libavcodec/targa.c - third_party/ffmpeg - Git at Google

 /*
  * Targa (.tga) image decoder
  * Copyright (c) 2006 Konstantin Shishkov
  *
  * 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 "libavutil/intreadwrite.h"
 #include "libavutil/imgutils.h"
 #include "avcodec.h"
 #include "bytestream.h"
 #include "targa.h"

 typedef struct TargaContext {
     AVFrame picture;

     int width, height;
     int bpp;
     int color_type;
     int compression_type;
 } TargaContext;

 #define CHECK_BUFFER_SIZE(buf, buf_end, needed, where) \
     if(needed > buf_end - buf){ \
         av_log(avctx, AV_LOG_ERROR, "Problem: unexpected end of data while reading " where "\n"); \
         return -1; \
     } \

 static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, const uint8_t *src, int src_size, uint8_t *dst, int w, int h, int stride, int bpp)
 {
     int i, x, y;
     int depth = (bpp + 1) >> 3;
     int type, count;
     int diff;
     const uint8_t *src_end = src + src_size;

     diff = stride - w * depth;
     x = y = 0;
     while(y < h){
         CHECK_BUFFER_SIZE(src, src_end, 1, "image type");
         type = *src++;
         count = (type & 0x7F) + 1;
         type &= 0x80;
         if((x + count > w) && (x + count + 1 > (h - y) * w)){
             av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count);
             return -1;
         }
         if(type){
             CHECK_BUFFER_SIZE(src, src_end, depth, "image data");
         }else{
             CHECK_BUFFER_SIZE(src, src_end, count * depth, "image data");
         }
         for(i = 0; i < count; i++){
             switch(depth){
             case 1:
                 *dst = *src;
                 break;
             case 2:
                 AV_WN16A(dst, AV_RN16A(src));
                 break;
             case 3:
                 dst[0] = src[0];
                 dst[1] = src[1];
                 dst[2] = src[2];
                 break;
             case 4:
                 AV_WN32A(dst, AV_RN32A(src));
                 break;
             }
             dst += depth;
             if(!type)
                 src += depth;

             x++;
             if(x == w){
                 x = 0;
                 y++;
                 dst += diff;
             }
         }
         if(type)
             src += depth;
     }
     return src_size;
 }

 static int decode_frame(AVCodecContext *avctx,
                         void *data, int *data_size,
                         AVPacket *avpkt)
 {
     const uint8_t *buf = avpkt->data;
     const uint8_t *buf_end = avpkt->data + avpkt->size;
     TargaContext * const s = avctx->priv_data;
     AVFrame *picture = data;
     AVFrame * const p= (AVFrame*)&s->picture;
     uint8_t *dst;
     int stride;
     int idlen, pal, compr, y, w, h, bpp, flags;
     int first_clr, colors, csize;

     /* parse image header */
     CHECK_BUFFER_SIZE(buf, buf_end, 18, "header");
     idlen = *buf++;
     pal = *buf++;
     compr = *buf++;
     first_clr = bytestream_get_le16(&buf);
     colors = bytestream_get_le16(&buf);
     csize = *buf++;
     if (!pal && (first_clr || colors || csize)) {
         av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
         // specification says we should ignore those value in this case
         first_clr = colors = csize = 0;
     }
     buf += 2; /* x */
     y = bytestream_get_le16(&buf);
     w = bytestream_get_le16(&buf);
     h = bytestream_get_le16(&buf);
     bpp = *buf++;
     flags = *buf++;
     //skip identifier if any
     CHECK_BUFFER_SIZE(buf, buf_end, idlen, "identifiers");
     buf += idlen;
     s->bpp = bpp;
     s->width = w;
     s->height = h;
     switch(s->bpp){
     case 8:
         avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
         break;
     case 15:
     case 16:
         avctx->pix_fmt = PIX_FMT_RGB555LE;
         break;
     case 24:
         avctx->pix_fmt = PIX_FMT_BGR24;
         break;
     case 32:
         avctx->pix_fmt = PIX_FMT_BGRA;
         break;
     default:
         av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", s->bpp);
         return -1;
     }

     if(s->picture.data[0])
         avctx->release_buffer(avctx, &s->picture);

