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GCC Code Coverage Report

Directory:	../../../ffmpeg/		Exec	Total	Coverage
File:	src/libavcodec/cpia.c	Lines:	0	94	0.0 %
Date:	2020-01-27 20:17:04	Branches:	0	72	0.0 %


/*
 * CPiA video decoder.
 * Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com>
 *
 * This decoder is based on the LGPL code available at
 * https://v4l4j.googlecode.com/svn/v4l4j/trunk/libvideo/libv4lconvert/cpia1.c
 *
 * 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 "internal.h"


#define FRAME_HEADER_SIZE 64
#define MAGIC_0         0x19    /**< First header byte */
#define MAGIC_1         0x68    /**< Second header byte */
#define SUBSAMPLE_420      0
#define SUBSAMPLE_422      1
#define YUVORDER_YUYV      0
#define YUVORDER_UYVY      1
#define NOT_COMPRESSED     0
#define COMPRESSED         1
#define NO_DECIMATION      0
#define DECIMATION_ENAB    1
#define EOL             0xfd    /**< End Of Line marker */
#define EOI             0xff    /**< End Of Image marker */


typedef struct {
    AVFrame *frame;
} CpiaContext;


static int cpia_decode_frame(AVCodecContext *avctx,
                             void *data, int *got_frame, AVPacket* avpkt)
{
    CpiaContext* const cpia = avctx->priv_data;
    int i,j,ret;

    uint8_t* const header = avpkt->data;
    uint8_t* src;
    int src_size;
    uint16_t linelength;
    uint8_t skip;

    AVFrame *frame = cpia->frame;
    uint8_t *y, *u, *v, *y_end, *u_end, *v_end;

    // Check header
    if ( avpkt->size < FRAME_HEADER_SIZE + avctx->height * 3
      || header[0] != MAGIC_0 || header[1] != MAGIC_1
      || (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422)
      || (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY)
      || (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED)
      || (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB)
    ) {
        av_log(avctx, AV_LOG_ERROR, "Invalid header!\n");
        return AVERROR_INVALIDDATA;
    }

    // currently unsupported properties
    if (header[17] == SUBSAMPLE_422) {
        avpriv_report_missing_feature(avctx, "4:2:2 subsampling");
        return AVERROR_PATCHWELCOME;
    }
    if (header[18] == YUVORDER_UYVY) {
        avpriv_report_missing_feature(avctx, "YUV byte order UYVY");
        return AVERROR_PATCHWELCOME;
    }
    if (header[29] == DECIMATION_ENAB) {
        avpriv_report_missing_feature(avctx, "Decimation");
        return AVERROR_PATCHWELCOME;
    }

    src = header + FRAME_HEADER_SIZE;
    src_size = avpkt->size - FRAME_HEADER_SIZE;

    if (header[28] == NOT_COMPRESSED) {
        frame->pict_type = AV_PICTURE_TYPE_I;
        frame->key_frame = 1;
    } else {
        frame->pict_type = AV_PICTURE_TYPE_P;
        frame->key_frame = 0;
    }

    // Get buffer filled with previous frame
    if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
        return ret;


    for ( i = 0;
          i < frame->height;
          i++, src += linelength, src_size -= linelength
    ) {
        // Read line length, two byte little endian
        linelength = AV_RL16(src);
        src += 2;

        if (src_size < linelength) {
            frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
            av_log(avctx, AV_LOG_WARNING, "Frame ended unexpectedly!\n");
            break;
        }
        if (src[linelength - 1] != EOL) {
            frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
            av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]);
            break;
        }

        /* Update the data pointers. Y data is on every line.
         * U and V data on every second line
         */
        y = &frame->data[0][i * frame->linesize[0]];
        u = &frame->data[1][(i >> 1) * frame->linesize[1]];
        v = &frame->data[2][(i >> 1) * frame->linesize[2]];
        y_end = y + frame->linesize[0] - 1;
        u_end = u + frame->linesize[1] - 1;
        v_end = v + frame->linesize[2] - 1;

        if ((i & 1) && header[17] == SUBSAMPLE_420) {
            /* We are on an odd line and 420 subsample is used.
             * On this line only Y values are specified, one per pixel.
             */
            for (j = 0; j < linelength - 1; j++) {
                if (y > y_end) {
                    frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
                    av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
                    break;
                }
                if ((src[j] & 1) && header[28] == COMPRESSED) {
                    /* It seems that odd lines are always uncompressed, but
                     * we do it according to specification anyways.
                     */
                    skip = src[j] >> 1;
                    y += skip;
                } else {
                    *(y++) = src[j];
                }
            }
        } else if (header[17] == SUBSAMPLE_420) {
            /* We are on an even line and 420 subsample is used.
             * On this line each pair of pixels is described by four bytes.
             */
            for (j = 0; j < linelength - 4; ) {
                if (y + 1 > y_end || u > u_end || v > v_end) {
                    frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
                    av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
                    break;
                }
                if ((src[j] & 1) && header[28] == COMPRESSED) {
                    // Skip amount of pixels and move forward one byte
                    skip = src[j] >> 1;
                    y += skip;
                    u += skip >> 1;
                    v += skip >> 1;
                    j++;
                } else {
                    // Set image data as specified and move forward 4 bytes
                    *(y++) = src[j];
                    *(u++) = src[j+1];
                    *(y++) = src[j+2];
                    *(v++) = src[j+3];
                    j += 4;
                }
            }
        }
    }

