| 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 "demux.h" | ||
| 26 | #include "internal.h" | ||
| 27 | #include "mux.h" | ||
| 28 | #include "libavcodec/get_bits.h" | ||
| 29 | #include "libavcodec/put_bits.h" | ||
| 30 | |||
| 31 | #define MAX_FRAME_SIZE 10 | ||
| 32 | |||
| 33 | #define SYNC_WORD 0x6b21 | ||
| 34 | #define BIT_0 0x7f | ||
| 35 | #define BIT_1 0x81 | ||
| 36 | |||
| 37 | #if CONFIG_BIT_DEMUXER | ||
| 38 | 7128 | static int probe(const AVProbeData *p) | |
| 39 | { | ||
| 40 | 7128 | int i = 0, j, valid = 0; | |
| 41 | |||
| 42 |
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7128 | while (2 * i + 3 < p->buf_size){ |
| 43 |
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7128 | if (AV_RL16(&p->buf[2 * i++]) != SYNC_WORD) |
| 44 | 7128 | return 0; | |
| 45 | ✗ | j = AV_RL16(&p->buf[2 * i++]); | |
| 46 | ✗ | if (j != 0 && j != 0x10 && j != 0x40 && j != 0x50 && j != 0x76) | |
| 47 | ✗ | return 0; | |
| 48 | ✗ | if (j) | |
| 49 | ✗ | valid++; | |
| 50 | ✗ | i += j; | |
| 51 | } | ||
| 52 | ✗ | if (valid > 10) | |
| 53 | ✗ | return AVPROBE_SCORE_MAX; | |
| 54 | ✗ | if (valid > 2) | |
| 55 | ✗ | return AVPROBE_SCORE_EXTENSION - 1; | |
| 56 | ✗ | return 0; | |
| 57 | } | ||
| 58 | |||
| 59 | ✗ | static int read_header(AVFormatContext *s) | |
| 60 | { | ||
| 61 | AVStream* st; | ||
| 62 | |||
| 63 | ✗ | st=avformat_new_stream(s, NULL); | |
| 64 | ✗ | if (!st) | |
| 65 | ✗ | return AVERROR(ENOMEM); | |
| 66 | |||
| 67 | ✗ | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; | |
| 68 | ✗ | st->codecpar->codec_id=AV_CODEC_ID_G729; | |
| 69 | ✗ | st->codecpar->sample_rate=8000; | |
| 70 | ✗ | st->codecpar->block_align = 16; | |
| 71 | ✗ | st->codecpar->ch_layout.nb_channels = 1; | |
| 72 | |||
| 73 | ✗ | avpriv_set_pts_info(st, 64, 1, 100); | |
| 74 | ✗ | return 0; | |
| 75 | } | ||
| 76 | |||
| 77 | ✗ | static int read_packet(AVFormatContext *s, | |
| 78 | AVPacket *pkt) | ||
| 79 | { | ||
| 80 | ✗ | AVIOContext *pb = s->pb; | |
| 81 | PutBitContext pbo; | ||
| 82 | uint16_t buf[8 * MAX_FRAME_SIZE + 2]; | ||
| 83 | int packet_size; | ||
| 84 | ✗ | uint16_t* src=buf; | |
| 85 | int i, j, ret; | ||
| 86 | ✗ | int64_t pos= avio_tell(pb); | |
| 87 | |||
| 88 | ✗ | if(avio_feof(pb)) | |
| 89 | ✗ | return AVERROR_EOF; | |
| 90 | |||
| 91 | ✗ | avio_rl16(pb); // sync word | |
| 92 | ✗ | packet_size = avio_rl16(pb) / 8; | |
| 93 | ✗ | if(packet_size > MAX_FRAME_SIZE) | |
| 94 | ✗ | return AVERROR_INVALIDDATA; | |
| 95 | |||
| 96 | ✗ | ret = avio_read(pb, (uint8_t*)buf, (8 * packet_size) * sizeof(uint16_t)); | |
| 97 | ✗ | if(ret<0) | |
| 98 | ✗ | return ret; | |
| 99 | ✗ | if(ret != 8 * packet_size * sizeof(uint16_t)) | |
| 100 | ✗ | return AVERROR(EIO); | |
