217 lines
6.6 KiB
C
217 lines
6.6 KiB
C
/*
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* SGI image encoder
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* Todd Kirby <doubleshot@pacbell.net>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "sgi.h"
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#include "rle.h"
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#define SGI_SINGLE_CHAN 2
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#define SGI_MULTI_CHAN 3
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static av_cold int encode_init(AVCodecContext *avctx)
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{
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if (avctx->width > 65535 || avctx->height > 65535) {
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av_log(avctx, AV_LOG_ERROR, "SGI does not support resolutions above 65535x65535\n");
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return -1;
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}
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return 0;
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}
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static int encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *frame, int *got_packet)
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{
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AVFrame * const p = (AVFrame *)frame;
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uint8_t *offsettab, *lengthtab, *in_buf, *encode_buf, *buf;
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int x, y, z, length, tablesize, ret;
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unsigned int width, height, depth, dimension, bytes_per_channel, pixmax, put_be;
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unsigned char *end_buf;
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p->pict_type = AV_PICTURE_TYPE_I;
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p->key_frame = 1;
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width = avctx->width;
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height = avctx->height;
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bytes_per_channel = 1;
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pixmax = 0xFF;
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put_be = HAVE_BIGENDIAN;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_GRAY8:
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dimension = SGI_SINGLE_CHAN;
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depth = SGI_GRAYSCALE;
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break;
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case AV_PIX_FMT_RGB24:
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGB;
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break;
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case AV_PIX_FMT_RGBA:
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGBA;
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break;
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case AV_PIX_FMT_GRAY16LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_GRAY16BE:
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avctx->coder_type = FF_CODER_TYPE_RAW;
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_SINGLE_CHAN;
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depth = SGI_GRAYSCALE;
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break;
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case AV_PIX_FMT_RGB48LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_RGB48BE:
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avctx->coder_type = FF_CODER_TYPE_RAW;
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGB;
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break;
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case AV_PIX_FMT_RGBA64LE:
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put_be = !HAVE_BIGENDIAN;
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case AV_PIX_FMT_RGBA64BE:
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avctx->coder_type = FF_CODER_TYPE_RAW;
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bytes_per_channel = 2;
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pixmax = 0xFFFF;
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dimension = SGI_MULTI_CHAN;
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depth = SGI_RGBA;
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break;
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default:
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return AVERROR_INVALIDDATA;
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}
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tablesize = depth * height * 4;
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length = SGI_HEADER_SIZE;
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if (avctx->coder_type == FF_CODER_TYPE_RAW)
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length += depth * height * width;
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else // assume ff_rl_encode() produces at most 2x size of input
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length += tablesize * 2 + depth * height * (2 * width + 1);
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if ((ret = ff_alloc_packet2(avctx, pkt, bytes_per_channel * length)) < 0)
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return ret;
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buf = pkt->data;
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end_buf = pkt->data + pkt->size;
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/* Encode header. */
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bytestream_put_be16(&buf, SGI_MAGIC);
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bytestream_put_byte(&buf, avctx->coder_type != FF_CODER_TYPE_RAW); /* RLE 1 - VERBATIM 0*/
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bytestream_put_byte(&buf, bytes_per_channel);
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bytestream_put_be16(&buf, dimension);
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bytestream_put_be16(&buf, width);
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bytestream_put_be16(&buf, height);
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bytestream_put_be16(&buf, depth);
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bytestream_put_be32(&buf, 0L); /* pixmin */
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bytestream_put_be32(&buf, pixmax);
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bytestream_put_be32(&buf, 0L); /* dummy */
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/* name */
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memset(buf, 0, SGI_HEADER_SIZE);
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buf += 80;
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/* colormap */
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bytestream_put_be32(&buf, 0L);
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/* The rest of the 512 byte header is unused. */
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buf += 404;
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offsettab = buf;
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if (avctx->coder_type != FF_CODER_TYPE_RAW) {
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/* Skip RLE offset table. */
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buf += tablesize;
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lengthtab = buf;
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/* Skip RLE length table. */
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buf += tablesize;
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/* Make an intermediate consecutive buffer. */
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if (!(encode_buf = av_malloc(width)))
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return -1;
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for (z = 0; z < depth; z++) {
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in_buf = p->data[0] + p->linesize[0] * (height - 1) + z;
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for (y = 0; y < height; y++) {
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bytestream_put_be32(&offsettab, buf - pkt->data);
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for (x = 0; x < width; x++)
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encode_buf[x] = in_buf[depth * x];
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if ((length = ff_rle_encode(buf, end_buf - buf - 1, encode_buf, 1, width, 0, 0, 0x80, 0)) < 1) {
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av_free(encode_buf);
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return -1;
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}
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buf += length;
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bytestream_put_byte(&buf, 0);
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bytestream_put_be32(&lengthtab, length + 1);
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in_buf -= p->linesize[0];
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}
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}
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av_free(encode_buf);
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} else {
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for (z = 0; z < depth; z++) {
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in_buf = p->data[0] + p->linesize[0] * (height - 1) + z * bytes_per_channel;
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for (y = 0; y < height; y++) {
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for (x = 0; x < width * depth; x += depth)
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if (bytes_per_channel == 1) {
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bytestream_put_byte(&buf, in_buf[x]);
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} else {
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if (put_be) {
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bytestream_put_be16(&buf, ((uint16_t *)in_buf)[x]);
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} else {
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bytestream_put_le16(&buf, ((uint16_t *)in_buf)[x]);
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}
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}
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in_buf -= p->linesize[0];
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}
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}
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}
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/* total length */
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pkt->size = buf - pkt->data;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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AVCodec ff_sgi_encoder = {
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.name = "sgi",
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.long_name = NULL_IF_CONFIG_SMALL("SGI image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SGI,
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.init = encode_init,
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.encode2 = encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_RGB24, AV_PIX_FMT_RGBA,
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AV_PIX_FMT_RGB48LE, AV_PIX_FMT_RGB48BE,
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AV_PIX_FMT_RGBA64LE, AV_PIX_FMT_RGBA64BE,
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AV_PIX_FMT_GRAY16LE, AV_PIX_FMT_GRAY16BE,
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AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE
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},
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};
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