blob: 3cb1183cd89e342a3ea83c37e81bc31d0a3e394f
| 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 | static 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 | |
| 53 | fail: |
| 54 | if (ret < 0) |
| 55 | av_packet_unref(out); |
| 56 | av_packet_free(&in); |
| 57 | return ret; |
| 58 | } |
| 59 | |
| 60 | const AVBitStreamFilter ff_text2movsub_bsf = { |
| 61 | .name = "text2movsub", |
| 62 | .filter = text2movsub, |
| 63 | }; |
| 64 | |
| 65 | static int mov2textsub(AVBSFContext *ctx, AVPacket *out) |
| 66 | { |
| 67 | AVPacket *in; |
| 68 | int ret = 0; |
| 69 | |
| 70 | ret = ff_bsf_get_packet(ctx, &in); |
| 71 | if (ret < 0) |
| 72 | return ret; |
| 73 | |
| 74 | if (in->size < 2) { |
| 75 | ret = AVERROR_INVALIDDATA; |
| 76 | goto fail; |
| 77 | } |
| 78 | |
| 79 | ret = av_new_packet(out, FFMIN(in->size - 2, AV_RB16(in->data))); |
| 80 | if (ret < 0) |
| 81 | goto fail; |
| 82 | |
| 83 | ret = av_packet_copy_props(out, in); |
| 84 | if (ret < 0) |
| 85 | goto fail; |
| 86 | |
| 87 | memcpy(out->data, in->data + 2, out->size); |
| 88 | |
| 89 | fail: |
| 90 | if (ret < 0) |
| 91 | av_packet_unref(out); |
| 92 | av_packet_free(&in); |
| 93 | return ret; |
| 94 | } |
| 95 | |
| 96 | const AVBitStreamFilter ff_mov2textsub_bsf = { |
| 97 | .name = "mov2textsub", |
| 98 | .filter = mov2textsub, |
| 99 | }; |
| 100 |