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![Michael Niedermayer](/assets/img/avatar_default.png)
* commit '716d413c13981da15323c7a3821860536eefdbbb': Replace PIX_FMT_* -> AV_PIX_FMT_*, PixelFormat -> AVPixelFormat Conflicts: doc/examples/muxing.c ffmpeg.h ffmpeg_filter.c ffmpeg_opt.c ffplay.c ffprobe.c libavcodec/8bps.c libavcodec/aasc.c libavcodec/aura.c libavcodec/avcodec.h libavcodec/avs.c libavcodec/bfi.c libavcodec/bmp.c libavcodec/bmpenc.c libavcodec/c93.c libavcodec/cscd.c libavcodec/cyuv.c libavcodec/dpx.c libavcodec/dpxenc.c libavcodec/eatgv.c libavcodec/escape124.c libavcodec/ffv1.c libavcodec/flashsv.c libavcodec/fraps.c libavcodec/h264.c libavcodec/huffyuv.c libavcodec/iff.c libavcodec/imgconvert.c libavcodec/indeo3.c libavcodec/kmvc.c libavcodec/libopenjpegdec.c libavcodec/libopenjpegenc.c libavcodec/libx264.c libavcodec/ljpegenc.c libavcodec/mjpegdec.c libavcodec/mjpegenc.c libavcodec/motionpixels.c libavcodec/mpeg12.c libavcodec/mpeg12enc.c libavcodec/mpeg4videodec.c libavcodec/mpegvideo_enc.c libavcodec/pamenc.c libavcodec/pcxenc.c libavcodec/pgssubdec.c libavcodec/pngdec.c libavcodec/pngenc.c libavcodec/pnm.c libavcodec/pnmdec.c libavcodec/pnmenc.c libavcodec/ptx.c libavcodec/qdrw.c libavcodec/qpeg.c libavcodec/qtrleenc.c libavcodec/raw.c libavcodec/rawdec.c libavcodec/rl2.c libavcodec/sgidec.c libavcodec/sgienc.c libavcodec/snowdec.c libavcodec/snowenc.c libavcodec/sunrast.c libavcodec/targa.c libavcodec/targaenc.c libavcodec/tiff.c libavcodec/tiffenc.c libavcodec/tmv.c libavcodec/truemotion2.c libavcodec/utils.c libavcodec/vb.c libavcodec/vp3.c libavcodec/wnv1.c libavcodec/xl.c libavcodec/xwddec.c libavcodec/xwdenc.c libavcodec/yop.c libavdevice/v4l2.c libavdevice/x11grab.c libavfilter/avfilter.c libavfilter/avfilter.h libavfilter/buffersrc.c libavfilter/drawutils.c libavfilter/formats.c libavfilter/src_movie.c libavfilter/vf_ass.c libavfilter/vf_drawtext.c libavfilter/vf_fade.c libavfilter/vf_format.c libavfilter/vf_hflip.c libavfilter/vf_lut.c libavfilter/vf_overlay.c libavfilter/vf_pad.c libavfilter/vf_scale.c libavfilter/vf_transpose.c libavfilter/vf_yadif.c libavfilter/video.c libavfilter/vsrc_testsrc.c libavformat/movenc.c libavformat/mxf.h libavformat/utils.c libavformat/yuv4mpeg.c libavutil/imgutils.c libavutil/pixdesc.c libswscale/input.c libswscale/output.c libswscale/swscale_internal.h libswscale/swscale_unscaled.c libswscale/utils.c libswscale/x86/swscale_template.c libswscale/x86/yuv2rgb.c libswscale/x86/yuv2rgb_template.c libswscale/yuv2rgb.c Merged-by: Michael Niedermayer <michaelni@gmx.at>
146 lines
5.1 KiB
C
146 lines
5.1 KiB
C
/*
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* XSUB subtitle decoder
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* Copyright (c) 2007 Reimar Döffinger
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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/mathematics.h"
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#include "libavutil/imgutils.h"
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#include "avcodec.h"
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#include "get_bits.h"
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#include "bytestream.h"
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static av_cold int decode_init(AVCodecContext *avctx) {
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avctx->pix_fmt = AV_PIX_FMT_PAL8;
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return 0;
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}
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static const uint8_t tc_offsets[9] = { 0, 1, 3, 4, 6, 7, 9, 10, 11 };
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static const uint8_t tc_muls[9] = { 10, 6, 10, 6, 10, 10, 10, 10, 1 };
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static int64_t parse_timecode(const uint8_t *buf, int64_t packet_time) {
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int i;
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int64_t ms = 0;
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if (buf[2] != ':' || buf[5] != ':' || buf[8] != '.')
