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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/bethsoftvideo.c	Lines:	58	74	78.4 %
Date:	2019-11-18 18:00:01	Branches:	25	38	65.8 %


/*
 * Bethesda VID video decoder
 * Copyright (C) 2007 Nicholas Tung
 *
 * 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
 * @brief Bethesda Softworks VID Video Decoder
 * @author Nicholas Tung [ntung (at. ntung com] (2007-03)
 * @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
 * @see http://www.svatopluk.com/andux/docs/dfvid.html
 */

#include "libavutil/common.h"
#include "avcodec.h"
#include "bethsoftvideo.h"
#include "bytestream.h"
#include "internal.h"

typedef struct BethsoftvidContext {
    AVFrame *frame;
    GetByteContext g;
} BethsoftvidContext;

static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
{
    BethsoftvidContext *vid = avctx->priv_data;
    avctx->pix_fmt = AV_PIX_FMT_PAL8;

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

    return 0;
}

static int set_palette(BethsoftvidContext *ctx)
{
    uint32_t *palette = (uint32_t *)ctx->frame->data[1];
    int a;

    if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
        return AVERROR_INVALIDDATA;

    for(a = 0; a < 256; a++){
        palette[a] = 0xFFU << 24 | bytestream2_get_be24u(&ctx->g) * 4;
        palette[a] |= palette[a] >> 6 & 0x30303;
    }
    ctx->frame->palette_has_changed = 1;
    return 0;
}

static int bethsoftvid_decode_frame(AVCodecContext *avctx,
                              void *data, int *got_frame,
                              AVPacket *avpkt)
{
    BethsoftvidContext * vid = avctx->priv_data;
    char block_type;
    uint8_t * dst;
    uint8_t * frame_end;
    int remaining = avctx->width;          // number of bytes remaining on a line
    int wrap_to_next_line;
    int code, ret;
    int yoffset;

    if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
        return ret;
    wrap_to_next_line = vid->frame->linesize[0] - avctx->width;

    if (avpkt->side_data_elems > 0 &&
        avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
        bytestream2_init(&vid->g, avpkt->side_data[0].data,
                         avpkt->side_data[0].size);
        if ((ret = set_palette(vid)) < 0)
            return ret;
    }

    bytestream2_init(&vid->g, avpkt->data, avpkt->size);
    dst = vid->frame->data[0];
    frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;

    switch(block_type = bytestream2_get_byte(&vid->g)){
        case PALETTE_BLOCK: {
            *got_frame = 0;
            if ((ret = set_palette(vid)) < 0) {
                av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
                return ret;
            }
            return bytestream2_tell(&vid->g);
        }
        case VIDEO_YOFF_P_FRAME:
            yoffset = bytestream2_get_le16(&vid->g);
            if(yoffset >= avctx->height)
                return AVERROR_INVALIDDATA;
            dst += vid->frame->linesize[0] * yoffset;
        case VIDEO_P_FRAME:
        case VIDEO_I_FRAME:
            break;
        default:
            return AVERROR_INVALIDDATA;
    }

    // main code
    while((code = bytestream2_get_byte(&vid->g))){
        int length = code & 0x7f;

        // copy any bytes starting at the current position, and ending at the frame width
        while(length > remaining){
            if(code < 0x80)
                bytestream2_get_buffer(&vid->g, dst, remaining);
            else if(block_type == VIDEO_I_FRAME)
                memset(dst, bytestream2_peek_byte(&vid->g), remaining);
            length -= remaining;      // decrement the number of bytes to be copied
            dst += remaining + wrap_to_next_line;    // skip over extra bytes at end of frame
            remaining = avctx->width;
            if(dst == frame_end)
                goto end;
        }

        // copy any remaining bytes after / if line overflows
        if(code < 0x80)
            bytestream2_get_buffer(&vid->g, dst, length);
        else if(block_type == VIDEO_I_FRAME)
            memset(dst, bytestream2_get_byte(&vid->g), length);
        remaining -= length;
        dst += length;
    }
    end:

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

    *got_frame = 1;

    return avpkt->size;
}

static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
{
    BethsoftvidContext * vid = avctx->priv_data;
    av_frame_free(&vid->frame);
    return 0;
}

