diff options
Diffstat (limited to 'ffmpeg1/libavcodec/xsubdec.c')
| -rw-r--r-- | ffmpeg1/libavcodec/xsubdec.c | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/ffmpeg1/libavcodec/xsubdec.c b/ffmpeg1/libavcodec/xsubdec.c deleted file mode 100644 index d3367b0..0000000 --- a/ffmpeg1/libavcodec/xsubdec.c +++ /dev/null @@ -1,145 +0,0 @@ -/* - * XSUB subtitle decoder - * Copyright (c) 2007 Reimar Döffinger - * - * 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/mathematics.h" -#include "libavutil/imgutils.h" -#include "avcodec.h" -#include "get_bits.h" -#include "bytestream.h" - -static av_cold int decode_init(AVCodecContext *avctx) { - avctx->pix_fmt = AV_PIX_FMT_PAL8; - return 0; -} - -static const uint8_t tc_offsets[9] = { 0, 1, 3, 4, 6, 7, 9, 10, 11 }; -static const uint8_t tc_muls[9] = { 10, 6, 10, 6, 10, 10, 10, 10, 1 }; - -static int64_t parse_timecode(const uint8_t *buf, int64_t packet_time) { - int i; - int64_t ms = 0; - if (buf[2] != ':' || buf[5] != ':' || buf[8] != '.') - return AV_NOPTS_VALUE; - for (i = 0; i < sizeof(tc_offsets); i++) { - uint8_t c = buf[tc_offsets[i]] - '0'; - if (c > 9) return AV_NOPTS_VALUE; - ms = (ms + c) * tc_muls[i]; - } - return ms - packet_time; -} - -static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, - AVPacket *avpkt) { - const uint8_t *buf = avpkt->data; - int buf_size = avpkt->size; - AVSubtitle *sub = data; - const uint8_t *buf_end = buf + buf_size; - uint8_t *bitmap; - int w, h, x, y, i; - int64_t packet_time = 0; - GetBitContext gb; - int has_alpha = avctx->codec_tag == MKTAG('D','X','S','A'); - - // check that at least header fits - if (buf_size < 27 + 7 * 2 + 4 * 3) { - av_log(avctx, AV_LOG_ERROR, "coded frame size %d too small\n", buf_size); - return -1; - } - - // read start and end time - if (buf[0] != '[' || buf[13] != '-' || buf[26] != ']') { - av_log(avctx, AV_LOG_ERROR, "invalid time code\n"); - return -1; - } - if (avpkt->pts != AV_NOPTS_VALUE) - packet_time = av_rescale_q(avpkt->pts, AV_TIME_BASE_Q, (AVRational){1, 1000}); - sub->start_display_time = parse_timecode(buf + 1, packet_time); - sub->end_display_time = parse_timecode(buf + 14, packet_time); - buf += 27; - - // read header - w = bytestream_get_le16(&buf); - h = bytestream_get_le16(&buf); - if (av_image_check_size(w, h, 0, avctx) < 0) - return -1; - x = bytestream_get_le16(&buf); - y = bytestream_get_le16(&buf); - // skip bottom right position, it gives no new information - bytestream_get_le16(&buf); - bytestream_get_le16(&buf); - // The following value is supposed to indicate the start offset - // (relative to the palette) of the data for the second field, - // however there are files in which it has a bogus value and thus - // we just ignore it - bytestream_get_le16(&buf); - - // allocate sub and set values - sub->rects = av_mallocz(sizeof(*sub->rects)); - sub->rects[0] = av_mallocz(sizeof(*sub->rects[0])); - sub->num_rects = 1; - sub->rects[0]->x = x; sub->rects[0]->y = y; - sub->rects[0]->w = w; sub->rects[0]->h = h; - sub->rects[0]->type = SUBTITLE_BITMAP; - sub->rects[0]->pict.linesize[0] = w; - sub->rects[0]->pict.data[0] = av_malloc(w * h); - sub->rects[0]->nb_colors = 4; - sub->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE); - - // read palette - for (i = 0; i < sub->rects[0]->nb_colors; i++) - ((uint32_t*)sub->rects[0]->pict.data[1])[i] = bytestream_get_be24(&buf); - // make all except background (first entry) non-transparent - for (i = 0; i < sub->rects[0]->nb_colors; i++) - ((uint32_t*)sub->rects[0]->pict.data[1])[i] |= (has_alpha ? *buf++ : (i ? 0xff : 0)) << 24; - - // process RLE-compressed data - init_get_bits(&gb, buf, (buf_end - buf) * 8); - bitmap = sub->rects[0]->pict.data[0]; - for (y = 0; y < h; y++) { - // interlaced: do odd lines - if (y == (h + 1) / 2) bitmap = sub->rects[0]->pict.data[0] + w; - for (x = 0; x < w; ) { - int log2 = ff_log2_tab[show_bits(&gb, 8)]; - int run = get_bits(&gb, 14 - 4 * (log2 >> 1)); - int color = get_bits(&gb, 2); - run = FFMIN(run, w - x); - // run length 0 means till end of row - if (!run) run = w - x; - memset(bitmap, color, run); - bitmap += run; - x += run; - } - // interlaced, skip every second line - bitmap += w; - align_get_bits(&gb); - } - *data_size = 1; - return buf_size; -} - -AVCodec ff_xsub_decoder = { - .name = "xsub", - .type = AVMEDIA_TYPE_SUBTITLE, - .id = AV_CODEC_ID_XSUB, - .init = decode_init, - .decode = decode_frame, - .long_name = NULL_IF_CONFIG_SMALL("XSUB"), -}; |