| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MXF SMPTE-436M ANC to EIA-608 bitstream filter | ||
| 3 | * Copyright (c) 2025 Jacob Lifshay | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | #include "bsf.h" | ||
| 23 | #include "bsf_internal.h" | ||
| 24 | #include "codec_id.h" | ||
| 25 | #include "libavcodec/smpte_436m.h" | ||
| 26 | #include "libavutil/error.h" | ||
| 27 | |||
| 28 | 1 | static av_cold int ff_smpte436m_to_eia608_init(AVBSFContext *ctx) | |
| 29 | { | ||
| 30 | 1 | ctx->par_out->codec_type = AVMEDIA_TYPE_SUBTITLE; | |
| 31 | 1 | ctx->par_out->codec_id = AV_CODEC_ID_EIA_608; | |
| 32 | 1 | return 0; | |
| 33 | } | ||
| 34 | |||
| 35 | 65 | static int ff_smpte436m_to_eia608_filter(AVBSFContext *ctx, AVPacket *out) | |
| 36 | { | ||
| 37 | AVPacket *in; | ||
| 38 | 65 | int ret = ff_bsf_get_packet(ctx, &in); | |
| 39 |
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65 | if (ret < 0) |
| 40 | 33 | return ret; | |
| 41 | |||
| 42 | AVSmpte436mAncIterator iter; | ||
| 43 | 32 | ret = av_smpte_436m_anc_iter_init(&iter, in->data, in->size); | |
| 44 |
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32 | if (ret < 0) |
| 45 | ✗ | goto fail; | |
| 46 | AVSmpte436mCodedAnc coded_anc; | ||
| 47 |
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32 | while ((ret = av_smpte_436m_anc_iter_next(&iter, &coded_anc)) >= 0) { |
| 48 | AVSmpte291mAnc8bit anc; | ||
| 49 | 32 | ret = av_smpte_291m_anc_8bit_decode( | |
| 50 | 32 | &anc, coded_anc.payload_sample_coding, coded_anc.payload_sample_count, coded_anc.payload, ctx); | |
| 51 |
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32 | if (ret < 0) |
| 52 | ✗ | goto fail; | |
| 53 | 32 | ret = av_smpte_291m_anc_8bit_extract_cta_708(&anc, NULL, ctx); | |
| 54 |
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32 | if (ret == AVERROR(EAGAIN)) |
| 55 | ✗ | continue; | |
| 56 |
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32 | if (ret < 0) |
| 57 | ✗ | goto fail; | |
| 58 | 32 | int cc_count = ret; | |
| 59 | |||
| 60 | 32 | ret = av_new_packet(out, 3 * cc_count); | |
| 61 |
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32 | if (ret < 0) |
| 62 | ✗ | goto fail; | |
| 63 | |||
| 64 | 32 | ret = av_packet_copy_props(out, in); | |
| 65 |
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32 | if (ret < 0) |
| 66 | ✗ | goto fail; | |
| 67 | |||
| 68 | // verified it won't fail by running it above | ||
| 69 | 32 | av_smpte_291m_anc_8bit_extract_cta_708(&anc, out->data, ctx); | |
| 70 | |||
| 71 | 32 | av_packet_free(&in); | |
| 72 | |||
| 73 | 32 | return 0; | |
| 74 | } | ||
| 75 | ✗ | if (ret != AVERROR_EOF) | |
| 76 | ✗ | return ret; | |
| 77 | ✗ | ret = AVERROR(EAGAIN); | |
| 78 | |||
| 79 | ✗ | fail: | |
| 80 | ✗ | if (ret < 0) | |
| 81 | ✗ | av_packet_unref(out); | |
| 82 | ✗ | av_packet_free(&in); | |
| 83 | ✗ | return ret; | |
| 84 | } | ||
| 85 | |||
| 86 | const FFBitStreamFilter ff_smpte436m_to_eia608_bsf = { | ||
| 87 | .p.name = "smpte436m_to_eia608", | ||
| 88 | .p.codec_ids = (const enum AVCodecID[]){ AV_CODEC_ID_SMPTE_436M_ANC, AV_CODEC_ID_NONE }, | ||
| 89 | .init = ff_smpte436m_to_eia608_init, | ||
| 90 | .filter = ff_smpte436m_to_eia608_filter, | ||
| 91 | }; | ||
| 92 |