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-rw-r--r--libavcodec/srtdec.c252
1 files changed, 61 insertions, 191 deletions
diff --git a/libavcodec/srtdec.c b/libavcodec/srtdec.c
index 4c5f6e5fe8..862ab47645 100644
--- a/libavcodec/srtdec.c
+++ b/libavcodec/srtdec.c
@@ -2,241 +2,111 @@
* SubRip subtitle decoder
* Copyright (c) 2010 Aurelien Jacobs <aurel@gnuage.org>
*
- * This file is part of Libav.
+ * This file is part of FFmpeg.
*
- * Libav is free software; you can redistribute it and/or
+ * 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.
*
- * Libav is distributed in the hope that it will be useful,
+ * 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 Libav; if not, write to the Free Software
+ * 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/avstring.h"
#include "libavutil/common.h"
+#include "libavutil/intreadwrite.h"
#include "libavutil/parseutils.h"
#include "avcodec.h"
#include "ass.h"
+#include "htmlsubtitles.h"
-static int html_color_parse(AVCodecContext *avctx, const char *str)
+static void srt_to_ass(AVCodecContext *avctx, AVBPrint *dst,
+ const char *in, int x1, int y1, int x2, int y2)
{
- uint8_t rgba[4];
- if (av_parse_color(rgba, str, strcspn(str, "\" >"), avctx) < 0)
- return -1;
- return rgba[0] | rgba[1] << 8 | rgba[2] << 16;
-}
-
-enum {
- PARAM_UNKNOWN = -1,
- PARAM_SIZE,
- PARAM_COLOR,
- PARAM_FACE,
- PARAM_NUMBER
-};
-
-typedef struct SrtStack {
- char tag[128];
- char param[PARAM_NUMBER][128];
-} SrtStack;
-
-static const char *srt_to_ass(AVCodecContext *avctx, char *out, char *out_end,
- const char *in, int x1, int y1, int x2, int y2)
-{
- char c, *param, buffer[128], tmp[128];
- int len, tag_close, sptr = 1, line_start = 1, an = 0, end = 0;
- SrtStack stack[16];
-
- stack[0].tag[0] = 0;
- strcpy(stack[0].param[PARAM_SIZE], "{\\fs}");
- strcpy(stack[0].param[PARAM_COLOR], "{\\c}");
- strcpy(stack[0].param[PARAM_FACE], "{\\fn}");
-
if (x1 >= 0 && y1 >= 0) {
- if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1))
- out += snprintf(out, out_end-out,
- "{\\an1}{\\move(%d,%d,%d,%d)}", x1, y1, x2, y2);
- else
- out += snprintf(out, out_end-out, "{\\an1}{\\pos(%d,%d)}", x1, y1);
- }
-
- for (; out < out_end && !end && *in; in++) {
- switch (*in) {
- case '\r':
- break;
- case '\n':
- if (line_start) {
- end = 1;
- break;
- }
- while (out[-1] == ' ')
- out--;
- out += snprintf(out, out_end-out, "\\N");
- line_start = 1;
- break;
- case ' ':
- if (!line_start)
- *out++ = *in;
- break;
- case '{': /* skip all {\xxx} substrings except for {\an%d}
- and all microdvd like styles such as {Y:xxx} */
- an += sscanf(in, "{\\an%*1u}%c", &c) == 1;
- if ((an != 1 && sscanf(in, "{\\%*[^}]}%n%c", &len, &c) > 0) ||
- sscanf(in, "{%*1[CcFfoPSsYy]:%*[^}]}%n%c", &len, &c) > 0) {
- in += len - 1;
- } else
- *out++ = *in;
- break;
- case '<':
- tag_close = in[1] == '/';
- if (sscanf(in+tag_close+1, "%127[^>]>%n%c", buffer, &len,&c) >= 2) {
