(SmcContext),
    .init           = smc_decode_init,
    .close          = smc_decode_end,
    .decode         = smc_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Quicktime Graphics (SMC) Video Decoder
3			* Copyright (C) 2003 The FFmpeg project
4			*
5			* This file is part of FFmpeg.
6			*
7			* FFmpeg is free software; you can redistribute it and/or
8			* modify it under the terms of the GNU Lesser General Public
9			* License as published by the Free Software Foundation; either
10			* version 2.1 of the License, or (at your option) any later version.
11			*
12			* FFmpeg is distributed in the hope that it will be useful,
13			* but WITHOUT ANY WARRANTY; without even the implied warranty of
14			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15			* Lesser General Public License for more details.
16			*
17			* You should have received a copy of the GNU Lesser General Public
18			* License along with FFmpeg; if not, write to the Free Software
19			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20			*/
21
22			/**
23			* @file
24			* QT SMC Video Decoder by Mike Melanson (melanson@pcisys.net)
25			* For more information about the SMC format, visit:
26			* http://www.pcisys.net/~melanson/codecs/
27			*
28			* The SMC decoder outputs PAL8 colorspace data.
29			*/
30
31			#include <stdio.h>
32			#include <stdlib.h>
33			#include <string.h>
34
35			#include "libavutil/intreadwrite.h"
36			#include "avcodec.h"
37			#include "bytestream.h"
38			#include "internal.h"
39
40			#define CPAIR 2
41			#define CQUAD 4
42			#define COCTET 8
43
44			#define COLORS_PER_TABLE 256
45
46			typedef struct SmcContext {
47
48			AVCodecContext *avctx;
49			AVFrame *frame;
50
51			GetByteContext gb;
52
53			/* SMC color tables */
54			unsigned char color_pairs[COLORS_PER_TABLE * CPAIR];
55			unsigned char color_quads[COLORS_PER_TABLE * CQUAD];
56			unsigned char color_octets[COLORS_PER_TABLE * COCTET];
57
58			uint32_t pal[256];
59			} SmcContext;
60
61			#define GET_BLOCK_COUNT() \
62			(opcode & 0x10) ? (1 + bytestream2_get_byte(&s->gb)) : 1 + (opcode & 0x0F);
63
64			#define ADVANCE_BLOCK() \
65			{ \
66			pixel_ptr += 4; \
67			if (pixel_ptr >= width) \
68			{ \
69			pixel_ptr = 0; \
70			row_ptr += stride * 4; \
71			} \
72			total_blocks--; \
73			if (total_blocks < !!n_blocks) \
74			{ \
75			av_log(s->avctx, AV_LOG_INFO, "warning: block counter just went negative (this should not happen)\n"); \
76			return; \
77			} \
78			}
79
80		120	static void smc_decode_stream(SmcContext *s)
81			{
82		120	int width = s->avctx->width;
83		120	int height = s->avctx->height;
84		120	int stride = s->frame->linesize[0];
85			int i;
86			int chunk_size;
87		120	int buf_size = bytestream2_size(&s->gb);
88			unsigned char opcode;
89			int n_blocks;
90			unsigned int color_flags;
91			unsigned int color_flags_a;
92			unsigned int color_flags_b;
93			unsigned int flag_mask;
94
95		120	unsigned char * const pixels = s->frame->data[0];
96
97		120	int image_size = height * s->frame->linesize[0];
98		120	int row_ptr = 0;
99		120	int pixel_ptr = 0;
100			int pixel_x, pixel_y;
101		120	int row_inc = stride - 4;
102			int block_ptr;
103			int prev_block_ptr;
104			int prev_block_ptr1, prev_block_ptr2;
105			int prev_block_flag;
106			int total_blocks;
107			int color_table_index; /* indexes to color pair, quad, or octet tables */
108			int pixel;
109
110		120	int color_pair_index = 0;
111		120	int color_quad_index = 0;
112		120	int color_octet_index = 0;
113
114			/* make the palette available */
115		120	memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
116
117		120	bytestream2_skip(&s->gb, 1);
118		120	chunk_size = bytestream2_get_be24(&s->gb);
119	✗✓	120	if (chunk_size != buf_size)
120			av_log(s->avctx, AV_LOG_INFO, "warning: MOV chunk size != encoded chunk size (%d != %d); using MOV chunk size\n",
121			chunk_size, buf_size);
122
123		120	chunk_size = buf_size;
124		120	total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
