summaryrefslogtreecommitdiff
path: root/libavcodec/sgienc.c
blob: 13756f16088b2a1b8c9753cc3dc64a041f78fe90 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
/*
 * SGI image encoder
 * Todd Kirby <doubleshot@pacbell.net>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "libavutil/opt.h"

#include "avcodec.h"
#include "bytestream.h"
#include "internal.h"
#include "sgi.h"
#include "rle.h"

#define SGI_SINGLE_CHAN 2
#define SGI_MULTI_CHAN 3

typedef struct SgiContext {
    AVClass *class;

    int rle;
} SgiContext;

static av_cold int encode_init(AVCodecContext *avctx)
{
    if (avctx->width > 65535 || avctx->height > 65535) {
        av_log(avctx, AV_LOG_ERROR,
               "Unsupported resolution %dx%d.\n", avctx->width, avctx->height);
        av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
        return AVERROR_INVALIDDATA;
    }

    return 0;
}

static int sgi_rle_encode(PutByteContext *pbc, const uint8_t *src,
                          int w, int bpp)
{
    int val, count, x, start = bytestream2_tell_p(pbc);
    void (*bytestream2_put)(PutByteContext *, unsigned int);

    if (bpp == 1)
        bytestream2_put = bytestream2_put_byte;
    else
        bytestream2_put = bytestream2_put_be16;

    for (x = 0; x < w; x += count) {
        /* see if we can encode the next set of pixels with RLE */
        count = ff_rle_count_pixels(src, w - x, bpp, 1);
        if (count > 1) {
            if (bytestream2_get_bytes_left_p(pbc) < bpp * 2)
                return AVERROR_INVALIDDATA;

            val = bpp == 1 ? *src : AV_RB16(src);
            bytestream2_put(pbc, count);
            bytestream2_put(pbc, val);
        } else {
            int i;
            /* fall back on uncompressed */
            count = ff_rle_count_pixels(src, w - x, bpp, 0);
            if (bytestream2_get_bytes_left_p(pbc) < bpp * (count + 1))
                return AVERROR_INVALIDDATA;

            bytestream2_put(pbc, count + 0x80);
            for (i = 0; i < count; i++) {
                val = bpp == 1 ? src[i] : AV_RB16(src + i * bpp);
                bytestream2_put(pbc, val);
            }
        }

        src += count * bpp;
    }

    return bytestream2_tell_p(pbc) - start;
}

static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
                        const AVFrame *frame, int *got_packet)
{
    SgiContext *s = avctx->priv_data;
    const AVFrame * const p = frame;
    PutByteContext pbc;
    uint8_t *in_buf, *encode_buf;
    int x, y, z, length, tablesize, ret, i;
    unsigned int width, height, depth, dimension;
    unsigned int bytes_per_channel, pixmax, put_be;

#if FF_API_CODED_FRAME
FF_DISABLE_DEPRECATION_WARNINGS
    avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
    avctx->coded_frame->key_frame = 1;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

#if FF_API_CODER_TYPE
FF_DISABLE_DEPRECATION_WARNINGS
    if (avctx->coder_type == FF_CODER_TYPE_RAW)
        s->rle = 0;
FF_ENABLE_DEPRECATION_WARNINGS
#endif

    width  = avctx->width;
    height = avctx->height;
    bytes_per_channel = 1;
    pixmax = 0xFF;
    put_be = HAVE_BIGENDIAN;

    switch (avctx->pix_fmt) {
    case AV_PIX_FMT_GRAY8:
        dimension = SGI_SINGLE_CHAN;
        depth     = SGI_GRAYSCALE;
        break;
    case AV_PIX_FMT_RGB24:
        dimension = SGI_MULTI_CHAN;
        depth     = SGI_RGB;
        break;
    case AV_PIX_FMT_RGBA:
        dimension = SGI_MULTI_CHAN;
        depth     = SGI_RGBA;
        break;
    case AV_PIX_FMT_GRAY16LE:
        put_be = !HAVE_BIGENDIAN;
    case AV_PIX_FMT_GRAY16BE:
        bytes_per_channel = 2;
        pixmax = 0xFFFF;
        dimension = SGI_SINGLE_CHAN;
        depth     = SGI_GRAYSCALE;
        break;
    case AV_PIX_FMT_RGB48LE:
        put_be = !HAVE_BIGENDIAN;
    case AV_PIX_FMT_RGB48BE:
        bytes_per_channel = 2;
        pixmax = 0xFFFF;
        dimension = SGI_MULTI_CHAN;
        depth     = SGI_RGB;
        break;
    case AV_PIX_FMT_RGBA64LE:
        put_be = !HAVE_BIGENDIAN;
    case AV_PIX_FMT_RGBA64BE:
        bytes_per_channel = 2;
        pixmax = 0xFFFF;
        dimension = SGI_MULTI_CHAN;
        depth     = SGI_RGBA;
        break;
    default:
        return AVERROR_INVALIDDATA;
    }

    tablesize = depth * height * 4;
    length = SGI_HEADER_SIZE;
    if (!s->rle)
        length += depth * height * width;
    else // assume sgi_rle_encode() produces at most 2x size of input
        length += tablesize * 2 + depth * height * (2 * width + 1);

    if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length, 0)) < 0)
        return ret;

    bytestream2_init_writer(&pbc, pkt->data, pkt->size);

