blob: fe6741178736e75c655b6902d86e70b043af2242
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(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 | |
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 |