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/channel_layout.h"
23 #include "libavutil/intreadwrite.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->ch_layout.nb_channels = avio_rl32(s->pb);
58 if (st->codecpar->ch_layout.nb_channels <= 0)
59 return AVERROR_INVALIDDATA;
60 if (st->codecpar->ch_layout.nb_channels == 1)
61 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_MONO;
62 else if (st->codecpar->ch_layout.nb_channels == 2)
63 st->codecpar->ch_layout = (AVChannelLayout)AV_CHANNEL_LAYOUT_STEREO;
64 align =
65 c->interleave_size = avio_rl32(s->pb);
66 if (align < 0 || align > INT_MAX / st->codecpar->ch_layout.nb_channels)
67 return AVERROR_INVALIDDATA;
68 st->codecpar->block_align = align * st->codecpar->ch_layout.nb_channels;
69 st->codecpar->sample_rate = avio_rl32(s->pb);
70 if (st->codecpar->sample_rate < 0)
71 return AVERROR_INVALIDDATA;
72
73 avio_skip(s->pb, 4);
74 st->duration = avio_rl32(s->pb);
75
76 codec = avio_rl32(s->pb);
77 switch (codec) {
78 case 0: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_PSX; break;
79 case 1:
80 case 11: st->codecpar->bits_per_coded_sample = 4;
81 if (st->codecpar->ch_layout.nb_channels > INT_MAX / 36)
82 return AVERROR_INVALIDDATA;
83 st->codecpar->block_align = 36 * st->codecpar->ch_layout.nb_channels;
84 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WAV; break;
85 case 2: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_DTK; break;
86 case 3: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
87 AV_CODEC_ID_PCM_S16BE_PLANAR :
88 AV_CODEC_ID_PCM_S16BE; break;
89 case 4: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
90 AV_CODEC_ID_PCM_S16LE_PLANAR :
91 AV_CODEC_ID_PCM_S16LE; break;
92 case 5: st->codecpar->codec_id = st->codecpar->block_align > 0 ?
93 AV_CODEC_ID_PCM_S8_PLANAR :
94 AV_CODEC_ID_PCM_S8; break;
95 case 6: if (st->codecpar->block_align > INT_MAX/1024)
96 return AVERROR_INVALIDDATA;
97 st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
98 case 7: ret = ff_alloc_extradata(st->codecpar, 2);
99 if (ret < 0)
100 return ret;
101 AV_WL16(st->codecpar->extradata, 3);
102 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
103 case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
104 case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
105 case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
106 case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
107 default:
108 avpriv_request_sample(s, "codec %d", codec);
109 return AVERROR_PATCHWELCOME;
110 }
111
112 start_offset = avio_rl32(s->pb);
113 header_size = avio_rl32(s->pb);
114
115 if (header_size > start_offset)
116 return AVERROR_INVALIDDATA;
117
118 if (header_size == 0)
119 start_offset = 0x800;
120
121 coef[0] = avio_rl32(s->pb);
122 coef[1] = avio_rl32(s->pb);
123 c->dsp_int_type = avio_rl32(s->pb);
124 coef_type = avio_rl32(s->pb);
125 coef_splitted[0] = avio_rl32(s->pb);
126 coef_splitted[1] = avio_rl32(s->pb);
127
128 if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
129 if (st->codecpar->ch_layout.nb_channels > 2) {
130 avpriv_request_sample(s, "channels %d>2", st->codecpar->ch_layout.nb_channels);
131 return AVERROR_PATCHWELCOME;
132 }
133
134 ff_alloc_extradata(st->codecpar, 32 * st->codecpar->ch_layout.nb_channels);
135 for (ch = 0; ch < st->codecpar->ch_layout.nb_channels; ch++) {
136 if (coef_type & 1) {
137 avpriv_request_sample(s, "coef_type & 1");
138 return AVERROR_PATCHWELCOME;
139 } else {
140 avio_seek(s->pb, coef[ch], SEEK_SET);
141 avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
142 }
143 }
144
145 if (c->dsp_int_type == 1) {
146 st->codecpar->block_align = 8 * st->codecpar->ch_layout.nb_channels;
147 if (c->interleave_size != 1 &&
148 c->interleave_size != 2 &&
149 c->interleave_size != 4)
150 return AVERROR_INVALIDDATA;
151 }
152 }
153
154 if (st->codecpar->block_align <= 0)
155 return AVERROR_INVALIDDATA;
156
157 avio_skip(s->pb, start_offset - avio_tell(s->pb));
158
159 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
160
161 return 0;
162 }
163
genh_read_packet(AVFormatContext * s,AVPacket * pkt)164 static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
165 {
166 AVCodecParameters *par = s->streams[0]->codecpar;
167 GENHDemuxContext *c = s->priv_data;
168 int ret;
169
170 if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
171 par->ch_layout.nb_channels > 1) {
172 int i, ch;
173
174 if (avio_feof(s->pb))
175 return AVERROR_EOF;
176 ret = av_new_packet(pkt, 8 * par->ch_layout.nb_channels);
177 if (ret < 0)
178 return ret;
179 for (i = 0; i < 8 / c->interleave_size; i++) {
180 for (ch = 0; ch < par->ch_layout.nb_channels; ch++) {
181 pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
182 pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
183 }
184 }
185 ret = 0;
186 } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
187 ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
188
189 } else {
190 ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align :
191 1024 * par->ch_layout.nb_channels);
192 }
193
194 pkt->stream_index = 0;
195 return ret;
196 }
197
198 const AVInputFormat ff_genh_demuxer = {
199 .name = "genh",
200 .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
201 .priv_data_size = sizeof(GENHDemuxContext),
202 .read_probe = genh_probe,
203 .read_header = genh_read_header,
204 .read_packet = genh_read_packet,
205 .extensions = "genh",
206 };
207