     if(av_image_check_size(w, h, 0, avctx))
         return -1;
     if(w != avctx->width || h != avctx->height)
         avcodec_set_dimensions(avctx, w, h);
     if(avctx->get_buffer(avctx, p) < 0){
         av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
         return -1;
     }
     if(flags & 0x20){
         dst = p->data[0];
         stride = p->linesize[0];
     }else{ //image is upside-down
         dst = p->data[0] + p->linesize[0] * (h - 1);
         stride = -p->linesize[0];
     }

     if(colors){
         int pal_size, pal_sample_size;
         if((colors + first_clr) > 256){
             av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
             return -1;
         }
         switch (csize) {
         case 24: pal_sample_size = 3; break;
         case 16:
         case 15: pal_sample_size = 2; break;
         default:
             av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
             return -1;
         }
         pal_size = colors * pal_sample_size;
         CHECK_BUFFER_SIZE(buf, buf_end, pal_size, "color table");
         if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
             buf += pal_size;
         else{
             int t;
             uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;

             switch (pal_sample_size) {
             case 3:
                 /* RGB24 */
                 for (t = 0; t < colors; t++)
                     *pal++ = (0xffU<<24) | bytestream_get_le24(&buf);
                 break;
             case 2:
                 /* RGB555 */
                 for (t = 0; t < colors; t++) {
                     uint32_t v = bytestream_get_le16(&buf);
                     v = ((v & 0x7C00) <<  9) |
                         ((v & 0x03E0) <<  6) |
                         ((v & 0x001F) <<  3);
                     /* left bit replication */
                     v |= (v & 0xE0E0E0U) >> 5;
                     *pal++ = (0xffU<<24) | v;
                 }
                 break;
             }
             p->palette_has_changed = 1;
         }
     }
     if((compr & (~TGA_RLE)) == TGA_NODATA)
         memset(p->data[0], 0, p->linesize[0] * s->height);
     else{
         if(compr & TGA_RLE){
             int res = targa_decode_rle(avctx, s, buf, buf_end - buf, dst, avctx->width, avctx->height, stride, bpp);
             if (res < 0)
                 return -1;
             buf += res;
         }else{
             size_t img_size = s->width * ((s->bpp + 1) >> 3);
             CHECK_BUFFER_SIZE(buf, buf_end, img_size, "image data");
             for(y = 0; y < s->height; y++){
                     memcpy(dst, buf, img_size);

                 dst += stride;
                 buf += img_size;
             }
         }
     }
     if(flags & 0x10){ // right-to-left, needs horizontal flip
         int x;
         for(y = 0; y < s->height; y++){
             void *line = &p->data[0][y * p->linesize[0]];
             for(x = 0; x < s->width >> 1; x++){
                 switch(s->bpp){
                 case 32:
                     FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[s->width - x - 1]);
                     break;
                 case 24:
                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x    ], ((uint8_t *)line)[3 * s->width - 3 * x - 3]);
                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * s->width - 3 * x - 2]);
                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * s->width - 3 * x - 1]);
                     break;
                 case 16:
                     FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[s->width - x - 1]);
                     break;
                 case 8:
                     FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[s->width - x - 1]);
                 }
             }
         }
     }

     *picture= *(AVFrame*)&s->picture;
     *data_size = sizeof(AVPicture);

     return avpkt->size;
 }

 static av_cold int targa_init(AVCodecContext *avctx){
     TargaContext *s = avctx->priv_data;

     avcodec_get_frame_defaults((AVFrame*)&s->picture);
     avctx->coded_frame= (AVFrame*)&s->picture;

     return 0;
 }

 static av_cold int targa_end(AVCodecContext *avctx){
     TargaContext *s = avctx->priv_data;

     if(s->picture.data[0])
         avctx->release_buffer(avctx, &s->picture);

     return 0;
 }

 AVCodec ff_targa_decoder = {
     .name           = "targa",
     .type           = AVMEDIA_TYPE_VIDEO,
     .id             = CODEC_ID_TARGA,
     .priv_data_size = sizeof(TargaContext),
     .init           = targa_init,
     .close          = targa_end,
     .decode         = decode_frame,
     .capabilities   = CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
 };
	/*
	* Targa (.tga) image decoder
	* Copyright (c) 2006 Konstantin Shishkov
	*
	* 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 "libavutil/intreadwrite.h"
	#include "libavutil/imgutils.h"
	#include "avcodec.h"
	#include "bytestream.h"
	#include "targa.h"

	typedef struct TargaContext {
	AVFrame picture;

	int width, height;
	int bpp;
	int color_type;
	int compression_type;
	} TargaContext;

