yading@10: /*
yading@10:  * Targa (.tga) image encoder
yading@10:  * Copyright (c) 2007 Bobby Bingham
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg 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:  * FFmpeg 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 FFmpeg; 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 <string.h>
yading@10: 
yading@10: #include "libavutil/internal.h"
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/pixdesc.h"
yading@10: #include "avcodec.h"
yading@10: #include "internal.h"
yading@10: #include "rle.h"
yading@10: #include "targa.h"
yading@10: 
yading@10: typedef struct TargaContext {
yading@10:     AVFrame picture;
yading@10: } TargaContext;
yading@10: 
yading@10: /**
yading@10:  * RLE compress the image, with maximum size of out_size
yading@10:  * @param outbuf Output buffer
yading@10:  * @param out_size Maximum output size
yading@10:  * @param pic Image to compress
yading@10:  * @param bpp Bytes per pixel
yading@10:  * @param w Image width
yading@10:  * @param h Image height
yading@10:  * @return Size of output in bytes, or -1 if larger than out_size
yading@10:  */
yading@10: static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
yading@10:                             int bpp, int w, int h)
yading@10: {
yading@10:     int y,ret;
yading@10:     uint8_t *out;
yading@10: 
yading@10:     out = outbuf;
yading@10: 
yading@10:     for(y = 0; y < h; y ++) {
yading@10:         ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
yading@10:         if(ret == -1){
yading@10:             return -1;
yading@10:         }
yading@10:         out+= ret;
yading@10:         out_size -= ret;
yading@10:     }
yading@10: 
yading@10:     return out - outbuf;
yading@10: }
yading@10: 
yading@10: static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
yading@10: {
yading@10:     int i, n = bpp * w;
yading@10:     uint8_t *out = outbuf;
yading@10:     uint8_t *ptr = pic->data[0];
yading@10: 
yading@10:     for(i=0; i < h; i++) {
yading@10:         memcpy(out, ptr, n);
yading@10:         out += n;
yading@10:         ptr += pic->linesize[0];
yading@10:     }
yading@10: 
yading@10:     return out - outbuf;
yading@10: }
yading@10: 
yading@10: static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
yading@10:                               const AVFrame *p, int *got_packet)
yading@10: {
yading@10:     int bpp, picsize, datasize = -1, ret, i;
yading@10:     uint8_t *out;
yading@10: 
yading@10:     if(avctx->width > 0xffff || avctx->height > 0xffff) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
yading@10:     if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     /* zero out the header and only set applicable fields */
yading@10:     memset(pkt->data, 0, 12);
yading@10:     AV_WL16(pkt->data+12, avctx->width);
yading@10:     AV_WL16(pkt->data+14, avctx->height);
yading@10:     /* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
yading@10:     pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
yading@10: 
yading@10:     out = pkt->data + 18;  /* skip past the header we write */
yading@10: 
yading@10:     avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
yading@10:     switch(avctx->pix_fmt) {
yading@10:     case AV_PIX_FMT_PAL8: {
yading@10:         int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
yading@10:         for (i = 0; i < 256; i++)
yading@10:             if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
yading@10:                 pal_bpp = 32;
yading@10:                 break;
yading@10:             }
yading@10:         pkt->data[1]  = 1;          /* palette present */
yading@10:         pkt->data[2]  = TGA_PAL;    /* uncompressed palettised image */
yading@10:         pkt->data[6]  = 1;          /* palette contains 256 entries */
yading@10:         pkt->data[7]  = pal_bpp;    /* palette contains pal_bpp bit entries */
yading@10:         pkt->data[16] = 8;          /* bpp */
yading@10:         for (i = 0; i < 256; i++)
yading@10:             if (pal_bpp == 32) {
yading@10:                 AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
yading@10:             } else {
yading@10:             AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
yading@10:             }
yading@10:         out += 32 * pal_bpp;        /* skip past the palette we just output */
yading@10:         break;
yading@10:         }
yading@10:     case AV_PIX_FMT_GRAY8:
yading@10:         pkt->data[2]  = TGA_BW;     /* uncompressed grayscale image */
yading@10:         avctx->bits_per_coded_sample = 0x28;
yading@10:         pkt->data[16] = 8;          /* bpp */
yading@10:         break;
yading@10:     case AV_PIX_FMT_RGB555LE:
yading@10:         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
yading@10:         avctx->bits_per_coded_sample =
yading@10:         pkt->data[16] = 16;         /* bpp */
yading@10:         break;
yading@10:     case AV_PIX_FMT_BGR24:
yading@10:         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
yading@10:         pkt->data[16] = 24;         /* bpp */
yading@10:         break;
yading@10:     case AV_PIX_FMT_BGRA:
yading@10:         pkt->data[2]  = TGA_RGB;    /* uncompressed true-color image */
yading@10:         pkt->data[16] = 32;         /* bpp */
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
yading@10:                av_get_pix_fmt_name(avctx->pix_fmt));
yading@10:         return AVERROR(EINVAL);
yading@10:     }
yading@10:     bpp = pkt->data[16] >> 3;
yading@10: 
yading@10:     /* try RLE compression */
yading@10:     if (avctx->coder_type != FF_CODER_TYPE_RAW)
yading@10:         datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
yading@10: 
yading@10:     /* if that worked well, mark the picture as RLE compressed */
yading@10:     if(datasize >= 0)
yading@10:         pkt->data[2] |= TGA_RLE;
yading@10: 
yading@10:     /* if RLE didn't make it smaller, go back to no compression */
yading@10:     else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
yading@10: 
yading@10:     out += datasize;
yading@10: 
yading@10:     /* The standard recommends including this section, even if we don't use
yading@10:      * any of the features it affords. TODO: take advantage of the pixel
yading@10:      * aspect ratio and encoder ID fields available? */
yading@10:     memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
yading@10: 
yading@10:     pkt->size   = out + 26 - pkt->data;
yading@10:     pkt->flags |= AV_PKT_FLAG_KEY;
yading@10:     *got_packet = 1;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static av_cold int targa_encode_init(AVCodecContext *avctx)
yading@10: {
yading@10:     TargaContext *s = avctx->priv_data;
yading@10: 
yading@10:     avcodec_get_frame_defaults(&s->picture);
yading@10:     s->picture.key_frame= 1;
yading@10:     s->picture.pict_type = AV_PICTURE_TYPE_I;
yading@10:     avctx->coded_frame= &s->picture;
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: AVCodec ff_targa_encoder = {
yading@10:     .name           = "targa",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_TARGA,
yading@10:     .priv_data_size = sizeof(TargaContext),
yading@10:     .init           = targa_encode_init,
yading@10:     .encode2        = targa_encode_frame,
yading@10:     .pix_fmts       = (const enum AVPixelFormat[]){
yading@10:         AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
yading@10:         AV_PIX_FMT_NONE
yading@10:     },
yading@10:     .long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
yading@10: };