yading@10: /*
yading@10:  * Targa (.tga) image decoder
yading@10:  * Copyright (c) 2006 Konstantin Shishkov
yading@10:  *
yading@10:  * This file is part of FFmpeg.
yading@10:  *
yading@10:  * FFmpeg is free software; you can redistribute it and/or
yading@10:  * modify it under the terms of the GNU Lesser General Public
yading@10:  * License as published by the Free Software Foundation; either
yading@10:  * version 2.1 of the License, or (at your option) any later version.
yading@10:  *
yading@10:  * FFmpeg is distributed in the hope that it will be useful,
yading@10:  * but WITHOUT ANY WARRANTY; without even the implied warranty of
yading@10:  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
yading@10:  * Lesser General Public License for more details.
yading@10:  *
yading@10:  * You should have received a copy of the GNU Lesser General Public
yading@10:  * License along with FFmpeg; if not, write to the Free Software
yading@10:  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
yading@10:  */
yading@10: 
yading@10: #include "libavutil/intreadwrite.h"
yading@10: #include "libavutil/imgutils.h"
yading@10: #include "avcodec.h"
yading@10: #include "bytestream.h"
yading@10: #include "internal.h"
yading@10: #include "targa.h"
yading@10: 
yading@10: typedef struct TargaContext {
yading@10:     GetByteContext gb;
yading@10: } TargaContext;
yading@10: 
yading@10: static uint8_t *advance_line(uint8_t *start, uint8_t *line,
yading@10:                              int stride, int *y, int h, int interleave)
yading@10: {
yading@10:     *y += interleave;
yading@10: 
yading@10:     if (*y < h) {
yading@10:         return line + interleave * stride;
yading@10:     } else {
yading@10:         *y = (*y + 1) & (interleave - 1);
yading@10:         if (*y && *y < h) {
yading@10:             return start + *y * stride;
yading@10:         } else {
yading@10:             return NULL;
yading@10:         }
yading@10:     }
yading@10: }
yading@10: 
yading@10: static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
yading@10:                             uint8_t *start, int w, int h, int stride,
yading@10:                             int bpp, int interleave)
yading@10: {
yading@10:     int x, y;
yading@10:     int depth = (bpp + 1) >> 3;
yading@10:     int type, count;
yading@10:     uint8_t *line = start;
yading@10:     uint8_t *dst  = line;
yading@10: 
yading@10:     x = y = count = 0;
yading@10:     while (dst) {
yading@10:         if (bytestream2_get_bytes_left(&s->gb) <= 0) {
yading@10:             av_log(avctx, AV_LOG_ERROR,
yading@10:                    "Ran ouf of data before end-of-image\n");
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         type  = bytestream2_get_byteu(&s->gb);
yading@10:         count = (type & 0x7F) + 1;
yading@10:         type &= 0x80;
yading@10:         if (!type) {
yading@10:             do {
yading@10:                 int n  = FFMIN(count, w - x);
yading@10:                 bytestream2_get_buffer(&s->gb, dst, n * depth);
yading@10:                 count -= n;
yading@10:                 dst   += n * depth;
yading@10:                 x     += n;
yading@10:                 if (x == w) {
yading@10:                     x    = 0;
yading@10:                     dst = line = advance_line(start, line, stride, &y, h, interleave);
yading@10:                 }
yading@10:             } while (dst && count > 0);
yading@10:         } else {
yading@10:             uint8_t tmp[4];
yading@10:             bytestream2_get_buffer(&s->gb, tmp, depth);
yading@10:             do {
yading@10:                 int n  = FFMIN(count, w - x);
yading@10:                 count -= n;
yading@10:                 x     += n;
yading@10:                 do {
yading@10:                     memcpy(dst, tmp, depth);
yading@10:                     dst += depth;
yading@10:                 } while (--n);
yading@10:                 if (x == w) {
yading@10:                     x    = 0;
yading@10:                     dst = line = advance_line(start, line, stride, &y, h, interleave);
yading@10:                 }
yading@10:             } while (dst && count > 0);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (count) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     return 0;
yading@10: }
yading@10: 
