FFmpeg coverage

GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/screenpresso.c	Lines:	65	76	85.5 %
Date:	2021-04-14 23:45:22	Branches:	19	26	73.1 %


/*
 * Screenpresso decoder
 * Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
 *
 * 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
 * Screenpresso decoder
 *
 * Fourcc: SPV1
 *
 * Screenpresso simply horizontally flips and then deflates frames,
 * alternating full pictures and deltas. Deltas are related to the currently
 * rebuilt frame (not the reference), and since there is no coordinate system
 * they contain exactly as many pixel as the keyframe.
 *
 * Supports: BGR0, BGR24, RGB555
 */

#include <stdint.h>
#include <string.h>
#include <zlib.h>

#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/mem.h"

#include "avcodec.h"
#include "internal.h"

typedef struct ScreenpressoContext {
    AVFrame *current;

    /* zlib interaction */
    uint8_t *inflated_buf;
    uLongf inflated_size;
} ScreenpressoContext;

static av_cold int screenpresso_close(AVCodecContext *avctx)
{
    ScreenpressoContext *ctx = avctx->priv_data;

    av_frame_free(&ctx->current);
    av_freep(&ctx->inflated_buf);

    return 0;
}

static av_cold int screenpresso_init(AVCodecContext *avctx)
{
    ScreenpressoContext *ctx = avctx->priv_data;

    /* These needs to be set to estimate uncompressed buffer */
    int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
    if (ret < 0) {
        av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
               avctx->width, avctx->height);
        return ret;
    }

    /* Allocate current frame */
    ctx->current = av_frame_alloc();
    if (!ctx->current)
        return AVERROR(ENOMEM);

    /* Allocate maximum size possible, a full RGBA frame */
    ctx->inflated_size = avctx->width * avctx->height * 4;
    ctx->inflated_buf  = av_malloc(ctx->inflated_size);
    if (!ctx->inflated_buf)
        return AVERROR(ENOMEM);

    return 0;
}

static void sum_delta_flipped(uint8_t       *dst, int dst_linesize,
                              const uint8_t *src, int src_linesize,
                              int bytewidth, int height)
{
    int i;
    for (; height > 0; height--) {
        const uint8_t *src1 = &src[(height - 1) * src_linesize];
        for (i = 0; i < bytewidth; i++)
            dst[i] += src1[i];
        dst += dst_linesize;
    }
}

static int screenpresso_decode_frame(AVCodecContext *avctx, void *data,
                                     int *got_frame, AVPacket *avpkt)
{
    ScreenpressoContext *ctx = avctx->priv_data;
    AVFrame *frame = data;
    uLongf length = ctx->inflated_size;
    int keyframe, component_size, src_linesize;
    int ret;

    /* Size check */
    if (avpkt->size < 3) {
        av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
        return AVERROR_INVALIDDATA;
    }

    /* Compression level (4 bits) and keyframe information (1 bit) */
    av_log(avctx, AV_LOG_DEBUG, "Compression level %d\n", avpkt->data[0] >> 4);
    keyframe = avpkt->data[0] & 1;

    /* Pixel size */
    component_size = ((avpkt->data[1] >> 2) & 0x03) + 1;
    switch (component_size) {
    case 2:
        avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
        break;
    case 3:
        avctx->pix_fmt = AV_PIX_FMT_BGR24;
        break;
    case 4:
        avctx->pix_fmt = AV_PIX_FMT_BGR0;
        break;
    default:
        av_log(avctx, AV_LOG_ERROR, "Invalid bits per pixel value (%d)\n",
               component_size);
        return AVERROR_INVALIDDATA;
    }

    /* Inflate the frame after the 2 byte header */
    ret = uncompress(ctx->inflated_buf, &length,
                     avpkt->data + 2, avpkt->size - 2);
    if (ret) {
        av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
        return AVERROR_UNKNOWN;
    }

    ret = ff_reget_buffer(avctx, ctx->current, 0);
    if (ret < 0)
        return ret;

    /* Codec has aligned strides */
    src_linesize = FFALIGN(avctx->width * component_size, 4);

