FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/msvideo1.c	Lines:	155	164	94.5 %
Date:	2021-01-21 21:11:50	Branches:	78	100	78.0 %


/*
 * Microsoft Video-1 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
 * Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net)
 * For more information about the MS Video-1 format, visit:
 *   http://www.pcisys.net/~melanson/codecs/
 */

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

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

#define PALETTE_COUNT 256
#define CHECK_STREAM_PTR(n) \
  if ((stream_ptr + n) > s->size ) { \
    av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \
      stream_ptr + n, s->size); \
    return; \
  }

typedef struct Msvideo1Context {

    AVCodecContext *avctx;
    AVFrame *frame;

    const unsigned char *buf;
    int size;

    int mode_8bit;  /* if it's not 8-bit, it's 16-bit */

    uint32_t pal[256];
} Msvideo1Context;

static av_cold int msvideo1_decode_init(AVCodecContext *avctx)
{
    Msvideo1Context *s = avctx->priv_data;

    s->avctx = avctx;

    if (avctx->width < 4 || avctx->height < 4)
        return AVERROR_INVALIDDATA;

    /* figure out the colorspace based on the presence of a palette */
    if (s->avctx->bits_per_coded_sample == 8) {
        s->mode_8bit = 1;
        avctx->pix_fmt = AV_PIX_FMT_PAL8;
        if (avctx->extradata_size >= AVPALETTE_SIZE)
            memcpy(s->pal, avctx->extradata, AVPALETTE_SIZE);
    } else {
        s->mode_8bit = 0;
        avctx->pix_fmt = AV_PIX_FMT_RGB555;
    }

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

    return 0;
}

static void msvideo1_decode_8bit(Msvideo1Context *s)
{
    int block_ptr, pixel_ptr;
    int total_blocks;
    int pixel_x, pixel_y;  /* pixel width and height iterators */
    int block_x, block_y;  /* block width and height iterators */
    int blocks_wide, blocks_high;  /* width and height in 4x4 blocks */
    int block_inc;
    int row_dec;

    /* decoding parameters */
    int stream_ptr;
    unsigned char byte_a, byte_b;
    unsigned short flags;
    int skip_blocks;
    unsigned char colors[8];
    unsigned char *pixels = s->frame->data[0];
    int stride = s->frame->linesize[0];

    stream_ptr = 0;
    skip_blocks = 0;
    blocks_wide = s->avctx->width / 4;
    blocks_high = s->avctx->height / 4;
    total_blocks = blocks_wide * blocks_high;
    block_inc = 4;
    row_dec = stride + 4;

    for (block_y = blocks_high; block_y > 0; block_y--) {
        block_ptr = ((block_y * 4) - 1) * stride;
        for (block_x = blocks_wide; block_x > 0; block_x--) {
            /* check if this block should be skipped */
            if (skip_blocks) {
                block_ptr += block_inc;
                skip_blocks--;
                total_blocks--;
                continue;
            }

            pixel_ptr = block_ptr;

            /* get the next two bytes in the encoded data stream */
            CHECK_STREAM_PTR(2);
            byte_a = s->buf[stream_ptr++];
            byte_b = s->buf[stream_ptr++];

            /* check if the decode is finished */
            if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
                return;
            else if ((byte_b & 0xFC) == 0x84) {
                /* skip code, but don't count the current block */
                skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
            } else if (byte_b < 0x80) {
                /* 2-color encoding */
                flags = (byte_b << 8) | byte_a;

                CHECK_STREAM_PTR(2);
                colors[0] = s->buf[stream_ptr++];
                colors[1] = s->buf[stream_ptr++];

                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
                        pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
                    pixel_ptr -= row_dec;
                }
            } else if (byte_b >= 0x90) {
                /* 8-color encoding */
                flags = (byte_b << 8) | byte_a;

                CHECK_STREAM_PTR(8);
                memcpy(colors, &s->buf[stream_ptr], 8);
                stream_ptr += 8;

                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
                        pixels[pixel_ptr++] =
                            colors[((pixel_y & 0x2) << 1) +
                                (pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
                    pixel_ptr -= row_dec;
                }
            } else {
                /* 1-color encoding */
                colors[0] = byte_a;

                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++)
                        pixels[pixel_ptr++] = colors[0];
                    pixel_ptr -= row_dec;
                }
            }

            block_ptr += block_inc;
            total_blocks--;
        }
    }

    /* make the palette available on the way out */
    if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
        memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
}

static void msvideo1_decode_16bit(Msvideo1Context *s)
{
    int block_ptr, pixel_ptr;
    int total_blocks;
    int pixel_x, pixel_y;  /* pixel width and height iterators */
    int block_x, block_y;  /* block width and height iterators */
    int blocks_wide, blocks_high;  /* width and height in 4x4 blocks */
    int block_inc;
    int row_dec;

