1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
|
/*
* Targa (.tga) image encoder
* Copyright (c) 2007 Bobby Bingham
*
* 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 <string.h>
#include "libavutil/imgutils.h"
#include "libavutil/internal.h"
#include "libavutil/intreadwrite.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "avcodec.h"
#include "internal.h"
#include "rle.h"
#include "targa.h"
typedef struct TargaContext {
AVClass *class;
int rle;
} TargaContext;
/**
* RLE compress the image, with maximum size of out_size
* @param outbuf Output buffer
* @param out_size Maximum output size
* @param pic Image to compress
* @param bpp Bytes per pixel
* @param w Image width
* @param h Image height
* @return Size of output in bytes, or -1 if larger than out_size
*/
static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
int bpp, int w, int h)
{
int y,ret;
uint8_t *out;
out = outbuf;
for(y = 0; y < h; y ++) {
ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
if(ret == -1){
return -1;
}
out+= ret;
out_size -= ret;
}
return out - outbuf;
}
static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
{
int i, n = bpp * w;
uint8_t *out = outbuf;
uint8_t *ptr = pic->data[0];
for(i=0; i < h; i++) {
memcpy(out, ptr, n);
out += n;
ptr += pic->linesize[0];
}
return out - outbuf;
}
static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
const AVFrame *p, int *got_packet)
{
TargaContext *s = avctx->priv_data;
int bpp, picsize, datasize = -1, ret, i;
uint8_t *out;
picsize = av_image_get_buffer_size(avctx->pix_fmt,
avctx->width, avctx->height, 1);
if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45, 0)) < 0)
return ret;
/* zero out the header and only set applicable fields */
memset(pkt->data, 0, 12);
AV_WL16(pkt->data+12, avctx->width);
AV_WL16(pkt->data+14, avctx->height);
/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
out = pkt->data + 18; /* skip past the header we write */
avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
switch(avctx->pix_fmt) {
case AV_PIX_FMT_PAL8: {
int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
for (i = 0; i < 256; i++)
if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
pal_bpp = 32;
break;
}
pkt->data[1] = 1; /* palette present */
pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
pkt->data[6] = 1; /* palette contains 256 entries */
pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
pkt->data[16] = 8; /* bpp */
for (i = 0; i < 256; i++)
if (pal_bpp == 32) {
AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
} else {
AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
}
out += 32 * pal_bpp; /* skip past the palette we just output */
break;
}
case AV_PIX_FMT_GRAY8:
pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
avctx->bits_per_coded_sample = 0x28;
pkt->data[16] = 8; /* bpp */
break;
case AV_PIX_FMT_RGB555LE:
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
avctx->bits_per_coded_sample =
pkt->data[16] = 16; /* bpp */
break;
case AV_PIX_FMT_BGR24:
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
pkt->data[16] = 24; /* bpp */
break;
case AV_PIX_FMT_BGRA:
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
pkt->data[16] = 32; /* bpp */
break;
default:
av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
av_get_pix_fmt_name(avctx->pix_fmt));
return AVERROR(EINVAL);
}
bpp = pkt->data[16] >> 3;
/* try RLE compression */
if (s->rle)
datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
/* if that worked well, mark the picture as RLE compressed */
if(datasize >= 0)
pkt->data[2] |= TGA_RLE;
/* if RLE didn't make it smaller, go back to no compression */
else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
out += datasize;
/* The standard recommends including this section, even if we don't use
* any of the features it affords. TODO: take advantage of the pixel
* aspect ratio and encoder ID fields available? */
memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
pkt->size = out + 26 - pkt->data;
pkt->flags |= AV_PKT_FLAG_KEY;
*got_packet = 1;
return 0;
}
static av_cold int targa_encode_init(AVCodecContext *avctx)
{
if (avctx->width > 0xffff || avctx->height > 0xffff) {
av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
return AVERROR(EINVAL);
}
return 0;
}
#define OFFSET(x) offsetof(TargaContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
{ "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },
{ NULL },
};
static const AVClass targa_class = {
.class_name = "targa",
.item_name = av_default_item_name,
.option = options,
.version = LIBAVUTIL_VERSION_INT,
};
const AVCodec ff_targa_encoder = {
.name = "targa",
.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
.type = AVMEDIA_TYPE_VIDEO,
.id = AV_CODEC_ID_TARGA,
.priv_data_size = sizeof(TargaContext),
.priv_class = &targa_class,
.init = targa_encode_init,
.encode2 = targa_encode_frame,
.pix_fmts = (const enum AVPixelFormat[]){
AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
AV_PIX_FMT_NONE
},
.caps_internal = FF_CODEC_CAP_INIT_THREADSAFE,
};
|
