| 1 | /* |
| 2 | * ACT file format 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 | #include "avformat.h" |
| 22 | #include "riff.h" |
| 23 | #include "internal.h" |
| 24 | #include "libavcodec/get_bits.h" |
| 25 | |
| 26 | #define CHUNK_SIZE 512 |
| 27 | #define RIFF_TAG MKTAG('R','I','F','F') |
| 28 | #define WAVE_TAG MKTAG('W','A','V','E') |
| 29 | |
| 30 | typedef struct{ |
| 31 | int bytes_left_in_chunk; |
| 32 | uint8_t audio_buffer[22];///< temporary buffer for ACT frame |
| 33 | char second_packet; ///< 1 - if temporary buffer contains valid (second) G.729 packet |
| 34 | } ACTContext; |
| 35 | |
| 36 | static int probe(AVProbeData *p) |
| 37 | { |
| 38 | int i; |
| 39 | |
| 40 | if ((AV_RL32(&p->buf[0]) != RIFF_TAG) || |
| 41 | (AV_RL32(&p->buf[8]) != WAVE_TAG) || |
| 42 | (AV_RL32(&p->buf[16]) != 16)) |
| 43 | return 0; |
| 44 | |
| 45 | //We can't be sure that this is ACT and not regular WAV |
| 46 | if (p->buf_size<512) |
| 47 | return 0; |
| 48 | |
| 49 | for(i=44; i<256; i++) |
| 50 | if(p->buf[i]) |
| 51 | return 0; |
| 52 | |
| 53 | if(p->buf[256]!=0x84) |
| 54 | return 0; |
| 55 | |
| 56 | for(i=264; i<512; i++) |
| 57 | if(p->buf[i]) |
| 58 | return 0; |
| 59 | |
| 60 | return AVPROBE_SCORE_MAX; |
| 61 | } |
| 62 | |
| 63 | static int read_header(AVFormatContext *s) |
| 64 | { |
| 65 | ACTContext* ctx = s->priv_data; |
| 66 | AVIOContext *pb = s->pb; |
| 67 | int size; |
| 68 | AVStream* st; |
| 69 | |
| 70 | int min,sec,msec; |
| 71 | |
| 72 | st = avformat_new_stream(s, NULL); |
| 73 | if (!st) |
| 74 | return AVERROR(ENOMEM); |
| 75 | |
| 76 | avio_skip(pb, 16); |
| 77 | size=avio_rl32(pb); |
| 78 | ff_get_wav_header(pb, st->codec, size); |
| 79 | |
| 80 | /* |
| 81 | 8000Hz (Fine-rec) file format has 10 bytes long |
| 82 | packets with 10ms of sound data in them |
| 83 | */ |
| 84 | if (st->codec->sample_rate != 8000) { |
| 85 | av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codec->sample_rate); |
| 86 | return AVERROR_INVALIDDATA; |
| 87 | } |
| 88 | |
| 89 | st->codec->frame_size=80; |
| 90 | st->codec->channels=1; |
| 91 | avpriv_set_pts_info(st, 64, 1, 100); |
| 92 | |
| 93 | st->codec->codec_id=AV_CODEC_ID_G729; |
| 94 | |
| 95 | avio_seek(pb, 257, SEEK_SET); |
| 96 | msec=avio_rl16(pb); |
| 97 | sec=avio_r8(pb); |
| 98 | min=avio_rl32(pb); |
| 99 | |
| 100 | st->duration = av_rescale(1000*(min*60+sec)+msec, st->codec->sample_rate, 1000 * st->codec->frame_size); |
| 101 | |
| 102 | ctx->bytes_left_in_chunk=CHUNK_SIZE; |
| 103 | |
| 104 | avio_seek(pb, 512, SEEK_SET); |
| 105 | |
| 106 | return 0; |
| 107 | } |
| 108 | |
| 109 | |
| 110 | static int read_packet(AVFormatContext *s, |
| 111 | AVPacket *pkt) |
| 112 | { |
| 113 | ACTContext *ctx = s->priv_data; |
| 114 | AVIOContext *pb = s->pb; |
| 115 | int ret; |
| 116 | int frame_size=s->streams[0]->codec->sample_rate==8000?10:22; |
| 117 | |
| 118 | |
| 119 | if(s->streams[0]->codec->sample_rate==8000) |
