/* * 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 "avcodec.h" #include "bytestream.h" #include "sgi.h" #include "rle.h" #define SGI_SINGLE_CHAN 2 #define SGI_MULTI_CHAN 3 typedef struct SgiContext { AVFrame picture; } SgiContext; static av_cold int encode_init(AVCodecContext *avctx) { SgiContext *s = avctx->priv_data; avcodec_get_frame_defaults(&s->picture); avctx->coded_frame = &s->picture; return 0; } static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data) { SgiContext *s = avctx->priv_data; AVFrame * const p = &s->picture; uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf; int x, y, z, length, tablesize; unsigned int width, height, depth, dimension; unsigned char *orig_buf = buf, *end_buf = buf + buf_size; *p = *(AVFrame*)data; p->pict_type = FF_I_TYPE; p->key_frame = 1; width = avctx->width; height = avctx->height; switch (avctx->pix_fmt) { case PIX_FMT_GRAY8: dimension = SGI_SINGLE_CHAN; depth = SGI_GRAYSCALE; break; case PIX_FMT_RGB24: dimension = SGI_MULTI_CHAN; depth = SGI_RGB; break; case PIX_FMT_RGBA: dimension = SGI_MULTI_CHAN; depth = SGI_RGBA; break; default: return AVERROR_INVALIDDATA; } tablesize = depth * height * 4; length = tablesize * 2 + SGI_HEADER_SIZE; if (buf_size < length) { av_log(avctx, AV_LOG_ERROR, "buf_size too small(need %d, got %d)\n", length, buf_size); return -1; } /* Encode header. */ bytestream_put_be16(&buf, SGI_MAGIC); bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/ bytestream_put_byte(&buf, 1); /* bytes_per_channel */ bytestream_put_be16(&buf, dimension); bytestream_put_be16(&buf, width); bytestream_put_be16(&buf, height); bytestream_put_be16(&buf, depth); /* The rest are constant in this implementation. */ bytestream_put_be32(&buf, 0L); /* pixmin */ bytestream_put_be32(&buf, 255L); /* pixmax */ bytestream_put_be32(&buf, 0L); /* dummy */ /* name */ memset(buf, 0, SGI_HEADER_SIZE); buf += 80; /* colormap */ bytestream_put_be32(&buf, 0L); /* The rest of the 512 byte header is unused. */ buf += 404; offsettab = buf; if (avctx->coder_type != FF_CODER_TYPE_RAW) { /* Skip RLE offset table. */ buf += tablesize; lengthtab = buf; /* Skip RLE length table. */ buf += tablesize; /* Make an intermediate consecutive buffer. */ if (!(encode_buf = av_malloc(width))) return -1; for (z = 0; z < depth; z++) { in_buf = p->data[0] + p->linesize[0] * (height - 1) + z; for (y = 0; y < height; y++) { bytestream_put_be32(&offsettab, buf - orig_buf); for (x = 0; x < width; x++) encode_buf[x] = in_buf[depth * x]; if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) { av_free(encode_buf); return -1; } buf += length; bytestream_put_byte(&buf, 0); bytestream_put_be32(&lengthtab, length + 1); 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; for (y = 0; y < height; y++) { for (x = 0; x < width * depth; x += depth) bytestream_put_byte(&buf, in_buf[x]); in_buf -= p->linesize[0]; } } } /* total length */ return buf - orig_buf; } AVCodec sgi_encoder = { "sgi", AVMEDIA_TYPE_VIDEO, CODEC_ID_SGI, sizeof(SgiContext), encode_init, encode_frame, NULL, .pix_fmts= (const enum PixelFormat[]){PIX_FMT_RGB24, PIX_FMT_RGBA, PIX_FMT_GRAY8, PIX_FMT_NONE}, .long_name= NULL_IF_CONFIG_SMALL("SGI image"), };