yading@10: static int decode_frame(AVCodecContext *avctx,
yading@10:                         void *data, int *got_frame,
yading@10:                         AVPacket *avpkt)
yading@10: {
yading@10:     TargaContext * const s = avctx->priv_data;
yading@10:     AVFrame * const p = data;
yading@10:     uint8_t *dst;
yading@10:     int stride;
yading@10:     int idlen, pal, compr, y, w, h, bpp, flags, ret;
yading@10:     int first_clr, colors, csize;
yading@10:     int interleave;
yading@10: 
yading@10:     bytestream2_init(&s->gb, avpkt->data, avpkt->size);
yading@10: 
yading@10:     /* parse image header */
yading@10:     idlen     = bytestream2_get_byte(&s->gb);
yading@10:     pal       = bytestream2_get_byte(&s->gb);
yading@10:     compr     = bytestream2_get_byte(&s->gb);
yading@10:     first_clr = bytestream2_get_le16(&s->gb);
yading@10:     colors    = bytestream2_get_le16(&s->gb);
yading@10:     csize     = bytestream2_get_byte(&s->gb);
yading@10:     bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
yading@10:     w         = bytestream2_get_le16(&s->gb);
yading@10:     h         = bytestream2_get_le16(&s->gb);
yading@10:     bpp       = bytestream2_get_byte(&s->gb);
yading@10: 
yading@10:     if (bytestream2_get_bytes_left(&s->gb) <= idlen) {
yading@10:         av_log(avctx, AV_LOG_ERROR,
yading@10:                 "Not enough data to read header\n");
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     flags     = bytestream2_get_byte(&s->gb);
yading@10: 
yading@10:     if (!pal && (first_clr || colors || csize)) {
yading@10:         av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
yading@10:         // specification says we should ignore those value in this case
yading@10:         first_clr = colors = csize = 0;
yading@10:     }
yading@10: 
yading@10:     // skip identifier if any
yading@10:     bytestream2_skip(&s->gb, idlen);
yading@10: 
yading@10:     switch (bpp) {
yading@10:     case 8:
yading@10:         avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
yading@10:         break;
yading@10:     case 15:
yading@10:     case 16:
yading@10:         avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
yading@10:         break;
yading@10:     case 24:
yading@10:         avctx->pix_fmt = AV_PIX_FMT_BGR24;
yading@10:         break;
yading@10:     case 32:
yading@10:         avctx->pix_fmt = AV_PIX_FMT_BGRA;
yading@10:         break;
yading@10:     default:
yading@10:         av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if (colors && (colors + first_clr) > 256) {
yading@10:         av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr);
yading@10:         return AVERROR_INVALIDDATA;
yading@10:     }
yading@10: 
yading@10:     if ((ret = av_image_check_size(w, h, 0, avctx)) < 0)
yading@10:         return ret;
yading@10:     if (w != avctx->width || h != avctx->height)
yading@10:         avcodec_set_dimensions(avctx, w, h);
yading@10:     if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
yading@10:         return ret;
yading@10: 
yading@10:     if (flags & TGA_TOPTOBOTTOM) {
yading@10:         dst = p->data[0];
yading@10:         stride = p->linesize[0];
yading@10:     } else { //image is upside-down
yading@10:         dst = p->data[0] + p->linesize[0] * (h - 1);
yading@10:         stride = -p->linesize[0];
yading@10:     }
yading@10: 
yading@10:     interleave = flags & TGA_INTERLEAVE2 ? 2 :
yading@10:                  flags & TGA_INTERLEAVE4 ? 4 : 1;
yading@10: 
yading@10:     if (colors) {
yading@10:         int pal_size, pal_sample_size;
yading@10: 
yading@10:         switch (csize) {
yading@10:         case 32: pal_sample_size = 4; break;
yading@10:         case 24: pal_sample_size = 3; break;
yading@10:         case 16:
yading@10:         case 15: pal_sample_size = 2; break;
yading@10:         default:
yading@10:             av_log(avctx, AV_LOG_ERROR, "Palette entry size %i bits is not supported\n", csize);
yading@10:             return AVERROR_INVALIDDATA;
yading@10:         }
yading@10:         pal_size = colors * pal_sample_size;
yading@10:         if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
yading@10:             bytestream2_skip(&s->gb, pal_size);
yading@10:         else {
yading@10:             int t;
yading@10:             uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
