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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 | }; |