Line data Source code
1 : /*
2 : * Copyright (c) 2008 Reimar Döffinger
3 : *
4 : * This file is part of FFmpeg.
5 : *
6 : * FFmpeg is free software; you can redistribute it and/or
7 : * modify it under the terms of the GNU Lesser General Public
8 : * License as published by the Free Software Foundation; either
9 : * version 2.1 of the License, or (at your option) any later version.
10 : *
11 : * FFmpeg is distributed in the hope that it will be useful,
12 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 : * Lesser General Public License for more details.
15 : *
16 : * You should have received a copy of the GNU Lesser General Public
17 : * License along with FFmpeg; if not, write to the Free Software
18 : * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 : */
20 :
21 : #include "libavutil/common.h"
22 : #include "libavutil/intreadwrite.h"
23 : #include "avcodec.h"
24 : #include "bsf.h"
25 :
26 0 : static int text2movsub(AVBSFContext *ctx, AVPacket *out)
27 : {
28 : AVPacket *in;
29 0 : int ret = 0;
30 :
31 0 : ret = ff_bsf_get_packet(ctx, &in);
32 0 : if (ret < 0)
33 0 : return ret;
34 :
35 0 : if (in->size > 0xffff) {
36 0 : ret = AVERROR_INVALIDDATA;
37 0 : goto fail;
38 : }
39 :
40 0 : ret = av_new_packet(out, in->size + 2);
41 0 : if (ret < 0) {
42 0 : ret = AVERROR(ENOMEM);
43 0 : goto fail;
44 : }
45 :
46 0 : ret = av_packet_copy_props(out, in);
47 0 : if (ret < 0)
48 0 : goto fail;
49 :
50 0 : AV_WB16(out->data, in->size);
51 0 : memcpy(out->data + 2, in->data, in->size);
52 :
53 0 : fail:
54 0 : if (ret < 0)
55 0 : av_packet_unref(out);
56 0 : av_packet_free(&in);
57 0 : return ret;
58 : }
59 :
60 : const AVBitStreamFilter ff_text2movsub_bsf = {
61 : .name = "text2movsub",
62 : .filter = text2movsub,
63 : };
64 :
65 0 : static int mov2textsub(AVBSFContext *ctx, AVPacket *pkt)
66 : {
67 0 : int ret = 0;
68 :
69 0 : ret = ff_bsf_get_packet_ref(ctx, pkt);
70 0 : if (ret < 0)
71 0 : return ret;
72 :
73 0 : if (pkt->size < 2) {
74 0 : av_packet_unref(pkt);
75 0 : return AVERROR_INVALIDDATA;
76 : }
77 :
78 0 : pkt->data += 2;
79 0 : pkt->size = FFMIN(pkt->size - 2, AV_RB16(pkt->data));
80 :
81 0 : return 0;
82 : }
83 :
84 : const AVBitStreamFilter ff_mov2textsub_bsf = {
85 : .name = "mov2textsub",
86 : .filter = mov2textsub,
87 : };
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