mirror of https://github.com/FFmpeg/FFmpeg.git
Clément Bœsch
13 years ago
parent
d948893dbd
commit
53640f42be
13 changed files with 304 additions and 3 deletions
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/*
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* Copyright (c) 2012 Clément Bœsch |
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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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/**
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* @file |
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* SAMI subtitle decoder |
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* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
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*/ |
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#include "ass.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/bprint.h" |
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typedef struct { |
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AVBPrint source; |
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AVBPrint content; |
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AVBPrint full; |
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} SAMIContext; |
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static int sami_paragraph_to_ass(AVCodecContext *avctx, const char *src) |
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{ |
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SAMIContext *sami = avctx->priv_data; |
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int ret = 0; |
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char *tag = NULL; |
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char *dupsrc = av_strdup(src); |
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char *p = dupsrc; |
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av_bprint_clear(&sami->content); |
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for (;;) { |
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char *saveptr = NULL; |
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int prev_chr_is_space = 0; |
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AVBPrint *dst = &sami->content; |
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/* parse & extract paragraph tag */ |
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p = av_stristr(p, "<P"); |
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if (!p) |
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break; |
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if (p[2] != '>' && !isspace(p[2])) { // avoid confusion with tags such as <PRE>
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p++; |
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continue; |
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} |
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if (dst->len) // add a separator with the previous paragraph if there was one
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av_bprintf(dst, "\\N"); |
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tag = av_strtok(p, ">", &saveptr); |
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if (!tag || !saveptr) |
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break; |
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p = saveptr; |
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/* check if the current paragraph is the "source" (speaker name) */ |
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if (av_stristr(tag, "ID=Source") || av_stristr(tag, "ID=\"Source\"")) { |
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dst = &sami->source; |
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av_bprint_clear(dst); |
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} |
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/* if empty event -> skip subtitle */ |
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while (isspace(*p)) |
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p++; |
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if (!strncmp(p, " ", 6)) { |
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ret = -1; |
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goto end; |
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} |
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/* extract the text, stripping most of the tags */ |
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while (*p) { |
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if (*p == '<') { |
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if (!av_strncasecmp(p, "<P", 2) && (p[2] == '>' || isspace(p[2]))) |
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break; |
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if (!av_strncasecmp(p, "<BR", 3)) |
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av_bprintf(dst, "\\N"); |
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p++; |
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while (*p && *p != '>') |
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p++; |
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if (!*p) |
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break; |
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if (*p == '>') |
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p++; |
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} |
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if (!isspace(*p)) |
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av_bprint_chars(dst, *p, 1); |
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else if (!prev_chr_is_space) |
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av_bprint_chars(dst, ' ', 1); |
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prev_chr_is_space = isspace(*p); |
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p++; |
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} |
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} |
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av_bprint_clear(&sami->full); |
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if (sami->source.len) |
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av_bprintf(&sami->full, "{\\i1}%s{\\i0}\\N", sami->source.str); |
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av_bprintf(&sami->full, "%s\r\n", sami->content.str); |
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end: |
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av_free(dupsrc); |
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return ret; |
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} |
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static int sami_decode_frame(AVCodecContext *avctx, |
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void *data, int *got_sub_ptr, AVPacket *avpkt) |
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{ |
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AVSubtitle *sub = data; |
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const char *ptr = avpkt->data; |
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SAMIContext *sami = avctx->priv_data; |
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if (ptr && avpkt->size > 0 && !sami_paragraph_to_ass(avctx, ptr)) { |
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int ts_start = av_rescale_q(avpkt->pts, avctx->time_base, (AVRational){1,100}); |
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int ts_duration = avpkt->duration != -1 ? |
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av_rescale_q(avpkt->duration, avctx->time_base, (AVRational){1,100}) : -1; |
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ff_ass_add_rect(sub, sami->full.str, ts_start, ts_duration, 0); |
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} |
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*got_sub_ptr = sub->num_rects > 0; |
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return avpkt->size; |
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} |
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static av_cold int sami_init(AVCodecContext *avctx) |
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{ |
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SAMIContext *sami = avctx->priv_data; |
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av_bprint_init(&sami->source, 0, 2048); |
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av_bprint_init(&sami->content, 0, 2048); |
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av_bprint_init(&sami->full, 0, 2048); |
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return ff_ass_subtitle_header_default(avctx); |
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} |
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static av_cold int sami_close(AVCodecContext *avctx) |
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{ |
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SAMIContext *sami = avctx->priv_data; |
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av_bprint_finalize(&sami->source, NULL); |
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av_bprint_finalize(&sami->content, NULL); |
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av_bprint_finalize(&sami->full, NULL); |
