Imported Debian version 2.5.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / targaenc.c
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/internal.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/pixdesc.h"
27 #include "avcodec.h"
28 #include "internal.h"
29 #include "rle.h"
30 #include "targa.h"
31
32 /**
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
41 */
42 static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
43 int bpp, int w, int h)
44 {
45 int y,ret;
46 uint8_t *out;
47
48 out = outbuf;
49
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);
52 if(ret == -1){
53 return -1;
54 }
55 out+= ret;
56 out_size -= ret;
57 }
58
59 return out - outbuf;
60 }
61
62 static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
63 {
64 int i, n = bpp * w;
65 uint8_t *out = outbuf;
66 uint8_t *ptr = pic->data[0];
67
68 for(i=0; i < h; i++) {
69 memcpy(out, ptr, n);
70 out += n;
71 ptr += pic->linesize[0];
72 }
73
74 return out - outbuf;
75 }
76
77 static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
78 const AVFrame *p, int *got_packet)
79 {
80 int bpp, picsize, datasize = -1, ret, i;
81 uint8_t *out;
82
83 if(avctx->width > 0xffff || avctx->height > 0xffff) {
84 av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
85 return AVERROR(EINVAL);
86 }
87 picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
88 if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
89 return ret;
90
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);
97
98 out = pkt->data + 18; /* skip past the header we write */
99
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) {
106 pal_bpp = 32;
107 break;
108 }
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++)
115 if (pal_bpp == 32) {
116 AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
117 } else {
118 AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
119 }
120 out += 32 * pal_bpp; /* skip past the palette we just output */
121 break;
122 }
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 */
127 break;
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 */
132 break;
133 case AV_PIX_FMT_BGR24:
134 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
135 pkt->data[16] = 24; /* bpp */
136 break;
137 case AV_PIX_FMT_BGRA:
138 pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
139 pkt->data[16] = 32; /* bpp */
140 break;
141 default:
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);
145 }
146 bpp = pkt->data[16] >> 3;
147
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);
151
152 /* if that worked well, mark the picture as RLE compressed */
153 if(datasize >= 0)
154 pkt->data[2] |= TGA_RLE;
155
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);
158
159 out += datasize;
160
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);
165
166 pkt->size = out + 26 - pkt->data;
167 pkt->flags |= AV_PKT_FLAG_KEY;
168 *got_packet = 1;
169
170 return 0;
171 }
172
173 static av_cold int targa_encode_init(AVCodecContext *avctx)
174 {
175 avctx->coded_frame = av_frame_alloc();
176 if (!avctx->coded_frame)
177 return AVERROR(ENOMEM);
178
179 avctx->coded_frame->key_frame = 1;
180 avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
181
182 return 0;
183 }
184
185 static av_cold int targa_encode_close(AVCodecContext *avctx)
186 {
187 av_frame_free(&avctx->coded_frame);
188 return 0;
189 }
190
191 AVCodec ff_targa_encoder = {
192 .name = "targa",
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,
201 AV_PIX_FMT_NONE
202 },
203 };