| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * G.729 bit format muxer and demuxer | ||
| 3 | * Copyright (c) 2007-2008 Vladimir Voroshilov | ||
| 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 "config_components.h" | ||
| 23 | |||
| 24 | #include "avformat.h" | ||
| 25 | #include "internal.h" | ||
| 26 | #include "mux.h" | ||
| 27 | #include "libavcodec/get_bits.h" | ||
| 28 | #include "libavcodec/put_bits.h" | ||
| 29 | |||
| 30 | #define MAX_FRAME_SIZE 10 | ||
| 31 | |||
| 32 | #define SYNC_WORD 0x6b21 | ||
| 33 | #define BIT_0 0x7f | ||
| 34 | #define BIT_1 0x81 | ||
| 35 | |||
| 36 | #if CONFIG_BIT_DEMUXER | ||
| 37 | 6938 | static int probe(const AVProbeData *p) | |
| 38 | { | ||
| 39 | 6938 | int i = 0, j, valid = 0; | |
| 40 | |||
| 41 |
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6938 | while (2 * i + 3 < p->buf_size){ |
| 42 |
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6938 | if (AV_RL16(&p->buf[2 * i++]) != SYNC_WORD) |
| 43 | 6938 | return 0; | |
| 44 | ✗ | j = AV_RL16(&p->buf[2 * i++]); | |
| 45 | ✗ | if (j != 0 && j != 0x10 && j != 0x40 && j != 0x50 && j != 0x76) | |
| 46 | ✗ | return 0; | |
| 47 | ✗ | if (j) | |
| 48 | ✗ | valid++; | |
| 49 | ✗ | i += j; | |
| 50 | } | ||
| 51 | ✗ | if (valid > 10) | |
| 52 | ✗ | return AVPROBE_SCORE_MAX; | |
| 53 | ✗ | if (valid > 2) | |
| 54 | ✗ | return AVPROBE_SCORE_EXTENSION - 1; | |
| 55 | ✗ | return 0; | |
| 56 | } | ||
| 57 | |||
| 58 | ✗ | static int read_header(AVFormatContext *s) | |
| 59 | { | ||
| 60 | AVStream* st; | ||
| 61 | |||
| 62 | ✗ | st=avformat_new_stream(s, NULL); | |
| 63 | ✗ | if (!st) | |
| 64 | ✗ | return AVERROR(ENOMEM); | |
| 65 | |||
| 66 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 67 | ✗ | st->codecpar->codec_id=AV_CODEC_ID_G729; | |
| 68 | ✗ | st->codecpar->sample_rate=8000; | |
| 69 | ✗ | st->codecpar->block_align = 16; | |
| 70 | ✗ | st->codecpar->ch_layout.nb_channels = 1; | |
| 71 | |||
| 72 | ✗ | avpriv_set_pts_info(st, 64, 1, 100); | |
| 73 | ✗ | return 0; | |
| 74 | } | ||
| 75 | |||
| 76 | ✗ | static int read_packet(AVFormatContext *s, | |
| 77 | AVPacket *pkt) | ||
| 78 | { | ||
| 79 | ✗ | AVIOContext *pb = s->pb; | |
| 80 | PutBitContext pbo; | ||
| 81 | uint16_t buf[8 * MAX_FRAME_SIZE + 2]; | ||
| 82 | int packet_size; | ||
| 83 | ✗ | uint16_t* src=buf; | |
| 84 | int i, j, ret; | ||
| 85 | ✗ | int64_t pos= avio_tell(pb); | |
| 86 | |||
| 87 | ✗ | if(avio_feof(pb)) | |
| 88 | ✗ | return AVERROR_EOF; | |
| 89 | |||
| 90 | ✗ | avio_rl16(pb); // sync word | |
| 91 | ✗ | packet_size = avio_rl16(pb) / 8; | |
| 92 | ✗ | if(packet_size > MAX_FRAME_SIZE) | |
| 93 | ✗ | return AVERROR_INVALIDDATA; | |
| 94 | |||
| 95 | ✗ | ret = avio_read(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t)); | |