- if ((param = strchr(buffer, ' ')))
- *param++ = 0;
- if ((!tag_close && sptr < FF_ARRAY_ELEMS(stack)) ||
- ( tag_close && sptr > 0 && !strcmp(stack[sptr-1].tag, buffer))) {
- int i, j, unknown = 0;
- in += len + tag_close;
- if (!tag_close)
- memset(stack+sptr, 0, sizeof(*stack));
- if (!strcmp(buffer, "font")) {
- if (tag_close) {
- for (i=PARAM_NUMBER-1; i>=0; i--)
- if (stack[sptr-1].param[i][0])
- for (j=sptr-2; j>=0; j--)
- if (stack[j].param[i][0]) {
- out += snprintf(out, out_end-out,
- "%s", stack[j].param[i]);
- break;
- }
- } else {
- while (param) {
- if (!strncmp(param, "size=", 5)) {
- unsigned font_size;
- param += 5 + (param[5] == '"');
- if (sscanf(param, "%u", &font_size) == 1) {
- snprintf(stack[sptr].param[PARAM_SIZE],
- sizeof(stack[0].param[PARAM_SIZE]),
- "{\\fs%u}", font_size);
- }
- } else if (!strncmp(param, "color=", 6)) {
- param += 6 + (param[6] == '"');
- snprintf(stack[sptr].param[PARAM_COLOR],
- sizeof(stack[0].param[PARAM_COLOR]),
- "{\\c&H%X&}",
- html_color_parse(avctx, param));
- } else if (!strncmp(param, "face=", 5)) {
- param += 5 + (param[5] == '"');
- len = strcspn(param,
- param[-1] == '"' ? "\"" :" ");
- av_strlcpy(tmp, param,
- FFMIN(sizeof(tmp), len+1));
- param += len;
- snprintf(stack[sptr].param[PARAM_FACE],
- sizeof(stack[0].param[PARAM_FACE]),
- "{\\fn%s}", tmp);
- }
- if ((param = strchr(param, ' ')))
- param++;
- }
- for (i=0; i<PARAM_NUMBER; i++)
- if (stack[sptr].param[i][0])
- out += snprintf(out, out_end-out,
- "%s", stack[sptr].param[i]);
- }
- } else if (!buffer[1] && strspn(buffer, "bisu") == 1) {
- out += snprintf(out, out_end-out,
- "{\\%c%d}", buffer[0], !tag_close);
- } else {
- unknown = 1;
- snprintf(tmp, sizeof(tmp), "</%s>", buffer);
- }
- if (tag_close) {
- sptr--;
- } else if (unknown && !strstr(in, tmp)) {
- in -= len + tag_close;
- *out++ = *in;
- } else
- av_strlcpy(stack[sptr++].tag, buffer,
- sizeof(stack[0].tag));
- break;
- }
- }
- default:
- *out++ = *in;
- break;
+ /* XXX: here we rescale coordinate assuming they are in DVD resolution
+ * (720x480) since we don't have anything better */
+
+ if (x2 >= 0 && y2 >= 0 && (x2 != x1 || y2 != y1) && x2 >= x1 && y2 >= y1) {
+ /* text rectangle defined, write the text at the center of the rectangle */
+ const int cx = x1 + (x2 - x1)/2;
+ const int cy = y1 + (y2 - y1)/2;
+ const int scaled_x = cx * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
+ const int scaled_y = cy * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
+ av_bprintf(dst, "{\\an5}{\\pos(%d,%d)}", scaled_x, scaled_y);
+ } else {
+ /* only the top left corner, assume the text starts in that corner */
+ const int scaled_x = x1 * (int64_t)ASS_DEFAULT_PLAYRESX / 720;
+ const int scaled_y = y1 * (int64_t)ASS_DEFAULT_PLAYRESY / 480;
+ av_bprintf(dst, "{\\an1}{\\pos(%d,%d)}", scaled_x, scaled_y);
}
- if (*in != ' ' && *in != '\r' && *in != '\n')
