FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/motionpixels.c	Lines:	167	190	87.9 %
Date:	2020-09-25 23:16:12	Branches:	77	100	77.0 %


/*
 * Motion Pixels Video Decoder
 * Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
 *
 * 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
 */

#include "avcodec.h"
#include "get_bits.h"
#include "bswapdsp.h"
#include "internal.h"

#define MAX_HUFF_CODES 16

#include "motionpixels_tablegen.h"

typedef struct HuffCode {
    int code;
    uint8_t size;
    uint8_t delta;
} HuffCode;

typedef struct MotionPixelsContext {
    AVCodecContext *avctx;
    AVFrame *frame;
    BswapDSPContext bdsp;
    uint8_t *changes_map;
    int offset_bits_len;
    int codes_count, current_codes_count;
    int max_codes_bits;
    HuffCode codes[MAX_HUFF_CODES];
    VLC vlc;
    YuvPixel *vpt, *hpt;
    uint8_t gradient_scale[3];
    uint8_t *bswapbuf;
    int bswapbuf_size;
} MotionPixelsContext;

static av_cold int mp_decode_end(AVCodecContext *avctx)
{
    MotionPixelsContext *mp = avctx->priv_data;

    av_freep(&mp->changes_map);
    av_freep(&mp->vpt);
    av_freep(&mp->hpt);
    av_freep(&mp->bswapbuf);
    av_frame_free(&mp->frame);

    return 0;
}

static av_cold int mp_decode_init(AVCodecContext *avctx)
{
    MotionPixelsContext *mp = avctx->priv_data;
    int w4 = (avctx->width  + 3) & ~3;
    int h4 = (avctx->height + 3) & ~3;

    if(avctx->extradata_size < 2){
        av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
        return AVERROR_INVALIDDATA;
    }

    motionpixels_tableinit();
    mp->avctx = avctx;
    ff_bswapdsp_init(&mp->bdsp);
    mp->changes_map = av_mallocz_array(avctx->width, h4);
    mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
    mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
    mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
    if (!mp->changes_map || !mp->vpt || !mp->hpt)
        return AVERROR(ENOMEM);
    avctx->pix_fmt = AV_PIX_FMT_RGB555;

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

    return 0;
}

static void mp_read_changes_map(MotionPixelsContext *mp, GetBitContext *gb, int count, int bits_len, int read_color)
{
    uint16_t *pixels;
    int offset, w, h, color = 0, x, y, i;

    while (count--) {
        offset = get_bits_long(gb, mp->offset_bits_len);
        w      = get_bits(gb, bits_len) + 1;
        h      = get_bits(gb, bits_len) + 1;
        if (read_color)
            color = get_bits(gb, 15);
        x = offset % mp->avctx->width;
        y = offset / mp->avctx->width;
        if (y >= mp->avctx->height)
            continue;
        w = FFMIN(w, mp->avctx->width  - x);
        h = FFMIN(h, mp->avctx->height - y);
        pixels = (uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
        while (h--) {
            mp->changes_map[offset] = w;
            if (read_color)
                for (i = 0; i < w; ++i)
                    pixels[i] = color;
            offset += mp->avctx->width;
            pixels += mp->frame->linesize[0] / 2;
        }
    }
}

static int mp_get_code(MotionPixelsContext *mp, GetBitContext *gb, int size, int code)
{
    while (get_bits1(gb)) {
        ++size;
        if (size > mp->max_codes_bits) {
            av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
            return AVERROR_INVALIDDATA;
        }
        code <<= 1;
        if (mp_get_code(mp, gb, size, code + 1) < 0)
            return AVERROR_INVALIDDATA;
    }
    if (mp->current_codes_count >= MAX_HUFF_CODES) {
        av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
        return AVERROR_INVALIDDATA;
    }

    mp->codes[mp->current_codes_count  ].code = code;
    mp->codes[mp->current_codes_count++].size = size;
    return 0;
}

static int mp_read_codes_table(MotionPixelsContext *mp, GetBitContext *gb)
{
    if (mp->codes_count == 1) {
        mp->codes[0].delta = get_bits(gb, 4);
    } else {
        int i;
        int ret;

