FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/msvideo1.c	Lines:	151	159	95.0 %
Date:	2021-04-19 06:27:07	Branches:	74	94	78.7 %


/*
 * 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 "decode.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) {
        s->frame->palette_has_changed = ff_copy_palette(s->pal, avpkt, avctx);
    }

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