| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * Copyright (c) 2021 Paul B Mahol | ||
| 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 | /** | ||
| 22 | * @file | ||
| 23 | * AMR audio parser | ||
| 24 | * | ||
| 25 | * Splits packets into individual blocks. | ||
| 26 | */ | ||
| 27 | |||
| 28 | #include "libavutil/channel_layout.h" | ||
| 29 | #include "libavutil/intreadwrite.h" | ||
| 30 | #include "parser.h" | ||
| 31 | |||
| 32 | static const uint8_t amrnb_packed_size[16] = { | ||
| 33 | 13, 14, 16, 18, 20, 21, 27, 32, 6, 1, 1, 1, 1, 1, 1, 1 | ||
| 34 | }; | ||
| 35 | static const uint8_t amrwb_packed_size[16] = { | ||
| 36 | 18, 24, 33, 37, 41, 47, 51, 59, 61, 6, 1, 1, 1, 1, 1, 1 | ||
| 37 | }; | ||
| 38 | |||
| 39 | typedef struct AMRParseContext { | ||
| 40 | ParseContext pc; | ||
| 41 | uint64_t cumulated_size; | ||
| 42 | uint64_t block_count; | ||
| 43 | int current_channel; | ||
| 44 | int remaining; | ||
| 45 | } AMRParseContext; | ||
| 46 | |||
| 47 | 24 | static av_cold int amr_parse_init(AVCodecParserContext *s1) | |
| 48 | { | ||
| 49 | 24 | AMRParseContext *s = s1->priv_data; | |
| 50 | 24 | s->remaining = -1; | |
| 51 | 24 | return 0; | |
| 52 | } | ||
| 53 | |||
| 54 | 3057 | static int amr_parse(AVCodecParserContext *s1, | |
| 55 | AVCodecContext *avctx, | ||
| 56 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 57 | const uint8_t *buf, int buf_size) | ||
| 58 | { | ||
| 59 | 3057 | AMRParseContext *s = s1->priv_data; | |
| 60 | 3057 | ParseContext *pc = &s->pc; | |
| 61 | 3057 | int next = END_NOT_FOUND; | |
| 62 | |||
| 63 | 3057 | *poutbuf_size = 0; | |
| 64 | 3057 | *poutbuf = NULL; | |
| 65 | |||
| 66 |
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3057 | if (!avctx->ch_layout.nb_channels) { |
| 67 | ✗ | av_channel_layout_uninit(&avctx->ch_layout); | |
| 68 | ✗ | avctx->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO; | |
| 69 | } | ||
| 70 | |||
| 71 |
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3057 | if (s1->flags & PARSER_FLAG_COMPLETE_FRAMES) { |
| 72 | ✗ | next = buf_size; | |
| 73 | } else { | ||
| 74 | 3057 | int ch, offset = 0; | |
| 75 | |||
| 76 |
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6029 | for (ch = s->current_channel; ch < avctx->ch_layout.nb_channels; ch++) { |
| 77 |
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3057 | if (s->remaining >= 0) { |
| 78 | 73 | next = s->remaining; | |
| 79 | } else { | ||
| 80 | 2984 | int mode = (buf[offset] >> 3) & 0x0F; | |
| 81 | |||
| 82 |
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2984 | if (avctx->codec_id == AV_CODEC_ID_AMR_NB) { |
| 83 | 2916 | next = amrnb_packed_size[mode]; | |
| 84 |
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68 | } else if (avctx->codec_id == AV_CODEC_ID_AMR_WB) { |
| 85 | 68 | next = amrwb_packed_size[mode]; | |
| 86 | } | ||
| 87 | } | ||
| 88 | |||
| 89 | 3057 | offset += next; | |
| 90 |
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3057 | if (offset >= buf_size) { |
| 91 | 85 | s->remaining = offset - buf_size; | |
| 92 | 85 | next = END_NOT_FOUND; | |
| 93 | 85 | break; | |
| 94 | } else { | ||
| 95 | 2972 | s->remaining = -1; | |
| 96 | } | ||
| 97 | } | ||
| 98 | |||
| 99 | 3057 | s->current_channel = ch % avctx->ch_layout.nb_channels; | |
| 100 |
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3057 | if (s->remaining < 0) |
| 101 | 2972 | next = offset; | |
| 102 | |||
| 103 |
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3057 | if (next != END_NOT_FOUND) { |
| 104 |
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2972 | if (s->cumulated_size < UINT64_MAX - next) { |
| 105 | 2972 | s->cumulated_size += next; | |
| 106 | /* Both AMR formats have 50 frames per second */ | ||
| 107 | 2972 | avctx->bit_rate = s->cumulated_size / ++s->block_count * 8 * 50; | |
| 108 | } | ||
| 109 | } | ||
| 110 | |||
| 111 |
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3057 | if (ff_combine_frame(pc, next, &buf, &buf_size) < 0) { |
| 112 | 65 | *poutbuf = NULL; | |
| 113 | 65 | *poutbuf_size = 0; | |
| 114 | 65 | return buf_size; | |
| 115 | } | ||
| 116 | } | ||
| 117 | |||
| 118 |
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2992 | s1->duration = avctx->codec_id == AV_CODEC_ID_AMR_NB ? 160 : 320; |
| 119 | |||
| 120 | 2992 | *poutbuf = buf; | |
| 121 | 2992 | *poutbuf_size = buf_size; | |
| 122 | 2992 | return next; | |
| 123 | } | ||
| 124 | |||
| 125 | const AVCodecParser ff_amr_parser = { | ||
| 126 | .codec_ids = { AV_CODEC_ID_AMR_NB, AV_CODEC_ID_AMR_WB }, | ||
| 127 | .priv_data_size = sizeof(AMRParseContext), | ||
| 128 | .parser_init = amr_parse_init, | ||
| 129 | .parser_parse = amr_parse, | ||
| 130 | .parser_close = ff_parse_close, | ||
| 131 | }; | ||
| 132 |