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1 | /* |
2 | * SGI image encoder | |
3 | * Todd Kirby <doubleshot@pacbell.net> | |
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 "avcodec.h" | |
23 | #include "bytestream.h" | |
24 | #include "internal.h" | |
25 | #include "sgi.h" | |
26 | #include "rle.h" | |
27 | ||
28 | #define SGI_SINGLE_CHAN 2 | |
29 | #define SGI_MULTI_CHAN 3 | |
30 | ||
31 | static av_cold int encode_init(AVCodecContext *avctx) | |
32 | { | |
33 | if (avctx->width > 65535 || avctx->height > 65535) { | |
34 | av_log(avctx, AV_LOG_ERROR, | |
35 | "Unsupported resolution %dx%d.\n", avctx->width, avctx->height); | |
36 | av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n"); | |
37 | return AVERROR_INVALIDDATA; | |
38 | } | |
39 | ||
40 | avctx->coded_frame = av_frame_alloc(); | |
41 | if (!avctx->coded_frame) | |
42 | return AVERROR(ENOMEM); | |
43 | ||
44 | return 0; | |
45 | } | |
46 | ||
47 | static int encode_frame(AVCodecContext *avctx, AVPacket *pkt, | |
48 | const AVFrame *frame, int *got_packet) | |
49 | { | |
50 | const AVFrame * const p = frame; | |
51 | uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf; | |
52 | int x, y, z, length, tablesize, ret; | |
53 | unsigned int width, height, depth, dimension; | |
54 | unsigned int bytes_per_channel, pixmax, put_be; | |
55 | unsigned char *end_buf; | |
56 | ||
57 | avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; | |
58 | avctx->coded_frame->key_frame = 1; | |
59 | ||
60 | width = avctx->width; | |
61 | height = avctx->height; | |
62 | bytes_per_channel = 1; | |
63 | pixmax = 0xFF; | |
64 | put_be = HAVE_BIGENDIAN; | |
65 | ||
66 | switch (avctx->pix_fmt) { | |
67 | case AV_PIX_FMT_GRAY8: | |
68 | dimension = SGI_SINGLE_CHAN; | |
69 | depth = SGI_GRAYSCALE; | |
70 | break; | |
71 | case AV_PIX_FMT_RGB24: | |
72 | dimension = SGI_MULTI_CHAN; | |
73 | depth = SGI_RGB; | |
74 | break; | |
75 | case AV_PIX_FMT_RGBA: | |
76 | dimension = SGI_MULTI_CHAN; | |
77 | depth = SGI_RGBA; | |
78 | break; | |
79 | case AV_PIX_FMT_GRAY16LE: | |
80 | put_be = !HAVE_BIGENDIAN; | |
81 | case AV_PIX_FMT_GRAY16BE: | |
82 | avctx->coder_type = FF_CODER_TYPE_RAW; | |
83 | bytes_per_channel = 2; | |
84 | pixmax = 0xFFFF; | |
85 | dimension = SGI_SINGLE_CHAN; | |
86 | depth = SGI_GRAYSCALE; | |
87 | break; | |
88 | case AV_PIX_FMT_RGB48LE: | |
89 | put_be = !HAVE_BIGENDIAN; | |
90 | case AV_PIX_FMT_RGB48BE: | |
91 | avctx->coder_type = FF_CODER_TYPE_RAW; | |
92 | bytes_per_channel = 2; | |
93 | pixmax = 0xFFFF; | |
94 | dimension = SGI_MULTI_CHAN; | |
95 | depth = SGI_RGB; | |
96 | break; | |
97 | case AV_PIX_FMT_RGBA64LE: | |
98 | put_be = !HAVE_BIGENDIAN; | |
99 | case AV_PIX_FMT_RGBA64BE: | |
100 | avctx->coder_type = FF_CODER_TYPE_RAW; | |
101 | bytes_per_channel = 2; | |
102 | pixmax = 0xFFFF; | |
103 | dimension = SGI_MULTI_CHAN; | |
104 | depth = SGI_RGBA; | |
105 | break; | |
106 | default: | |
107 | return AVERROR_INVALIDDATA; | |
108 | } | |
109 | ||
110 | tablesize = depth * height * 4; | |
111 | length = SGI_HEADER_SIZE; | |
112 | if (avctx->coder_type == FF_CODER_TYPE_RAW) | |
113 | length += depth * height * width; | |
114 | else // assume ff_rl_encode() produces at most 2x size of input | |
115 | length += tablesize * 2 + depth * height * (2 * width + 1); | |
116 | ||
117 | if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length)) < 0) | |
118 | return ret; | |
119 | buf = pkt->data; | |
120 | end_buf = pkt->data + pkt->size; | |
121 | ||