125
126			/* traverse through the blocks */
127		120	while (total_blocks) {
128			/* sanity checks */
129			/* make sure the row pointer hasn't gone wild */
130	✗✓	130697	if (row_ptr >= image_size) {
131			av_log(s->avctx, AV_LOG_INFO, "SMC decoder just went out of bounds (row ptr = %d, height = %d)\n",
132			row_ptr, image_size);
133			return;
134			}
135	✗✓	130697	if (bytestream2_get_bytes_left(&s->gb) < 1) {
136			av_log(s->avctx, AV_LOG_ERROR, "input too small\n");
137			return;
138			}
139
140		130697	opcode = bytestream2_get_byte(&s->gb);
141	✓✓✗✓ ✓✓✓✓ ✗✗	130697	switch (opcode & 0xF0) {
142			/* skip n blocks */
143		28630	case 0x00:
144			case 0x10:
145	✓✓	28630	n_blocks = GET_BLOCK_COUNT();
146	✓✓	447015	while (n_blocks--) {
147	✓✓✗✓	418385	ADVANCE_BLOCK();
148			}
149		28630	break;
150
151			/* repeat last block n times */
152		1068	case 0x20:
153			case 0x30:
154	✓✓	1068	n_blocks = GET_BLOCK_COUNT();
155
156			/* sanity check */
157	✗✓✗✗	1068	if ((row_ptr == 0) && (pixel_ptr == 0)) {
158			av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but no blocks rendered yet\n",
159			opcode & 0xF0);
160			return;
161			}
162
163			/* figure out where the previous block started */
164	✗✓	1068	if (pixel_ptr == 0)
165			prev_block_ptr1 =
166			(row_ptr - s->avctx->width * 4) + s->avctx->width - 4;
167			else
168		1068	prev_block_ptr1 = row_ptr + pixel_ptr - 4;
169
170	✓✓	3393	while (n_blocks--) {
171		2325	block_ptr = row_ptr + pixel_ptr;
172		2325	prev_block_ptr = prev_block_ptr1;
173	✓✓	11625	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
174	✓✓	46500	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
175		37200	pixels[block_ptr++] = pixels[prev_block_ptr++];
176			}
177		9300	block_ptr += row_inc;
178		9300	prev_block_ptr += row_inc;
179			}
180	✓✓✗✓	2325	ADVANCE_BLOCK();
181			}
182		1068	break;
183
184			/* repeat previous pair of blocks n times */
185			case 0x40:
186			case 0x50:
187			n_blocks = GET_BLOCK_COUNT();
188			n_blocks *= 2;
189
190			/* sanity check */
191			if ((row_ptr == 0) && (pixel_ptr < 2 * 4)) {
192			av_log(s->avctx, AV_LOG_INFO, "encountered repeat block opcode (%02X) but not enough blocks rendered yet\n",
193			opcode & 0xF0);
194			return;
195			}
196
197			/* figure out where the previous 2 blocks started */
198			if (pixel_ptr == 0)
199			prev_block_ptr1 = (row_ptr - s->avctx->width * 4) +
200			s->avctx->width - 4 * 2;
201			else if (pixel_ptr == 4)
202			prev_block_ptr1 = (row_ptr - s->avctx->width * 4) + row_inc;
203			else
204			prev_block_ptr1 = row_ptr + pixel_ptr - 4 * 2;
205
206			if (pixel_ptr == 0)
207			prev_block_ptr2 = (row_ptr - s->avctx->width * 4) + row_inc;
208			else
209			prev_block_ptr2 = row_ptr + pixel_ptr - 4;
210
211			prev_block_flag = 0;
212			while (n_blocks--) {
213			block_ptr = row_ptr + pixel_ptr;
214			if (prev_block_flag)
215			prev_block_ptr = prev_block_ptr2;
216			else
217			prev_block_ptr = prev_block_ptr1;
218			prev_block_flag = !prev_block_flag;
219
220			for (pixel_y = 0; pixel_y < 4; pixel_y++) {
221			for (pixel_x = 0; pixel_x < 4; pixel_x++) {
222			pixels[block_ptr++] = pixels[prev_block_ptr++];
223			}
224			block_ptr += row_inc;
225			prev_block_ptr += row_inc;
226			}
227			ADVANCE_BLOCK();
228			}
229			break;
230
231			/* 1-color block encoding */
232		11688	case 0x60:
233			case 0x70:
234	✓✓	11688	n_blocks = GET_BLOCK_COUNT();
235		11688	pixel = bytestream2_get_byte(&s->gb);
236
237	✓✓	62105	while (n_blocks--) {
238		50417	block_ptr = row_ptr + pixel_ptr;
239	✓✓	252085	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
240	✓✓	1008340	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
241		806672	pixels[block_ptr++] = pixel;
242			}
243		201668	block_ptr += row_inc;
244			}
245	✓✓✗✓	50417	ADVANCE_BLOCK();
246			}
247		11688	break;
248
249			/* 2-color block encoding */
250		17912	case 0x80:
251			case 0x90:
252		17912	n_blocks = (opcode & 0x0F) + 1;
253
254			/* figure out which color pair to use to paint the 2-color block */