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return AV_NOPTS_VALUE;
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for (i = 0; i < sizeof(tc_offsets); i++) {
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uint8_t c = buf[tc_offsets[i]] - '0';
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if (c > 9) return AV_NOPTS_VALUE;
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ms = (ms + c) * tc_muls[i];
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}
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return ms - packet_time;
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}
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static int decode_frame(AVCodecContext *avctx, void *data, int *data_size,
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AVPacket *avpkt) {
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const uint8_t *buf = avpkt->data;
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int buf_size = avpkt->size;
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AVSubtitle *sub = data;
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const uint8_t *buf_end = buf + buf_size;
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uint8_t *bitmap;
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int w, h, x, y, i;
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int64_t packet_time = 0;
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GetBitContext gb;
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int has_alpha = avctx->codec_tag == MKTAG('D','X','S','A');
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// check that at least header fits
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if (buf_size < 27 + 7 * 2 + 4 * 3) {
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av_log(avctx, AV_LOG_ERROR, "coded frame size %d too small\n", buf_size);
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return -1;
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}
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// read start and end time
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if (buf[0] != '[' || buf[13] != '-' || buf[26] != ']') {
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av_log(avctx, AV_LOG_ERROR, "invalid time code\n");
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return -1;
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}
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if (avpkt->pts != AV_NOPTS_VALUE)
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packet_time = av_rescale_q(avpkt->pts, AV_TIME_BASE_Q, (AVRational){1, 1000});
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sub->start_display_time = parse_timecode(buf + 1, packet_time);
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sub->end_display_time = parse_timecode(buf + 14, packet_time);
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buf += 27;
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// read header
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w = bytestream_get_le16(&buf);
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h = bytestream_get_le16(&buf);
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if (av_image_check_size(w, h, 0, avctx) < 0)
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return -1;
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x = bytestream_get_le16(&buf);
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y = bytestream_get_le16(&buf);
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// skip bottom right position, it gives no new information
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bytestream_get_le16(&buf);
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bytestream_get_le16(&buf);
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// The following value is supposed to indicate the start offset
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// (relative to the palette) of the data for the second field,
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// however there are files in which it has a bogus value and thus
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// we just ignore it
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bytestream_get_le16(&buf);
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// allocate sub and set values
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sub->rects = av_mallocz(sizeof(*sub->rects));
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sub->rects[0] = av_mallocz(sizeof(*sub->rects[0]));
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sub->num_rects = 1;
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sub->rects[0]->x = x; sub->rects[0]->y = y;
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sub->rects[0]->w = w; sub->rects[0]->h = h;
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sub->rects[0]->type = SUBTITLE_BITMAP;
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sub->rects[0]->pict.linesize[0] = w;
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sub->rects[0]->pict.data[0] = av_malloc(w * h);
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sub->rects[0]->nb_colors = 4;
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sub->rects[0]->pict.data[1] = av_mallocz(AVPALETTE_SIZE);
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// read palette
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for (i = 0; i < sub->rects[0]->nb_colors; i++)
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((uint32_t*)sub->rects[0]->pict.data[1])[i] = bytestream_get_be24(&buf);
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// make all except background (first entry) non-transparent
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for (i = 0; i < sub->rects[0]->nb_colors; i++)
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((uint32_t*)sub->rects[0]->pict.data[1])[i] |= (has_alpha ? *buf++ : (i ? 0xff : 0)) << 24;
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// process RLE-compressed data
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init_get_bits(&gb, buf, (buf_end - buf) * 8);
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bitmap = sub->rects[0]->pict.data[0];
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for (y = 0; y < h; y++) {
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// interlaced: do odd lines
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if (y == (h + 1) / 2) bitmap = sub->rects[0]->pict.data[0] + w;
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for (x = 0; x < w; ) {
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int log2 = ff_log2_tab[show_bits(&gb, 8)];
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int run = get_bits(&gb, 14 - 4 * (log2 >> 1));
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int color = get_bits(&gb, 2);
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run = FFMIN(run, w - x);
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// run length 0 means till end of row
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if (!run) run = w - x;
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memset(bitmap, color, run);
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bitmap += run;
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x += run;
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}
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// interlaced, skip every second line
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bitmap += w;
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align_get_bits(&gb);
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}
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*data_size = 1;
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return buf_size;
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}
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AVCodec ff_xsub_decoder = {
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.name = "xsub",
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.type = AVMEDIA_TYPE_SUBTITLE,
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.id = AV_CODEC_ID_XSUB,
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.init = decode_init,
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.decode = decode_frame,
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.long_name = NULL_IF_CONFIG_SMALL("XSUB"),
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};
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