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221 lines
6.8 KiB
C
221 lines
6.8 KiB
C
/*
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* Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
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* Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
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*
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* This file is part of Libav.
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*
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* Libav 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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* Libav 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 Libav; 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 "sunrast.h"
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typedef struct SUNRASTContext {
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PutByteContext p;
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int depth; ///< depth of pixel
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int length; ///< length (bytes) of image
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int type; ///< type of file
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int maptype; ///< type of colormap
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int maplength; ///< length (bytes) of colormap
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int size;
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} SUNRASTContext;
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static void sunrast_image_write_header(AVCodecContext *avctx)
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{
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SUNRASTContext *s = avctx->priv_data;
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bytestream2_put_be32u(&s->p, RAS_MAGIC);
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bytestream2_put_be32u(&s->p, avctx->width);
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bytestream2_put_be32u(&s->p, avctx->height);
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bytestream2_put_be32u(&s->p, s->depth);
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bytestream2_put_be32u(&s->p, s->length);
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bytestream2_put_be32u(&s->p, s->type);
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bytestream2_put_be32u(&s->p, s->maptype);
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bytestream2_put_be32u(&s->p, s->maplength);
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}
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static void sunrast_image_write_image(AVCodecContext *avctx,
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const uint8_t *pixels,
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const uint32_t *palette_data,
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int linesize)
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{
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SUNRASTContext *s = avctx->priv_data;
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const uint8_t *ptr;
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int len, alen, x, y;
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if (s->maplength) { // palettized
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PutByteContext pb_r, pb_g;
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int len = s->maplength / 3;
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pb_r = s->p;
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bytestream2_skip_p(&s->p, len);
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pb_g = s->p;
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bytestream2_skip_p(&s->p, len);
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for (x = 0; x < len; x++) {
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uint32_t pixel = palette_data[x];
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bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
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bytestream2_put_byteu(&pb_g, (pixel >> 8) & 0xFF);
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bytestream2_put_byteu(&s->p, pixel & 0xFF);
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}
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}
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len = (s->depth * avctx->width + 7) >> 3;
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alen = len + (len & 1);
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ptr = pixels;
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if (s->type == RT_BYTE_ENCODED) {
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uint8_t value, value2;
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int run;
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ptr = pixels;
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#define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x]
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x = 0, y = 0;
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value2 = GET_VALUE;
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while (y < avctx->height) {
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run = 1;
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value = value2;
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x++;
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if (x >= alen) {
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x = 0;
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ptr += linesize, y++;
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}
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value2 = GET_VALUE;
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while (value2 == value && run < 256 && y < avctx->height) {
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x++;
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run++;
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if (x >= alen) {
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x = 0;
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ptr += linesize, y++;
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}
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value2 = GET_VALUE;
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}
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if (run > 2 || value == RLE_TRIGGER) {
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bytestream2_put_byteu(&s->p, RLE_TRIGGER);
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bytestream2_put_byteu(&s->p, run - 1);
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if (run > 1)
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bytestream2_put_byteu(&s->p, value);
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} else if (run == 1) {
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bytestream2_put_byteu(&s->p, value);
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} else
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bytestream2_put_be16u(&s->p, (value << 8) | value);
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}
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// update data length for header
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s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
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} else {
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for (y = 0; y < avctx->height; y++) {
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bytestream2_put_buffer(&s->p, ptr, len);
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if (len < alen)
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bytestream2_put_byteu(&s->p, 0);
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ptr += linesize;
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}
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}
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}
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static av_cold int sunrast_encode_init(AVCodecContext *avctx)
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{
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SUNRASTContext *s = avctx->priv_data;
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switch (avctx->coder_type) {
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case FF_CODER_TYPE_RLE:
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s->type = RT_BYTE_ENCODED;
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break;
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case FF_CODER_TYPE_RAW:
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s->type = RT_STANDARD;
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
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return AVERROR(EINVAL);
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}
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s->maptype = RMT_NONE;
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s->maplength = 0;
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switch (avctx->pix_fmt) {
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case AV_PIX_FMT_MONOWHITE:
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s->depth = 1;
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break;
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case AV_PIX_FMT_PAL8 :
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s->maptype = RMT_EQUAL_RGB;
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s->maplength = 3 * 256;
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case AV_PIX_FMT_GRAY8:
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s->depth = 8;
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break;
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case AV_PIX_FMT_BGR24:
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s->depth = 24;
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break;
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default:
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return AVERROR_BUG;
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}
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s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
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s->size = 32 + s->maplength +
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s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1);
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return 0;
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}
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static int sunrast_encode_frame(AVCodecContext *avctx, AVPacket *avpkt,
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const AVFrame *frame, int *got_packet_ptr)
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{
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SUNRASTContext *s = avctx->priv_data;
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int ret;
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if ((ret = ff_alloc_packet2(avctx, avpkt, s->size)) < 0)
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return ret;
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bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
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sunrast_image_write_header(avctx);
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sunrast_image_write_image(avctx, frame->data[0],
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(const uint32_t *)frame->data[1],
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frame->linesize[0]);
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// update data length in header after RLE
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if (s->type == RT_BYTE_ENCODED)
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AV_WB32(&avpkt->data[16], s->length);
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*got_packet_ptr = 1;
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avpkt->flags |= AV_PKT_FLAG_KEY;
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avpkt->size = bytestream2_tell_p(&s->p);
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return 0;
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}
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static const AVCodecDefault sunrast_defaults[] = {
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{ "coder", "rle" },
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{ NULL },
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};
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AVCodec ff_sunrast_encoder = {
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.name = "sunrast",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_SUNRAST,
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.priv_data_size = sizeof(SUNRASTContext),
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.init = sunrast_encode_init,
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.encode2 = sunrast_encode_frame,
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.defaults = sunrast_defaults,
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.pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24,
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AV_PIX_FMT_PAL8,
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AV_PIX_FMT_GRAY8,
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AV_PIX_FMT_MONOWHITE,
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AV_PIX_FMT_NONE },
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.long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
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};
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