122 | /* Encode header. */ | |
123 | bytestream_put_be16(&buf, SGI_MAGIC); | |
124 | bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/ | |
125 | bytestream_put_byte(&buf, bytes_per_channel); | |
126 | bytestream_put_be16(&buf, dimension); | |
127 | bytestream_put_be16(&buf, width); | |
128 | bytestream_put_be16(&buf, height); | |
129 | bytestream_put_be16(&buf, depth); | |
130 | ||
131 | bytestream_put_be32(&buf, 0L); /* pixmin */ | |
132 | bytestream_put_be32(&buf, pixmax); | |
133 | bytestream_put_be32(&buf, 0L); /* dummy */ | |
134 | ||
135 | /* name */ | |
136 | memset(buf, 0, SGI_HEADER_SIZE); | |
137 | buf += 80; | |
138 | ||
139 | /* colormap */ | |
140 | bytestream_put_be32(&buf, 0L); | |
141 | ||
142 | /* The rest of the 512 byte header is unused. */ | |
143 | buf += 404; | |
144 | offsettab = buf; | |
145 | ||
146 | if (avctx->coder_type != FF_CODER_TYPE_RAW) { | |
147 | /* Skip RLE offset table. */ | |
148 | buf += tablesize; | |
149 | lengthtab = buf; | |
150 | ||
151 | /* Skip RLE length table. */ | |
152 | buf += tablesize; | |
153 | ||
154 | /* Make an intermediate consecutive buffer. */ | |
155 | if (!(encode_buf = av_malloc(width))) | |
156 | return -1; | |
157 | ||
158 | for (z = 0; z < depth; z++) { | |
159 | in_buf = p->data[0] + p->linesize[0] * (height - 1) + z; | |
160 | ||
161 | for (y = 0; y < height; y++) { | |
162 | bytestream_put_be32(&offsettab, buf - pkt->data); | |
163 | ||
164 | for (x = 0; x < width; x++) | |
165 | encode_buf[x] = in_buf[depth * x]; | |
166 | ||
167 | if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) { | |
168 | av_free(encode_buf); | |
169 | return -1; | |
170 | } | |
171 | ||
172 | buf += length; | |
173 | bytestream_put_byte(&buf, 0); | |
174 | bytestream_put_be32(&lengthtab, length + 1); | |
175 | in_buf -= p->linesize[0]; | |
176 | } | |
177 | } | |
178 | ||
179 | av_free(encode_buf); | |
180 | } else { | |
181 | for (z = 0; z < depth; z++) { | |
182 | in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel; | |
183 | ||
184 | for (y = 0; y < height; y++) { | |
185 | for (x = 0; x < width * depth; x += depth) | |
186 | if (bytes_per_channel == 1) { | |
187 | bytestream_put_byte(&buf, in_buf[x]); | |
188 | } else { | |
189 | if (put_be) { | |
190 | bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]); | |
191 | } else { | |
192 | bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]); | |
193 | } | |
194 | } | |
195 | ||
196 | in_buf -= p->linesize[0]; | |
197 | } | |
198 | } | |
199 | } | |
200 | ||
201 | /* total length */ | |
202 | pkt->size = buf - pkt->data; | |
203 | pkt->flags |= AV_PKT_FLAG_KEY; | |
204 | *got_packet = 1; | |
205 | ||
206 | return 0; | |
207 | } | |
208 | ||
209 | static av_cold int encode_close(AVCodecContext *avctx) | |
210 | { | |
211 | av_frame_free(&avctx->coded_frame); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | AVCodec ff_sgi_encoder = { | |
216 | .name = "sgi", | |
217 | .long_name = NULL_IF_CONFIG_SMALL("SGI image"), | |
218 | .type = AVMEDIA_TYPE_VIDEO, | |
219 | .id = AV_CODEC_ID_SGI, | |
220 | .init = encode_init, | |
221 | .encode2 = encode_frame, | |
222 | .close = encode_close, | |
223 | .pix_fmts = (const enum AVPixelFormat[]) { | |
224 | AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA, | |
225 | AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE, | |
226 | AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE, | |
227 | AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8, | |
228 | AV_PIX_FMT_NONE | |
229 | }, | |
230 | }; |