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Diffstat (limited to 'ffmpeg1/libavcodec/targa.c')
| -rw-r--r-- | ffmpeg1/libavcodec/targa.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/ffmpeg1/libavcodec/targa.c b/ffmpeg1/libavcodec/targa.c new file mode 100644 index 0000000..ff4390f --- /dev/null +++ b/ffmpeg1/libavcodec/targa.c @@ -0,0 +1,307 @@ +/* + * 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 "internal.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, + void *data, int *got_frame, + AVPacket *avpkt) +{ + TargaContext * const s = avctx->priv_data; + AVFrame * const p = data; + uint8_t *dst; + int stride; + int idlen, pal, compr, y, w, h, bpp, flags, ret; + int first_clr, colors, csize; + int interleave; + + 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); + + if (bytestream2_get_bytes_left(&s->gb) <= idlen) { + av_log(avctx, AV_LOG_ERROR, + "Not enough data to read header\n"); + return AVERROR_INVALIDDATA; + } + + 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; + } + + // 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 = av_image_check_size(w, h, 0, avctx)) < 0) + return ret; + if (w != avctx->width || h != avctx->height) + avcodec_set_dimensions(avctx, w, h); + if ((ret = ff_get_buffer(avctx, p, 0)) < 0) + return ret; + + 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; + } + p->palette_has_changed = 1; + } + } + + if ((compr & (~TGA_RLE)) == TGA_NODATA) { + memset(p->data[0], 0, p->linesize[0] * h); + } else { + if (compr & TGA_RLE) { + int res = targa_decode_rle(avctx, s, dst, w, h, stride, bpp, interleave); + if (res < 0) + return res; + } else { + size_t img_size = w * ((bpp + 1) >> 3); + 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 + int x; + for (y = 0; y < h; y++) { + void *line = &p->data[0][y * p->linesize[0]]; + for (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; +} + +AVCodec ff_targa_decoder = { + .name = "targa", + .type = AVMEDIA_TYPE_VIDEO, + .id = AV_CODEC_ID_TARGA, + .priv_data_size = sizeof(TargaContext), + .decode = decode_frame, + .capabilities = CODEC_CAP_DR1, + .long_name = NULL_IF_CONFIG_SMALL("Truevision Targa image"), +}; |