yading@10: /*
yading@10:  * Sun Rasterfile (.sun/.ras/im{1,8,24}/.sunras) image encoder
yading@10:  * Copyright (c) 2012 Aneesh Dogra (lionaneesh) <lionaneesh@gmail.com>
yading@10:  *
yading@10:  * This file is part of Libav.
yading@10:  *
yading@10:  * Libav is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * Libav is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with Libav; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "sunrast.h"
yading@10: 
yading@10: typedef struct SUNRASTContext {
yading@10:     AVFrame picture;
yading@10:     PutByteContext p;
yading@10:     int depth;      ///< depth of pixel
yading@10:     int length;     ///< length (bytes) of image
yading@10:     int type;       ///< type of file
yading@10:     int maptype;    ///< type of colormap
yading@10:     int maplength;  ///< length (bytes) of colormap
yading@10:     int size;
yading@10: } SUNRASTContext;
yading@10: 
yading@10: static void sunrast_image_write_header(AVCodecContext *avctx)
yading@10: {
yading@10:     SUNRASTContext *s = avctx->priv_data;
yading@10: 
yading@10:     bytestream2_put_be32u(&s->p, RAS_MAGIC);
yading@10:     bytestream2_put_be32u(&s->p, avctx->width);
yading@10:     bytestream2_put_be32u(&s->p, avctx->height);
yading@10:     bytestream2_put_be32u(&s->p, s->depth);
yading@10:     bytestream2_put_be32u(&s->p, s->length);
yading@10:     bytestream2_put_be32u(&s->p, s->type);
yading@10:     bytestream2_put_be32u(&s->p, s->maptype);
yading@10:     bytestream2_put_be32u(&s->p, s->maplength);
yading@10: }
yading@10: 
yading@10: static void sunrast_image_write_image(AVCodecContext *avctx,
yading@10:                                       const uint8_t *pixels,
yading@10:                                       const uint32_t *palette_data,
yading@10:                                       int linesize)
yading@10: {
yading@10:     SUNRASTContext *s = avctx->priv_data;
yading@10:     const uint8_t *ptr;
yading@10:     int len, alen, x, y;
yading@10: 
yading@10:     if (s->maplength) {     // palettized
yading@10:         PutByteContext pb_r, pb_g;
yading@10:         int len = s->maplength / 3;
yading@10: 
yading@10:         pb_r = s->p;
yading@10:         bytestream2_skip_p(&s->p, len);
yading@10:         pb_g = s->p;
yading@10:         bytestream2_skip_p(&s->p, len);
yading@10: 
yading@10:         for (x = 0; x < len; x++) {
yading@10:             uint32_t pixel = palette_data[x];
yading@10: 
yading@10:             bytestream2_put_byteu(&pb_r, (pixel >> 16) & 0xFF);
yading@10:             bytestream2_put_byteu(&pb_g, (pixel >> 8)  & 0xFF);
yading@10:             bytestream2_put_byteu(&s->p,  pixel        & 0xFF);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     len  = (s->depth * avctx->width + 7) >> 3;
yading@10:     alen = len + (len & 1);
yading@10:     ptr  = pixels;
yading@10: 
yading@10:      if (s->type == RT_BYTE_ENCODED) {
yading@10:         uint8_t value, value2;
yading@10:         int run;
yading@10: 
yading@10:         ptr = pixels;
yading@10: 
yading@10: #define GET_VALUE y >= avctx->height ? 0 : x >= len ? ptr[len-1] : ptr[x]
yading@10: 
yading@10:         x = 0, y = 0;
yading@10:         value2 = GET_VALUE;
yading@10:         while (y < avctx->height) {
yading@10:             run = 1;
yading@10:             value = value2;
yading@10:             x++;
yading@10:             if (x >= alen) {
yading@10:                 x = 0;
yading@10:                 ptr += linesize, y++;
yading@10:             }
yading@10: 
yading@10:             value2 = GET_VALUE;
yading@10:             while (value2 == value && run < 256 && y < avctx->height) {
yading@10:                 x++;
yading@10:                 run++;
yading@10:                 if (x >= alen) {
yading@10:                     x = 0;
yading@10:                     ptr += linesize, y++;
yading@10:                 }
yading@10:                 value2 = GET_VALUE;
yading@10:             }
yading@10: 
yading@10:             if (run > 2 || value == RLE_TRIGGER) {
yading@10:                 bytestream2_put_byteu(&s->p, RLE_TRIGGER);
yading@10:                 bytestream2_put_byteu(&s->p, run - 1);
yading@10:                 if (run > 1)
yading@10:                     bytestream2_put_byteu(&s->p, value);
yading@10:             } else if (run == 1) {
