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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 | }; |