| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * MPEG-2/4 AAC ADTS to MPEG-4 Audio Specific Configuration bitstream filter | ||
| 3 | * Copyright (c) 2009 Alex Converse <alex.converse@gmail.com> | ||
| 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 "adts_header.h" | ||
| 23 | #include "adts_parser.h" | ||
| 24 | #include "bsf.h" | ||
| 25 | #include "bsf_internal.h" | ||
| 26 | #include "put_bits.h" | ||
| 27 | #include "get_bits.h" | ||
| 28 | #include "mpeg4audio.h" | ||
| 29 | #include "mpeg4audio_copy_pce.h" | ||
| 30 | |||
| 31 | typedef struct AACBSFContext { | ||
| 32 | int first_frame_done; | ||
| 33 | } AACBSFContext; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * This filter creates an MPEG-4 AudioSpecificConfig from an MPEG-2/4 | ||
| 37 | * ADTS header and removes the ADTS header. | ||
| 38 | */ | ||
| 39 | 242 | static int aac_adtstoasc_filter(AVBSFContext *bsfc, AVPacket *pkt) | |
| 40 | { | ||
| 41 | 242 | AACBSFContext *ctx = bsfc->priv_data; | |
| 42 | |||
| 43 | PutBitContext pb; | ||
| 44 | AACADTSHeaderInfo hdr; | ||
| 45 | int ret; | ||
| 46 | |||
| 47 | 242 | ret = ff_bsf_get_packet_ref(bsfc, pkt); | |
| 48 |
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242 | if (ret < 0) |
| 49 | 122 | return ret; | |
| 50 | |||
| 51 |
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120 | if (bsfc->par_in->extradata && pkt->size >= 2 && (AV_RB16(pkt->data) >> 4) != 0xfff) |
| 52 | ✗ | return 0; | |
| 53 | |||
| 54 |
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120 | if (pkt->size < AV_AAC_ADTS_HEADER_SIZE) |
| 55 | ✗ | goto packet_too_small; | |
| 56 | |||
| 57 |
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120 | if (ff_adts_header_parse_buf(pkt->data, &hdr) < 0) { |
| 58 | ✗ | av_log(bsfc, AV_LOG_ERROR, "Error parsing ADTS frame header!\n"); | |
| 59 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 60 | ✗ | goto fail; | |
| 61 | } | ||
| 62 | |||
| 63 |
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120 | if (!hdr.crc_absent && hdr.num_aac_frames > 1) { |
| 64 | ✗ | avpriv_report_missing_feature(bsfc, | |
| 65 | "Multiple RDBs per frame with CRC"); | ||
| 66 | ✗ | ret = AVERROR_PATCHWELCOME; | |
| 67 | ✗ | goto fail; | |
| 68 | } | ||
| 69 | |||
| 70 |
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120 | pkt->size -= AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent; |
| 71 |
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120 | if (pkt->size <= 0) |
| 72 | ✗ | goto packet_too_small; | |
| 73 |
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120 | pkt->data += AV_AAC_ADTS_HEADER_SIZE + 2 * !hdr.crc_absent; |
| 74 | |||
| 75 |
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120 | if (!ctx->first_frame_done) { |
| 76 | 2 | int pce_size = 0; | |
| 77 | uint8_t pce_data[MAX_PCE_SIZE]; | ||
| 78 | uint8_t *extradata; | ||
| 79 | |||
| 80 |
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2 | if (!hdr.chan_config) { |
| 81 | GetBitContext gb; | ||
