mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 6640 to svn://svn.ffmpeg.org/ffmpeg/trunkpull/126/head
Kostya Shishkov
18 years ago
parent
e7becfb25f
commit
3689cf1649
8 changed files with 256 additions and 2 deletions
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/*
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* Targa (.tga) image decoder |
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* Copyright (c) 2006 Konstantin Shishkov |
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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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*/ |
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#include "avcodec.h" |
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enum TargaCompr{ |
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TGA_NODATA = 0, // no image data
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TGA_PAL = 1, // palettized
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TGA_RGB = 2, // true-color
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TGA_BW = 3, // black & white or grayscale
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TGA_RLE = 8, // flag pointing that data is RLE-coded
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}; |
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typedef struct TargaContext { |
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AVFrame picture; |
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int width, height; |
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int bpp; |
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int color_type; |
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int compression_type; |
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} TargaContext; |
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static void targa_decode_rle(AVCodecContext *avctx, TargaContext *s, uint8_t *src, uint8_t *dst, int w, int h, int stride, int bpp) |
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{ |
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int i, x, y; |
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int depth = (bpp + 1) >> 3; |
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int type, count; |
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int diff; |
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diff = stride - w * depth; |
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x = y = 0; |
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while(y < h){ |
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type = *src++; |
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count = (type & 0x7F) + 1; |
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type &= 0x80; |
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if((x + count > w) && (x + count + 1 > (h - y) * w)){ |
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av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count); |
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return; |
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} |
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for(i = 0; i < count; i++){ |
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switch(depth){ |
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case 1: |
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*dst = *src; |
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break; |
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case 2: |
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*((uint16_t*)dst) = LE_16(src); |
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break; |
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case 3: |
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dst[0] = src[0]; |
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dst[1] = src[1]; |
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dst[2] = src[2]; |
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break; |
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} |
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dst += depth; |
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if(!type) |
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src += depth; |
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x++; |
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if(x == w){ |
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x = 0; |
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y++; |
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dst += diff; |
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} |
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} |
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if(type) |
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src += depth; |
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} |
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} |
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static int decode_frame(AVCodecContext *avctx, |
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void *data, int *data_size, |
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uint8_t *buf, int buf_size) |
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{ |
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TargaContext * const s = avctx->priv_data; |
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AVFrame *picture = data; |
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AVFrame * const p= (AVFrame*)&s->picture; |
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uint8_t *dst; |
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int stride; |
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int idlen, pal, compr, x, y, w, h, bpp, flags; |
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int first_clr, colors, csize; |
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/* parse image header */ |
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idlen = *buf++; |
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pal = *buf++; |
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compr = *buf++; |
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first_clr = LE_16(buf); buf += 2; |
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colors = LE_16(buf); buf += 2; |
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csize = *buf++; |
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x = LE_16(buf); buf += 2; |
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y = LE_16(buf); buf += 2; |
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w = LE_16(buf); buf += 2; |
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h = LE_16(buf); buf += 2; |
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bpp = *buf++; |
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flags = *buf++; |
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//skip identifier if any
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buf += idlen; |
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s->bpp = bpp; |
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s->width = w; |
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s->height = h; |
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switch(s->bpp){ |
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case 8: |
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avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8; |
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break; |
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case 15: |
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avctx->pix_fmt = PIX_FMT_RGB555; |
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break; |
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case 16: |
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avctx->pix_fmt = PIX_FMT_RGB555; |
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break; |
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case 24: |
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avctx->pix_fmt = PIX_FMT_BGR24; |
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break; |
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default: |
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av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", avctx->bits_per_sample); |
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return -1; |
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} |
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if(s->picture.data[0]) |
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avctx->release_buffer(avctx, &s->picture); |
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if(avcodec_check_dimensions(avctx, w, h)) |
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return -1; |
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if(w != avctx->width || h != avctx->height) |
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avcodec_set_dimensions(avctx, w, h); |
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if(avctx->get_buffer(avctx, p) < 0){ |
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av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n"); |
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return -1; |
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} |
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if(flags & 0x20){ |
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dst = p->data[0]; |
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stride = p->linesize[0]; |
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}else{ //image is upside-down
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dst = p->data[0] + p->linesize[0] * (h - 1); |
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stride = -p->linesize[0]; |
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} |
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if(avctx->pix_fmt == PIX_FMT_PAL8 && avctx->palctrl){ |
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memcpy(p->data[1], avctx->palctrl->palette, AVPALETTE_SIZE); |
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if(avctx->palctrl->palette_changed){ |
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p->palette_has_changed = 1; |
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avctx->palctrl->palette_changed = 0; |
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} |
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} |
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if(colors){ |
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if((colors + first_clr) > 256){ |
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av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr); |
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return -1; |
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} |
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if(csize != 24){ |
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av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize); |
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return -1; |
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} |
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if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
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buf += colors * ((csize + 1) >> 3); |
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else{ |
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int r, g, b, t; |
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int32_t *pal = ((int32_t*)p->data[1]) + first_clr; |
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for(t = 0; t < colors; t++){ |
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r = *buf++; |
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g = *buf++; |
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b = *buf++; |
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*pal++ = (b << 16) | (g << 8) | r; |
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} |
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p->palette_has_changed = 1; |
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avctx->palctrl->palette_changed = 0; |
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} |
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} |
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if((compr & (~TGA_RLE)) == TGA_NODATA) |
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memset(p->data[0], 0, p->linesize[0] * s->height); |
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else{ |
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if(compr & TGA_RLE) |
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targa_decode_rle(avctx, s, buf, dst, avctx->width, avctx->height, stride, bpp); |
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else{ |
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for(y = 0; y < s->height; y++){ |
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#ifdef WORDS_BIGENDIAN |
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if((s->bpp + 1) >> 3 == 2){ |
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uint16_t *dst16 = (uint16_t*)dst; |
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for(x = 0; x < s->width; x++) |
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dst16[x] = LE_16(buf + x * 2); |
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}else |
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#endif |
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memcpy(dst, buf, s->width * ((s->bpp + 1) >> 3)); |
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dst += stride; |
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buf += s->width * ((s->bpp + 1) >> 3); |
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} |
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} |
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} |
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*picture= *(AVFrame*)&s->picture; |
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*data_size = sizeof(AVPicture); |
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return buf_size; |
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} |
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static int targa_init(AVCodecContext *avctx){ |
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TargaContext *s = avctx->priv_data; |
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avcodec_get_frame_defaults((AVFrame*)&s->picture); |
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avctx->coded_frame= (AVFrame*)&s->picture; |
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s->picture.data[0] = NULL; |
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return 0; |
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} |
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static int targa_end(AVCodecContext *avctx){ |
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TargaContext *s = avctx->priv_data; |
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if(s->picture.data[0]) |
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avctx->release_buffer(avctx, &s->picture); |
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return 0; |
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} |
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AVCodec targa_decoder = { |
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"targa", |
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CODEC_TYPE_VIDEO, |
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CODEC_ID_TARGA, |
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sizeof(TargaContext), |
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targa_init, |
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NULL, |
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targa_end, |
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decode_frame, |
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0, |
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NULL |
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}; |
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