AVCodec ff_bethsoftvid_decoder = {
    .name           = "bethsoftvid",
    .long_name      = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_BETHSOFTVID,
    .priv_data_size = sizeof(BethsoftvidContext),
    .init           = bethsoftvid_decode_init,
    .close          = bethsoftvid_decode_end,
    .decode         = bethsoftvid_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* Bethesda VID video decoder
3			* Copyright (C) 2007 Nicholas Tung
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			* @brief Bethesda Softworks VID Video Decoder
25			* @author Nicholas Tung [ntung (at. ntung com] (2007-03)
26			* @see http://wiki.multimedia.cx/index.php?title=Bethsoft_VID
27			* @see http://www.svatopluk.com/andux/docs/dfvid.html
28			*/
29
30			#include "libavutil/common.h"
31			#include "avcodec.h"
32			#include "bethsoftvideo.h"
33			#include "bytestream.h"
34			#include "internal.h"
35
36			typedef struct BethsoftvidContext {
37			AVFrame *frame;
38			GetByteContext g;
39			} BethsoftvidContext;
40
41		2	static av_cold int bethsoftvid_decode_init(AVCodecContext *avctx)
42			{
43		2	BethsoftvidContext *vid = avctx->priv_data;
44		2	avctx->pix_fmt = AV_PIX_FMT_PAL8;
45
46		2	vid->frame = av_frame_alloc();
47	✗✓	2	if (!vid->frame)
48			return AVERROR(ENOMEM);
49
50		2	return 0;
51			}
52
53		1	static int set_palette(BethsoftvidContext *ctx)
54			{
55		1	uint32_t palette = (uint32_t )ctx->frame->data[1];
56			int a;
57
58	✗✓	1	if (bytestream2_get_bytes_left(&ctx->g) < 256*3)
59			return AVERROR_INVALIDDATA;
60
61	✓✓	257	for(a = 0; a < 256; a++){
62		256	palette[a] = 0xFFU << 24 \| bytestream2_get_be24u(&ctx->g) * 4;
63		256	palette[a] \|= palette[a] >> 6 & 0x30303;
64			}
65		1	ctx->frame->palette_has_changed = 1;
66		1	return 0;
67			}
68
69		76	static int bethsoftvid_decode_frame(AVCodecContext *avctx,
70			void data, int got_frame,
71			AVPacket *avpkt)
72			{
73		76	BethsoftvidContext * vid = avctx->priv_data;
74			char block_type;
75			uint8_t * dst;
76			uint8_t * frame_end;
77		76	int remaining = avctx->width; // number of bytes remaining on a line
78			int wrap_to_next_line;
79			int code, ret;
80			int yoffset;
81
82	✗✓	76	if ((ret = ff_reget_buffer(avctx, vid->frame, 0)) < 0)
83			return ret;
84		76	wrap_to_next_line = vid->frame->linesize[0] - avctx->width;
85
86	✓✓	76	if (avpkt->side_data_elems > 0 &&
87	✓✗	1	avpkt->side_data[0].type == AV_PKT_DATA_PALETTE) {
88		1	bytestream2_init(&vid->g, avpkt->side_data[0].data,
89		1	avpkt->side_data[0].size);
90	✗✓	1	if ((ret = set_palette(vid)) < 0)
91			return ret;
92			}
93
94		76	bytestream2_init(&vid->g, avpkt->data, avpkt->size);
95		76	dst = vid->frame->data[0];
96		76	frame_end = vid->frame->data[0] + vid->frame->linesize[0] * avctx->height;
97
98	✗✓✓✗	76	switch(block_type = bytestream2_get_byte(&vid->g)){
99			case PALETTE_BLOCK: {
100			*got_frame = 0;
101			if ((ret = set_palette(vid)) < 0) {
102			av_log(avctx, AV_LOG_ERROR, "error reading palette\n");
103			return ret;
104			}
105			return bytestream2_tell(&vid->g);
106			}
107		75	case VIDEO_YOFF_P_FRAME:
108		75	yoffset = bytestream2_get_le16(&vid->g);
109	✗✓	75	if(yoffset >= avctx->height)
110			return AVERROR_INVALIDDATA;
111		75	dst += vid->frame->linesize[0] * yoffset;
112		76	case VIDEO_P_FRAME:
113			case VIDEO_I_FRAME:
114		76	break;
115			default:
116			return AVERROR_INVALIDDATA;
117			}
118
119			// main code
120	✓✓	231333	while((code = bytestream2_get_byte(&vid->g))){
121		231257	int length = code & 0x7f;
122
123			// copy any bytes starting at the current position, and ending at the frame width
124	✓✓	244168	while(length > remaining){
125	✗✓	12911	if(code < 0x80)
126			bytestream2_get_buffer(&vid->g, dst, remaining);
127	✓✓	12911	else if(block_type == VIDEO_I_FRAME)
128		199	memset(dst, bytestream2_peek_byte(&vid->g), remaining);
129		12911	length -= remaining; // decrement the number of bytes to be copied
130		12911	dst += remaining + wrap_to_next_line; // skip over extra bytes at end of frame
131		12911	remaining = avctx->width;
132	✗✓	12911	if(dst == frame_end)
133			goto end;
134			}
135
136			// copy any remaining bytes after / if line overflows
137	✓✓	231257	if(code < 0x80)
138		112219	bytestream2_get_buffer(&vid->g, dst, length);
139	✓✓	119038	else if(block_type == VIDEO_I_FRAME)
140		504	memset(dst, bytestream2_get_byte(&vid->g), length);
141		231257	remaining -= length;
142		231257	dst += length;
143			}
144		76	end:
145
146	✗✓	76	if ((ret = av_frame_ref(data, vid->frame)) < 0)
147			return ret;
148
149		76	*got_frame = 1;
150
151		76	return avpkt->size;
152			}
153
154		2	static av_cold int bethsoftvid_decode_end(AVCodecContext *avctx)
155			{
156		2	BethsoftvidContext * vid = avctx->priv_data;
157		2	av_frame_free(&vid->frame);
158		2	return 0;
159			}
160
161			AVCodec ff_bethsoftvid_decoder = {
162			.name = "bethsoftvid",
163			.long_name = NULL_IF_CONFIG_SMALL("Bethesda VID video"),
164			.type = AVMEDIA_TYPE_VIDEO,
165			.id = AV_CODEC_ID_BETHSOFTVID,
166			.priv_data_size = sizeof(BethsoftvidContext),
167			.init = bethsoftvid_decode_init,
168			.close = bethsoftvid_decode_end,
169			.decode = bethsoftvid_decode_frame,
170			.capabilities = AV_CODEC_CAP_DR1,
171			.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
172			};