	#define CHECK_BUFFER_SIZE(buf, buf_end, needed, where) \
	if(needed > buf_end - buf){ \
	av_log(avctx, AV_LOG_ERROR, "Problem: unexpected end of data while reading " where "\n"); \
	return -1; \
	} \

	static int targa_decode_rle(AVCodecContext avctx, TargaContext s, const uint8_t src, int src_size, uint8_t dst, int w, int h, int stride, int bpp)
	{
	int i, x, y;
	int depth = (bpp + 1) >> 3;
	int type, count;
	int diff;
	const uint8_t *src_end = src + src_size;

	diff = stride - w * depth;
	x = y = 0;
	while(y < h){
	CHECK_BUFFER_SIZE(src, src_end, 1, "image type");
	type = *src++;
	count = (type & 0x7F) + 1;
	type &= 0x80;
	if((x + count > w) && (x + count + 1 > (h - y) * w)){
	av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds: position (%i,%i) size %i\n", x, y, count);
	return -1;
	}
	if(type){
	CHECK_BUFFER_SIZE(src, src_end, depth, "image data");
	}else{
	CHECK_BUFFER_SIZE(src, src_end, count * depth, "image data");
	}
	for(i = 0; i < count; i++){
	switch(depth){
	case 1:
	dst = src;
	break;
	case 2:
	AV_WN16A(dst, AV_RN16A(src));
	break;
	case 3:
	dst[0] = src[0];
	dst[1] = src[1];
	dst[2] = src[2];
	break;
	case 4:
	AV_WN32A(dst, AV_RN32A(src));
	break;
	}
	dst += depth;
	if(!type)
	src += depth;

	x++;
	if(x == w){
	x = 0;
	y++;
	dst += diff;
	}
	}
	if(type)
	src += depth;
	}
	return src_size;
	}

	static int decode_frame(AVCodecContext *avctx,
	void data, int data_size,
	AVPacket *avpkt)
	{
	const uint8_t *buf = avpkt->data;
	const uint8_t *buf_end = avpkt->data + avpkt->size;
	TargaContext * const s = avctx->priv_data;
	AVFrame *picture = data;
	AVFrame * const p= (AVFrame*)&s->picture;
	uint8_t *dst;
	int stride;
	int idlen, pal, compr, y, w, h, bpp, flags;
	int first_clr, colors, csize;

	/* parse image header */
	CHECK_BUFFER_SIZE(buf, buf_end, 18, "header");
	idlen = *buf++;
	pal = *buf++;
	compr = *buf++;
	first_clr = bytestream_get_le16(&buf);
	colors = bytestream_get_le16(&buf);
	csize = *buf++;
	if (!pal && (first_clr \|\| colors \|\| csize)) {
	av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
	// specification says we should ignore those value in this case
	first_clr = colors = csize = 0;
	}
	buf += 2; /* x */
	y = bytestream_get_le16(&buf);
	w = bytestream_get_le16(&buf);
	h = bytestream_get_le16(&buf);
	bpp = *buf++;
	flags = *buf++;
	//skip identifier if any
	CHECK_BUFFER_SIZE(buf, buf_end, idlen, "identifiers");
	buf += idlen;
	s->bpp = bpp;
	s->width = w;
	s->height = h;
	switch(s->bpp){
	case 8:
	avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? PIX_FMT_GRAY8 : PIX_FMT_PAL8;
	break;
	case 15:
	case 16:
	avctx->pix_fmt = PIX_FMT_RGB555LE;
	break;
	case 24:
	avctx->pix_fmt = PIX_FMT_BGR24;
	break;
	case 32:
	avctx->pix_fmt = PIX_FMT_BGRA;
	break;
	default:
	av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", s->bpp);
	return -1;
	}

	if(s->picture.data[0])
	avctx->release_buffer(avctx, &s->picture);

	if(av_image_check_size(w, h, 0, avctx))
	return -1;
	if(w != avctx->width \|\| h != avctx->height)
	avcodec_set_dimensions(avctx, w, h);
	if(avctx->get_buffer(avctx, p) < 0){
	av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
	return -1;
	}
	if(flags & 0x20){
	dst = p->data[0];
	stride = p->linesize[0];
	}else{ //image is upside-down
	dst = p->data[0] + p->linesize[0] * (h - 1);
	stride = -p->linesize[0];
	}

