1 /*
2 * GENH demuxer
3 * Copyright (c) 2015 Paul B Mahol
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
22 #include "libavutil/intreadwrite.h"
23 #include "libavcodec/internal.h"
24 #include "avformat.h"
25 #include "internal.h"
26
27 typedef struct GENHDemuxContext {
28 unsigned dsp_int_type;
29 unsigned interleave_size;
30 } GENHDemuxContext;
31
genh_probe(const AVProbeData * p)32 static int genh_probe(const AVProbeData *p)
33 {
34 if (AV_RL32(p->buf) != MKTAG('G','E','N','H'))
35 return 0;
36 if (AV_RL32(p->buf+4) <= 0 || AV_RL32(p->buf+4) > 0xFFFF) // channels
37 return 0;
38
39 return AVPROBE_SCORE_MAX / 3 * 2;
40 }
41
genh_read_header(AVFormatContext * s)42 static int genh_read_header(AVFormatContext *s)
43 {
44 unsigned start_offset, header_size, codec, coef_type, coef[2];
45 GENHDemuxContext *c = s->priv_data;
46 av_unused unsigned coef_splitted[2];
47 int align, ch, ret;
48 AVStream *st;
49
50 avio_skip(s->pb, 4);
51
52 st = avformat_new_stream(s, NULL);
53 if (!st)
54 return AVERROR(ENOMEM);
55
56 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
57 st->codecpar->channels = avio_rl32(s->pb);
58 if (st->codecpar->channels <= 0 || st->codecpar->channels > FF_SANE_NB_CHANNELS)
59 return AVERROR_INVALIDDATA;
60 if (st->codecpar->channels == 1)
61 st->codecpar->channel_layout = AV_CH_LAYOUT_MONO;
62 else if (st->codecpar->channels == 2)
63 st->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
64 align =
65 c->interleave_size = avio_rl32(s->pb);
66 if (align < 0 || align > INT_MAX / st->codecpar->channels)
67 return AVERROR_INVALIDDATA;
68 st->codecpar->block_align = align * st->codecpar->channels;
69 st->codecpar->sample_rate = avio_rl32(s->pb);
70 avio_skip(s->pb, 4);
71 st->duration = avio_rl32(s->pb);
72
73 codec = avio_rl32(s->pb);
74 switch (codec) {
75 case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
76 case 1:
77 case 11: st->codecpar->bits_per_coded_sample = 4;
78 st->codecpar->block_align = 36 * st->codecpar->channels;
79 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
80 case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
81 case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
82 AV_CODEC_ID_PCM_S16BE_PLANAR :
83 AV_CODEC_ID_PCM_S16BE; break;
84 case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
85 AV_CODEC_ID_PCM_S16LE_PLANAR :
86 AV_CODEC_ID_PCM_S16LE; break;
87 case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
88 AV_CODEC_ID_PCM_S8_PLANAR :
89 AV_CODEC_ID_PCM_S8; break;
90 case 6: if (st->codecpar->block_align > INT_MAX/1024)
91 return AVERROR_INVALIDDATA;
92 st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
93 case 7: ret = ff_alloc_extradata(st->codecpar, 2);
94 if (ret < 0)
95 return ret;
96 AV_WL16(st->codecpar->extradata, 3);
97 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
98 case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
99 case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
100 case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
101 case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
102 default:
103 avpriv_request_sample(s, "codec %d", codec);
104 return AVERROR_PATCHWELCOME;
105 }
106
107 start_offset = avio_rl32(s->pb);
108 header_size = avio_rl32(s->pb);
109
110 if (header_size > start_offset)
111 return AVERROR_INVALIDDATA;
112
113 if (header_size == 0)
114 start_offset = 0x800;
115
116 coef[0] = avio_rl32(s->pb);
117 coef[1] = avio_rl32(s->pb);
118 c->dsp_int_type = avio_rl32(s->pb);
119 coef_type = avio_rl32(s->pb);
120 coef_splitted[0] = avio_rl32(s->pb);
121 coef_splitted[1] = avio_rl32(s->pb);
122
123 if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
124 if (st->codecpar->channels > 2) {
125 avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
126 return AVERROR_PATCHWELCOME;
127 }
128
129 ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
130 for (ch = 0; ch < st->codecpar->channels; ch++) {
131 if (coef_type & 1) {
132 avpriv_request_sample(s, "coef_type & 1");
133 return AVERROR_PATCHWELCOME;
134 } else {
135 avio_seek(s->pb, coef[ch], SEEK_SET);
136 avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
137 }
138 }
139
140 if (c->dsp_int_type == 1) {
141 st->codecpar->block_align = 8 * st->codecpar->channels;
142 if (c->interleave_size != 1 &&
143 c->interleave_size != 2 &&
144 c->interleave_size != 4)
145 return AVERROR_INVALIDDATA;
146 }
147 }
148
149 if (st->codecpar->block_align <= 0)
150 return AVERROR_INVALIDDATA;
151
152 avio_skip(s->pb, start_offset - avio_tell(s->pb));
153
154 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
155
156 return 0;
157 }
158
genh_read_packet(AVFormatContext * s,AVPacket * pkt)159 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
160 {
161 AVCodecParameters *par = s->streams[0]->codecpar;
162 GENHDemuxContext *c = s->priv_data;
163 int ret;
164
165 if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
166 par->channels > 1) {
167 int i, ch;
168
169 if (avio_feof(s->pb))
170 return AVERROR_EOF;
171 ret = av_new_packet(pkt, 8 * par->channels);
172 if (ret < 0)
173 return ret;
174 for (i = 0; i < 8 / c->interleave_size; i++) {
175 for (ch = 0; ch < par->channels; ch++) {
176 pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
177 pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
178 }
179 }
180 ret = 0;
181 } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
182 ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
183
184 } else {
185 ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);
186 }
187
188 pkt->stream_index = 0;
189 return ret;
190 }
191
192 AVInputFormat ff_genh_demuxer = {
193 .name = "genh",
194 .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
195 .priv_data_size = sizeof(GENHDemuxContext),
196 .read_probe = genh_probe,
197 .read_header = genh_read_header,
198 .read_packet = genh_read_packet,
199 .extensions = "genh",
200 };
201