    /* When a keyframe is found, copy it (flipped) */
    if (keyframe)
        av_image_copy_plane(ctx->current->data[0] +
                            ctx->current->linesize[0] * (avctx->height - 1),
                            -1 * ctx->current->linesize[0],
                            ctx->inflated_buf, src_linesize,
                            avctx->width * component_size, avctx->height);
    /* Otherwise sum the delta on top of the current frame */
    else
        sum_delta_flipped(ctx->current->data[0], ctx->current->linesize[0],
                          ctx->inflated_buf, src_linesize,
                          avctx->width * component_size, avctx->height);

    /* Frame is ready to be output */
    ret = av_frame_ref(frame, ctx->current);
    if (ret < 0)
        return ret;

    /* Usual properties */
    if (keyframe) {
        frame->pict_type = AV_PICTURE_TYPE_I;
        frame->key_frame = 1;
    } else {
        frame->pict_type = AV_PICTURE_TYPE_P;
    }
    *got_frame = 1;

    return avpkt->size;
}

AVCodec ff_screenpresso_decoder = {
    .name           = "screenpresso",
    .long_name      = NULL_IF_CONFIG_SMALL("Screenpresso"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_SCREENPRESSO,
    .init           = screenpresso_init,
    .decode         = screenpresso_decode_frame,
    .close          = screenpresso_close,
    .priv_data_size = sizeof(ScreenpressoContext),
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE |
                      FF_CODEC_CAP_INIT_CLEANUP,
};


Generated by: GCOVR (Version 4.2)

