forked from KolibriOS/kolibrios
184 lines
6.2 KiB
C
184 lines
6.2 KiB
C
/*
|
|
* Targa (.tga) image encoder
|
|
* Copyright (c) 2007 Bobby Bingham
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg 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.
|
|
*
|
|
* FFmpeg 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 FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include <string.h>
|
|
|
|
#include "libavutil/internal.h"
|
|
#include "libavutil/intreadwrite.h"
|
|
#include "libavutil/pixdesc.h"
|
|
#include "avcodec.h"
|
|
#include "internal.h"
|
|
#include "rle.h"
|
|
#include "targa.h"
|
|
|
|
/**
|
|
* RLE compress the image, with maximum size of out_size
|
|
* @param outbuf Output buffer
|
|
* @param out_size Maximum output size
|
|
* @param pic Image to compress
|
|
* @param bpp Bytes per pixel
|
|
* @param w Image width
|
|
* @param h Image height
|
|
* @return Size of output in bytes, or -1 if larger than out_size
|
|
*/
|
|
static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
|
|
int bpp, int w, int h)
|
|
{
|
|
int y,ret;
|
|
uint8_t *out;
|
|
|
|
out = outbuf;
|
|
|
|
for(y = 0; y < h; y ++) {
|
|
ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
|
|
if(ret == -1){
|
|
return -1;
|
|
}
|
|
out+= ret;
|
|
out_size -= ret;
|
|
}
|
|
|
|
return out - outbuf;
|
|
}
|
|
|
|
static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
|
|
{
|
|
int i, n = bpp * w;
|
|
uint8_t *out = outbuf;
|
|
uint8_t *ptr = pic->data[0];
|
|
|
|
for(i=0; i < h; i++) {
|
|
memcpy(out, ptr, n);
|
|
out += n;
|
|
ptr += pic->linesize[0];
|
|
}
|
|
|
|
return out - outbuf;
|
|
}
|
|
|
|
static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
|
|
const AVFrame *p, int *got_packet)
|
|
{
|
|
int bpp, picsize, datasize = -1, ret, i;
|
|
uint8_t *out;
|
|
|
|
if(avctx->width > 0xffff || avctx->height > 0xffff) {
|
|
av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
|
|
return AVERROR(EINVAL);
|
|
}
|
|
picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
|
|
if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
|
|
return ret;
|
|
|
|
/* zero out the header and only set applicable fields */
|
|
memset(pkt->data, 0, 12);
|
|
AV_WL16(pkt->data+12, avctx->width);
|
|
AV_WL16(pkt->data+14, avctx->height);
|
|
/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
|
|
pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
|
|
|
|
out = pkt->data + 18; /* skip past the header we write */
|
|
|
|
avctx->bits_per_coded_sample = av_get_bits_per_pixel(av_pix_fmt_desc_get(avctx->pix_fmt));
|
|
switch(avctx->pix_fmt) {
|
|
case AV_PIX_FMT_PAL8: {
|
|
int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
|
|
for (i = 0; i < 256; i++)
|
|
if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
|
|
pal_bpp = 32;
|
|
break;
|
|
}
|
|
pkt->data[1] = 1; /* palette present */
|
|
pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
|
|
pkt->data[6] = 1; /* palette contains 256 entries */
|
|
pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
|
|
pkt->data[16] = 8; /* bpp */
|
|
for (i = 0; i < 256; i++)
|
|
if (pal_bpp == 32) {
|
|
AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
|
|
} else {
|
|
AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
|
|
}
|
|
out += 32 * pal_bpp; /* skip past the palette we just output */
|
|
break;
|
|
}
|
|
case AV_PIX_FMT_GRAY8:
|
|
pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
|
|
avctx->bits_per_coded_sample = 0x28;
|
|
pkt->data[16] = 8; /* bpp */
|
|
break;
|
|
case AV_PIX_FMT_RGB555LE:
|
|
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
|
|
avctx->bits_per_coded_sample =
|
|
pkt->data[16] = 16; /* bpp */
|
|
break;
|
|
case AV_PIX_FMT_BGR24:
|
|
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
|
|
pkt->data[16] = 24; /* bpp */
|
|
break;
|
|
case AV_PIX_FMT_BGRA:
|
|
pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
|
|
pkt->data[16] = 32; /* bpp */
|
|
break;
|
|
default:
|
|
av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
|
|
av_get_pix_fmt_name(avctx->pix_fmt));
|
|
return AVERROR(EINVAL);
|
|
}
|
|
bpp = pkt->data[16] >> 3;
|
|
|
|
/* try RLE compression */
|
|
if (avctx->coder_type != FF_CODER_TYPE_RAW)
|
|
datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
|
|
|
|
/* if that worked well, mark the picture as RLE compressed */
|
|
if(datasize >= 0)
|
|
pkt->data[2] |= TGA_RLE;
|
|
|
|
/* if RLE didn't make it smaller, go back to no compression */
|
|
else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
|
|
|
|
out += datasize;
|
|
|
|
/* The standard recommends including this section, even if we don't use
|
|
* any of the features it affords. TODO: take advantage of the pixel
|
|
* aspect ratio and encoder ID fields available? */
|
|
memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
|
|
|
|
pkt->size = out + 26 - pkt->data;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
*got_packet = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVCodec ff_targa_encoder = {
|
|
.name = "targa",
|
|
.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
|
|
.type = AVMEDIA_TYPE_VIDEO,
|
|
.id = AV_CODEC_ID_TARGA,
|
|
.encode2 = targa_encode_frame,
|
|
.pix_fmts = (const enum AVPixelFormat[]){
|
|
AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
|
|
AV_PIX_FMT_NONE
|
|
},
|
|
};
|