    /* Encode header. */
    bytestream2_put_be16(&pbc, SGI_MAGIC);
    bytestream2_put_byte(&pbc, s->rle); /* RLE 1 - VERBATIM 0 */
    bytestream2_put_byte(&pbc, bytes_per_channel);
    bytestream2_put_be16(&pbc, dimension);
    bytestream2_put_be16(&pbc, width);
    bytestream2_put_be16(&pbc, height);
    bytestream2_put_be16(&pbc, depth);

    bytestream2_put_be32(&pbc, 0L); /* pixmin */
    bytestream2_put_be32(&pbc, pixmax);
    bytestream2_put_be32(&pbc, 0L); /* dummy */

    /* name */
    for (i = 0; i < 80; i++)
        bytestream2_put_byte(&pbc, 0L);

    /* colormap */
    bytestream2_put_be32(&pbc, 0L);

    /* The rest of the 512 byte header is unused. */
    for (i = 0; i < 404; i++)
        bytestream2_put_byte(&pbc, 0L);

    if (s->rle) {
        PutByteContext taboff_pcb, tablen_pcb;

        /* Skip RLE offset table. */
        bytestream2_init_writer(&taboff_pcb, pbc.buffer, tablesize);
        bytestream2_skip_p(&pbc, tablesize);

        /* Skip RLE length table. */
        bytestream2_init_writer(&tablen_pcb, pbc.buffer, tablesize);
        bytestream2_skip_p(&pbc, tablesize);

        /* Make an intermediate consecutive buffer. */
        if (!(encode_buf = av_malloc(width * bytes_per_channel)))
            return AVERROR(ENOMEM);

        for (z = 0; z < depth; z++) {
            in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;

            for (y = 0; y < height; y++) {
                bytestream2_put_be32(&taboff_pcb, bytestream2_tell_p(&pbc));

                for (x = 0; x < width * bytes_per_channel; x += bytes_per_channel)
                    encode_buf[x] = in_buf[depth * x];

                length = sgi_rle_encode(&pbc, encode_buf, width,
                                        bytes_per_channel);
                if (length < 1) {
                    av_free(encode_buf);
                    return AVERROR_INVALIDDATA;
                }

                bytestream2_put_be32(&tablen_pcb, length);
                in_buf -= p->linesize[0];
            }
        }

        av_free(encode_buf);
    } else {
        for (z = 0; z < depth; z++) {
            in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;

            for (y = 0; y < height; y++) {
                for (x = 0; x < width * depth; x += depth)
                    if (bytes_per_channel == 1)
                        bytestream2_put_byte(&pbc, in_buf[x]);
                    else
                        if (put_be)
                            bytestream2_put_be16(&pbc, ((uint16_t *)in_buf)[x]);
                        else
                            bytestream2_put_le16(&pbc, ((uint16_t *)in_buf)[x]);

                in_buf -= p->linesize[0];
            }
        }
    }

    /* total length */
    pkt->size   = bytestream2_tell_p(&pbc);
    pkt->flags |= AV_PKT_FLAG_KEY;
    *got_packet = 1;

    return 0;
}

#define OFFSET(x) offsetof(SgiContext, x)
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
static const AVOption options[] = {
    { "rle", "Use run-length compression", OFFSET(rle), AV_OPT_TYPE_INT, { .i64 = 1 }, 0, 1, VE },

    { NULL },
};

static const AVClass sgi_class = {
    .class_name = "sgi",
    .item_name  = av_default_item_name,
    .option     = options,
    .version    = LIBAVUTIL_VERSION_INT,
};

AVCodec ff_sgi_encoder = {
    .name      = "sgi",
    .long_name = NULL_IF_CONFIG_SMALL("SGI image"),
    .type      = AVMEDIA_TYPE_VIDEO,
    .id        = AV_CODEC_ID_SGI,
    .priv_data_size = sizeof(SgiContext),
    .priv_class = &sgi_class,
    .init      = encode_init,
    .encode2   = encode_frame,
    .pix_fmts  = (const enum AVPixelFormat[]) {
        AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
        AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
        AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
        AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE, AV_PIX_FMT_GRAY8,
        AV_PIX_FMT_NONE
    },
};