FFmpeg coverage

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 "libavutil/intreadwrite.h"
26			#include "avcodec.h"
27			#include "codec_internal.h"
28			#include "decode.h"
29
30
31			#define FRAME_HEADER_SIZE 64
32			#define MAGIC_0 0x19 /**< First header byte */
33			#define MAGIC_1 0x68 /**< Second header byte */
34			#define SUBSAMPLE_420 0
35			#define SUBSAMPLE_422 1
36			#define YUVORDER_YUYV 0
37			#define YUVORDER_UYVY 1
38			#define NOT_COMPRESSED 0
39			#define COMPRESSED 1
40			#define NO_DECIMATION 0
41			#define DECIMATION_ENAB 1
42			#define EOL 0xfd /**< End Of Line marker */
43			#define EOI 0xff /**< End Of Image marker */
44
45
46			typedef struct {
47			AVFrame *frame;
48			} CpiaContext;
49
50
51		✗	static int cpia_decode_frame(AVCodecContext *avctx, AVFrame *rframe,
52			int *got_frame, AVPacket* avpkt)
53			{
54		✗	CpiaContext* const cpia = avctx->priv_data;
55			int i,j,ret;
56
57		✗	const uint8_t *const header = avpkt->data;
58			const uint8_t *src;
59			int src_size;
60			uint16_t linelength;
61			uint8_t skip;
62
63		✗	AVFrame *frame = cpia->frame;
64			uint8_t *y, *u, *v, *y_end, *u_end, *v_end;
65
66			// Check header
67		✗	if ( avpkt->size < FRAME_HEADER_SIZE + avctx->height * 3
68		✗	|| header[0] != MAGIC_0 || header[1] != MAGIC_1
69		✗	|| (header[17] != SUBSAMPLE_420 && header[17] != SUBSAMPLE_422)
70		✗	|| (header[18] != YUVORDER_YUYV && header[18] != YUVORDER_UYVY)
71		✗	|| (header[28] != NOT_COMPRESSED && header[28] != COMPRESSED)
72		✗	|| (header[29] != NO_DECIMATION && header[29] != DECIMATION_ENAB)
73			) {
74		✗	av_log(avctx, AV_LOG_ERROR, "Invalid header!\n");
75		✗	return AVERROR_INVALIDDATA;
76			}
77
78			// currently unsupported properties
79		✗	if (header[17] == SUBSAMPLE_422) {
80		✗	avpriv_report_missing_feature(avctx, "4:2:2 subsampling");
81		✗	return AVERROR_PATCHWELCOME;
82			}
83		✗	if (header[18] == YUVORDER_UYVY) {
84		✗	avpriv_report_missing_feature(avctx, "YUV byte order UYVY");
85		✗	return AVERROR_PATCHWELCOME;
86			}
87		✗	if (header[29] == DECIMATION_ENAB) {
88		✗	avpriv_report_missing_feature(avctx, "Decimation");
89		✗	return AVERROR_PATCHWELCOME;
90			}
91
92		✗	src = header + FRAME_HEADER_SIZE;
93		✗	src_size = avpkt->size - FRAME_HEADER_SIZE;
94
95		✗	if (header[28] == NOT_COMPRESSED) {
96		✗	frame->pict_type = AV_PICTURE_TYPE_I;
97		✗	frame->flags |= AV_FRAME_FLAG_KEY;
98			} else {
99		✗	frame->pict_type = AV_PICTURE_TYPE_P;
100		✗	frame->flags &= ~AV_FRAME_FLAG_KEY;
101			}
102
103			// Get buffer filled with previous frame
104		✗	if ((ret = ff_reget_buffer(avctx, frame, 0)) < 0)
105		✗	return ret;
106
107
108		✗	for ( i = 0;
109		✗	i < frame->height;
110		✗	i++, src += linelength, src_size -= linelength
111			) {
112			// Read line length, two byte little endian
113		✗	linelength = AV_RL16(src);
114		✗	src += 2;
115		✗	src_size -= 2;
116
117		✗	if (src_size < linelength) {
118		✗	frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
119		✗	av_log(avctx, AV_LOG_WARNING, "Frame ended unexpectedly!\n");
120		✗	break;
121			}
122		✗	if (src[linelength - 1] != EOL) {
123		✗	frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
124		✗	av_log(avctx, AV_LOG_WARNING, "Wrong line length %d or line not terminated properly (found 0x%02x)!\n", linelength, src[linelength - 1]);
125		✗	break;
126			}
127
128			/* Update the data pointers. Y data is on every line.