| 120 | ret=av_new_packet(pkt, 10); |
| 121 | else |
| 122 | ret=av_new_packet(pkt, 11); |
| 123 | |
| 124 | if(ret) |
| 125 | return ret; |
| 126 | |
| 127 | if(s->streams[0]->codec->sample_rate==4400 && !ctx->second_packet) |
| 128 | { |
| 129 | ret = avio_read(pb, ctx->audio_buffer, frame_size); |
| 130 | |
| 131 | if(ret<0) |
| 132 | return ret; |
| 133 | if(ret!=frame_size) |
| 134 | return AVERROR(EIO); |
| 135 | |
| 136 | pkt->data[0]=ctx->audio_buffer[11]; |
| 137 | pkt->data[1]=ctx->audio_buffer[0]; |
| 138 | pkt->data[2]=ctx->audio_buffer[12]; |
| 139 | pkt->data[3]=ctx->audio_buffer[1]; |
| 140 | pkt->data[4]=ctx->audio_buffer[13]; |
| 141 | pkt->data[5]=ctx->audio_buffer[2]; |
| 142 | pkt->data[6]=ctx->audio_buffer[14]; |
| 143 | pkt->data[7]=ctx->audio_buffer[3]; |
| 144 | pkt->data[8]=ctx->audio_buffer[15]; |
| 145 | pkt->data[9]=ctx->audio_buffer[4]; |
| 146 | pkt->data[10]=ctx->audio_buffer[16]; |
| 147 | |
| 148 | ctx->second_packet=1; |
| 149 | } |
| 150 | else if(s->streams[0]->codec->sample_rate==4400 && ctx->second_packet) |
| 151 | { |
| 152 | pkt->data[0]=ctx->audio_buffer[5]; |
| 153 | pkt->data[1]=ctx->audio_buffer[17]; |
| 154 | pkt->data[2]=ctx->audio_buffer[6]; |
| 155 | pkt->data[3]=ctx->audio_buffer[18]; |
| 156 | pkt->data[4]=ctx->audio_buffer[7]; |
| 157 | pkt->data[5]=ctx->audio_buffer[19]; |
| 158 | pkt->data[6]=ctx->audio_buffer[8]; |
| 159 | pkt->data[7]=ctx->audio_buffer[20]; |
| 160 | pkt->data[8]=ctx->audio_buffer[9]; |
| 161 | pkt->data[9]=ctx->audio_buffer[21]; |
| 162 | pkt->data[10]=ctx->audio_buffer[10]; |
| 163 | |
| 164 | ctx->second_packet=0; |
| 165 | } |
| 166 | else // 8000 Hz |
| 167 | { |
| 168 | ret = avio_read(pb, ctx->audio_buffer, frame_size); |
| 169 | |
| 170 | if(ret<0) |
| 171 | return ret; |
| 172 | if(ret!=frame_size) |
| 173 | return AVERROR(EIO); |
| 174 | |
| 175 | pkt->data[0]=ctx->audio_buffer[5]; |
| 176 | pkt->data[1]=ctx->audio_buffer[0]; |
| 177 | pkt->data[2]=ctx->audio_buffer[6]; |
| 178 | pkt->data[3]=ctx->audio_buffer[1]; |
| 179 | pkt->data[4]=ctx->audio_buffer[7]; |
| 180 | pkt->data[5]=ctx->audio_buffer[2]; |
| 181 | pkt->data[6]=ctx->audio_buffer[8]; |
| 182 | pkt->data[7]=ctx->audio_buffer[3]; |
| 183 | pkt->data[8]=ctx->audio_buffer[9]; |
| 184 | pkt->data[9]=ctx->audio_buffer[4]; |
| 185 | } |
| 186 | |
| 187 | ctx->bytes_left_in_chunk -= frame_size; |
| 188 | |
| 189 | if(ctx->bytes_left_in_chunk < frame_size) |
| 190 | { |
| 191 | avio_skip(pb, ctx->bytes_left_in_chunk); |
| 192 | ctx->bytes_left_in_chunk=CHUNK_SIZE; |
| 193 | } |
| 194 | |
| 195 | pkt->duration=1; |
| 196 | |
| 197 | return ret; |
| 198 | } |
| 199 | |
| 200 | AVInputFormat ff_act_demuxer = { |
| 201 | .name = "act", |
| 202 | .long_name = "ACT Voice file format", |
| 203 | .priv_data_size = sizeof(ACTContext), |
| 204 | .read_probe = probe, |
| 205 | .read_header = read_header, |
| 206 | .read_packet = read_packet, |
| 207 | }; |