| 101 | |||
| 102 | ✗ | if ((ret = av_new_packet(pkt, packet_size)) < 0) | |
| 103 | ✗ | return ret; | |
| 104 | |||
| 105 | ✗ | init_put_bits(&pbo, pkt->data, packet_size); | |
| 106 | ✗ | for(j=0; j < packet_size; j++) | |
| 107 | ✗ | for(i=0; i<8;i++) | |
| 108 | ✗ | put_bits(&pbo,1, AV_RL16(src++) == BIT_1 ? 1 : 0); | |
| 109 | |||
| 110 | ✗ | flush_put_bits(&pbo); | |
| 111 | |||
| 112 | ✗ | pkt->duration=1; | |
| 113 | ✗ | pkt->pos = pos; | |
| 114 | ✗ | return 0; | |
| 115 | } | ||
| 116 | |||
| 117 | const FFInputFormat ff_bit_demuxer = { | ||
| 118 | .p.name = "bit", | ||
| 119 | .p.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), | ||
| 120 | .p.extensions = "bit", | ||
| 121 | .read_probe = probe, | ||
| 122 | .read_header = read_header, | ||
| 123 | .read_packet = read_packet, | ||
| 124 | }; | ||
| 125 | #endif | ||
| 126 | |||
| 127 | #if CONFIG_BIT_MUXER | ||
| 128 | ✗ | static av_cold int init(AVFormatContext *s) | |
| 129 | { | ||
| 130 | ✗ | AVCodecParameters *par = s->streams[0]->codecpar; | |
| 131 | |||
| 132 | ✗ | if (par->ch_layout.nb_channels != 1) { | |
| 133 | ✗ | av_log(s, AV_LOG_ERROR, | |
| 134 | "only codec g729 with 1 channel is supported by this format\n"); | ||
| 135 | ✗ | return AVERROR(EINVAL); | |
| 136 | } | ||
| 137 | |||
| 138 | ✗ | par->bits_per_coded_sample = 16; | |
| 139 | ✗ | par->block_align = (par->bits_per_coded_sample * par->ch_layout.nb_channels) >> 3; | |
| 140 | |||
| 141 | ✗ | return 0; | |
| 142 | } | ||
| 143 | |||
| 144 | ✗ | static int write_packet(AVFormatContext *s, AVPacket *pkt) | |
| 145 | { | ||
| 146 | ✗ | AVIOContext *pb = s->pb; | |
| 147 | GetBitContext gb; | ||
| 148 | int i; | ||
| 149 | |||
| 150 | ✗ | if (pkt->size != 10) | |
| 151 | ✗ | return AVERROR(EINVAL); | |
| 152 | |||
| 153 | ✗ | avio_wl16(pb, SYNC_WORD); | |
| 154 | ✗ | avio_wl16(pb, 8 * pkt->size); | |
| 155 | |||
| 156 | ✗ | init_get_bits(&gb, pkt->data, 8 * pkt->size); | |
| 157 | ✗ | for (i = 0; i < 8 * pkt->size; i++) | |
| 158 | ✗ | avio_wl16(pb, get_bits1(&gb) ? BIT_1 : BIT_0); | |
| 159 | |||
| 160 | ✗ | return 0; | |
| 161 | } | ||
| 162 | |||
| 163 | const FFOutputFormat ff_bit_muxer = { | ||
| 164 | .p.name = "bit", | ||
| 165 | .p.long_name = NULL_IF_CONFIG_SMALL("G.729 BIT file format"), | ||
| 166 | .p.mime_type = "audio/bit", | ||
| 167 | .p.extensions = "bit", | ||
| 168 | .p.audio_codec = AV_CODEC_ID_G729, | ||
| 169 | .p.video_codec = AV_CODEC_ID_NONE, | ||
| 170 | .p.subtitle_codec = AV_CODEC_ID_NONE, | ||
| 171 | .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH | | ||
| 172 | FF_OFMT_FLAG_ONLY_DEFAULT_CODECS, | ||
| 173 | .init = init, | ||
| 174 | .write_packet = write_packet, | ||
| 175 | }; | ||
| 176 | #endif | ||
| 177 |