        mp->max_codes_bits = get_bits(gb, 4);
        for (i = 0; i < mp->codes_count; ++i)
            mp->codes[i].delta = get_bits(gb, 4);
        mp->current_codes_count = 0;
        if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
            return ret;
        if (mp->current_codes_count < mp->codes_count) {
            av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
            return AVERROR_INVALIDDATA;
        }
   }
   return 0;
}

static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
{
    int delta;

    delta = (v - 7) * mp->gradient_scale[component];
    mp->gradient_scale[component] = (v == 0 || v == 14) ? 2 : 1;
    return delta;
}

static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
{
    int color;

    color = *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
    return mp_rgb_yuv_table[color];
}

static void mp_set_rgb_from_yuv(MotionPixelsContext *mp, int x, int y, const YuvPixel *p)
{
    int color;

    color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
    *(uint16_t *)&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
}

static av_always_inline int mp_get_vlc(MotionPixelsContext *mp, GetBitContext *gb)
{
    int i;

    i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
    if (i < 0)
        return i;
    return mp->codes[i].delta;
}

static void mp_decode_line(MotionPixelsContext *mp, GetBitContext *gb, int y)
{
    YuvPixel p;
    const int y0 = y * mp->avctx->width;
    int w, i, x = 0;

    p = mp->vpt[y];
    if (mp->changes_map[y0 + x] == 0) {
        memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
        ++x;
    }
    while (x < mp->avctx->width) {
        w = mp->changes_map[y0 + x];
        if (w != 0) {
            if ((y & 3) == 0) {
                if (mp->changes_map[y0 + x + mp->avctx->width] < w ||
                    mp->changes_map[y0 + x + mp->avctx->width * 2] < w ||
                    mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
                    for (i = (x + 3) & ~3; i < x + w; i += 4) {
                        mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
                    }
                }
            }
            x += w;
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
            p = mp_get_yuv_from_rgb(mp, x - 1, y);
        } else {
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
            p.y = av_clip_uintp2(p.y, 5);
            if ((x & 3) == 0) {
                if ((y & 3) == 0) {
                    p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
                    p.v = av_clip_intp2(p.v, 5);
                    p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
                    p.u = av_clip_intp2(p.u, 5);
                    mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
                } else {
                    p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
                    p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
                }
            }
            mp_set_rgb_from_yuv(mp, x, y, &p);
            ++x;
        }
    }
}

static void mp_decode_frame_helper(MotionPixelsContext *mp, GetBitContext *gb)
{
    YuvPixel p;
    int y, y0;

    av_assert1(mp->changes_map[0]);

    for (y = 0; y < mp->avctx->height; ++y) {
        if (mp->changes_map[y * mp->avctx->width] != 0) {
            memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
            p = mp_get_yuv_from_rgb(mp, 0, y);
        } else {
            p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
            p.y = av_clip_uintp2(p.y, 5);
            if ((y & 3) == 0) {
                p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
                p.v = av_clip_intp2(p.v, 5);
                p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
                p.u = av_clip_intp2(p.u, 5);
            }
            mp->vpt[y] = p;
            mp_set_rgb_from_yuv(mp, 0, y, &p);
        }
    }
    for (y0 = 0; y0 < 2; ++y0)
        for (y = y0; y < mp->avctx->height; y += 2)
            mp_decode_line(mp, gb, y);
}

static int mp_decode_frame(AVCodecContext *avctx,
                                 void *data, int *got_frame,
                                 AVPacket *avpkt)
{
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
    MotionPixelsContext *mp = avctx->priv_data;
    GetBitContext gb;
    int i, count1, count2, sz, ret;