255	✓✓	17912	if ((opcode & 0xF0) == 0x80) {
256			/* fetch the next 2 colors from bytestream and store in next
257			* available entry in the color pair table */
258	✓✓	15813	for (i = 0; i < CPAIR; i++) {
259		10542	pixel = bytestream2_get_byte(&s->gb);
260		10542	color_table_index = CPAIR * color_pair_index + i;
261		10542	s->color_pairs[color_table_index] = pixel;
262			}
263			/* this is the base index to use for this block */
264		5271	color_table_index = CPAIR * color_pair_index;
265		5271	color_pair_index++;
266			/* wraparound */
267	✗✓	5271	if (color_pair_index == COLORS_PER_TABLE)
268			color_pair_index = 0;
269			} else
270		12641	color_table_index = CPAIR * bytestream2_get_byte(&s->gb);
271
272	✓✓	36856	while (n_blocks--) {
273		18944	color_flags = bytestream2_get_be16(&s->gb);
274		18944	flag_mask = 0x8000;
275		18944	block_ptr = row_ptr + pixel_ptr;
276	✓✓	94720	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
277	✓✓	378880	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
278	✓✓	303104	if (color_flags & flag_mask)
279		121822	pixel = color_table_index + 1;
280			else
281		181282	pixel = color_table_index;
282		303104	flag_mask >>= 1;
283		303104	pixels[block_ptr++] = s->color_pairs[pixel];
284			}
285		75776	block_ptr += row_inc;
286			}
287	✓✓✗✓	18944	ADVANCE_BLOCK();
288			}
289		17912	break;
290
291			/* 4-color block encoding */
292		35882	case 0xA0:
293			case 0xB0:
294		35882	n_blocks = (opcode & 0x0F) + 1;
295
296			/* figure out which color quad to use to paint the 4-color block */
297	✓✓	35882	if ((opcode & 0xF0) == 0xA0) {
298			/* fetch the next 4 colors from bytestream and store in next
299			* available entry in the color quad table */
300	✓✓	72670	for (i = 0; i < CQUAD; i++) {
301		58136	pixel = bytestream2_get_byte(&s->gb);
302		58136	color_table_index = CQUAD * color_quad_index + i;
303		58136	s->color_quads[color_table_index] = pixel;
304			}
305			/* this is the base index to use for this block */
306		14534	color_table_index = CQUAD * color_quad_index;
307		14534	color_quad_index++;
308			/* wraparound */
309	✗✓	14534	if (color_quad_index == COLORS_PER_TABLE)
310			color_quad_index = 0;
311			} else
312		21348	color_table_index = CQUAD * bytestream2_get_byte(&s->gb);
313
314	✓✓	77041	while (n_blocks--) {
315		41159	color_flags = bytestream2_get_be32(&s->gb);
316			/* flag mask actually acts as a bit shift count here */
317		41159	flag_mask = 30;
318		41159	block_ptr = row_ptr + pixel_ptr;
319	✓✓	205795	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
320	✓✓	823180	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
321		658544	pixel = color_table_index +
322		658544	((color_flags >> flag_mask) & 0x03);
323		658544	flag_mask -= 2;
324		658544	pixels[block_ptr++] = s->color_quads[pixel];
325			}
326		164636	block_ptr += row_inc;
327			}
328	✓✓✗✓	41159	ADVANCE_BLOCK();
329			}
330		35882	break;
331
332			/* 8-color block encoding */
333		33474	case 0xC0:
334			case 0xD0:
335		33474	n_blocks = (opcode & 0x0F) + 1;
336
337			/* figure out which color octet to use to paint the 8-color block */
338	✓✓	33474	if ((opcode & 0xF0) == 0xC0) {
339			/* fetch the next 8 colors from bytestream and store in next
340			* available entry in the color octet table */
341	✓✓	98883	for (i = 0; i < COCTET; i++) {
342		87896	pixel = bytestream2_get_byte(&s->gb);
343		87896	color_table_index = COCTET * color_octet_index + i;
344		87896	s->color_octets[color_table_index] = pixel;
345			}
346			/* this is the base index to use for this block */
347		10987	color_table_index = COCTET * color_octet_index;
348		10987	color_octet_index++;
349			/* wraparound */
350	✗✓	10987	if (color_octet_index == COLORS_PER_TABLE)
351			color_octet_index = 0;
352			} else
353		22487	color_table_index = COCTET * bytestream2_get_byte(&s->gb);
354
355	✓✓	76047	while (n_blocks--) {
356			/*
357			For this input of 6 hex bytes:
358			01 23 45 67 89 AB
359			Mangle it to this output:
