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 "bsf.h"
24#include "bsf_internal.h"
25
26static int text2movsub(AVBSFContext *ctx, AVPacket *out)
27{
28    AVPacket *in;
29    int ret = 0;
30
31    ret = ff_bsf_get_packet(ctx, &in);
32    if (ret < 0)
33        return ret;
34
35    if (in->size > 0xffff) {
36        ret = AVERROR_INVALIDDATA;
37        goto fail;
38    }
39
40    ret = av_new_packet(out, in->size + 2);
41    if (ret < 0) {
42        ret = AVERROR(ENOMEM);
43        goto fail;
44    }
45
46    ret = av_packet_copy_props(out, in);
47    if (ret < 0)
48        goto fail;
49
50    AV_WB16(out->data, in->size);
51    memcpy(out->data + 2, in->data, in->size);
52
53fail:
54    if (ret < 0)
55        av_packet_unref(out);
56    av_packet_free(&in);
57    return ret;
58}
59
60const FFBitStreamFilter ff_text2movsub_bsf = {
61    .p.name = "text2movsub",
62    .filter = text2movsub,
63};
64
65static int mov2textsub(AVBSFContext *ctx, AVPacket *pkt)
66{
67    int ret = 0;
68
69    ret = ff_bsf_get_packet_ref(ctx, pkt);
70    if (ret < 0)
71        return ret;
72
73    if (pkt->size < 2) {
74       av_packet_unref(pkt);
75       return AVERROR_INVALIDDATA;
76    }
77
78    pkt->size  = FFMIN(pkt->size - 2, AV_RB16(pkt->data));
79    pkt->data += 2;
80
81    return 0;
82}
83
84const FFBitStreamFilter ff_mov2textsub_bsf = {
85    .p.name = "mov2textsub",
86    .filter = mov2textsub,
87};
88