2 * Targa (.tga) image encoder
3 * Copyright (c) 2007 Bobby Bingham
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavutil/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/pixdesc.h"
33 * RLE compress the image, with maximum size of out_size
34 * @param outbuf Output buffer
35 * @param out_size Maximum output size
36 * @param pic Image to compress
37 * @param bpp Bytes per pixel
38 * @param w Image width
39 * @param h Image height
40 * @return Size of output in bytes, or -1 if larger than out_size
42 static int targa_encode_rle(uint8_t *outbuf
, int out_size
, const AVFrame
*pic
,
43 int bpp
, int w
, int h
)
50 for(y
= 0; y
< h
; y
++) {
51 ret
= ff_rle_encode(out
, out_size
, pic
->data
[0] + pic
->linesize
[0] * y
, bpp
, w
, 0x7f, 0, -1, 0);
62 static int targa_encode_normal(uint8_t *outbuf
, const AVFrame
*pic
, int bpp
, int w
, int h
)
65 uint8_t *out
= outbuf
;
66 uint8_t *ptr
= pic
->data
[0];
68 for(i
=0; i
< h
; i
++) {
71 ptr
+= pic
->linesize
[0];
77 static int targa_encode_frame(AVCodecContext
*avctx
, AVPacket
*pkt
,
78 const AVFrame
*p
, int *got_packet
)
80 int bpp
, picsize
, datasize
= -1, ret
, i
;
83 if(avctx
->width
> 0xffff || avctx
->height
> 0xffff) {
84 av_log(avctx
, AV_LOG_ERROR
, "image dimensions too large\n");
85 return AVERROR(EINVAL
);
87 picsize
= avpicture_get_size(avctx
->pix_fmt
, avctx
->width
, avctx
->height
);
88 if ((ret
= ff_alloc_packet2(avctx
, pkt
, picsize
+ 45)) < 0)
91 /* zero out the header and only set applicable fields */
92 memset(pkt
->data
, 0, 12);
93 AV_WL16(pkt
->data
+12, avctx
->width
);
94 AV_WL16(pkt
->data
+14, avctx
->height
);
95 /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
96 pkt
->data
[17] = 0x20 | (avctx
->pix_fmt
== AV_PIX_FMT_BGRA
? 8 : 0);
98 out
= pkt
->data
+ 18; /* skip past the header we write */
100 avctx
->bits_per_coded_sample
= av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx
->pix_fmt
));
101 switch(avctx
->pix_fmt
) {
102 case AV_PIX_FMT_PAL8
: {
103 int pal_bpp
= 24; /* Only write 32bit palette if there is transparency information */
104 for (i
= 0; i
< 256; i
++)
105 if (AV_RN32(p
->data
[1] + 4 * i
) >> 24 != 0xFF) {
109 pkt
->data
[1] = 1; /* palette present */
110 pkt
->data
[2] = TGA_PAL
; /* uncompressed palettised image */
111 pkt
->data
[6] = 1; /* palette contains 256 entries */
112 pkt
->data
[7] = pal_bpp
; /* palette contains pal_bpp bit entries */
113 pkt
->data
[16] = 8; /* bpp */
114 for (i
= 0; i
< 256; i
++)
116 AV_WL32(pkt
->data
+ 18 + 4 * i
, *(uint32_t *)(p
->data
[1] + i
* 4));
118 AV_WL24(pkt
->data
+ 18 + 3 * i
, *(uint32_t *)(p
->data
[1] + i
* 4));
120 out
+= 32 * pal_bpp
; /* skip past the palette we just output */
123 case AV_PIX_FMT_GRAY8
:
124 pkt
->data
[2] = TGA_BW
; /* uncompressed grayscale image */
125 avctx
->bits_per_coded_sample
= 0x28;
126 pkt
->data
[16] = 8; /* bpp */
128 case AV_PIX_FMT_RGB555LE
:
129 pkt
->data
[2] = TGA_RGB
; /* uncompressed true-color image */
130 avctx
->bits_per_coded_sample
=
131 pkt
->data
[16] = 16; /* bpp */
133 case AV_PIX_FMT_BGR24
:
134 pkt
->data
[2] = TGA_RGB
; /* uncompressed true-color image */
135 pkt
->data
[16] = 24; /* bpp */
137 case AV_PIX_FMT_BGRA
:
138 pkt
->data
[2] = TGA_RGB
; /* uncompressed true-color image */
139 pkt
->data
[16] = 32; /* bpp */
142 av_log(avctx
, AV_LOG_ERROR
, "Pixel format '%s' not supported.\n",
143 av_get_pix_fmt_name(avctx
->pix_fmt
));
144 return AVERROR(EINVAL
);
146 bpp
= pkt
->data
[16] >> 3;
148 /* try RLE compression */
149 if (avctx
->coder_type
!= FF_CODER_TYPE_RAW
)
150 datasize
= targa_encode_rle(out
, picsize
, p
, bpp
, avctx
->width
, avctx
->height
);
152 /* if that worked well, mark the picture as RLE compressed */
154 pkt
->data
[2] |= TGA_RLE
;
156 /* if RLE didn't make it smaller, go back to no compression */
157 else datasize
= targa_encode_normal(out
, p
, bpp
, avctx
->width
, avctx
->height
);
161 /* The standard recommends including this section, even if we don't use
162 * any of the features it affords. TODO: take advantage of the pixel
163 * aspect ratio and encoder ID fields available? */
164 memcpy(out
, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
166 pkt
->size
= out
+ 26 - pkt
->data
;
167 pkt
->flags
|= AV_PKT_FLAG_KEY
;
173 static av_cold
int targa_encode_init(AVCodecContext
*avctx
)
175 avctx
->coded_frame
= av_frame_alloc();
176 if (!avctx
->coded_frame
)
177 return AVERROR(ENOMEM
);
179 avctx
->coded_frame
->key_frame
= 1;
180 avctx
->coded_frame
->pict_type
= AV_PICTURE_TYPE_I
;
185 static av_cold
int targa_encode_close(AVCodecContext
*avctx
)
187 av_frame_free(&avctx
->coded_frame
);
191 AVCodec ff_targa_encoder
= {
193 .long_name
= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
194 .type
= AVMEDIA_TYPE_VIDEO
,
195 .id
= AV_CODEC_ID_TARGA
,
196 .init
= targa_encode_init
,
197 .close
= targa_encode_close
,
198 .encode2
= targa_encode_frame
,
199 .pix_fmts
= (const enum AVPixelFormat
[]){
200 AV_PIX_FMT_BGR24
, AV_PIX_FMT_BGRA
, AV_PIX_FMT_RGB555LE
, AV_PIX_FMT_GRAY8
, AV_PIX_FMT_PAL8
,