	if(colors){
	int pal_size, pal_sample_size;
	if((colors + first_clr) > 256){
	av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
	return -1;
	}
	switch (csize) {
	case 24: pal_sample_size = 3; break;
	case 16:
	case 15: pal_sample_size = 2; break;
	default:
	av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
	return -1;
	}
	pal_size = colors * pal_sample_size;
	CHECK_BUFFER_SIZE(buf, buf_end, pal_size, "color table");
	if(avctx->pix_fmt != PIX_FMT_PAL8)//should not occur but skip palette anyway
	buf += pal_size;
	else{
	int t;
	uint32_t pal = ((uint32_t )p->data[1]) + first_clr;

	switch (pal_sample_size) {
	case 3:
	/* RGB24 */
	for (t = 0; t < colors; t++)
	*pal++ = (0xffU<<24) \| bytestream_get_le24(&buf);
	break;
	case 2:
	/* RGB555 */
	for (t = 0; t < colors; t++) {
	uint32_t v = bytestream_get_le16(&buf);
	v = ((v & 0x7C00) << 9) \|
	((v & 0x03E0) << 6) \|
	((v & 0x001F) << 3);
	/* left bit replication */
	v \|= (v & 0xE0E0E0U) >> 5;
	*pal++ = (0xffU<<24) \| v;
	}
	break;
	}
	p->palette_has_changed = 1;
	}
	}
	if((compr & (~TGA_RLE)) == TGA_NODATA)
	memset(p->data[0], 0, p->linesize[0] * s->height);
	else{
	if(compr & TGA_RLE){
	int res = targa_decode_rle(avctx, s, buf, buf_end - buf, dst, avctx->width, avctx->height, stride, bpp);
	if (res < 0)
	return -1;
	buf += res;
	}else{
	size_t img_size = s->width * ((s->bpp + 1) >> 3);
	CHECK_BUFFER_SIZE(buf, buf_end, img_size, "image data");
	for(y = 0; y < s->height; y++){
	memcpy(dst, buf, img_size);

	dst += stride;
	buf += img_size;
	}
	}
	}
	if(flags & 0x10){ // right-to-left, needs horizontal flip
	int x;
	for(y = 0; y < s->height; y++){
	void line = &p->data[0][y p->linesize[0]];
	for(x = 0; x < s->width >> 1; x++){
	switch(s->bpp){
	case 32:
	FFSWAP(uint32_t, ((uint32_t )line)[x], ((uint32_t )line)[s->width - x - 1]);
	break;
	case 24:
	FFSWAP(uint8_t, ((uint8_t )line)[3 x ], ((uint8_t )line)[3 s->width - 3 * x - 3]);
	FFSWAP(uint8_t, ((uint8_t )line)[3 x + 1], ((uint8_t )line)[3 s->width - 3 * x - 2]);
	FFSWAP(uint8_t, ((uint8_t )line)[3 x + 2], ((uint8_t )line)[3 s->width - 3 * x - 1]);
	break;
	case 16:
	FFSWAP(uint16_t, ((uint16_t )line)[x], ((uint16_t )line)[s->width - x - 1]);
	break;
	case 8:
	FFSWAP(uint8_t, ((uint8_t )line)[x], ((uint8_t )line)[s->width - x - 1]);
	}
	}
	}
	}

	picture= (AVFrame*)&s->picture;
	*data_size = sizeof(AVPicture);

	return avpkt->size;
	}

	static av_cold int targa_init(AVCodecContext *avctx){
	TargaContext *s = avctx->priv_data;

	avcodec_get_frame_defaults((AVFrame*)&s->picture);
	avctx->coded_frame= (AVFrame*)&s->picture;

	return 0;
	}

	static av_cold int targa_end(AVCodecContext *avctx){
	TargaContext *s = avctx->priv_data;

	if(s->picture.data[0])
	avctx->release_buffer(avctx, &s->picture);

	return 0;
	}

	AVCodec ff_targa_decoder = {
	.name = "targa",
	.type = AVMEDIA_TYPE_VIDEO,
	.id = CODEC_ID_TARGA,
	.priv_data_size = sizeof(TargaContext),
	.init = targa_init,
	.close = targa_end,
	.decode = decode_frame,
	.capabilities = CODEC_CAP_DR1,
	.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
	};