    /* decoding parameters */
    int stream_ptr;
    unsigned char byte_a, byte_b;
    unsigned short flags;
    int skip_blocks;
    unsigned short colors[8];
    unsigned short *pixels = (unsigned short *)s->frame->data[0];
    int stride = s->frame->linesize[0] / 2;

    stream_ptr = 0;
    skip_blocks = 0;
    blocks_wide = s->avctx->width / 4;
    blocks_high = s->avctx->height / 4;
    total_blocks = blocks_wide * blocks_high;
    block_inc = 4;
    row_dec = stride + 4;

    for (block_y = blocks_high; block_y > 0; block_y--) {
        block_ptr = ((block_y * 4) - 1) * stride;
        for (block_x = blocks_wide; block_x > 0; block_x--) {
            /* check if this block should be skipped */
            if (skip_blocks) {
                block_ptr += block_inc;
                skip_blocks--;
                total_blocks--;
                continue;
            }

            pixel_ptr = block_ptr;

            /* get the next two bytes in the encoded data stream */
            CHECK_STREAM_PTR(2);
            byte_a = s->buf[stream_ptr++];
            byte_b = s->buf[stream_ptr++];

            /* check if the decode is finished */
            if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) {
                return;
            } else if ((byte_b & 0xFC) == 0x84) {
                /* skip code, but don't count the current block */
                skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
            } else if (byte_b < 0x80) {
                /* 2- or 8-color encoding modes */
                flags = (byte_b << 8) | byte_a;

                CHECK_STREAM_PTR(4);
                colors[0] = AV_RL16(&s->buf[stream_ptr]);
                stream_ptr += 2;
                colors[1] = AV_RL16(&s->buf[stream_ptr]);
                stream_ptr += 2;

                if (colors[0] & 0x8000) {
                    /* 8-color encoding */
                    CHECK_STREAM_PTR(12);
                    colors[2] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;
                    colors[3] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;
                    colors[4] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;
                    colors[5] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;
                    colors[6] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;
                    colors[7] = AV_RL16(&s->buf[stream_ptr]);
                    stream_ptr += 2;

                    for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                        for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
                            pixels[pixel_ptr++] =
                                colors[((pixel_y & 0x2) << 1) +
                                    (pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
                        pixel_ptr -= row_dec;
                    }
                } else {
                    /* 2-color encoding */
                    for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                        for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
                            pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
                        pixel_ptr -= row_dec;
                    }
                }
            } else {
                /* otherwise, it's a 1-color block */
                colors[0] = (byte_b << 8) | byte_a;

                for (pixel_y = 0; pixel_y < 4; pixel_y++) {
                    for (pixel_x = 0; pixel_x < 4; pixel_x++)
                        pixels[pixel_ptr++] = colors[0];
                    pixel_ptr -= row_dec;
                }
            }

            block_ptr += block_inc;
            total_blocks--;
        }
    }
}

static int msvideo1_decode_frame(AVCodecContext *avctx,
                                void *data, int *got_frame,
                                AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    Msvideo1Context *s = avctx->priv_data;
    int ret;

    s->buf = buf;
    s->size = buf_size;

    // Discard frame if its smaller than the minimum frame size
    if (buf_size < (avctx->width/4) * (avctx->height/4) / 512) {
        av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
        return AVERROR_INVALIDDATA;
    }

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

    if (s->mode_8bit) {
        int size;
        const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);

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

    if (s->mode_8bit)
        msvideo1_decode_8bit(s);
    else
        msvideo1_decode_16bit(s);

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

    *got_frame      = 1;