yading@10: 
yading@10:             if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
yading@10:                 av_log(avctx, AV_LOG_ERROR,
yading@10:                        "Not enough data to read palette\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10:             switch (pal_sample_size) {
yading@10:             case 4:
yading@10:                 for (t = 0; t < colors; t++)
yading@10:                     *pal++ = bytestream2_get_le32u(&s->gb);
yading@10:                 break;
yading@10:             case 3:
yading@10:                 /* RGB24 */
yading@10:                 for (t = 0; t < colors; t++)
yading@10:                     *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
yading@10:                 break;
yading@10:             case 2:
yading@10:                 /* RGB555 */
yading@10:                 for (t = 0; t < colors; t++) {
yading@10:                     uint32_t v = bytestream2_get_le16u(&s->gb);
yading@10:                     v = ((v & 0x7C00) <<  9) |
yading@10:                         ((v & 0x03E0) <<  6) |
yading@10:                         ((v & 0x001F) <<  3);
yading@10:                     /* left bit replication */
yading@10:                     v |= (v & 0xE0E0E0U) >> 5;
yading@10:                     *pal++ = (0xffU<<24) | v;
yading@10:                 }
yading@10:                 break;
yading@10:             }
yading@10:             p->palette_has_changed = 1;
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if ((compr & (~TGA_RLE)) == TGA_NODATA) {
yading@10:         memset(p->data[0], 0, p->linesize[0] * h);
yading@10:     } else {
yading@10:         if (compr & TGA_RLE) {
yading@10:             int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
yading@10:             if (res < 0)
yading@10:                 return res;
yading@10:         } else {
yading@10:             size_t img_size = w * ((bpp + 1) >> 3);
yading@10:             uint8_t *line;
yading@10:             if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
yading@10:                 av_log(avctx, AV_LOG_ERROR,
yading@10:                        "Not enough data available for image\n");
yading@10:                 return AVERROR_INVALIDDATA;
yading@10:             }
yading@10: 
yading@10:             line = dst;
yading@10:             y = 0;
yading@10:             do {
yading@10:                 bytestream2_get_buffer(&s->gb, line, img_size);
yading@10:                 line = advance_line(dst, line, stride, &y, h, interleave);
yading@10:             } while (line);
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
yading@10:         int x;
yading@10:         for (y = 0; y < h; y++) {
yading@10:             void *line = &p->data[0][y * p->linesize[0]];
yading@10:             for (x = 0; x < w >> 1; x++) {
yading@10:                 switch (bpp) {
yading@10:                 case 32:
yading@10:                     FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
yading@10:                     break;
yading@10:                 case 24:
yading@10:                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x    ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
yading@10:                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
yading@10:                     FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
yading@10:                     break;
yading@10:                 case 16:
yading@10:                     FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
yading@10:                     break;
yading@10:                 case 8:
yading@10:                     FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
yading@10:                 }
yading@10:             }
yading@10:         }
yading@10:     }
yading@10: 
yading@10:     *got_frame = 1;
yading@10: 
yading@10:     return avpkt->size;
yading@10: }
yading@10: 
yading@10: AVCodec ff_targa_decoder = {
yading@10:     .name           = "targa",
yading@10:     .type           = AVMEDIA_TYPE_VIDEO,
yading@10:     .id             = AV_CODEC_ID_TARGA,
yading@10:     .priv_data_size = sizeof(TargaContext),
yading@10:     .decode         = decode_frame,
yading@10:     .capabilities   = CODEC_CAP_DR1,
yading@10:     .long_name      = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
yading@10: };