| 82 | ✗ | init_get_bits(&gb, pkt->data, pkt->size * 8); | |
| 83 | ✗ | if (get_bits(&gb, 3) != 5) { | |
| 84 | ✗ | avpriv_report_missing_feature(bsfc, | |
| 85 | "PCE-based channel configuration " | ||
| 86 | "without PCE as first syntax " | ||
| 87 | "element"); | ||
| 88 | ✗ | ret = AVERROR_PATCHWELCOME; | |
| 89 | ✗ | goto fail; | |
| 90 | } | ||
| 91 | ✗ | init_put_bits(&pb, pce_data, MAX_PCE_SIZE); | |
| 92 | ✗ | pce_size = ff_copy_pce_data(&pb, &gb) / 8; | |
| 93 | ✗ | flush_put_bits(&pb); | |
| 94 | ✗ | pkt->size -= get_bits_count(&gb)/8; | |
| 95 | ✗ | pkt->data += get_bits_count(&gb)/8; | |
| 96 | } | ||
| 97 | |||
| 98 | 2 | extradata = av_packet_new_side_data(pkt, AV_PKT_DATA_NEW_EXTRADATA, | |
| 99 | 2 | 2 + pce_size); | |
| 100 |
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2 | if (!extradata) { |
| 101 | ✗ | ret = AVERROR(ENOMEM); | |
| 102 | ✗ | goto fail; | |
| 103 | } | ||
| 104 | |||
| 105 | 2 | init_put_bits(&pb, extradata, 2 + pce_size); | |
| 106 | 2 | put_bits(&pb, 5, hdr.object_type); | |
| 107 | 2 | put_bits(&pb, 4, hdr.sampling_index); | |
| 108 | 2 | put_bits(&pb, 4, hdr.chan_config); | |
| 109 | 2 | put_bits(&pb, 1, 0); //frame length - 1024 samples | |
| 110 | 2 | put_bits(&pb, 1, 0); //does not depend on core coder | |
| 111 | 2 | put_bits(&pb, 1, 0); //is not extension | |
| 112 | 2 | flush_put_bits(&pb); | |
| 113 |
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2 | if (pce_size) { |
| 114 | ✗ | memcpy(extradata + 2, pce_data, pce_size); | |
| 115 | } | ||
| 116 | |||
| 117 | 2 | ctx->first_frame_done = 1; | |
| 118 | } | ||
| 119 | |||
| 120 | 120 | return 0; | |
| 121 | |||
| 122 | ✗ | packet_too_small: | |
| 123 | ✗ | av_log(bsfc, AV_LOG_ERROR, "Input packet too small\n"); | |
| 124 | ✗ | ret = AVERROR_INVALIDDATA; | |
| 125 | ✗ | fail: | |
| 126 | ✗ | av_packet_unref(pkt); | |
| 127 | ✗ | return ret; | |
| 128 | } | ||
| 129 | |||
| 130 | 2 | static int aac_adtstoasc_init(AVBSFContext *ctx) | |
| 131 | { | ||
| 132 | /* Validate the extradata if the stream is already MPEG-4 AudioSpecificConfig */ | ||
| 133 |
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2 | if (ctx->par_in->extradata) { |
| 134 | MPEG4AudioConfig mp4ac; | ||
| 135 | ✗ | int ret = avpriv_mpeg4audio_get_config2(&mp4ac, ctx->par_in->extradata, | |
| 136 | ✗ | ctx->par_in->extradata_size, 1, ctx); | |
| 137 | ✗ | if (ret < 0) { | |
| 138 | ✗ | av_log(ctx, AV_LOG_ERROR, "Error parsing AudioSpecificConfig extradata!\n"); | |
| 139 | ✗ | return ret; | |
| 140 | } | ||
| 141 | } | ||
| 142 | |||
| 143 | 2 | return 0; | |
| 144 | } | ||
| 145 | |||
| 146 | static const enum AVCodecID codec_ids[] = { | ||
| 147 | AV_CODEC_ID_AAC, AV_CODEC_ID_NONE, | ||
| 148 | }; | ||
| 149 | |||
| 150 | const FFBitStreamFilter ff_aac_adtstoasc_bsf = { | ||
| 151 | .p.name = "aac_adtstoasc", | ||
| 152 | .p.codec_ids = codec_ids, | ||
| 153 | .priv_data_size = sizeof(AACBSFContext), | ||
| 154 | .init = aac_adtstoasc_init, | ||
| 155 | .filter = aac_adtstoasc_filter, | ||
| 156 | }; | ||
| 157 |