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170 lines
5.2 KiB
170 lines
5.2 KiB
/* |
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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 Libav. |
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* |
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* Libav 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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* Libav 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 Libav; 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 "libavutil/intreadwrite.h" |
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#include "avcodec.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, 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, 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, |
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unsigned char *outbuf, |
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int buf_size, void *data){ |
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AVFrame *p = data; |
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int bpp, picsize, datasize = -1; |
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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(buf_size < picsize + 45) { |
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av_log(avctx, AV_LOG_ERROR, "encoded frame too large\n"); |
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return AVERROR(EINVAL); |
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} |
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p->pict_type= AV_PICTURE_TYPE_I; |
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p->key_frame= 1; |
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/* zero out the header and only set applicable fields */ |
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memset(outbuf, 0, 12); |
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AV_WL16(outbuf+12, avctx->width); |
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AV_WL16(outbuf+14, avctx->height); |
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/* image descriptor byte: origin is always top-left, bits 0-3 specify alpha */ |
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outbuf[17] = 0x20 | (avctx->pix_fmt == PIX_FMT_BGRA ? 8 : 0); |
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switch(avctx->pix_fmt) { |
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case PIX_FMT_GRAY8: |
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outbuf[2] = TGA_BW; /* uncompressed grayscale image */ |
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outbuf[16] = 8; /* bpp */ |
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break; |
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case PIX_FMT_RGB555LE: |
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outbuf[2] = TGA_RGB; /* uncompresses true-color image */ |
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outbuf[16] = 16; /* bpp */ |
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break; |
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case PIX_FMT_BGR24: |
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outbuf[2] = TGA_RGB; /* uncompressed true-color image */ |
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outbuf[16] = 24; /* bpp */ |
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break; |
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case PIX_FMT_BGRA: |
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outbuf[2] = TGA_RGB; /* uncompressed true-color image */ |
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outbuf[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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avcodec_get_pix_fmt_name(avctx->pix_fmt)); |
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return AVERROR(EINVAL); |
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} |
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bpp = outbuf[16] >> 3; |
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out = outbuf + 18; /* skip past the header we just output */ |
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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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outbuf[2] |= 8; |
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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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return out + 26 - outbuf; |
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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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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 = CODEC_ID_TARGA, |
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.priv_data_size = sizeof(TargaContext), |
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.init = targa_encode_init, |
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.encode = targa_encode_frame, |
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.pix_fmts= (const enum PixelFormat[]){PIX_FMT_BGR24, PIX_FMT_BGRA, PIX_FMT_RGB555LE, PIX_FMT_GRAY8, PIX_FMT_NONE}, |
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.long_name= NULL_IF_CONFIG_SMALL("Truevision Targa image"), |
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};
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