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

static av_cold int msvideo1_decode_end(AVCodecContext *avctx)
{
    Msvideo1Context *s = avctx->priv_data;

    av_frame_free(&s->frame);

    return 0;
}

AVCodec ff_msvideo1_decoder = {
    .name           = "msvideo1",
    .long_name      = NULL_IF_CONFIG_SMALL("Microsoft Video 1"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MSVIDEO1,
    .priv_data_size = sizeof(Msvideo1Context),
    .init           = msvideo1_decode_init,
    .close          = msvideo1_decode_end,
    .decode         = msvideo1_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Microsoft Video-1 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			* Microsoft Video-1 Decoder by Mike Melanson (melanson@pcisys.net)
25			* For more information about the MS Video-1 format, visit:
26			* http://www.pcisys.net/~melanson/codecs/
27			*/
28
29			#include <stdio.h>
30			#include <stdlib.h>
31			#include <string.h>
32
33			#include "libavutil/internal.h"
34			#include "libavutil/intreadwrite.h"
35			#include "avcodec.h"
36			#include "internal.h"
37
38			#define PALETTE_COUNT 256
39			#define CHECK_STREAM_PTR(n) \
40			if ((stream_ptr + n) > s->size ) { \
41			av_log(s->avctx, AV_LOG_ERROR, " MS Video-1 warning: stream_ptr out of bounds (%d >= %d)\n", \
42			stream_ptr + n, s->size); \
43			return; \
44			}
45
46			typedef struct Msvideo1Context {
47
48			AVCodecContext *avctx;
49			AVFrame *frame;
50
51			const unsigned char *buf;
52			int size;
53
54			int mode_8bit; /* if it's not 8-bit, it's 16-bit */
55
56			uint32_t pal[256];
57			} Msvideo1Context;
58
59		13	static av_cold int msvideo1_decode_init(AVCodecContext *avctx)
60			{
61		13	Msvideo1Context *s = avctx->priv_data;
62
63		13	s->avctx = avctx;
64
65	✓✗✗✓	13	if (avctx->width < 4 \|\| avctx->height < 4)
66			return AVERROR_INVALIDDATA;
67
68			/* figure out the colorspace based on the presence of a palette */
69	✓✓	13	if (s->avctx->bits_per_coded_sample == 8) {
70		5	s->mode_8bit = 1;
71		5	avctx->pix_fmt = AV_PIX_FMT_PAL8;
72	✓✗	5	if (avctx->extradata_size >= AVPALETTE_SIZE)
73		5	memcpy(s->pal, avctx->extradata, AVPALETTE_SIZE);
74			} else {
75		8	s->mode_8bit = 0;
76		8	avctx->pix_fmt = AV_PIX_FMT_RGB555;
77			}
78
79		13	s->frame = av_frame_alloc();
80	✗✓	13	if (!s->frame)
81			return AVERROR(ENOMEM);
82
83		13	return 0;
84			}
85
86		147	static void msvideo1_decode_8bit(Msvideo1Context *s)
87			{
88			int block_ptr, pixel_ptr;
89			int total_blocks;
90			int pixel_x, pixel_y; /* pixel width and height iterators */
91			int block_x, block_y; /* block width and height iterators */
92			int blocks_wide, blocks_high; /* width and height in 4x4 blocks */
93			int block_inc;
94			int row_dec;
95
96			/* decoding parameters */
97			int stream_ptr;
98			unsigned char byte_a, byte_b;
99			unsigned short flags;
100			int skip_blocks;
101			unsigned char colors[8];
102		147	unsigned char *pixels = s->frame->data[0];
103		147	int stride = s->frame->linesize[0];
104
105		147	stream_ptr = 0;
106		147	skip_blocks = 0;
107		147	blocks_wide = s->avctx->width / 4;
108		147	blocks_high = s->avctx->height / 4;
109		147	total_blocks = blocks_wide * blocks_high;
110		147	block_inc = 4;
111		147	row_dec = stride + 4;
112
113	✓✓	3977	for (block_y = blocks_high; block_y > 0; block_y--) {
114		3830	block_ptr = ((block_y * 4) - 1) * stride;
115	✓✓	186030	for (block_x = blocks_wide; block_x > 0; block_x--) {
116			/* check if this block should be skipped */
117	✓✓	182200	if (skip_blocks) {
118		94392	block_ptr += block_inc;
119		94392	skip_blocks--;
120		94392	total_blocks--;
121		94392	continue;
122			}
123
124		87808	pixel_ptr = block_ptr;
125
126			/* get the next two bytes in the encoded data stream */
127	✗✓	87808	CHECK_STREAM_PTR(2);
128		87808	byte_a = s->buf[stream_ptr++];
129		87808	byte_b = s->buf[stream_ptr++];
