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/* |
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* Copyright (c) 2018 Paul B Mahol |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#include "avcodec.h" |
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#include "bsf.h" |
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#include "get_bits.h" |
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#include "ac3_parser_internal.h" |
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static int eac3_core_filter(AVBSFContext *ctx, AVPacket *pkt) |
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{ |
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AC3HeaderInfo hdr; |
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GetBitContext gbc; |
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int ret; |
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ret = ff_bsf_get_packet_ref(ctx, pkt); |
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✓✓ |
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if (ret < 0) |
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return ret; |
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ret = init_get_bits8(&gbc, pkt->data, pkt->size); |
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✗✓ |
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if (ret < 0) |
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goto fail; |
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ret = ff_ac3_parse_header(&gbc, &hdr); |
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✗✓ |
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if (ret < 0) { |
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ret = AVERROR_INVALIDDATA; |
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goto fail; |
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} |
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✓✗ |
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if (hdr.frame_type == EAC3_FRAME_TYPE_INDEPENDENT || |
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✓✗ |
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hdr.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) { |
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pkt->size = FFMIN(hdr.frame_size, pkt->size); |
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} else if (hdr.frame_type == EAC3_FRAME_TYPE_DEPENDENT && pkt->size > hdr.frame_size) { |
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AC3HeaderInfo hdr2; |
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ret = init_get_bits8(&gbc, pkt->data + hdr.frame_size, pkt->size - hdr.frame_size); |
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if (ret < 0) |
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goto fail; |
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ret = ff_ac3_parse_header(&gbc, &hdr2); |
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if (ret < 0) { |
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ret = AVERROR_INVALIDDATA; |
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goto fail; |
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} |
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if (hdr2.frame_type == EAC3_FRAME_TYPE_INDEPENDENT || |
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hdr2.frame_type == EAC3_FRAME_TYPE_AC3_CONVERT) { |
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pkt->size -= hdr.frame_size; |
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pkt->data += hdr.frame_size; |
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} else { |
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pkt->size = 0; |
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} |
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} else { |
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pkt->size = 0; |
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} |
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return 0; |
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fail: |
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av_packet_unref(pkt); |
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return ret; |
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} |
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static const enum AVCodecID codec_ids[] = { |
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AV_CODEC_ID_EAC3, AV_CODEC_ID_NONE, |
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}; |
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const AVBitStreamFilter ff_eac3_core_bsf = { |
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.name = "eac3_core", |
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.filter = eac3_core_filter, |
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.codec_ids = codec_ids, |
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}; |