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309 lines
10 KiB
C
309 lines
10 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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#include "libavutil/intreadwrite.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "bytestream.h"
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#include "internal.h"
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#include "targa.h"
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typedef struct TargaContext {
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GetByteContext gb;
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} TargaContext;
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static uint8_t *advance_line(uint8_t *start, uint8_t *line,
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int stride, int *y, int h, int interleave)
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{
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*y += interleave;
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if (*y < h) {
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return line + interleave * stride;
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} else {
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*y = (*y + 1) & (interleave - 1);
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if (*y && *y < h) {
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return start + *y * stride;
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} else {
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return NULL;
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}
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}
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}
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static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s,
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uint8_t *start, int w, int h, int stride,
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int bpp, int interleave)
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{
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int x, y;
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int depth = (bpp + 1) >> 3;
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int type, count;
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uint8_t *line = start;
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uint8_t *dst = line;
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x = y = count = 0;
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while (dst) {
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if (bytestream2_get_bytes_left(&s->gb) <= 0) {
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av_log(avctx, AV_LOG_ERROR,
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"Ran ouf of data before end-of-image\n");
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return AVERROR_INVALIDDATA;
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}
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type = bytestream2_get_byteu(&s->gb);
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count = (type & 0x7F) + 1;
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type &= 0x80;
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if (!type) {
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do {
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int n = FFMIN(count, w - x);
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bytestream2_get_buffer(&s->gb, dst, n * depth);
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count -= n;
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dst += n * depth;
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x += n;
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if (x == w) {
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x = 0;
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dst = line = advance_line(start, line, stride, &y, h, interleave);
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}
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} while (dst && count > 0);
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} else {
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uint8_t tmp[4];
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bytestream2_get_buffer(&s->gb, tmp, depth);
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do {
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int n = FFMIN(count, w - x);
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count -= n;
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x += n;
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do {
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memcpy(dst, tmp, depth);
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dst += depth;
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} while (--n);
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if (x == w) {
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x = 0;
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dst = line = advance_line(start, line, stride, &y, h, interleave);
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}
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} while (dst && count > 0);
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}
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}
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if (count) {
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av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n");
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return AVERROR_INVALIDDATA;
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}
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return 0;
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}
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static int decode_frame(AVCodecContext *avctx,
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void *data, int *got_frame,
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AVPacket *avpkt)
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{
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TargaContext * const s = avctx->priv_data;
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AVFrame * const p = data;
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uint8_t *dst;
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int stride;
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int idlen, pal, compr, y, w, h, bpp, flags, ret;
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int first_clr, colors, csize;
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int interleave;
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bytestream2_init(&s->gb, avpkt->data, avpkt->size);
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/* parse image header */
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idlen = bytestream2_get_byte(&s->gb);
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pal = bytestream2_get_byte(&s->gb);
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compr = bytestream2_get_byte(&s->gb);
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first_clr = bytestream2_get_le16(&s->gb);
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colors = bytestream2_get_le16(&s->gb);
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csize = bytestream2_get_byte(&s->gb);
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bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */
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w = bytestream2_get_le16(&s->gb);
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h = bytestream2_get_le16(&s->gb);
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bpp = bytestream2_get_byte(&s->gb);
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flags = bytestream2_get_byte(&s->gb);
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if (!pal && (first_clr || colors || csize)) {
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av_log(avctx, AV_LOG_WARNING, "File without colormap has colormap information set.\n");
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// specification says we should ignore those value in this case
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first_clr = colors = csize = 0;
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}
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if (bytestream2_get_bytes_left(&s->gb) < idlen + 2*colors) {
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av_log(avctx, AV_LOG_ERROR,
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"Not enough data to read header\n");
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return AVERROR_INVALIDDATA;
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}
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// skip identifier if any
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bytestream2_skip(&s->gb, idlen);
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switch (bpp) {
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case 8:
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avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8;
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break;
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case 15:
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case 16:
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avctx->pix_fmt = AV_PIX_FMT_RGB555LE;
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break;
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case 24:
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avctx->pix_fmt = AV_PIX_FMT_BGR24;
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break;
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case 32:
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avctx->pix_fmt = AV_PIX_FMT_BGRA;
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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", bpp);
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return AVERROR_INVALIDDATA;
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}
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if (colors && (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 AVERROR_INVALIDDATA;
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}
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if ((ret = ff_set_dimensions(avctx, w, h)) < 0)
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return ret;
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if ((ret = ff_get_buffer(avctx, p, 0)) < 0)
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return ret;
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p->pict_type = AV_PICTURE_TYPE_I;
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if (flags & TGA_TOPTOBOTTOM) {
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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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interleave = flags & TGA_INTERLEAVE2 ? 2 :
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flags & TGA_INTERLEAVE4 ? 4 : 1;
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if (colors) {
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int pal_size, pal_sample_size;
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switch (csize) {
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case 32: pal_sample_size = 4; break;
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case 24: pal_sample_size = 3; break;
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case 16:
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case 15: pal_sample_size = 2; break;
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default:
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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 AVERROR_INVALIDDATA;
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}
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pal_size = colors * pal_sample_size;
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if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway
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bytestream2_skip(&s->gb, pal_size);
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else {
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int t;
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uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr;
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if (bytestream2_get_bytes_left(&s->gb) < pal_size) {
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av_log(avctx, AV_LOG_ERROR,
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"Not enough data to read palette\n");
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return AVERROR_INVALIDDATA;
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}
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switch (pal_sample_size) {
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case 4:
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for (t = 0; t < colors; t++)
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*pal++ = bytestream2_get_le32u(&s->gb);
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break;
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case 3:
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/* RGB24 */
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for (t = 0; t < colors; t++)
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*pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb);
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break;
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case 2:
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/* RGB555 */
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for (t = 0; t < colors; t++) {
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uint32_t v = bytestream2_get_le16u(&s->gb);
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v = ((v & 0x7C00) << 9) |
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((v & 0x03E0) << 6) |
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((v & 0x001F) << 3);
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/* left bit replication */
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v |= (v & 0xE0E0E0U) >> 5;
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*pal++ = (0xffU<<24) | v;
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}
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break;
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}
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p->palette_has_changed = 1;
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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] * h);
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} else {
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if (compr & TGA_RLE) {
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int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave);
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if (res < 0)
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return res;
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} else {
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size_t img_size = w * ((bpp + 1) >> 3);
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uint8_t *line;
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if (bytestream2_get_bytes_left(&s->gb) < img_size * h) {
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av_log(avctx, AV_LOG_ERROR,
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"Not enough data available for image\n");
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return AVERROR_INVALIDDATA;
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}
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line = dst;
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y = 0;
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do {
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bytestream2_get_buffer(&s->gb, line, img_size);
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line = advance_line(dst, line, stride, &y, h, interleave);
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} while (line);
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}
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if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip
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int x;
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for (y = 0; y < h; y++) {
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void *line = &p->data[0][y * p->linesize[0]];
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for (x = 0; x < w >> 1; x++) {
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switch (bpp) {
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case 32:
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FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]);
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break;
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case 24:
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FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]);
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FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]);
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FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]);
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break;
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case 16:
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FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]);
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break;
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case 8:
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FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]);
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}
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}
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}
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}
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}
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*got_frame = 1;
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return avpkt->size;
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}
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AVCodec ff_targa_decoder = {
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.name = "targa",
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.long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"),
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.type = AVMEDIA_TYPE_VIDEO,
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.id = AV_CODEC_ID_TARGA,
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.priv_data_size = sizeof(TargaContext),
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.decode = decode_frame,
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.capabilities = AV_CODEC_CAP_DR1,
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};
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