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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/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 "codec_internal.h" | ||
31 | #include "encode.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 | const 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 | *got_packet = 1; | |
176 | |||
177 | 13 | return 0; | |
178 | } | ||
179 | |||
180 | 1 | static av_cold int targa_encode_init(AVCodecContext *avctx) | |
181 | { | ||
182 |
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1 | if (avctx->width > 0xffff || avctx->height > 0xffff) { |
183 | ✗ | av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n"); | |
184 | ✗ | return AVERROR(EINVAL); | |
185 | } | ||
186 | |||
187 | 1 | return 0; | |
188 | } | ||
189 | |||
190 | #define OFFSET(x) offsetof(TargaContext, x) | ||
191 | #define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM | ||
192 | static const AVOption options[] = { | ||
193 | { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE }, | ||
194 | |||
195 | { NULL }, | ||
196 | }; | ||
197 | |||
198 | static const AVClass targa_class = { | ||
199 | .class_name = "targa", | ||
200 | .item_name = av_default_item_name, | ||
201 | .option = options, | ||
202 | .version = LIBAVUTIL_VERSION_INT, | ||
203 | }; | ||
204 | |||
205 | const FFCodec ff_targa_encoder = { | ||
206 | .p.name = "targa", | ||
207 | CODEC_LONG_NAME("Truevision Targa image"), | ||
208 | .p.type = AVMEDIA_TYPE_VIDEO, | ||
209 | .p.id = AV_CODEC_ID_TARGA, | ||
210 | .p.capabilities = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_ENCODER_REORDERED_OPAQUE, | ||
211 | .priv_data_size = sizeof(TargaContext), | ||
212 | .p.priv_class = &targa_class, | ||
213 | .init = targa_encode_init, | ||
214 | FF_CODEC_ENCODE_CB(targa_encode_frame), | ||
215 | .p.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 | }; | ||
220 |