add missing files in previous commit (ASS encoder and decoder)

Originally committed as revision 25747 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/ass.c

+/*
+ * SSA/ASS common funtions
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 "ass.h"
+
+void ff_ass_init(AVSubtitle *sub)
+{
+    memset(sub, 0, sizeof(*sub));
+}
+
+static int ts_to_string(char *str, int strlen, int ts)
+{
+    int h, m, s;
+    h = ts/360000;  ts -= 360000*h;
+    m = ts/  6000;  ts -=   6000*m;
+    s = ts/   100;  ts -=    100*s;
+    return snprintf(str, strlen, "%d:%02d:%02d.%02d", h, m, s, ts);
+}
+
+int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
+                    int ts_start, int ts_end, int raw)
+{
+    int len = 0, dlen, duration = ts_end - ts_start;
+    char s_start[16], s_end[16], header[48] = {0};
+    AVSubtitleRect **rects;
+
+    if (!raw) {
+        ts_to_string(s_start, sizeof(s_start), ts_start);
+        ts_to_string(s_end,   sizeof(s_end),   ts_end  );
+        len = snprintf(header, sizeof(header), "Dialogue: 0,%s,%s,",
+                       s_start, s_end);
+    }
+
+    dlen = strcspn(dialog, "\n");
+    dlen += dialog[dlen] == '\n';
+
+    rects = av_realloc(sub->rects, (sub->num_rects+1) * sizeof(*sub->rects));
+    if (!rects)
+        return AVERROR(ENOMEM);
+    sub->rects = rects;
+    sub->end_display_time = FFMAX(sub->end_display_time, 10 * duration);
+    rects[sub->num_rects]       = av_mallocz(sizeof(*rects[0]));
+    rects[sub->num_rects]->type = SUBTITLE_ASS;
+    rects[sub->num_rects]->ass  = av_malloc(len + dlen + 1);
+    strcpy (rects[sub->num_rects]->ass      , header);
+    strncpy(rects[sub->num_rects]->ass + len, dialog, dlen);
+    sub->num_rects++;
+    return dlen;
+}

libavcodec/ass.h

+/*
+ * SSA/ASS common funtions
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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
+ */
+
+#ifndef AVCODEC_ASS_H
+#define AVCODEC_ASS_H
+
+#include "avcodec.h"
+
+/**
+ * Initialize an AVSubtitle structure for use with ff_ass_add_rect().
+ *
+ * @param sub pointer to the AVSubtitle
+ */
+void ff_ass_init(AVSubtitle *sub);
+
+/**
+ * Add an ASS dialog line to an AVSubtitle as a new AVSubtitleRect.
+ *
+ * @param sub pointer to the AVSubtitle
+ * @param dialog ASS dialog to add to sub
+ * @param ts_start start timestamp for this dialog (in 1/100 second unit)
+ * @param ts_end end timestamp for this dialog (in 1/100 second unit)
+ * @param raw when set to 1, it indicates that dialog contains a whole ASS
+ *                           dialog line which should be copied as is.
+ *            when set to 0, it indicates that dialog contains only the Text
+ *                           part of the ASS dialog line, the rest of the line
+ *                           will be generated.
+ * @return number of characters read from dialog. It can be less than the whole
+ *         length of dialog, if dialog contains several lines of text.
+ *         A negative value indicates an error.
+ */
+int ff_ass_add_rect(AVSubtitle *sub, const char *dialog,
+                    int ts_start, int ts_end, int raw);
+
+#endif /* AVCODEC_ASS_H */

libavcodec/assdec.c

+/*
+ * SSA/ASS decoder
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 "ass.h"
+
+static av_cold int ass_decode_init(AVCodecContext *avctx)
+{
+    avctx->subtitle_header = av_malloc(avctx->extradata_size);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    memcpy(avctx->subtitle_header, avctx->extradata, avctx->extradata_size);
+    avctx->subtitle_header_size = avctx->extradata_size;
+    return 0;
+}
+
+static int ass_decode_frame(AVCodecContext *avctx, void *data, int *got_sub_ptr,
+                            AVPacket *avpkt)
+{
+    const char *ptr = avpkt->data;
+    int len, size = avpkt->size;
+
+    ff_ass_init(data);
+
+    while (size > 0) {
+        len = ff_ass_add_rect(data, ptr, 0, 0/* FIXME: duration */, 1);
+        if (len < 0)
+            return len;
+        ptr  += len;
+        size -= len;
+    }
+
+    *got_sub_ptr = avpkt->size > 0;
+    return avpkt->size;
+}
+
+AVCodec ass_decoder = {
+    .name         = "ass",
+    .long_name    = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = CODEC_ID_SSA,
+    .init         = ass_decode_init,
+    .decode       = ass_decode_frame,
+};

libavcodec/assenc.c

+/*
+ * SSA/ASS encoder
+ * Copyright (c) 2010  Aurelien Jacobs <aurel@gnuage.org>
+ *
+ * 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 "libavutil/avstring.h"
+
+static av_cold int ass_encode_init(AVCodecContext *avctx)
+{
+    avctx->extradata = av_malloc(avctx->subtitle_header_size);
+    if (!avctx->extradata)
+        return AVERROR(ENOMEM);
+    memcpy(avctx->extradata, avctx->subtitle_header, avctx->subtitle_header_size);
+    avctx->extradata_size = avctx->subtitle_header_size;
+    return 0;
+}
+
+static int ass_encode_frame(AVCodecContext *avctx,
+                            unsigned char *buf, int bufsize, void *data)
+{
+    AVSubtitle *sub = data;
+    int i, len, total_len = 0;
+
+    for (i=0; i<sub->num_rects; i++) {
+        if (sub->rects[i]->type != SUBTITLE_ASS) {
+            av_log(avctx, AV_LOG_ERROR, "Only SUBTITLE_ASS type supported.\n");
+            return -1;
+        }
+
+        len = av_strlcpy(buf+total_len, sub->rects[i]->ass, bufsize-total_len);
+
+        if (len > bufsize-total_len-1) {
+            av_log(avctx, AV_LOG_ERROR, "Buffer too small for ASS event.\n");
+            return -1;
+        }
+
+        total_len += len;
+    }
+
+    return total_len;
+}
+
+AVCodec ass_encoder = {
+    .name         = "ass",
+    .long_name    = NULL_IF_CONFIG_SMALL("Advanced SubStation Alpha subtitle"),
+    .type         = AVMEDIA_TYPE_SUBTITLE,
+    .id           = CODEC_ID_SSA,
+    .init         = ass_encode_init,
+    .encode       = ass_encode_frame,
+};