From d7840529b6aaaa24426025781e5fcde673108d39 Mon Sep 17 00:00:00 2001 From: Aneesh Dogra Date: Fri, 17 Feb 2012 02:38:51 +0530 Subject: avcodec: add a Sun Rasterfile encoder Signed-off-by: Justin Ruggles --- libavcodec/sunrastenc.c | 225 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 225 insertions(+) create mode 100644 libavcodec/sunrastenc.c (limited to 'libavcodec/sunrastenc.c') diff --git a/libavcodec/sunrastenc.c b/libavcodec/sunrastenc.c new file mode 100644 index 0000000000..21d6fc47a0 --- /dev/null +++ b/libavcodec/sunrastenc.c @@ -0,0 +1,225 @@ +/* + * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder + * Copyright (c) 2012 Aneesh Dogra (lionaneesh) + * + * This file is part of Libav. + * + * Libav 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. + * + * Libav 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 Libav; 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 "internal.h" +#include "sunrast.h" + +typedef struct SUNRASTContext { + AVFrame picture; + PutByteContext p; + int depth; ///< depth of pixel + int length; ///< length (bytes) of image + int type; ///< type of file + int maptype; ///< type of colormap + int maplength; ///< length (bytes) of colormap + int size; +} SUNRASTContext; + +static void sunrast_image_write_header(AVCodecContext *avctx) +{ + SUNRASTContext *s = avctx->priv_data; + + bytestream2_put_be32u(&s->p, RAS_MAGIC); + bytestream2_put_be32u(&s->p, avctx->width); + bytestream2_put_be32u(&s->p, avctx->height); + bytestream2_put_be32u(&s->p, s->depth); + bytestream2_put_be32u(&s->p, s->length); + bytestream2_put_be32u(&s->p, s->type); + bytestream2_put_be32u(&s->p, s->maptype); + bytestream2_put_be32u(&s->p, s->maplength); +} + +static void sunrast_image_write_image(AVCodecContext *avctx, + const uint8_t *pixels, + const uint32_t *palette_data, + int linesize) +{ + SUNRASTContext *s = avctx->priv_data; + const uint8_t *ptr; + int len, alen, x; + + if (s->maplength) { // palettized + PutByteContext pb_r, pb_g; + int len = s->maplength / 3; + + pb_r = s->p; + bytestream2_skip_p(&s->p, len); + pb_g = s->p; + bytestream2_skip_p(&s->p, len); + + for (x = 0; x < len; x++) { + uint32_t pixel = palette_data[x]; + + bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF); + bytestream2_put_byteu(&pb_g, (pixel >> 8) & 0xFF); + bytestream2_put_byteu(&s->p, pixel & 0xFF); + } + } + + len = (s->depth * avctx->width + 7) >> 3; + alen = len + (len & 1); + ptr = pixels; + + if (s->type == RT_BYTE_ENCODED) { + uint8_t value, value2; + int run; + const uint8_t *end = pixels + avctx->height * linesize; + + ptr = pixels; + +#define GET_VALUE ptr >= end ? 0 : x >= len ? ptr[len-1] : ptr[x] + + x = 0; + value2 = GET_VALUE; + while (ptr < end) { + run = 1; + value = value2; + x++; + if (x >= alen) { + x = 0; + ptr += linesize; + } + + value2 = GET_VALUE; + while (value2 == value && run < 256 && ptr < end) { + x++; + run++; + if (x >= alen) { + x = 0; + ptr += linesize; + } + value2 = GET_VALUE; + } + + if (run > 2 || value == RLE_TRIGGER) { + bytestream2_put_byteu(&s->p, RLE_TRIGGER); + bytestream2_put_byteu(&s->p, run - 1); + if (run > 1) + bytestream2_put_byteu(&s->p, value); + } else if (run == 1) { + bytestream2_put_byteu(&s->p, value); + } else + bytestream2_put_be16u(&s->p, (value << 8) | value); + } + + // update data length for header + s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength; + } else { + int y; + for (y = 0; y < avctx->height; y++) { + bytestream2_put_buffer(&s->p, ptr, len); + if (len < alen) + bytestream2_put_byteu(&s->p, 0); + ptr += linesize; + } + } +} + +static av_cold int sunrast_encode_init(AVCodecContext *avctx) +{ + SUNRASTContext *s = avctx->priv_data; + + switch (avctx->coder_type) { + case FF_CODER_TYPE_RLE: + s->type = RT_BYTE_ENCODED; + break; + case FF_CODER_TYPE_RAW: + s->type = RT_STANDARD; + break; + default: + av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n"); + return AVERROR(EINVAL); + } + + avctx->coded_frame = &s->picture; + avctx->coded_frame->key_frame = 1; + avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I; + s->maptype = RMT_NONE; + s->maplength = 0; + + switch (avctx->pix_fmt) { + case PIX_FMT_MONOWHITE: + s->depth = 1; + break; + case PIX_FMT_PAL8 : + s->maptype = RMT_EQUAL_RGB; + s->maplength = 3 * 256; + case PIX_FMT_GRAY8: + s->depth = 8; + break; + case PIX_FMT_BGR24: + s->depth = 24; + break; + default: + return AVERROR_BUG; + } + s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3); + s->size = 32 + s->maplength + + s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1); + + return 0; +} + +static int sunrast_encode_frame(AVCodecContext *avctx, AVPacket *avpkt, + const AVFrame *frame, int *got_packet_ptr) +{ + SUNRASTContext *s = avctx->priv_data; + int ret; + + if ((ret = ff_alloc_packet(avpkt, s->size)) < 0) + return ret; + + bytestream2_init_writer(&s->p, avpkt->data, avpkt->size); + sunrast_image_write_header(avctx); + sunrast_image_write_image(avctx, frame->data[0], + (const uint32_t *)frame->data[1], + frame->linesize[0]); + // update data length in header after RLE + if (s->type == RT_BYTE_ENCODED) + AV_WB32(&avpkt->data[16], s->length); + + *got_packet_ptr = 1; + avpkt->size = bytestream2_tell_p(&s->p); + return 0; +} + +static const AVCodecDefault sunrast_defaults[] = { + { "coder", "rle" }, + { NULL }, +}; + +AVCodec ff_sunrast_encoder = { + .name = "sunrast", + .type = AVMEDIA_TYPE_VIDEO, + .id = CODEC_ID_SUNRAST, + .priv_data_size = sizeof(SUNRASTContext), + .init = sunrast_encode_init, + .encode2 = sunrast_encode_frame, + .defaults = sunrast_defaults, + .pix_fmts = (const enum PixelFormat[]){ PIX_FMT_BGR24, + PIX_FMT_PAL8, + PIX_FMT_GRAY8, + PIX_FMT_MONOWHITE, + PIX_FMT_NONE }, + .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"), +}; -- cgit v1.2.3