245 lines
6.8 KiB
C
245 lines
6.8 KiB
C
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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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