diff options
Diffstat (limited to 'libavcodec/dca_core_bsf.c')
-rw-r--r-- | libavcodec/dca_core_bsf.c | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/libavcodec/dca_core_bsf.c b/libavcodec/dca_core_bsf.c new file mode 100644 index 0000000..9edc0cf --- /dev/null +++ b/libavcodec/dca_core_bsf.c @@ -0,0 +1,66 @@ +/* + * Copyright (c) 2016 Paul B Mahol + * + * 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 "bsf.h" +#include "bytestream.h" +#include "dca_syncwords.h" +#include "libavutil/mem.h" + +static int dca_core_filter(AVBSFContext *ctx, AVPacket *out) +{ + AVPacket *in; + GetByteContext gb; + uint32_t syncword; + int core_size = 0, ret; + + ret = ff_bsf_get_packet(ctx, &in); + if (ret < 0) + return ret; + + bytestream2_init(&gb, in->data, in->size); + syncword = bytestream2_get_be32(&gb); + bytestream2_skip(&gb, 1); + + switch (syncword) { + case DCA_SYNCWORD_CORE_BE: + core_size = ((bytestream2_get_be24(&gb) >> 4) & 0x3fff) + 1; + break; + } + + av_packet_move_ref(out, in); + av_packet_free(&in); + + if (core_size > 0 && core_size <= out->size) { + out->size = core_size; + } + + return 0; +} + +static const enum AVCodecID codec_ids[] = { + AV_CODEC_ID_DTS, AV_CODEC_ID_NONE, +}; + +const AVBitStreamFilter ff_dca_core_bsf = { + .name = "dca_core", + .filter = dca_core_filter, + .codec_ids = codec_ids, +}; |