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

    /* le32 bitstream msb first */
    av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
    if (!mp->bswapbuf)
        return AVERROR(ENOMEM);
    mp->bdsp.bswap_buf((uint32_t *) mp->bswapbuf, (const uint32_t *) buf,
                       buf_size / 4);
    if (buf_size & 3)
        memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
    init_get_bits(&gb, mp->bswapbuf, buf_size * 8);

    memset(mp->changes_map, 0, avctx->width * avctx->height);
    for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
        count1 = get_bits(&gb, 12);
        count2 = get_bits(&gb, 12);
        mp_read_changes_map(mp, &gb, count1, 8, i);
        mp_read_changes_map(mp, &gb, count2, 4, i);
    }

    mp->codes_count = get_bits(&gb, 4);
    if (mp->codes_count == 0)
        goto end;

    if (mp->changes_map[0] == 0) {
        *(uint16_t *)mp->frame->data[0] = get_bits(&gb, 15);
        mp->changes_map[0] = 1;
    }
    if (mp_read_codes_table(mp, &gb) < 0)
        goto end;

    sz = get_bits(&gb, 18);
    if (avctx->extradata[0] != 5)
        sz += get_bits(&gb, 18);
    if (sz == 0)
        goto end;

    if (mp->max_codes_bits <= 0)
        goto end;
    if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
        goto end;
    mp_decode_frame_helper(mp, &gb);
    ff_free_vlc(&mp->vlc);

end:
    if ((ret = av_frame_ref(data, mp->frame)) < 0)
        return ret;
    *got_frame       = 1;
    return buf_size;
}