| 96 | ✗ | if(ret<0) | |
| 97 | ✗ | return ret; | |
| 98 | ✗ | if(ret != 8 * packet_size * sizeof(uint16_t)) | |
| 99 | ✗ | return AVERROR(EIO); | |
| 100 | |||
| 101 | ✗ | if ((ret = av_new_packet(pkt, packet_size)) < 0) | |
| 102 | ✗ | return ret; | |
| 103 | |||
| 104 | ✗ | init_put_bits(&pbo, pkt->data, packet_size); | |
| 105 | ✗ | for(j=0; j < packet_size; j++) | |
| 106 | ✗ | for(i=0; i<8;i++) | |
| 107 | ✗ | put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0); | |
| 108 | |||
| 109 | ✗ | flush_put_bits(&pbo); | |
| 110 | |||
| 111 | ✗ | pkt->duration=1; | |
| 112 | ✗ | pkt->pos = pos; | |
| 113 | ✗ | return 0; | |
| 114 | } | ||
| 115 | |||
| 116 | const AVInputFormat ff_bit_demuxer = { | ||
| 117 | .name = "bit", | ||
| 118 | .long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), | ||
| 119 | .read_probe = probe, | ||
| 120 | .read_header = read_header, | ||
| 121 | .read_packet = read_packet, | ||
| 122 | .extensions = "bit", | ||
| 123 | }; | ||
| 124 | #endif | ||
| 125 | |||
| 126 | #if CONFIG_BIT_MUXER | ||
| 127 | ✗ | static int write_header(AVFormatContext *s) | |
| 128 | { | ||
| 129 | ✗ | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 130 | |||
| 131 | ✗ | if ((par->codec_id != AV_CODEC_ID_G729) || par->ch_layout.nb_channels != 1) { | |
| 132 | ✗ | av_log(s, AV_LOG_ERROR, | |
| 133 | "only codec g729 with 1 channel is supported by this format\n"); | ||
| 134 | ✗ | return AVERROR(EINVAL); | |
| 135 | } | ||
| 136 | |||
| 137 | ✗ | par->bits_per_coded_sample = 16; | |
| 138 | ✗ | par->block_align = (par->bits_per_coded_sample * par->ch_layout.nb_channels) >> 3; | |
| 139 | |||
| 140 | ✗ | return 0; | |
| 141 | } | ||
| 142 | |||
| 143 | ✗ | static int write_packet(AVFormatContext *s, AVPacket *pkt) | |
| 144 | { | ||
| 145 | ✗ | AVIOContext *pb = s->pb; | |
| 146 | GetBitContext gb; | ||
| 147 | int i; | ||
| 148 | |||
| 149 | ✗ | if (pkt->size != 10) | |
| 150 | ✗ | return AVERROR(EINVAL); | |
| 151 | |||
| 152 | ✗ | avio_wl16(pb, SYNC_WORD); | |
| 153 | ✗ | avio_wl16(pb, 8 * pkt->size); | |
| 154 | |||
| 155 | ✗ | init_get_bits(&gb, pkt->data, 8 * pkt->size); | |
| 156 | ✗ | for (i = 0; i < 8 * pkt->size; i++) | |
| 157 | ✗ | avio_wl16(pb, get_bits1(&gb) ? BIT_1 : BIT_0); | |
| 158 | |||
| 159 | ✗ | return 0; | |
| 160 | } | ||
| 161 | |||
| 162 | const FFOutputFormat ff_bit_muxer = { | ||
| 163 | .p.name = "bit", | ||
| 164 | .p.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), | ||
| 165 | .p.mime_type = "audio/bit", | ||
| 166 | .p.extensions = "bit", | ||
| 167 | .p.audio_codec = AV_CODEC_ID_G729, | ||
| 168 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 169 | .write_header = write_header, | ||
| 170 | .write_packet = write_packet, | ||
| 171 | }; | ||
| 172 | #endif | ||
| 173 |