130
131			/* check if the decode is finished */
132	✓✓✗✓ ✗✗	87808	if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0))
133			return;
134	✓✓	87808	else if ((byte_b & 0xFC) == 0x84) {
135			/* skip code, but don't count the current block */
136		8662	skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
137	✓✓	79146	} else if (byte_b < 0x80) {
138			/* 2-color encoding */
139		11480	flags = (byte_b << 8) \| byte_a;
140
141	✗✓	11480	CHECK_STREAM_PTR(2);
142		11480	colors[0] = s->buf[stream_ptr++];
143		11480	colors[1] = s->buf[stream_ptr++];
144
145	✓✓	57400	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
146	✓✓	229600	for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
147		183680	pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
148		45920	pixel_ptr -= row_dec;
149			}
150	✓✓	67666	} else if (byte_b >= 0x90) {
151			/* 8-color encoding */
152		56844	flags = (byte_b << 8) \| byte_a;
153
154	✗✓	56844	CHECK_STREAM_PTR(8);
155		56844	memcpy(colors, &s->buf[stream_ptr], 8);
156		56844	stream_ptr += 8;
157
158	✓✓	284220	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
159	✓✓	1136880	for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
160		909504	pixels[pixel_ptr++] =
161		909504	colors[((pixel_y & 0x2) << 1) +
162		909504	(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
163		227376	pixel_ptr -= row_dec;
164			}
165			} else {
166			/* 1-color encoding */
167		10822	colors[0] = byte_a;
168
169	✓✓	54110	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
170	✓✓	216440	for (pixel_x = 0; pixel_x < 4; pixel_x++)
171		173152	pixels[pixel_ptr++] = colors[0];
172		43288	pixel_ptr -= row_dec;
173			}
174			}
175
176		87808	block_ptr += block_inc;
177		87808	total_blocks--;
178			}
179			}
180
181			/* make the palette available on the way out */
182	✓✗	147	if (s->avctx->pix_fmt == AV_PIX_FMT_PAL8)
183		147	memcpy(s->frame->data[1], s->pal, AVPALETTE_SIZE);
184			}
185
186		180	static void msvideo1_decode_16bit(Msvideo1Context *s)
187			{
188			int block_ptr, pixel_ptr;
189			int total_blocks;
190			int pixel_x, pixel_y; /* pixel width and height iterators */
191			int block_x, block_y; /* block width and height iterators */
192			int blocks_wide, blocks_high; /* width and height in 4x4 blocks */
193			int block_inc;
194			int row_dec;
195
196			/* decoding parameters */
197			int stream_ptr;
198			unsigned char byte_a, byte_b;
199			unsigned short flags;
200			int skip_blocks;
201			unsigned short colors[8];
202		180	unsigned short pixels = (unsigned short )s->frame->data[0];
203		180	int stride = s->frame->linesize[0] / 2;
204
205		180	stream_ptr = 0;
206		180	skip_blocks = 0;
207		180	blocks_wide = s->avctx->width / 4;
208		180	blocks_high = s->avctx->height / 4;
209		180	total_blocks = blocks_wide * blocks_high;
210		180	block_inc = 4;
211		180	row_dec = stride + 4;
212
213	✓✓	12090	for (block_y = blocks_high; block_y > 0; block_y--) {
214		11910	block_ptr = ((block_y * 4) - 1) * stride;
215	✓✓	1003380	for (block_x = blocks_wide; block_x > 0; block_x--) {
216			/* check if this block should be skipped */
217	✓✓	991470	if (skip_blocks) {
218		281140	block_ptr += block_inc;
219		281140	skip_blocks--;
220		281140	total_blocks--;
221		281140	continue;
222			}
223
224		710330	pixel_ptr = block_ptr;
225
226			/* get the next two bytes in the encoded data stream */
227	✗✓	710330	CHECK_STREAM_PTR(2);
228		710330	byte_a = s->buf[stream_ptr++];
229		710330	byte_b = s->buf[stream_ptr++];
230
231			/* check if the decode is finished */
232	✓✓✗✓ ✗✗	710330	if ((byte_a == 0) && (byte_b == 0) && (total_blocks == 0)) {
233			return;
234	✓✓	710330	} else if ((byte_b & 0xFC) == 0x84) {
235			/* skip code, but don't count the current block */
236		108271	skip_blocks = ((byte_b - 0x84) << 8) + byte_a - 1;
237	✓✓	602059	} else if (byte_b < 0x80) {
238			/* 2- or 8-color encoding modes */