AVCodec ff_motionpixels_decoder = {
    .name           = "motionpixels",
    .long_name      = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_MOTIONPIXELS,
    .priv_data_size = sizeof(MotionPixelsContext),
    .init           = mp_decode_init,
    .close          = mp_decode_end,
    .decode         = mp_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Motion Pixels Video Decoder
3			* Copyright (c) 2008 Gregory Montoir (cyx@users.sourceforge.net)
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			#include "avcodec.h"
23			#include "get_bits.h"
24			#include "bswapdsp.h"
25			#include "internal.h"
26
27			#define MAX_HUFF_CODES 16
28
29			#include "motionpixels_tablegen.h"
30
31			typedef struct HuffCode {
32			int code;
33			uint8_t size;
34			uint8_t delta;
35			} HuffCode;
36
37			typedef struct MotionPixelsContext {
38			AVCodecContext *avctx;
39			AVFrame *frame;
40			BswapDSPContext bdsp;
41			uint8_t *changes_map;
42			int offset_bits_len;
43			int codes_count, current_codes_count;
44			int max_codes_bits;
45			HuffCode codes[MAX_HUFF_CODES];
46			VLC vlc;
47			YuvPixel vpt, hpt;
48			uint8_t gradient_scale[3];
49			uint8_t *bswapbuf;
50			int bswapbuf_size;
51			} MotionPixelsContext;
52
53		2	static av_cold int mp_decode_end(AVCodecContext *avctx)
54			{
55		2	MotionPixelsContext *mp = avctx->priv_data;
56
57		2	av_freep(&mp->changes_map);
58		2	av_freep(&mp->vpt);
59		2	av_freep(&mp->hpt);
60		2	av_freep(&mp->bswapbuf);
61		2	av_frame_free(&mp->frame);
62
63		2	return 0;
64			}
65
66		2	static av_cold int mp_decode_init(AVCodecContext *avctx)
67			{
68		2	MotionPixelsContext *mp = avctx->priv_data;
69		2	int w4 = (avctx->width + 3) & ~3;
70		2	int h4 = (avctx->height + 3) & ~3;
71
72	✗✓	2	if(avctx->extradata_size < 2){
73			av_log(avctx, AV_LOG_ERROR, "extradata too small\n");
74			return AVERROR_INVALIDDATA;
75			}
76
77		2	motionpixels_tableinit();
78		2	mp->avctx = avctx;
79		2	ff_bswapdsp_init(&mp->bdsp);
80		2	mp->changes_map = av_mallocz_array(avctx->width, h4);
81		2	mp->offset_bits_len = av_log2(avctx->width * avctx->height) + 1;
82		2	mp->vpt = av_mallocz_array(avctx->height, sizeof(YuvPixel));
83		2	mp->hpt = av_mallocz_array(h4 / 4, w4 / 4 * sizeof(YuvPixel));
84	✓✗✓✗ ✗✓	2	if (!mp->changes_map \|\| !mp->vpt \|\| !mp->hpt)
85			return AVERROR(ENOMEM);
86		2	avctx->pix_fmt = AV_PIX_FMT_RGB555;
87
88		2	mp->frame = av_frame_alloc();
89	✗✓	2	if (!mp->frame)
90			return AVERROR(ENOMEM);
91
92		2	return 0;
93			}
94
95		444	static void mp_read_changes_map(MotionPixelsContext mp, GetBitContext gb, int count, int bits_len, int read_color)
96			{
97			uint16_t *pixels;
98		444	int offset, w, h, color = 0, x, y, i;
99
100	✓✓	27419	while (count--) {
101		26975	offset = get_bits_long(gb, mp->offset_bits_len);
102		26975	w = get_bits(gb, bits_len) + 1;
103		26975	h = get_bits(gb, bits_len) + 1;
104	✓✓	26975	if (read_color)
105		16095	color = get_bits(gb, 15);
106		26975	x = offset % mp->avctx->width;
107		26975	y = offset / mp->avctx->width;
108	✗✓	26975	if (y >= mp->avctx->height)
109			continue;
110		26975	w = FFMIN(w, mp->avctx->width - x);
111		26975	h = FFMIN(h, mp->avctx->height - y);
112		26975	pixels = (uint16_t )&mp->frame->data[0][y mp->frame->linesize[0] + x * 2];
113	✓✓	325261	while (h--) {
114		298286	mp->changes_map[offset] = w;
115	✓✓	298286	if (read_color)
116	✓✓	1832851	for (i = 0; i < w; ++i)
117		1646821	pixels[i] = color;
118		298286	offset += mp->avctx->width;
119		298286	pixels += mp->frame->linesize[0] / 2;
120			}
121			}
122		444	}
123
124		1651	static int mp_get_code(MotionPixelsContext mp, GetBitContext gb, int size, int code)
125			{
126	✓✓	3191	while (get_bits1(gb)) {
127		1540	++size;
128	✗✓	1540	if (size > mp->max_codes_bits) {
129			av_log(mp->avctx, AV_LOG_ERROR, "invalid code size %d/%d\n", size, mp->max_codes_bits);
