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
probe(const AVProbeData * p)36 static int probe(const 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
read_header(AVFormatContext * s)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(s, pb, st->codecpar, size, 0);
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->codecpar->sample_rate != 8000) {
85 av_log(s, AV_LOG_ERROR, "Sample rate %d is not supported.\n", st->codecpar->sample_rate);
86 return AVERROR_INVALIDDATA;
87 }
88
89 st->codecpar->frame_size=80;
90 st->codecpar->channels=1;
91 avpriv_set_pts_info(st, 64, 1, 100);
92
93 st->codecpar->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->codecpar->sample_rate, 1000 * st->codecpar->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
read_packet(AVFormatContext * s,AVPacket * pkt)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]->codecpar->sample_rate==8000?10:22;
117
118
119 if(s->streams[0]->codecpar->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]->codecpar->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]->codecpar->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 };
208