61a9f099b7
Current ImageMagick fails to read such files, therefore only write the 32bit palette if the palette actually contains any transparency information.
202 lines
6.6 KiB
C
202 lines
6.6 KiB
C
/*
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* Targa (.tga) image encoder
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* Copyright (c) 2007 Bobby Bingham
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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 <string.h>
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#include "libavutil/internal.h"
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#include "libavutil/intreadwrite.h"
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#include "libavutil/pixdesc.h"
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#include "avcodec.h"
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#include "internal.h"
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#include "rle.h"
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#include "targa.h"
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typedef struct TargaContext {
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AVFrame picture;
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} TargaContext;
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/**
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* RLE compress the image, with maximum size of out_size
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* @param outbuf Output buffer
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* @param out_size Maximum output size
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* @param pic Image to compress
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* @param bpp Bytes per pixel
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* @param w Image width
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* @param h Image height
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* @return Size of output in bytes, or -1 if larger than out_size
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*/
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static int targa_encode_rle(uint8_t *outbuf, int out_size, const AVFrame *pic,
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int bpp, int w, int h)
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{
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int y,ret;
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uint8_t *out;
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out = outbuf;
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for(y = 0; y < h; y ++) {
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ret = ff_rle_encode(out, out_size, pic->data[0] + pic->linesize[0] * y, bpp, w, 0x7f, 0, -1, 0);
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if(ret == -1){
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return -1;
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}
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out+= ret;
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out_size -= ret;
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}
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return out - outbuf;
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}
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static int targa_encode_normal(uint8_t *outbuf, const AVFrame *pic, int bpp, int w, int h)
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{
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int i, n = bpp * w;
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uint8_t *out = outbuf;
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uint8_t *ptr = pic->data[0];
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for(i=0; i < h; i++) {
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memcpy(out, ptr, n);
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out += n;
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ptr += pic->linesize[0];
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}
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return out - outbuf;
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}
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static int targa_encode_frame(AVCodecContext *avctx, AVPacket *pkt,
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const AVFrame *p, int *got_packet)
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{
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int bpp, picsize, datasize = -1, ret, i;
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uint8_t *out;
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if(avctx->width > 0xffff || avctx->height > 0xffff) {
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av_log(avctx, AV_LOG_ERROR, "image dimensions too large\n");
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return AVERROR(EINVAL);
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}
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picsize = avpicture_get_size(avctx->pix_fmt, avctx->width, avctx->height);
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if ((ret = ff_alloc_packet2(avctx, pkt, picsize + 45)) < 0)
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return ret;
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/* zero out the header and only set applicable fields */
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memset(pkt->data, 0, 12);
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AV_WL16(pkt->data+12, avctx->width);
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AV_WL16(pkt->data+14, avctx->height);
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/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */
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pkt->data[17] = 0x20 | (avctx->pix_fmt == AV_PIX_FMT_BGRA ? 8 : 0);
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out = pkt->data + 18; /* skip past the header we write */
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avctx->bits_per_coded_sample = av_get_bits_per_pixel(&av_pix_fmt_descriptors[avctx->pix_fmt]);
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switch(avctx->pix_fmt) {
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case AV_PIX_FMT_PAL8: {
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int pal_bpp = 24; /* Only write 32bit palette if there is transparency information */
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for (i = 0; i < 256; i++)
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if (AV_RN32(p->data[1] + 4 * i) >> 24 != 0xFF) {
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pal_bpp = 32;
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break;
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}
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pkt->data[1] = 1; /* palette present */
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pkt->data[2] = TGA_PAL; /* uncompressed palettised image */
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pkt->data[6] = 1; /* palette contains 256 entries */
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pkt->data[7] = pal_bpp; /* palette contains pal_bpp bit entries */
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pkt->data[16] = 8; /* bpp */
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for (i = 0; i < 256; i++)
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if (pal_bpp == 32) {
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AV_WL32(pkt->data + 18 + 4 * i, *(uint32_t *)(p->data[1] + i * 4));
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} else {
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AV_WL24(pkt->data + 18 + 3 * i, *(uint32_t *)(p->data[1] + i * 4));
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}
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out += 32 * pal_bpp; /* skip past the palette we just output */
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break;
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}
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case AV_PIX_FMT_GRAY8:
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pkt->data[2] = TGA_BW; /* uncompressed grayscale image */
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avctx->bits_per_coded_sample = 0x28;
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pkt->data[16] = 8; /* bpp */
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break;
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case AV_PIX_FMT_RGB555LE:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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avctx->bits_per_coded_sample =
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pkt->data[16] = 16; /* bpp */
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break;
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case AV_PIX_FMT_BGR24:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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pkt->data[16] = 24; /* bpp */
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break;
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case AV_PIX_FMT_BGRA:
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pkt->data[2] = TGA_RGB; /* uncompressed true-color image */
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pkt->data[16] = 32; /* bpp */
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break;
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default:
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av_log(avctx, AV_LOG_ERROR, "Pixel format '%s' not supported.\n",
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av_get_pix_fmt_name(avctx->pix_fmt));
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return AVERROR(EINVAL);
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}
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bpp = pkt->data[16] >> 3;
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/* try RLE compression */
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if (avctx->coder_type != FF_CODER_TYPE_RAW)
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datasize = targa_encode_rle(out, picsize, p, bpp, avctx->width, avctx->height);
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/* if that worked well, mark the picture as RLE compressed */
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if(datasize >= 0)
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pkt->data[2] |= TGA_RLE;
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/* if RLE didn't make it smaller, go back to no compression */
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else datasize = targa_encode_normal(out, p, bpp, avctx->width, avctx->height);
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out += datasize;
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/* The standard recommends including this section, even if we don't use
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* any of the features it affords. TODO: take advantage of the pixel
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* aspect ratio and encoder ID fields available? */
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memcpy(out, "\0\0\0\0\0\0\0\0TRUEVISION-XFILE.", 26);
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pkt->size = out + 26 - pkt->data;
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pkt->flags |= AV_PKT_FLAG_KEY;
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*got_packet = 1;
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return 0;
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}
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static av_cold int targa_encode_init(AVCodecContext *avctx)
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{
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TargaContext *s = avctx->priv_data;
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avcodec_get_frame_defaults(&s->picture);
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s->picture.key_frame= 1;
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s->picture.pict_type = AV_PICTURE_TYPE_I;
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avctx->coded_frame= &s->picture;
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return 0;
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}
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AVCodec ff_targa_encoder = {
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.name = "targa",
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_TARGA,
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.priv_data_size = sizeof(TargaContext),
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.init = targa_encode_init,
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.encode2 = targa_encode_frame,
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.pix_fmts = (const enum AVPixelFormat[]){
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AV_PIX_FMT_BGR24, AV_PIX_FMT_BGRA, AV_PIX_FMT_RGB555LE, AV_PIX_FMT_GRAY8, AV_PIX_FMT_PAL8,
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AV_PIX_FMT_NONE
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},
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.long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"),
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};
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