130			return AVERROR_INVALIDDATA;
131			}
132		1540	code <<= 1;
133	✗✓	1540	if (mp_get_code(mp, gb, size, code + 1) < 0)
134			return AVERROR_INVALIDDATA;
135			}
136	✗✓	1651	if (mp->current_codes_count >= MAX_HUFF_CODES) {
137			av_log(mp->avctx, AV_LOG_ERROR, "too many codes\n");
138			return AVERROR_INVALIDDATA;
139			}
140
141		1651	mp->codes[mp->current_codes_count ].code = code;
142		1651	mp->codes[mp->current_codes_count++].size = size;
143		1651	return 0;
144			}
145
146		111	static int mp_read_codes_table(MotionPixelsContext mp, GetBitContext gb)
147			{
148	✗✓	111	if (mp->codes_count == 1) {
149			mp->codes[0].delta = get_bits(gb, 4);
150			} else {
151			int i;
152			int ret;
153
154		111	mp->max_codes_bits = get_bits(gb, 4);
155	✓✓	1762	for (i = 0; i < mp->codes_count; ++i)
156		1651	mp->codes[i].delta = get_bits(gb, 4);
157		111	mp->current_codes_count = 0;
158	✗✓	111	if ((ret = mp_get_code(mp, gb, 0, 0)) < 0)
159			return ret;
160	✗✓	111	if (mp->current_codes_count < mp->codes_count) {
161			av_log(mp->avctx, AV_LOG_ERROR, "too few codes\n");
162			return AVERROR_INVALIDDATA;
163			}
164			}
165		111	return 0;
166			}
167
168		6395631	static av_always_inline int mp_gradient(MotionPixelsContext *mp, int component, int v)
169			{
170			int delta;
171
172		6395631	delta = (v - 7) * mp->gradient_scale[component];
173	✓✓✓✓	6395631	mp->gradient_scale[component] = (v == 0 \|\| v == 14) ? 2 : 1;
174		6395631	return delta;
175			}
176
177		340991	static YuvPixel mp_get_yuv_from_rgb(MotionPixelsContext *mp, int x, int y)
178			{
179			int color;
180
181		340991	color = (uint16_t )&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2];
182		340991	return mp_rgb_yuv_table[color];
183			}
184
185		5666143	static void mp_set_rgb_from_yuv(MotionPixelsContext mp, int x, int y, const YuvPixel p)
186			{
187			int color;
188
189		5666143	color = mp_yuv_to_rgb(p->y, p->v, p->u, 1);
190		5666143	(uint16_t )&mp->frame->data[0][y * mp->frame->linesize[0] + x * 2] = color;
191		5666143	}
192
193		6395631	static av_always_inline int mp_get_vlc(MotionPixelsContext mp, GetBitContext gb)
194			{
195			int i;
196
197	✓✗	6395631	i = (mp->codes_count == 1) ? 0 : get_vlc2(gb, mp->vlc.table, mp->max_codes_bits, 1);
198	✗✓	6395631	if (i < 0)
199			return i;
200		6395631	return mp->codes[i].delta;
201			}
202
203		26640	static void mp_decode_line(MotionPixelsContext mp, GetBitContext gb, int y)
204			{
205			YuvPixel p;
206		26640	const int y0 = y * mp->avctx->width;
207		26640	int w, i, x = 0;
208
209		26640	p = mp->vpt[y];
210	✓✓	26640	if (mp->changes_map[y0 + x] == 0) {
211		18532	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
212		18532	++x;
213			}
214	✓✓	5972637	while (x < mp->avctx->width) {
215		5945997	w = mp->changes_map[y0 + x];
216	✓✓	5945997	if (w != 0) {
217	✓✓	298386	if ((y & 3) == 0) {
218	✓✓	73166	if (mp->changes_map[y0 + x + mp->avctx->width] < w \|\|
219	✓✓	69448	mp->changes_map[y0 + x + mp->avctx->width * 2] < w \|\|
220	✓✓	65081	mp->changes_map[y0 + x + mp->avctx->width * 3] < w) {
221	✓✓	47814	for (i = (x + 3) & ~3; i < x + w; i += 4) {
222		34497	mp->hpt[((y / 4) * mp->avctx->width + i) / 4] = mp_get_yuv_from_rgb(mp, i, y);
223			}
224			}
225			}
226		298386	x += w;
227		298386	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
228		298386	p = mp_get_yuv_from_rgb(mp, x - 1, y);
229			} else {
230		5647611	p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
231		5647611	p.y = av_clip_uintp2(p.y, 5);
232	✓✓	5647611	if ((x & 3) == 0) {
233	✓✓	1417461	if ((y & 3) == 0) {
234		360154	p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
235		360154	p.v = av_clip_intp2(p.v, 5);
236		360154	p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
237		360154	p.u = av_clip_intp2(p.u, 5);
238		360154	mp->hpt[((y / 4) * mp->avctx->width + x) / 4] = p;