- line_start = 0;
}
- out = FFMIN(out, out_end-3);
- while (!strncmp(out-2, "\\N", 2))
- out -= 2;
- while (out[-1] == ' ')
- out--;
- out += snprintf(out, out_end-out, "\r\n");
- return in;
-}
-
-static const char *read_ts(const char *buf, int *ts_start, int *ts_end,
- int *x1, int *y1, int *x2, int *y2)
-{
- int i, hs, ms, ss, he, me, se;
-
- for (i=0; i<2; i++) {
- /* try to read timestamps in either the first or second line */
- int c = sscanf(buf, "%d:%2d:%2d%*1[,.]%3d --> %d:%2d:%2d%*1[,.]%3d"
- "%*[ ]X1:%d X2:%d Y1:%d Y2:%d",
- &hs, &ms, &ss, ts_start, &he, &me, &se, ts_end,
- x1, x2, y1, y2);
- buf += strcspn(buf, "\n") + 1;
- if (c >= 8) {
- *ts_start = 100*(ss + 60*(ms + 60*hs)) + *ts_start/10;
- *ts_end = 100*(se + 60*(me + 60*he)) + *ts_end /10;
- return buf;
- }
- }
- return NULL;
+ ff_htmlmarkup_to_ass(avctx, dst, in);
}
static int srt_decode_frame(AVCodecContext *avctx,
void *data, int *got_sub_ptr, AVPacket *avpkt)
{
AVSubtitle *sub = data;
- int ts_start, ts_end, x1 = -1, y1 = -1, x2 = -1, y2 = -1;
- char buffer[2048];
- const char *ptr = avpkt->data;
- const char *end = avpkt->data + avpkt->size;
+ AVBPrint buffer;
+ int x1 = -1, y1 = -1, x2 = -1, y2 = -1;
+ int size, ret;
+ const uint8_t *p = av_packet_get_side_data(avpkt, AV_PKT_DATA_SUBTITLE_POSITION, &size);
+ FFASSDecoderContext *s = avctx->priv_data;
+
+ if (p && size == 16) {
+ x1 = AV_RL32(p );
+ y1 = AV_RL32(p + 4);
+ x2 = AV_RL32(p + 8);
+ y2 = AV_RL32(p + 12);
+ }
if (avpkt->size <= 0)
return avpkt->size;
- ff_ass_init(sub);
+ av_bprint_init(&buffer, 0, AV_BPRINT_SIZE_UNLIMITED);
- while (ptr < end && *ptr) {
- ptr = read_ts(ptr, &ts_start, &ts_end, &x1, &y1, &x2, &y2);
- if (!ptr)
- break;
- ptr = srt_to_ass(avctx, buffer, buffer+sizeof(buffer), ptr,
- x1, y1, x2, y2);
- ff_ass_add_rect(sub, buffer, ts_start, ts_end, 0);
- }
+ srt_to_ass(avctx, &buffer, avpkt->data, x1, y1, x2, y2);
+ ret = ff_ass_add_rect(sub, buffer.str, s->readorder++, 0, NULL, NULL);
+ av_bprint_finalize(&buffer, NULL);
+ if (ret < 0)
+ return ret;
*got_sub_ptr = sub->num_rects > 0;
return avpkt->size;
}
+#if CONFIG_SRT_DECODER
+/* deprecated decoder */
AVCodec ff_srt_decoder = {
.name = "srt",
.long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
.type = AVMEDIA_TYPE_SUBTITLE,
- .id = AV_CODEC_ID_SRT,
+ .id = AV_CODEC_ID_SUBRIP,
+ .init = ff_ass_subtitle_header_default,
+ .decode = srt_decode_frame,
+ .flush = ff_ass_decoder_flush,
+ .priv_data_size = sizeof(FFASSDecoderContext),
+};
+#endif
+
+#if CONFIG_SUBRIP_DECODER
+AVCodec ff_subrip_decoder = {
+ .name = "subrip",
+ .long_name = NULL_IF_CONFIG_SMALL("SubRip subtitle"),
+ .type = AVMEDIA_TYPE_SUBTITLE,
+ .id = AV_CODEC_ID_SUBRIP,
.init = ff_ass_subtitle_header_default,
.decode = srt_decode_frame,
+ .flush = ff_ass_decoder_flush,
+ .priv_data_size = sizeof(FFASSDecoderContext),
};
+#endif
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