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return 0; |
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} |
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AVCodec ff_sami_decoder = { |
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.name = "sami", |
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.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle"), |
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.type = AVMEDIA_TYPE_SUBTITLE, |
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.id = CODEC_ID_SAMI, |
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.priv_data_size = sizeof(SAMIContext), |
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.init = sami_init, |
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.close = sami_close, |
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.decode = sami_decode_frame, |
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}; |
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@ -0,0 +1,132 @@ |
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/*
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* Copyright (c) 2012 Clément Bœsch |
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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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/**
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* @file |
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* SAMI subtitle demuxer |
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* @see http://msdn.microsoft.com/en-us/library/ms971327.aspx
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*/ |
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#include "avformat.h" |
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#include "internal.h" |
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#include "subtitles.h" |
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#include "libavutil/avstring.h" |
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#include "libavutil/bprint.h" |
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#include "libavutil/intreadwrite.h" |
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typedef struct { |
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FFDemuxSubtitlesQueue q; |
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} SAMIContext; |
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static int sami_probe(AVProbeData *p) |
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{ |
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const unsigned char *ptr = p->buf; |
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if (AV_RB24(ptr) == 0xEFBBBF) |
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ptr += 3; /* skip UTF-8 BOM */ |
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return !strncmp(ptr, "<SAMI>", 6) ? AVPROBE_SCORE_MAX : 0; |
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} |
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static int sami_read_header(AVFormatContext *s) |
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{ |
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SAMIContext *sami = s->priv_data; |
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AVStream *st = avformat_new_stream(s, NULL); |
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AVBPrint buf, hdr_buf; |
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char c = 0; |
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int res = 0, got_first_sync_point = 0; |
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if (!st) |
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return AVERROR(ENOMEM); |
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avpriv_set_pts_info(st, 64, 1, 1000); |
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st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE; |
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st->codec->codec_id = CODEC_ID_SAMI; |
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av_bprint_init(&buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
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av_bprint_init(&hdr_buf, 0, AV_BPRINT_SIZE_UNLIMITED); |
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while (!url_feof(s->pb)) { |
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AVPacket *sub; |
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const int64_t pos = avio_tell(s->pb) - (c != 0); |
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int is_sync, n = ff_smil_extract_next_chunk(s->pb, &buf, &c); |
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if (n == 0) |
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break; |
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is_sync = !av_strncasecmp(buf.str, "<SYNC", 5); |
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if (is_sync) |
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got_first_sync_point = 1; |
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if (!got_first_sync_point) { |
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av_bprintf(&hdr_buf, "%s", buf.str); |
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} else { |
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sub = ff_subtitles_queue_insert(&sami->q, buf.str, buf.len, !is_sync); |
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if (!sub) { |
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res = AVERROR(ENOMEM); |
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goto end; |
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} |
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if (is_sync) { |
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const char *p = ff_smil_get_attr_ptr(buf.str, "Start"); |
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sub->pos = pos; |
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sub->pts = p ? strtol(p, NULL, 10) : 0; |
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sub->duration = -1; |
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} |
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} |
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av_bprint_clear(&buf); |
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} |
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st->codec->extradata_size = hdr_buf.len + 1; |
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av_bprint_finalize(&hdr_buf, (char **)&st->codec->extradata); |
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if (!st->codec->extradata) { |
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st->codec->extradata_size = 0; |
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res = AVERROR(ENOMEM); |
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goto end; |
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} |
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ff_subtitles_queue_finalize(&sami->q); |
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end: |
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av_bprint_finalize(&buf, NULL); |
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return res; |
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} |
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static int sami_read_packet(AVFormatContext *s, AVPacket *pkt) |
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{ |
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SAMIContext *sami = s->priv_data; |
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return ff_subtitles_queue_read_packet(&sami->q, pkt); |
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} |
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static int sami_read_close(AVFormatContext *s) |
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{ |
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SAMIContext *sami = s->priv_data; |
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ff_subtitles_queue_clean(&sami->q); |
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return 0; |
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} |
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AVInputFormat ff_sami_demuxer = { |
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.name = "sami", |
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.long_name = NULL_IF_CONFIG_SMALL("SAMI subtitle format"), |
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.priv_data_size = sizeof(SAMIContext), |
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.read_probe = sami_probe, |
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.read_header = sami_read_header, |
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.read_packet = sami_read_packet, |
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.read_close = sami_read_close, |
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.flags = AVFMT_GENERIC_INDEX, |
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.extensions = "smi,sami", |
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}; |
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@ -0,0 +1 @@ |
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00642e143339b4ca29dc6e990436387c |
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