FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/targaenc.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 47 86 54.7%
Branches: 12 32 37.5%

Line Branch Exec Source
1 /*
2 * Targa (.tga) image encoder
3 * Copyright (c) 2007 Bobby Bingham
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 <string.h>
23
24 #include "libavutil/imgutils.h"
25 #include "libavutil/internal.h"
26 #include "libavutil/intreadwrite.h"
27 #include "libavutil/opt.h"
28 #include "libavutil/pixdesc.h"
29 #include "avcodec.h"
30 #include "encode.h"
31 #include "internal.h"
32 #include "rle.h"
33 #include "targa.h"
34
35 typedef struct TargaContext {
36 AVClass *class;
37
38 int rle;
39 } TargaContext;
40
41 /**
42 * RLE compress the image, with maximum size of out_size
43 * @param outbuf Output buffer
44 * @param out_size Maximum output size
45 * @param pic Image to compress
46 * @param bpp Bytes per pixel
47 * @param w Image width
48 * @param h Image height
49 * @return Size of output in bytes, or -1 if larger than out_size
50 */
51 13 static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
52 int bpp, int w, int h)
53 {
54 int y,ret;
55 uint8_t *out;
56
57 13 out = outbuf;
58
59
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3744 for(y = 0; y < h; y ++) {
60 3744 ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
61
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3744 if(ret == -1){
62 13 return -1;
63 }
64 3731 out+= ret;
65 3731 out_size -= ret;
66 }
67
68 return out - outbuf;
69 }
70
71 13 static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
72 {
73 13 int i, n = bpp * w;
74 13 uint8_t *out = outbuf;
75 13 uint8_t *ptr = pic->data[0];
76
77
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3757 for(i=0; i < h; i++) {
78 3744 memcpy(out, ptr, n);
79 3744 out += n;
80 3744 ptr += pic->linesize[0];
81 }
82
83 13 return out - outbuf;
84 }
85
86 13 static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
87 const AVFrame *p, int *got_packet)
88 {
89 13 TargaContext *s = avctx->priv_data;
90 13 int bpp, picsize, datasize = -1, ret, i;
91 uint8_t *out;
92
93 13 picsize = av_image_get_buffer_size(avctx->pix_fmt,
94 avctx->width, avctx->height, 1);
95
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13 if ((ret = ff_alloc_packet(avctx, pkt, picsize + 45)) < 0)
96 return ret;
97
98 /* zero out the header and only set applicable fields */
99 13 memset(pkt->data, 0, 12);
100 13 AV_WL16(pkt->data+12, avctx->width);
101 13 AV_WL16(pkt->data+14, avctx->height);
102 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
103
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13 pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
104
105 13 out = pkt->data + 18; /* skip past the header we write */
106
107 13 avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
108
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13 switch(avctx->pix_fmt) {
109 case AV_PIX_FMT_PAL8: {
110 int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
111 for (i = 0; i < 256; i++)
112 if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
113 pal_bpp = 32;
114 break;
115 }
116 pkt->data[1] = 1; /* palette present */
117 pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
118 pkt->data[6] = 1; /* palette contains 256 entries */
119 pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
120 pkt->data[16] = 8; /* bpp */
121 for (i = 0; i < 256; i++)
122 if (pal_bpp == 32) {
123 AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
124 } else {
125 AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
126 }
127 out += 32 * pal_bpp; /* skip past the palette we just output */
128 break;
129 }
130 case AV_PIX_FMT_GRAY8:
131 pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
132 avctx->bits_per_coded_sample = 0x28;
133 pkt->data[16] = 8; /* bpp */
134 break;
135 case AV_PIX_FMT_RGB555LE:
136 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
137 avctx->bits_per_coded_sample =
138 pkt->data[16] = 16; /* bpp */
139 break;
140 13 case AV_PIX_FMT_BGR24:
141 13 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
142 13 pkt->data[16] = 24; /* bpp */
143 13 break;
144 case AV_PIX_FMT_BGRA:
145 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
146 pkt->data[16] = 32; /* bpp */
147 break;
148 default:
149 av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
150 av_get_pix_fmt_name(avctx->pix_fmt));
151 return AVERROR(EINVAL);
152 }
153 13 bpp = pkt->data[16] >> 3;
154
155
156 /* try RLE compression */
157
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13 if (s->rle)
158 13 datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
159
160 /* if that worked well, mark the picture as RLE compressed */
161
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13 if(datasize >= 0)
162 pkt->data[2] |= TGA_RLE;
163
164 /* if RLE didn't make it smaller, go back to no compression */
165 13 else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
166
167 13 out += datasize;
168
169 /* The standard recommends including this section, even if we don't use
170 * any of the features it affords. TODO: take advantage of the pixel
171 * aspect ratio and encoder ID fields available? */
172 13 memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
173
174 13 pkt->size = out + 26 - pkt->data;
175 13 pkt->flags |= AV_PKT_FLAG_KEY;
176 13 *got_packet = 1;
177
178 13 return 0;
179 }
180
181 1 static av_cold int targa_encode_init(AVCodecContext *avctx)
182 {
183
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1 if (avctx->width > 0xffff || avctx->height > 0xffff) {
184 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
185 return AVERROR(EINVAL);
186 }
187
188 1 return 0;
189 }
190
191 #define OFFSET(x) offsetof(TargaContext, x)
192 #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
193 static const AVOption options[] = {
194 { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
195
196 { NULL },
197 };
198
199 static const AVClass targa_class = {
200 .class_name = "targa",
201 .item_name = av_default_item_name,
202 .option = options,
203 .version = LIBAVUTIL_VERSION_INT,
204 };
205
206 const AVCodec ff_targa_encoder = {
207 .name = "targa",
208 .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
209 .type = AVMEDIA_TYPE_VIDEO,
210 .id = AV_CODEC_ID_TARGA,
211 .priv_data_size = sizeof(TargaContext),
212 .priv_class = &targa_class,
213 .init = targa_encode_init,
214 .encode2 = targa_encode_frame,
215 .pix_fmts = (const enum AVPixelFormat[]){
216 AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
217 AV_PIX_FMT_NONE
218 },
219 .caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
220 };
221