FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/smc.c	Lines:	173	221	78.3 %
Date:	2021-04-14 23:45:22	Branches:	101	150	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 "decode.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 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;

    s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);

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