239			} else {
240		1057307	p.v = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].v;
241		1057307	p.u = mp->hpt[((y / 4) * mp->avctx->width + x) / 4].u;
242			}
243			}
244		5647611	mp_set_rgb_from_yuv(mp, x, y, &p);
245		5647611	++x;
246			}
247			}
248		26640	}
249
250		111	static void mp_decode_frame_helper(MotionPixelsContext mp, GetBitContext gb)
251			{
252			YuvPixel p;
253			int y, y0;
254
255			av_assert1(mp->changes_map[0]);
256
257	✓✓	26751	for (y = 0; y < mp->avctx->height; ++y) {
258	✓✓	26640	if (mp->changes_map[y * mp->avctx->width] != 0) {
259		8108	memset(mp->gradient_scale, 1, sizeof(mp->gradient_scale));
260		8108	p = mp_get_yuv_from_rgb(mp, 0, y);
261			} else {
262		18532	p.y += mp_gradient(mp, 0, mp_get_vlc(mp, gb));
263		18532	p.y = av_clip_uintp2(p.y, 5);
264	✓✓	18532	if ((y & 3) == 0) {
265		4590	p.v += mp_gradient(mp, 1, mp_get_vlc(mp, gb));
266		4590	p.v = av_clip_intp2(p.v, 5);
267		4590	p.u += mp_gradient(mp, 2, mp_get_vlc(mp, gb));
268		4590	p.u = av_clip_intp2(p.u, 5);
269			}
270		18532	mp->vpt[y] = p;
271		18532	mp_set_rgb_from_yuv(mp, 0, y, &p);
272			}
273			}
274	✓✓	333	for (y0 = 0; y0 < 2; ++y0)
275	✓✓	26862	for (y = y0; y < mp->avctx->height; y += 2)
276		26640	mp_decode_line(mp, gb, y);
277		111	}
278
279		111	static int mp_decode_frame(AVCodecContext *avctx,
280			void data, int got_frame,
281			AVPacket *avpkt)
282			{
283		111	const uint8_t *buf = avpkt->data;
284		111	int buf_size = avpkt->size;
285		111	MotionPixelsContext *mp = avctx->priv_data;
286			GetBitContext gb;
287			int i, count1, count2, sz, ret;
288
289	✗✓	111	if ((ret = ff_reget_buffer(avctx, mp->frame, 0)) < 0)
290			return ret;
291
292			/* le32 bitstream msb first */
293		111	av_fast_padded_malloc(&mp->bswapbuf, &mp->bswapbuf_size, buf_size);
294	✗✓	111	if (!mp->bswapbuf)
295			return AVERROR(ENOMEM);
296		111	mp->bdsp.bswap_buf((uint32_t ) mp->bswapbuf, (const uint32_t ) buf,
297			buf_size / 4);
298	✓✓	111	if (buf_size & 3)
299		87	memcpy(mp->bswapbuf + (buf_size & ~3), buf + (buf_size & ~3), buf_size & 3);
300		111	init_get_bits(&gb, mp->bswapbuf, buf_size * 8);
301
302		111	memset(mp->changes_map, 0, avctx->width * avctx->height);
303	✓✓	333	for (i = !(avctx->extradata[1] & 2); i < 2; ++i) {
304		222	count1 = get_bits(&gb, 12);
305		222	count2 = get_bits(&gb, 12);
306		222	mp_read_changes_map(mp, &gb, count1, 8, i);
307		222	mp_read_changes_map(mp, &gb, count2, 4, i);
308			}
309
310		111	mp->codes_count = get_bits(&gb, 4);
311	✗✓	111	if (mp->codes_count == 0)
312			goto end;
313
314	✓✓	111	if (mp->changes_map[0] == 0) {
315		100	(uint16_t )mp->frame->data[0] = get_bits(&gb, 15);
316		100	mp->changes_map[0] = 1;
317			}
318	✗✓	111	if (mp_read_codes_table(mp, &gb) < 0)
319			goto end;
320
321		111	sz = get_bits(&gb, 18);
322	✓✗	111	if (avctx->extradata[0] != 5)
323		111	sz += get_bits(&gb, 18);
324	✗✓	111	if (sz == 0)
325			goto end;
326
327	✗✓	111	if (mp->max_codes_bits <= 0)
328			goto end;
329	✗✓	111	if (init_vlc(&mp->vlc, mp->max_codes_bits, mp->codes_count, &mp->codes[0].size, sizeof(HuffCode), 1, &mp->codes[0].code, sizeof(HuffCode), 4, 0))
330			goto end;
331		111	mp_decode_frame_helper(mp, &gb);
332		111	ff_free_vlc(&mp->vlc);
333
334		111	end:
335	✗✓	111	if ((ret = av_frame_ref(data, mp->frame)) < 0)
336			return ret;
337		111	*got_frame = 1;
338		111	return buf_size;
339			}
340
341			AVCodec ff_motionpixels_decoder = {
342			.name = "motionpixels",
343			.long_name = NULL_IF_CONFIG_SMALL("Motion Pixels video"),
344			.type = AVMEDIA_TYPE_VIDEO,
345			.id = AV_CODEC_ID_MOTIONPIXELS,
346			.priv_data_size = sizeof(MotionPixelsContext),
347			.init = mp_decode_init,
348			.close = mp_decode_end,
349			.decode = mp_decode_frame,
350			.capabilities = AV_CODEC_CAP_DR1,
351			.caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
352			};