| /* | |
| * 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 "avcodec.h" | |
| #include "bytestream.h" | |
| #include "codec_internal.h" | |
| #include "decode.h" | |
| #include "targa.h" | |
| typedef struct TargaContext { | |
| GetByteContext gb; | |
| } TargaContext; | |
| static uint8_t *advance_line(uint8_t *start, uint8_t *line, | |
| int stride, int *y, int h, int interleave) | |
| { | |
| *y += interleave; | |
| if (*y < h) { | |
| return line + interleave * stride; | |
| } else { | |
| *y = (*y + 1) & (interleave - 1); | |
| if (*y && *y < h) { | |
| return start + *y * stride; | |
| } else { | |
| return NULL; | |
| } | |
| } | |
| } | |
| static int targa_decode_rle(AVCodecContext *avctx, TargaContext *s, | |
| uint8_t *start, int w, int h, int stride, | |
| int bpp, int interleave) | |
| { | |
| int x, y; | |
| int depth = (bpp + 1) >> 3; | |
| int type, count; | |
| uint8_t *line = start; | |
| uint8_t *dst = line; | |
| x = y = count = 0; | |
| while (dst) { | |
| if (bytestream2_get_bytes_left(&s->gb) <= 0) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Ran ouf of data before end-of-image\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| type = bytestream2_get_byteu(&s->gb); | |
| count = (type & 0x7F) + 1; | |
| type &= 0x80; | |
| if (!type) { | |
| do { | |
| int n = FFMIN(count, w - x); | |
| bytestream2_get_buffer(&s->gb, dst, n * depth); | |
| count -= n; | |
| dst += n * depth; | |
| x += n; | |
| if (x == w) { | |
| x = 0; | |
| dst = line = advance_line(start, line, stride, &y, h, interleave); | |
| } | |
| } while (dst && count > 0); | |
| } else { | |
| uint8_t tmp[4]; | |
| bytestream2_get_buffer(&s->gb, tmp, depth); | |
| do { | |
| int n = FFMIN(count, w - x); | |
| count -= n; | |
| x += n; | |
| do { | |
| memcpy(dst, tmp, depth); | |
| dst += depth; | |
| } while (--n); | |
| if (x == w) { | |
| x = 0; | |
| dst = line = advance_line(start, line, stride, &y, h, interleave); | |
| } | |
| } while (dst && count > 0); | |
| } | |
| } | |
| if (count) { | |
| av_log(avctx, AV_LOG_ERROR, "Packet went out of bounds\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| return 0; | |
| } | |
| static int decode_frame(AVCodecContext *avctx, AVFrame *p, | |
| int *got_frame, AVPacket *avpkt) | |
| { | |
| TargaContext * const s = avctx->priv_data; | |
| uint8_t *dst; | |
| int stride; | |
| int idlen, pal, compr, y, w, h, bpp, flags, ret; | |
| int first_clr, colors, csize; | |
| int interleave; | |
| size_t img_size; | |
| bytestream2_init(&s->gb, avpkt->data, avpkt->size); | |
| /* parse image header */ | |
| idlen = bytestream2_get_byte(&s->gb); | |
| pal = bytestream2_get_byte(&s->gb); | |
| compr = bytestream2_get_byte(&s->gb); | |
| first_clr = bytestream2_get_le16(&s->gb); | |
| colors = bytestream2_get_le16(&s->gb); | |
| csize = bytestream2_get_byte(&s->gb); | |
| bytestream2_skip(&s->gb, 4); /* 2: x, 2: y */ | |
| w = bytestream2_get_le16(&s->gb); | |
| h = bytestream2_get_le16(&s->gb); | |
| bpp = bytestream2_get_byte(&s->gb); | |
| flags = bytestream2_get_byte(&s->gb); | |
| 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; | |
| } | |
| if (bytestream2_get_bytes_left(&s->gb) < idlen + 2*colors) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Not enough data to read header\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| // skip identifier if any | |
| bytestream2_skip(&s->gb, idlen); | |
| switch (bpp) { | |
| case 8: | |
| avctx->pix_fmt = ((compr & (~TGA_RLE)) == TGA_BW) ? AV_PIX_FMT_GRAY8 : AV_PIX_FMT_PAL8; | |
| break; | |
| case 15: | |
| case 16: | |
| avctx->pix_fmt = AV_PIX_FMT_RGB555LE; | |
| break; | |
| case 24: | |
| avctx->pix_fmt = AV_PIX_FMT_BGR24; | |
| break; | |
| case 32: | |
| avctx->pix_fmt = AV_PIX_FMT_BGRA; | |
| break; | |
| default: | |
| av_log(avctx, AV_LOG_ERROR, "Bit depth %i is not supported\n", bpp); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if (colors && (colors + first_clr) > 256) { | |