    *got_frame = 1;
    if ((ret = av_frame_ref(data, cpia->frame)) < 0)
        return ret;

    return avpkt->size;
}

static av_cold int cpia_decode_init(AVCodecContext *avctx)
{
    CpiaContext *s = avctx->priv_data;

    // output pixel format
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;

    /* The default timebase set by the v4l2 demuxer leads to probing which is buggy.
     * Set some reasonable time_base to skip this.
     */
    if (avctx->time_base.num == 1 && avctx->time_base.den == 1000000) {
        avctx->time_base.num = 1;
        avctx->time_base.den = 60;
    }

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

    return 0;
}

static av_cold int cpia_decode_end(AVCodecContext *avctx)
{
    CpiaContext *s = avctx->priv_data;

    av_frame_free(&s->frame);

    return 0;
}

AVCodec ff_cpia_decoder = {
    .name           = "cpia",
    .long_name      = NULL_IF_CONFIG_SMALL("CPiA video format"),
    .type           = AVMEDIA_TYPE_VIDEO,
    .id             = AV_CODEC_ID_CPIA,
    .priv_data_size = sizeof(CpiaContext),
    .init           = cpia_decode_init,
    .close          = cpia_decode_end,
    .decode         = cpia_decode_frame,
    .capabilities   = AV_CODEC_CAP_DR1,
};


Generated by: GCOVR (Version 4.1)

