2 * ACT file format demuxer
3 * Copyright (c) 2007-2008 Vladimir Voroshilov
5 * This file is part of FFmpeg.
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.
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.
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
24 #include "libavcodec/get_bits.h"
26 #define CHUNK_SIZE 512
27 #define RIFF_TAG MKTAG('R','I','F','F')
28 #define WAVE_TAG MKTAG('W','A','V','E')
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
36 static int probe(AVProbeData *p)
40 if ((AV_RL32(&p->buf[0]) != RIFF_TAG) ||
41 (AV_RL32(&p->buf[8]) != WAVE_TAG) ||
42 (AV_RL32(&p->buf[16]) != 16))
45 //We cant be sure that this is ACT and not regular WAV
56 for(i=264; i<512; i++)
60 return AVPROBE_SCORE_MAX;
63 static int read_header(AVFormatContext *s,
64 AVFormatParameters *ap)
66 ACTContext* ctx = s->priv_data;
67 AVIOContext *pb = s->pb;
73 st = avformat_new_stream(s, NULL);
75 return AVERROR(ENOMEM);
79 ff_get_wav_header(pb, st->codec, size);
82 8000Hz (Fine-rec) file format has 10 bytes long
83 packets with 10ms of sound data in them
85 if (st->codec->sample_rate != 8000) {
86 av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codec->sample_rate);
87 return AVERROR_INVALIDDATA;
90 st->codec->frame_size=80;
91 st->codec->channels=1;
92 avpriv_set_pts_info(st, 64, 1, 100);
94 st->codec->codec_id=CODEC_ID_G729;
96 avio_seek(pb, 257, SEEK_SET);
101 st->duration = av_rescale(1000*(min*60+sec)+msec, st->codec->sample_rate, 1000 * st->codec->frame_size);
103 ctx->bytes_left_in_chunk=CHUNK_SIZE;
105 avio_seek(pb, 512, SEEK_SET);
111 static int read_packet(AVFormatContext *s,
114 ACTContext *ctx = s->priv_data;
115 AVIOContext *pb = s->pb;
117 int frame_size=s->streams[0]->codec->sample_rate==8000?10:22;
120 if(s->streams[0]->codec->sample_rate==8000)
121 ret=av_new_packet(pkt, 10);
123 ret=av_new_packet(pkt, 11);
128 if(s->streams[0]->codec->sample_rate==4400 && !ctx->second_packet)
130 ret = avio_read(pb, ctx->audio_buffer, frame_size);
137 pkt->data[0]=ctx->audio_buffer[11];
138 pkt->data[1]=ctx->audio_buffer[0];
139 pkt->data[2]=ctx->audio_buffer[12];
140 pkt->data[3]=ctx->audio_buffer[1];
141 pkt->data[4]=ctx->audio_buffer[13];
142 pkt->data[5]=ctx->audio_buffer[2];
143 pkt->data[6]=ctx->audio_buffer[14];
144 pkt->data[7]=ctx->audio_buffer[3];
145 pkt->data[8]=ctx->audio_buffer[15];
146 pkt->data[9]=ctx->audio_buffer[4];
147 pkt->data[10]=ctx->audio_buffer[16];
149 ctx->second_packet=1;
151 else if(s->streams[0]->codec->sample_rate==4400 && ctx->second_packet)
153 pkt->data[0]=ctx->audio_buffer[5];
154 pkt->data[1]=ctx->audio_buffer[17];
155 pkt->data[2]=ctx->audio_buffer[6];
156 pkt->data[3]=ctx->audio_buffer[18];
157 pkt->data[4]=ctx->audio_buffer[7];
158 pkt->data[5]=ctx->audio_buffer[19];
159 pkt->data[6]=ctx->audio_buffer[8];
160 pkt->data[7]=ctx->audio_buffer[20];
161 pkt->data[8]=ctx->audio_buffer[9];
162 pkt->data[9]=ctx->audio_buffer[21];
163 pkt->data[10]=ctx->audio_buffer[10];
165 ctx->second_packet=0;
169 ret = avio_read(pb, ctx->audio_buffer, frame_size);
176 pkt->data[0]=ctx->audio_buffer[5];
177 pkt->data[1]=ctx->audio_buffer[0];
178 pkt->data[2]=ctx->audio_buffer[6];
179 pkt->data[3]=ctx->audio_buffer[1];
180 pkt->data[4]=ctx->audio_buffer[7];
181 pkt->data[5]=ctx->audio_buffer[2];
182 pkt->data[6]=ctx->audio_buffer[8];
183 pkt->data[7]=ctx->audio_buffer[3];
184 pkt->data[8]=ctx->audio_buffer[9];
185 pkt->data[9]=ctx->audio_buffer[4];
188 ctx->bytes_left_in_chunk -= frame_size;
190 if(ctx->bytes_left_in_chunk < frame_size)
192 avio_skip(pb, ctx->bytes_left_in_chunk);
193 ctx->bytes_left_in_chunk=CHUNK_SIZE;
201 AVInputFormat ff_act_demuxer = {
203 .long_name = "ACT Voice file format",
204 .priv_data_size = sizeof(ACTContext),
206 .read_header = read_header,
207 .read_packet = read_packet,