| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * SBC parser | ||
| 3 | * | ||
| 4 | * Copyright (C) 2017 Aurelien Jacobs <aurel@gnuage.org> | ||
| 5 | * | ||
| 6 | * This file is part of FFmpeg. | ||
| 7 | * | ||
| 8 | * FFmpeg is free software; you can redistribute it and/or | ||
| 9 | * modify it under the terms of the GNU Lesser General Public | ||
| 10 | * License as published by the Free Software Foundation; either | ||
| 11 | * version 2.1 of the License, or (at your option) any later version. | ||
| 12 | * | ||
| 13 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 16 | * Lesser General Public License for more details. | ||
| 17 | * | ||
| 18 | * You should have received a copy of the GNU Lesser General Public | ||
| 19 | * License along with FFmpeg; if not, write to the Free Software | ||
| 20 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 21 | */ | ||
| 22 | |||
| 23 | #include "sbc.h" | ||
| 24 | #include "parser.h" | ||
| 25 | |||
| 26 | typedef struct SBCParseContext { | ||
| 27 | ParseContext pc; | ||
| 28 | uint8_t header[3]; | ||
| 29 | int header_size; | ||
| 30 | int buffered_size; | ||
| 31 | } SBCParseContext; | ||
| 32 | |||
| 33 | ✗ | static int sbc_parse_header(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 34 | const uint8_t *data, size_t len) | ||
| 35 | { | ||
| 36 | static const int sample_rates[4] = { 16000, 32000, 44100, 48000 }; | ||
| 37 | int sr, blocks, mode, subbands, bitpool, channels, joint; | ||
| 38 | int length; | ||
| 39 | |||
| 40 | ✗ | if (len < 3) | |
| 41 | ✗ | return -1; | |
| 42 | |||
| 43 | ✗ | if (data[0] == MSBC_SYNCWORD && data[1] == 0 && data[2] == 0) { | |
| 44 | ✗ | av_channel_layout_uninit(&avctx->ch_layout); | |
| 45 | ✗ | avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; | |
| 46 | ✗ | avctx->ch_layout.nb_channels = 1; | |
| 47 | ✗ | avctx->sample_rate = 16000; | |
| 48 | ✗ | avctx->frame_size = 120; | |
| 49 | ✗ | s->duration = avctx->frame_size; | |
| 50 | ✗ | return 57; | |
| 51 | } | ||
| 52 | |||
| 53 | ✗ | if (data[0] != SBC_SYNCWORD) | |
| 54 | ✗ | return -2; | |
| 55 | |||
| 56 | ✗ | sr = (data[1] >> 6) & 0x03; | |
| 57 | ✗ | blocks = (((data[1] >> 4) & 0x03) + 1) << 2; | |
| 58 | ✗ | mode = (data[1] >> 2) & 0x03; | |
| 59 | ✗ | subbands = (((data[1] >> 0) & 0x01) + 1) << 2; | |
| 60 | ✗ | bitpool = data[2]; | |
| 61 | |||
| 62 | ✗ | channels = mode == SBC_MODE_MONO ? 1 : 2; | |
| 63 | ✗ | joint = mode == SBC_MODE_JOINT_STEREO; | |
| 64 | |||
| 65 | ✗ | length = 4 + (subbands * channels) / 2 | |
| 66 | ✗ | + ((((mode == SBC_MODE_DUAL_CHANNEL) + 1) * blocks * bitpool | |
| 67 | ✗ | + (joint * subbands)) + 7) / 8; | |
| 68 | |||
| 69 | ✗ | av_channel_layout_uninit(&avctx->ch_layout); | |
| 70 | ✗ | avctx->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC; | |
| 71 | ✗ | avctx->ch_layout.nb_channels = channels; | |
| 72 | ✗ | avctx->sample_rate = sample_rates[sr]; | |
| 73 | ✗ | avctx->frame_size = subbands * blocks; | |
| 74 | ✗ | s->duration = avctx->frame_size; | |
| 75 | ✗ | return length; | |
| 76 | } | ||
| 77 | |||
| 78 | ✗ | static int sbc_parse(AVCodecParserContext *s, AVCodecContext *avctx, | |
| 79 | const uint8_t **poutbuf, int *poutbuf_size, | ||
| 80 | const uint8_t *buf, int buf_size) | ||
| 81 | { | ||
| 82 | ✗ | SBCParseContext *pc = s->priv_data; | |
| 83 | int next; | ||
| 84 | |||
| 85 | ✗ | if (s->flags & PARSER_FLAG_COMPLETE_FRAMES) { | |
| 86 | ✗ | next = buf_size; | |
| 87 | } else { | ||
| 88 | ✗ | if (pc->header_size) { | |
| 89 | ✗ | memcpy(pc->header + pc->header_size, buf, | |
| 90 | ✗ | sizeof(pc->header) - pc->header_size); | |
| 91 | ✗ | next = sbc_parse_header(s, avctx, pc->header, sizeof(pc->header)) | |
| 92 | ✗ | - pc->buffered_size; | |
| 93 | ✗ | pc->header_size = 0; | |
| 94 | } else { | ||
| 95 | ✗ | next = sbc_parse_header(s, avctx, buf, buf_size); | |
| 96 | ✗ | if (next >= buf_size) | |
| 97 | ✗ | next = -1; | |
| 98 | } | ||
| 99 | |||
| 100 | ✗ | if (next < 0) { | |
| 101 | ✗ | pc->header_size = FFMIN(sizeof(pc->header), buf_size); | |
| 102 | ✗ | memcpy(pc->header, buf, pc->header_size); | |
| 103 | ✗ | pc->buffered_size = buf_size; | |
| 104 | ✗ | next = END_NOT_FOUND; | |
| 105 | } | ||
| 106 | |||
| 107 | ✗ | if (ff_combine_frame(&pc->pc, next, &buf, &buf_size) < 0) { | |
| 108 | ✗ | *poutbuf = NULL; | |
| 109 | ✗ | *poutbuf_size = 0; | |
| 110 | ✗ | return buf_size; | |
| 111 | } | ||
| 112 | } | ||
| 113 | |||
| 114 | ✗ | *poutbuf = buf; | |
| 115 | ✗ | *poutbuf_size = buf_size; | |
| 116 | ✗ | return next; | |
| 117 | } | ||
| 118 | |||
| 119 | const AVCodecParser ff_sbc_parser = { | ||
| 120 | .codec_ids = { AV_CODEC_ID_SBC }, | ||
| 121 | .priv_data_size = sizeof(SBCParseContext), | ||
| 122 | .parser_parse = sbc_parse, | ||
| 123 | .parser_close = ff_parse_close, | ||
| 124 | }; | ||
| 125 |