| av_log(avctx, AV_LOG_ERROR, "Incorrect palette: %i colors with offset %i\n", colors, first_clr); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| if ((ret = ff_set_dimensions(avctx, w, h)) < 0) | |
| return ret; | |
| if ((compr & (~TGA_RLE)) == TGA_NODATA) { | |
| return avpkt->size; | |
| } | |
| if (!(compr & TGA_RLE)) { | |
| img_size = w * ((bpp + 1) >> 3); | |
| if (bytestream2_get_bytes_left(&s->gb) < img_size * h) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Not enough data available for image\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| } | |
| if ((ret = ff_get_buffer(avctx, p, 0)) < 0) | |
| return ret; | |
| p->pict_type = AV_PICTURE_TYPE_I; | |
| if (flags & TGA_TOPTOBOTTOM) { | |
| 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]; | |
| } | |
| interleave = flags & TGA_INTERLEAVE2 ? 2 : | |
| flags & TGA_INTERLEAVE4 ? 4 : 1; | |
| if (colors) { | |
| int pal_size, pal_sample_size; | |
| switch (csize) { | |
| case 32: pal_sample_size = 4; break; | |
| 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 AVERROR_INVALIDDATA; | |
| } | |
| pal_size = colors * pal_sample_size; | |
| if (avctx->pix_fmt != AV_PIX_FMT_PAL8) //should not occur but skip palette anyway | |
| bytestream2_skip(&s->gb, pal_size); | |
| else { | |
| int t; | |
| uint32_t *pal = ((uint32_t *)p->data[1]) + first_clr; | |
| if (bytestream2_get_bytes_left(&s->gb) < pal_size) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Not enough data to read palette\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| switch (pal_sample_size) { | |
| case 4: | |
| for (t = 0; t < colors; t++) | |
| *pal++ = bytestream2_get_le32u(&s->gb); | |
| break; | |
| case 3: | |
| /* RGB24 */ | |
| for (t = 0; t < colors; t++) | |
| *pal++ = (0xffU<<24) | bytestream2_get_le24u(&s->gb); | |
| break; | |
| case 2: | |
| /* RGB555 */ | |
| for (t = 0; t < colors; t++) { | |
| uint32_t v = bytestream2_get_le16u(&s->gb); | |
| v = ((v & 0x7C00) << 9) | | |
| ((v & 0x03E0) << 6) | | |
| ((v & 0x001F) << 3); | |
| /* left bit replication */ | |
| v |= (v & 0xE0E0E0U) >> 5; | |
| *pal++ = (0xffU<<24) | v; | |
| } | |
| break; | |
| } | |
| #if FF_API_PALETTE_HAS_CHANGED | |
| FF_DISABLE_DEPRECATION_WARNINGS | |
| p->palette_has_changed = 1; | |
| FF_ENABLE_DEPRECATION_WARNINGS | |
| #endif | |
| } | |
| } | |
| if (compr & TGA_RLE) { | |
| int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave); | |
| if (res < 0) | |
| return res; | |
| } else { | |
| uint8_t *line; | |
| if (bytestream2_get_bytes_left(&s->gb) < img_size * h) { | |
| av_log(avctx, AV_LOG_ERROR, | |
| "Not enough data available for image\n"); | |
| return AVERROR_INVALIDDATA; | |
| } | |
| line = dst; | |
| y = 0; | |
| do { | |
| bytestream2_get_buffer(&s->gb, line, img_size); | |
| line = advance_line(dst, line, stride, &y, h, interleave); | |
| } while (line); | |
| } | |
| if (flags & TGA_RIGHTTOLEFT) { // right-to-left, needs horizontal flip | |
| for (int y = 0; y < h; y++) { | |
| void *line = &p->data[0][y * p->linesize[0]]; | |
| for (int x = 0; x < w >> 1; x++) { | |
| switch (bpp) { | |
| case 32: | |
| FFSWAP(uint32_t, ((uint32_t *)line)[x], ((uint32_t *)line)[w - x - 1]); | |
| break; | |
| case 24: | |
| FFSWAP(uint8_t, ((uint8_t *)line)[3 * x ], ((uint8_t *)line)[3 * w - 3 * x - 3]); | |
| FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 1], ((uint8_t *)line)[3 * w - 3 * x - 2]); | |
| FFSWAP(uint8_t, ((uint8_t *)line)[3 * x + 2], ((uint8_t *)line)[3 * w - 3 * x - 1]); | |
| break; | |
| case 16: | |
| FFSWAP(uint16_t, ((uint16_t *)line)[x], ((uint16_t *)line)[w - x - 1]); | |
| break; | |
| case 8: | |
| FFSWAP(uint8_t, ((uint8_t *)line)[x], ((uint8_t *)line)[w - x - 1]); | |
| } | |
| } | |
| } | |
| } | |
| *got_frame = 1; | |
| return avpkt->size; | |
| } | |
| const FFCodec ff_targa_decoder = { | |
| .p.name = "targa", | |
| CODEC_LONG_NAME("Truevision Targa image"), | |
| .p.type = AVMEDIA_TYPE_VIDEO, | |
| .p.id = AV_CODEC_ID_TARGA, | |
| .p.capabilities = AV_CODEC_CAP_DR1, | |
| .priv_data_size = sizeof(TargaContext), | |
| FF_CODEC_DECODE_CB(decode_frame), | |
| }; |