239		280291	flags = (byte_b << 8) \| byte_a;
240
241	✗✓	280291	CHECK_STREAM_PTR(4);
242		280291	colors[0] = AV_RL16(&s->buf[stream_ptr]);
243		280291	stream_ptr += 2;
244		280291	colors[1] = AV_RL16(&s->buf[stream_ptr]);
245		280291	stream_ptr += 2;
246
247	✓✓	280291	if (colors[0] & 0x8000) {
248			/* 8-color encoding */
249	✗✓	145448	CHECK_STREAM_PTR(12);
250		145448	colors[2] = AV_RL16(&s->buf[stream_ptr]);
251		145448	stream_ptr += 2;
252		145448	colors[3] = AV_RL16(&s->buf[stream_ptr]);
253		145448	stream_ptr += 2;
254		145448	colors[4] = AV_RL16(&s->buf[stream_ptr]);
255		145448	stream_ptr += 2;
256		145448	colors[5] = AV_RL16(&s->buf[stream_ptr]);
257		145448	stream_ptr += 2;
258		145448	colors[6] = AV_RL16(&s->buf[stream_ptr]);
259		145448	stream_ptr += 2;
260		145448	colors[7] = AV_RL16(&s->buf[stream_ptr]);
261		145448	stream_ptr += 2;
262
263	✓✓	727240	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
264	✓✓	2908960	for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
265		2327168	pixels[pixel_ptr++] =
266		2327168	colors[((pixel_y & 0x2) << 1) +
267		2327168	(pixel_x & 0x2) + ((flags & 0x1) ^ 1)];
268		581792	pixel_ptr -= row_dec;
269			}
270			} else {
271			/* 2-color encoding */
272	✓✓	674215	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
273	✓✓	2696860	for (pixel_x = 0; pixel_x < 4; pixel_x++, flags >>= 1)
274		2157488	pixels[pixel_ptr++] = colors[(flags & 0x1) ^ 1];
275		539372	pixel_ptr -= row_dec;
276			}
277			}
278			} else {
279			/* otherwise, it's a 1-color block */
280		321768	colors[0] = (byte_b << 8) \| byte_a;
281
282	✓✓	1608840	for (pixel_y = 0; pixel_y < 4; pixel_y++) {
283	✓✓	6435360	for (pixel_x = 0; pixel_x < 4; pixel_x++)
284		5148288	pixels[pixel_ptr++] = colors[0];
285		1287072	pixel_ptr -= row_dec;
286			}
287			}
288
289		710330	block_ptr += block_inc;
290		710330	total_blocks--;
291			}
292			}
293			}
294
295		327	static int msvideo1_decode_frame(AVCodecContext *avctx,
296			void data, int got_frame,
297			AVPacket *avpkt)
298			{
299		327	const uint8_t *buf = avpkt->data;
300		327	int buf_size = avpkt->size;
301		327	Msvideo1Context *s = avctx->priv_data;
302			int ret;
303
304		327	s->buf = buf;
305		327	s->size = buf_size;
306
307			// Discard frame if its smaller than the minimum frame size
308	✗✓	327	if (buf_size < (avctx->width/4) * (avctx->height/4) / 512) {
309			av_log(avctx, AV_LOG_ERROR, "Packet is too small\n");
310			return AVERROR_INVALIDDATA;
311			}
312
313	✗✓	327	if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
314			return ret;
315
316	✓✓	327	if (s->mode_8bit) {
317			int size;
318		147	const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &size);
319
320	✓✓✓✗	147	if (pal && size == AVPALETTE_SIZE) {
321		4	memcpy(s->pal, pal, AVPALETTE_SIZE);
322		4	s->frame->palette_has_changed = 1;
323	✗✓	143	} else if (pal) {
324			av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", size);
325			}
326			}
327
328	✓✓	327	if (s->mode_8bit)
329		147	msvideo1_decode_8bit(s);
330			else
331		180	msvideo1_decode_16bit(s);
332
333	✗✓	327	if ((ret = av_frame_ref(data, s->frame)) < 0)
334			return ret;
335
336		327	*got_frame = 1;
337
338			/* report that the buffer was completely consumed */
339		327	return buf_size;
340			}
341
342		13	static av_cold int msvideo1_decode_end(AVCodecContext *avctx)
343			{
344		13	Msvideo1Context *s = avctx->priv_data;
345
346		13	av_frame_free(&s->frame);
347
348		13	return 0;
349			}
350
351			AVCodec ff_msvideo1_decoder = {
352			.name = "msvideo1",
353			.long_name = NULL_IF_CONFIG_SMALL("Microsoft Video 1"),
354			.type = AVMEDIA_TYPE_VIDEO,
355			.id = AV_CODEC_ID_MSVIDEO1,
356			.priv_data_size = sizeof(Msvideo1Context),
357			.init = msvideo1_decode_init,
358			.close = msvideo1_decode_end,
359			.decode = msvideo1_decode_frame,
360			.capabilities = AV_CODEC_CAP_DR1,
361			};