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path: root/libavformat/genh.c (plain)
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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
27typedef struct GENHDemuxContext {
28 unsigned dsp_int_type;
29 unsigned interleave_size;
30} GENHDemuxContext;
31
32static int genh_probe(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
42static 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: st->codecpar->codec_id = AV_CODEC_ID_SDX2_DPCM; break;
91 case 7: ret = ff_alloc_extradata(st->codecpar, 2);
92 if (ret < 0)
93 return ret;
94 AV_WL16(st->codecpar->extradata, 3);
95 st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_WS; break;
96 case 10: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_AICA; break;
97 case 12: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_THP; break;
98 case 13: st->codecpar->codec_id = AV_CODEC_ID_PCM_U8; break;
99 case 17: st->codecpar->codec_id = AV_CODEC_ID_ADPCM_IMA_QT; break;
100 default:
101 avpriv_request_sample(s, "codec %d", codec);
102 return AVERROR_PATCHWELCOME;
103 }
104
105 start_offset = avio_rl32(s->pb);
106 header_size = avio_rl32(s->pb);
107
108 if (header_size > start_offset)
109 return AVERROR_INVALIDDATA;
110
111 if (header_size == 0)
112 start_offset = 0x800;
113
114 coef[0] = avio_rl32(s->pb);
115 coef[1] = avio_rl32(s->pb);
116 c->dsp_int_type = avio_rl32(s->pb);
117 coef_type = avio_rl32(s->pb);
118 coef_splitted[0] = avio_rl32(s->pb);
119 coef_splitted[1] = avio_rl32(s->pb);
120
121 if (st->codecpar->codec_id == AV_CODEC_ID_ADPCM_THP) {
122 if (st->codecpar->channels > 2) {
123 avpriv_request_sample(s, "channels %d>2", st->codecpar->channels);
124 return AVERROR_PATCHWELCOME;
125 }
126
127 ff_alloc_extradata(st->codecpar, 32 * st->codecpar->channels);
128 for (ch = 0; ch < st->codecpar->channels; ch++) {
129 if (coef_type & 1) {
130 avpriv_request_sample(s, "coef_type & 1");
131 return AVERROR_PATCHWELCOME;
132 } else {
133 avio_seek(s->pb, coef[ch], SEEK_SET);
134 avio_read(s->pb, st->codecpar->extradata + 32 * ch, 32);
135 }
136 }
137
138 if (c->dsp_int_type == 1) {
139 st->codecpar->block_align = 8 * st->codecpar->channels;
140 if (c->interleave_size != 1 &&
141 c->interleave_size != 2 &&
142 c->interleave_size != 4)
143 return AVERROR_INVALIDDATA;
144 }
145 }
146
147 avio_skip(s->pb, start_offset - avio_tell(s->pb));
148
149 avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate);
150
151 return 0;
152}
153
154static int genh_read_packet(AVFormatContext *s, AVPacket *pkt)
155{
156 AVCodecParameters *par = s->streams[0]->codecpar;
157 GENHDemuxContext *c = s->priv_data;
158 int ret;
159
160 if (c->dsp_int_type == 1 && par->codec_id == AV_CODEC_ID_ADPCM_THP &&
161 par->channels > 1) {
162 int i, ch;
163
164 if (avio_feof(s->pb))
165 return AVERROR_EOF;
166 ret = av_new_packet(pkt, 8 * par->channels);
167 if (ret < 0)
168 return ret;
169 for (i = 0; i < 8 / c->interleave_size; i++) {
170 for (ch = 0; ch < par->channels; ch++) {
171 pkt->data[ch * 8 + i*c->interleave_size+0] = avio_r8(s->pb);
172 pkt->data[ch * 8 + i*c->interleave_size+1] = avio_r8(s->pb);
173 }
174 }
175 ret = 0;
176 } else if (par->codec_id == AV_CODEC_ID_SDX2_DPCM) {
177 ret = av_get_packet(s->pb, pkt, par->block_align * 1024);
178
179 } else {
180 ret = av_get_packet(s->pb, pkt, par->block_align ? par->block_align : 1024 * par->channels);
181 }
182
183 pkt->stream_index = 0;
184 return ret;
185}
186
187AVInputFormat ff_genh_demuxer = {
188 .name = "genh",
189 .long_name = NULL_IF_CONFIG_SMALL("GENeric Header"),
190 .priv_data_size = sizeof(GENHDemuxContext),
191 .read_probe = genh_probe,
192 .read_header = genh_read_header,
193 .read_packet = genh_read_packet,
194 .extensions = "genh",
195};
196
generated by cgit at 2024-05-17 05:01:05 (GMT)