129			* U and V data on every second line
130			*/
131		✗	y = &frame->data[0][i * frame->linesize[0]];
132		✗	u = &frame->data[1][(i >> 1) * frame->linesize[1]];
133		✗	v = &frame->data[2][(i >> 1) * frame->linesize[2]];
134		✗	y_end = y + frame->linesize[0] - 1;
135		✗	u_end = u + frame->linesize[1] - 1;
136		✗	v_end = v + frame->linesize[2] - 1;
137
138		✗	if ((i & 1) && header[17] == SUBSAMPLE_420) {
139			/* We are on an odd line and 420 subsample is used.
140			* On this line only Y values are specified, one per pixel.
141			*/
142		✗	for (j = 0; j < linelength - 1; j++) {
143		✗	if (y > y_end) {
144		✗	frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
145		✗	av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
146		✗	break;
147			}
148		✗	if ((src[j] & 1) && header[28] == COMPRESSED) {
149			/* It seems that odd lines are always uncompressed, but
150			* we do it according to specification anyways.
151			*/
152		✗	skip = src[j] >> 1;
153		✗	y += skip;
154			} else {
155		✗	*(y++) = src[j];
156			}
157			}
158		✗	} else if (header[17] == SUBSAMPLE_420) {
159			/* We are on an even line and 420 subsample is used.
160			* On this line each pair of pixels is described by four bytes.
161			*/
162		✗	for (j = 0; j < linelength - 4; ) {
163		✗	if (y + 1 > y_end || u > u_end || v > v_end) {
164		✗	frame->decode_error_flags = FF_DECODE_ERROR_INVALID_BITSTREAM;
165		✗	av_log(avctx, AV_LOG_WARNING, "Decoded data exceeded linesize!\n");
166		✗	break;
167			}
168		✗	if ((src[j] & 1) && header[28] == COMPRESSED) {
169			// Skip amount of pixels and move forward one byte
170		✗	skip = src[j] >> 1;
171		✗	y += skip;
172		✗	u += skip >> 1;
173		✗	v += skip >> 1;
174		✗	j++;
175			} else {
176			// Set image data as specified and move forward 4 bytes
177		✗	*(y++) = src[j];
178		✗	*(u++) = src[j+1];
179		✗	*(y++) = src[j+2];
180		✗	*(v++) = src[j+3];
181		✗	j += 4;
182			}
183			}
184			}
185			}
186
187		✗	*got_frame = 1;
188		✗	if ((ret = av_frame_ref(rframe, cpia->frame)) < 0)
189		✗	return ret;
190
191		✗	return avpkt->size;
192			}
193
194		✗	static av_cold int cpia_decode_init(AVCodecContext *avctx)
195			{
196		✗	CpiaContext *s = avctx->priv_data;
197
198			// output pixel format
199		✗	avctx->pix_fmt = AV_PIX_FMT_YUV420P;
200
201		✗	s->frame = av_frame_alloc();
202		✗	if (!s->frame)
203		✗	return AVERROR(ENOMEM);
204
205		✗	return 0;
206			}
207
208		✗	static av_cold int cpia_decode_end(AVCodecContext *avctx)
209			{
210		✗	CpiaContext *s = avctx->priv_data;
211
212		✗	av_frame_free(&s->frame);
213
214		✗	return 0;
215			}
216
217			const FFCodec ff_cpia_decoder = {
218			.p.name = "cpia",
219			CODEC_LONG_NAME("CPiA video format"),
220			.p.type = AVMEDIA_TYPE_VIDEO,
221			.p.id = AV_CODEC_ID_CPIA,
222			.priv_data_size = sizeof(CpiaContext),
223			.init = cpia_decode_init,
224			.close = cpia_decode_end,
225			FF_CODEC_DECODE_CB(cpia_decode_frame),
226			.p.capabilities = AV_CODEC_CAP_DR1,
227			};
228