| 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 | }; |