yading@10:                 bytestream2_put_byteu(&s->p, value);
yading@10:             } else
yading@10:                 bytestream2_put_be16u(&s->p, (value << 8) | value);
yading@10:         }
yading@10: 
yading@10:         // update data length for header
yading@10:         s->length = bytestream2_tell_p(&s->p) - 32 - s->maplength;
yading@10:     } else {
yading@10:         for (y = 0; y < avctx->height; y++) {
yading@10:             bytestream2_put_buffer(&s->p, ptr, len);
yading@10:             if (len < alen)
yading@10:                 bytestream2_put_byteu(&s->p, 0);
yading@10:             ptr += linesize;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static av_cold int sunrast_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     SUNRASTContext *s = avctx->priv_data;
yading@10: 
yading@10:     switch (avctx->coder_type) {
yading@10:     case FF_CODER_TYPE_RLE:
yading@10:         s->type = RT_BYTE_ENCODED;
yading@10:         break;
yading@10:     case FF_CODER_TYPE_RAW:
yading@10:         s->type = RT_STANDARD;
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "invalid coder_type\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10: 
yading@10:     avctx->coded_frame            = &s->picture;
yading@10:     avctx->coded_frame->key_frame = 1;
yading@10:     avctx->coded_frame->pict_type = AV_PICTURE_TYPE_I;
yading@10:     s->maptype                    = RMT_NONE;
yading@10:     s->maplength                  = 0;
yading@10: 
yading@10:     switch (avctx->pix_fmt) {
yading@10:     case AV_PIX_FMT_MONOWHITE:
yading@10:         s->depth = 1;
yading@10:         break;
yading@10:     case AV_PIX_FMT_PAL8 :
yading@10:         s->maptype   = RMT_EQUAL_RGB;
yading@10:         s->maplength = 3 * 256;
yading@10:     case AV_PIX_FMT_GRAY8:
yading@10:         s->depth = 8;
yading@10:         break;
yading@10:     case AV_PIX_FMT_BGR24:
yading@10:         s->depth = 24;
yading@10:         break;
yading@10:     default:
yading@10:         return AVERROR_BUG;
yading@10:     }
yading@10:     s->length = avctx->height * (FFALIGN(avctx->width * s->depth, 16) >> 3);
yading@10:     s->size   = 32 + s->maplength +
yading@10:                 s->length * (s->type == RT_BYTE_ENCODED ? 2 : 1);
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int sunrast_encode_frame(AVCodecContext *avctx,  AVPacket *avpkt,
yading@10:                                 const AVFrame *frame, int *got_packet_ptr)
yading@10: {
yading@10:     SUNRASTContext *s = avctx->priv_data;
yading@10:     int ret;
yading@10: 
yading@10:     if ((ret = ff_alloc_packet2(avctx, avpkt, s->size)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     bytestream2_init_writer(&s->p, avpkt->data, avpkt->size);
yading@10:     sunrast_image_write_header(avctx);
yading@10:     sunrast_image_write_image(avctx, frame->data[0],
yading@10:                               (const uint32_t *)frame->data[1],
yading@10:                               frame->linesize[0]);
yading@10:     // update data length in header after RLE
yading@10:     if (s->type == RT_BYTE_ENCODED)
yading@10:         AV_WB32(&avpkt->data[16], s->length);
yading@10: 
yading@10:     *got_packet_ptr = 1;
yading@10:     avpkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     avpkt->size = bytestream2_tell_p(&s->p);
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static const AVCodecDefault sunrast_defaults[] = {
yading@10:      { "coder", "rle" },
yading@10:      { NULL },
yading@10: };
yading@10: 
yading@10: AVCodec ff_sunrast_encoder = {
yading@10:     .name           = "sunrast",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_SUNRAST,
yading@10:     .priv_data_size = sizeof(SUNRASTContext),
yading@10:     .init           = sunrast_encode_init,
yading@10:     .encode2        = sunrast_encode_frame,
yading@10:     .defaults       = sunrast_defaults,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]){ AV_PIX_FMT_BGR24,
yading@10:                                                   AV_PIX_FMT_PAL8,
yading@10:                                                   AV_PIX_FMT_GRAY8,
yading@10:                                                   AV_PIX_FMT_MONOWHITE,
yading@10:                                                   AV_PIX_FMT_NONE },
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
yading@10: };