360			flags_a = xx012456, flags_b = xx89A37B
361			*/
362			/* build the color flags */
363		42573	int val1 = bytestream2_get_be16(&s->gb);
364		42573	int val2 = bytestream2_get_be16(&s->gb);
365		42573	int val3 = bytestream2_get_be16(&s->gb);
366		42573	color_flags_a = ((val1 & 0xFFF0) << 8) \| (val2 >> 4);
367		42573	color_flags_b = ((val3 & 0xFFF0) << 8) \|
368		42573	((val1 & 0x0F) << 8) \| ((val2 & 0x0F) << 4) \| (val3 & 0x0F);
369
370		42573	color_flags = color_flags_a;
371			/* flag mask actually acts as a bit shift count here */
372		42573	flag_mask = 21;
373		42573	block_ptr = row_ptr + pixel_ptr;
374	✓✓	212865	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
375			/* reload flags at third row (iteration pixel_y == 2) */
376	✓✓	170292	if (pixel_y == 2) {
377		42573	color_flags = color_flags_b;
378		42573	flag_mask = 21;
379			}
380	✓✓	851460	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
381		681168	pixel = color_table_index +
382		681168	((color_flags >> flag_mask) & 0x07);
383		681168	flag_mask -= 3;
384		681168	pixels[block_ptr++] = s->color_octets[pixel];
385			}
386		170292	block_ptr += row_inc;
387			}
388	✓✓✗✓	42573	ADVANCE_BLOCK();
389			}
390		33474	break;
391
392			/* 16-color block encoding (every pixel is a different color) */
393		2043	case 0xE0:
394		2043	n_blocks = (opcode & 0x0F) + 1;
395
396	✓✓	4240	while (n_blocks--) {
397		2197	block_ptr = row_ptr + pixel_ptr;
398	✓✓	10985	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
399	✓✓	43940	for (pixel_x = 0; pixel_x < 4; pixel_x++) {
400		35152	pixels[block_ptr++] = bytestream2_get_byte(&s->gb);
401			}
402		8788	block_ptr += row_inc;
403			}
404	✗✓✗✓	2197	ADVANCE_BLOCK();
405			}
406		2043	break;
407
408			case 0xF0:
409			avpriv_request_sample(s->avctx, "0xF0 opcode");
410			break;
411			}
412	✓✓	130817	}
413
414		120	return;
415			}
416
417		2	static av_cold int smc_decode_init(AVCodecContext *avctx)
418			{
419		2	SmcContext *s = avctx->priv_data;
420
421		2	s->avctx = avctx;
422		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
423
424		2	s->frame = av_frame_alloc();
425	✗✓	2	if (!s->frame)
426			return AVERROR(ENOMEM);
427
428		2	return 0;
429			}
430
431		120	static int smc_decode_frame(AVCodecContext *avctx,
432			void data, int got_frame,
433			AVPacket *avpkt)
434			{
435		120	const uint8_t *buf = avpkt->data;
436		120	int buf_size = avpkt->size;
437		120	SmcContext *s = avctx->priv_data;
438			int pal_size;
439		120	const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
440			int ret;
441		120	int total_blocks = ((s->avctx->width + 3) / 4) * ((s->avctx->height + 3) / 4);
442
443	✗✓	120	if (total_blocks / 1024 > avpkt->size)
444			return AVERROR_INVALIDDATA;
445
446		120	bytestream2_init(&s->gb, buf, buf_size);
447
448	✗✓	120	if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
449			return ret;
450
451	✓✓✓✗	120	if (pal && pal_size == AVPALETTE_SIZE) {
452		1	s->frame->palette_has_changed = 1;
453		1	memcpy(s->pal, pal, AVPALETTE_SIZE);
454	✗✓	119	} else if (pal) {
455			av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
456			}
457
458		120	smc_decode_stream(s);
459
460		120	*got_frame = 1;
461	✗✓	120	if ((ret = av_frame_ref(data, s->frame)) < 0)
462			return ret;
463
464			/* always report that the buffer was completely consumed */
465		120	return buf_size;
466			}
467
468		2	static av_cold int smc_decode_end(AVCodecContext *avctx)
469			{
470		2	SmcContext *s = avctx->priv_data;
471
472		2	av_frame_free(&s->frame);
473
474		2	return 0;
475			}
476
477			AVCodec ff_smc_decoder = {
478			.name = "smc",
479			.long_name = NULL_IF_CONFIG_SMALL("QuickTime Graphics (SMC)"),
480			.type = AVMEDIA_TYPE_VIDEO,
481			.id = AV_CODEC_ID_SMC,
482			.priv_data_size = sizeof(SmcContext),
483			.init = smc_decode_init,
484			.close = smc_decode_end,
485			.decode = smc_decode_frame,
486			.capabilities = AV_CODEC_CAP_DR1,
487			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
488			};