Line	Branch	Exec	Source
1			/*
2			* CPiA video decoder.
3			* Copyright (c) 2010 Hans de Goede <hdegoede@redhat.com>
4			*
5			* This decoder is based on the LGPL code available at
6			* https://v4l4j.googlecode.com/svn/v4l4j/trunk/libvideo/libv4lconvert/cpia1.c
7			*
8			* This file is part of FFmpeg.
9			*
10			* FFmpeg is free software; you can redistribute it and/or
11			* modify it under the terms of the GNU Lesser General Public
12			* License as published by the Free Software Foundation; either
13			* version 2.1 of the License, or (at your option) any later version.
14			*
15			* FFmpeg is distributed in the hope that it will be useful,
16			* but WITHOUT ANY WARRANTY; without even the implied warranty of
17			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18			* Lesser General Public License for more details.
19			*
20			* You should have received a copy of the GNU Lesser General Public
21			* License along with FFmpeg; if not, write to the Free Software
22			* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23			*/
24
25			#include "avcodec.h"
26			#include "get_bits.h"
27			#include "internal.h"
28
29
30			#define FRAME_HEADER_SIZE 64
31			#define MAGIC_0 0x19 /*< First header byte /
32			#define MAGIC_1 0x68 /*< Second header byte /
33			#define SUBSAMPLE_420 0
34			#define SUBSAMPLE_422 1
35			#define YUVORDER_YUYV 0
36			#define YUVORDER_UYVY 1
37			#define NOT_COMPRESSED 0
38			#define COMPRESSED 1
39			#define NO_DECIMATION 0
40			#define DECIMATION_ENAB 1
41			#define EOL 0xfd /*< End Of Line marker /
42			#define EOI 0xff /*< End Of Image marker /
43
44
45			typedef struct {
46			AVFrame *frame;
47			} CpiaContext;
48
49
50			static int cpia_decode_frame(AVCodecContext *avctx,
51			void data, int got_frame, AVPacket* avpkt)
52			{
53			CpiaContext* const cpia = avctx->priv_data;
54			int i,j,ret;
55
56			uint8_t* const header = avpkt->data;
57			uint8_t* src;
58			int src_size;
59			uint16_t linelength;
60			uint8_t skip;
61
62			AVFrame *frame = cpia->frame;
63			uint8_t y, u, v, y_end, u_end, v_end;
64
65			// Check header
66			if ( avpkt->size < FRAME_HEADER_SIZE + avctx->height * 3
67			\|\| header[0] != MAGIC_0 \|\| header[1] != MAGIC_1
68			\|\| (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422)
69			\|\| (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY)
70			\|\| (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED)
71			\|\| (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB)
72			) {
73			av_log(avctx, AV_LOG_ERROR, "Invalid header!\n");
74			return AVERROR_INVALIDDATA;
75			}
76
77			// currently unsupported properties
78			if (header[17] == SUBSAMPLE_422) {
79			avpriv_report_missing_feature(avctx, "4:2:2 subsampling");
80			return AVERROR_PATCHWELCOME;
81			}
82			if (header[18] == YUVORDER_UYVY) {
83			avpriv_report_missing_feature(avctx, "YUV byte order UYVY");
84			return AVERROR_PATCHWELCOME;
85			}
86			if (header[29] == DECIMATION_ENAB) {
87			avpriv_report_missing_feature(avctx, "Decimation");
88			return AVERROR_PATCHWELCOME;
89			}
90
91			src = header + FRAME_HEADER_SIZE;
92			src_size = avpkt->size - FRAME_HEADER_SIZE;
93
94			if (header[28] == NOT_COMPRESSED) {
95			frame->pict_type = AV_PICTURE_TYPE_I;
96			frame->key_frame = 1;
97			} else {
98			frame->pict_type = AV_PICTURE_TYPE_P;
99			frame->key_frame = 0;
100			}
101
102			// Get buffer filled with previous frame
103			if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
104			return ret;
105
106
107			for ( i = 0;
108			i < frame->height;
109			i++, src += linelength, src_size -= linelength
110			) {
111			// Read line length, two byte little endian
112			linelength = AV_RL16(src);
113			src += 2;
114
115			if (src_size < linelength) {
116			frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
117			av_log(avctx, AV_LOG_WARNING, "Frame ended unexpectedly!\n");
118			break;
119			}
120			if (src[linelength - 1] != EOL) {
121			frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
122			av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]);
123			break;
124			}
125
126			/* Update the data pointers. Y data is on every line.
127			* U and V data on every second line
128			*/
129			y = &frame->data[0][i * frame->linesize[0]];
130			u = &frame->data[1][(i >> 1) * frame->linesize[1]];
131			v = &frame->data[2][(i >> 1) * frame->linesize[2]];
132			y_end = y + frame->linesize[0] - 1;
133			u_end = u + frame->linesize[1] - 1;
134			v_end = v + frame->linesize[2] - 1;
135
136			if ((i & 1) && header[17] == SUBSAMPLE_420) {
137			/* We are on an odd line and 420 subsample is used.
138			* On this line only Y values are specified, one per pixel.
139			*/
140			for (j = 0; j < linelength - 1; j++) {
141			if (y > y_end) {
142			frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
143			av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
144			break;
145			}
146			if ((src[j] & 1) && header[28] == COMPRESSED) {
147			/* It seems that odd lines are always uncompressed, but
148			* we do it according to specification anyways.
149			*/
150			skip = src[j] >> 1;
151			y += skip;
152			} else {
153			*(y++) = src[j];
154			}
155			}
156			} else if (header[17] == SUBSAMPLE_420) {
157			/* We are on an even line and 420 subsample is used.
158			* On this line each pair of pixels is described by four bytes.
159			*/
160			for (j = 0; j < linelength - 4; ) {
161			if (y + 1 > y_end \|\| u > u_end \|\| v > v_end) {
162			frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
163			av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
164			break;
165			}
166			if ((src[j] & 1) && header[28] == COMPRESSED) {
167			// Skip amount of pixels and move forward one byte
168			skip = src[j] >> 1;
169			y += skip;
170			u += skip >> 1;
171			v += skip >> 1;
172			j++;
173			} else {
174			// Set image data as specified and move forward 4 bytes
175			*(y++) = src[j];
176			*(u++) = src[j+1];
177			*(y++) = src[j+2];
178			*(v++) = src[j+3];
179			j += 4;
180			}
181			}
182			}
183			}
184
185			*got_frame = 1;
186			if ((ret = av_frame_ref(data, cpia->frame)) < 0)
187			return ret;
188
189			return avpkt->size;
190			}
191
192			static av_cold int cpia_decode_init(AVCodecContext *avctx)
193			{
194			CpiaContext *s = avctx->priv_data;
195
196			// output pixel format
197			avctx->pix_fmt = AV_PIX_FMT_YUV420P;
198
199			/* The default timebase set by the v4l2 demuxer leads to probing which is buggy.
200			* Set some reasonable time_base to skip this.
201			*/
202			if (avctx->time_base.num == 1 && avctx->time_base.den == 1000000) {
203			avctx->time_base.num = 1;
204			avctx->time_base.den = 60;
205			}
206
207			s->frame = av_frame_alloc();
208			if (!s->frame)
209			return AVERROR(ENOMEM);
210
211			return 0;
212			}
213
214			static av_cold int cpia_decode_end(AVCodecContext *avctx)
215			{
216			CpiaContext *s = avctx->priv_data;
217
218			av_frame_free(&s->frame);
219
220			return 0;
221			}
222
223			AVCodec ff_cpia_decoder = {
224			.name = "cpia",
225			.long_name = NULL_IF_CONFIG_SMALL("CPiA video format"),
226			.type = AVMEDIA_TYPE_VIDEO,
227			.id = AV_CODEC_ID_CPIA,
228			.priv_data_size = sizeof(CpiaContext),
229			.init = cpia_decode_init,
230			.close = cpia_decode_end,
231			.decode = cpia_decode_frame,
232			.capabilities = AV_CODEC_CAP_DR1,
233			};