/* * 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 }, };