Line	Branch	Exec	Source
1			/*
2			* Screenpresso decoder
3			* Copyright (C) 2015 Vittorio Giovara <vittorio.giovara@gmail.com>
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			* Screenpresso decoder
25			*
26			* Fourcc: SPV1
27			*
28			* Screenpresso simply horizontally flips and then deflates frames,
29			* alternating full pictures and deltas. Deltas are related to the currently
30			* rebuilt frame (not the reference), and since there is no coordinate system
31			* they contain exactly as many pixel as the keyframe.
32			*
33			* Supports: BGR0, BGR24, RGB555
34			*/
35
36			#include <stdint.h>
37			#include <string.h>
38			#include <zlib.h>
39
40			#include "libavutil/imgutils.h"
41			#include "libavutil/internal.h"
42			#include "libavutil/mem.h"
43
44			#include "avcodec.h"
45			#include "internal.h"
46
47			typedef struct ScreenpressoContext {
48			AVFrame *current;
49
50			/* zlib interaction */
51			uint8_t *inflated_buf;
52			uLongf inflated_size;
53			} ScreenpressoContext;
54
55		6	static av_cold int screenpresso_close(AVCodecContext *avctx)
56			{
57		6	ScreenpressoContext *ctx = avctx->priv_data;
58
59		6	av_frame_free(&ctx->current);
60		6	av_freep(&ctx->inflated_buf);
61
62		6	return 0;
63			}
64
65		6	static av_cold int screenpresso_init(AVCodecContext *avctx)
66			{
67		6	ScreenpressoContext *ctx = avctx->priv_data;
68
69			/* These needs to be set to estimate uncompressed buffer */
70		6	int ret = av_image_check_size(avctx->width, avctx->height, 0, avctx);
71	✗✓	6	if (ret < 0) {
72			av_log(avctx, AV_LOG_ERROR, "Invalid image size %dx%d.\n",
73			avctx->width, avctx->height);
74			return ret;
75			}
76
77			/* Allocate current frame */
78		6	ctx->current = av_frame_alloc();
79	✗✓	6	if (!ctx->current)
80			return AVERROR(ENOMEM);
81
82			/* Allocate maximum size possible, a full RGBA frame */
83		6	ctx->inflated_size = avctx->width * avctx->height * 4;
84		6	ctx->inflated_buf = av_malloc(ctx->inflated_size);
85	✗✓	6	if (!ctx->inflated_buf)
86			return AVERROR(ENOMEM);
87
88		6	return 0;
89			}
90
91		13	static void sum_delta_flipped(uint8_t *dst, int dst_linesize,
92			const uint8_t *src, int src_linesize,
93			int bytewidth, int height)
94			{
95			int i;
96	✓✓	3493	for (; height > 0; height--) {
97		3480	const uint8_t src1 = &src[(height - 1) src_linesize];
98	✓✓	4073880	for (i = 0; i < bytewidth; i++)
99		4070400	dst[i] += src1[i];
100		3480	dst += dst_linesize;
101			}
102		13	}
103
104		21	static int screenpresso_decode_frame(AVCodecContext avctx, void data,
105			int got_frame, AVPacket avpkt)
106			{
107		21	ScreenpressoContext *ctx = avctx->priv_data;
108		21	AVFrame *frame = data;
109		21	uLongf length = ctx->inflated_size;
110			int keyframe, component_size, src_linesize;
111			int ret;
112
113			/* Size check */
114	✗✓	21	if (avpkt->size < 3) {
115			av_log(avctx, AV_LOG_ERROR, "Packet too small (%d)\n", avpkt->size);
116			return AVERROR_INVALIDDATA;
117			}
118
119			/* Compression level (4 bits) and keyframe information (1 bit) */
120		21	av_log(avctx, AV_LOG_DEBUG, "Compression level %d\n", avpkt->data[0] >> 4);
121		21	keyframe = avpkt->data[0] & 1;
122
123			/* Pixel size */
124		21	component_size = ((avpkt->data[1] >> 2) & 0x03) + 1;
125	✓✓✓✗	21	switch (component_size) {
126		10	case 2:
127		10	avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
128		10	break;
129		5	case 3:
130		5	avctx->pix_fmt = AV_PIX_FMT_BGR24;
131		5	break;
132		6	case 4:
133		6	avctx->pix_fmt = AV_PIX_FMT_BGR0;
134		6	break;
135			default:
136			av_log(avctx, AV_LOG_ERROR, "Invalid bits per pixel value (%d)\n",
137			component_size);
138			return AVERROR_INVALIDDATA;
139			}
140
141			/* Inflate the frame after the 2 byte header */
142		21	ret = uncompress(ctx->inflated_buf, &length,
143		21	avpkt->data + 2, avpkt->size - 2);
144	✓✓	21	if (ret) {
145		2	av_log(avctx, AV_LOG_ERROR, "Deflate error %d.\n", ret);
146		2	return AVERROR_UNKNOWN;
147			}
148
149		19	ret = ff_reget_buffer(avctx, ctx->current, 0);
150	✗✓	19	if (ret < 0)
151			return ret;
152
153			/* Codec has aligned strides */
154		19	src_linesize = FFALIGN(avctx->width * component_size, 4);
155
156			/* When a keyframe is found, copy it (flipped) */
157	✓✓	19	if (keyframe)
158		6	av_image_copy_plane(ctx->current->data[0] +
159		6	ctx->current->linesize[0] * (avctx->height - 1),
160		6	-1 * ctx->current->linesize[0],
161		6	ctx->inflated_buf, src_linesize,
162		6	avctx->width * component_size, avctx->height);
163			/* Otherwise sum the delta on top of the current frame */
164			else
165		13	sum_delta_flipped(ctx->current->data[0], ctx->current->linesize[0],
166		13	ctx->inflated_buf, src_linesize,
167		13	avctx->width * component_size, avctx->height);
168
169			/* Frame is ready to be output */
170		19	ret = av_frame_ref(frame, ctx->current);
171	✗✓	19	if (ret < 0)
172			return ret;
173
174			/* Usual properties */
175	✓✓	19	if (keyframe) {
176		6	frame->pict_type = AV_PICTURE_TYPE_I;
177		6	frame->key_frame = 1;
178			} else {
179		13	frame->pict_type = AV_PICTURE_TYPE_P;
180			}
181		19	*got_frame = 1;
182
183		19	return avpkt->size;
184			}
185
186			AVCodec ff_screenpresso_decoder = {
187			.name = "screenpresso",
188			.long_name = NULL_IF_CONFIG_SMALL("Screenpresso"),
189			.type = AVMEDIA_TYPE_VIDEO,
190			.id = AV_CODEC_ID_SCREENPRESSO,
191			.init = screenpresso_init,
192			.decode = screenpresso_decode_frame,
193			.close = screenpresso_close,
194			.priv_data_size = sizeof(ScreenpressoContext),
195			.capabilities = AV_CODEC_CAP_DR1,
196			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE \|
197			FF_CODEC_CAP_INIT_CLEANUP,
198			};