3 * Copyright (c) 2011-2012 Paul B Mahol
5 * This file is part of FFmpeg.
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.
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.
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
22 #include "libavutil/channel_layout.h"
23 #include "libavutil/intreadwrite.h"
24 #include "libavutil/parseutils.h"
25 #include "libavutil/opt.h"
29 #define CDXL_HEADER_SIZE 32
31 typedef struct CDXLDemuxContext
{
37 uint8_t header
[CDXL_HEADER_SIZE
];
38 int video_stream_index
;
39 int audio_stream_index
;
42 static int cdxl_read_probe(AVProbeData
*p
)
44 int score
= AVPROBE_SCORE_EXTENSION
+ 10;
46 if (p
->buf_size
< CDXL_HEADER_SIZE
)
49 /* reserved bytes should always be set to 0 */
50 if (AV_RN64(&p
->buf
[24]) || AV_RN16(&p
->buf
[10]))
57 /* check palette size */
58 if (AV_RB16(&p
->buf
[20]) > 512)
61 /* check number of planes */
62 if (p
->buf
[18] || !p
->buf
[19])
65 /* check widh and height */
66 if (!AV_RN16(&p
->buf
[14]) || !AV_RN16(&p
->buf
[16]))
70 if (AV_RB32(&p
->buf
[2]) < AV_RB16(&p
->buf
[22]) + AV_RB16(&p
->buf
[20]) + CDXL_HEADER_SIZE
)
73 /* previous chunk size */
74 if (AV_RN32(&p
->buf
[6]))
77 /* current frame number, usually starts from 1 */
78 if (AV_RB16(&p
->buf
[12]) != 1)
84 static int cdxl_read_header(AVFormatContext
*s
)
86 CDXLDemuxContext
*cdxl
= s
->priv_data
;
89 if (cdxl
->framerate
&& (ret
= av_parse_video_rate(&cdxl
->fps
, cdxl
->framerate
)) < 0) {
90 av_log(s
, AV_LOG_ERROR
,
91 "Could not parse framerate: %s.\n", cdxl
->framerate
);
96 cdxl
->video_stream_index
= -1;
97 cdxl
->audio_stream_index
= -1;
99 s
->ctx_flags
|= AVFMTCTX_NOHEADER
;
104 static int cdxl_read_packet(AVFormatContext
*s
, AVPacket
*pkt
)
106 CDXLDemuxContext
*cdxl
= s
->priv_data
;
107 AVIOContext
*pb
= s
->pb
;
108 uint32_t current_size
, video_size
, image_size
;
109 uint16_t audio_size
, palette_size
, width
, height
;
117 if (!cdxl
->read_chunk
&&
118 avio_read(pb
, cdxl
->header
, CDXL_HEADER_SIZE
) != CDXL_HEADER_SIZE
)
120 if (cdxl
->header
[0] != 1) {
121 av_log(s
, AV_LOG_ERROR
, "non-standard cdxl file\n");
122 return AVERROR_INVALIDDATA
;
125 current_size
= AV_RB32(&cdxl
->header
[2]);
126 width
= AV_RB16(&cdxl
->header
[14]);
127 height
= AV_RB16(&cdxl
->header
[16]);
128 palette_size
= AV_RB16(&cdxl
->header
[20]);
129 audio_size
= AV_RB16(&cdxl
->header
[22]);
130 image_size
= FFALIGN(width
, 16) * height
* cdxl
->header
[19] / 8;
131 video_size
= palette_size
+ image_size
;
133 if (palette_size
> 512)
134 return AVERROR_INVALIDDATA
;
135 if (current_size
< (uint64_t)audio_size
+ video_size
+ CDXL_HEADER_SIZE
)
136 return AVERROR_INVALIDDATA
;
138 if (cdxl
->read_chunk
&& audio_size
) {
139 if (cdxl
->audio_stream_index
== -1) {
140 AVStream
*st
= avformat_new_stream(s
, NULL
);
142 return AVERROR(ENOMEM
);
144 st
->codec
->codec_type
= AVMEDIA_TYPE_AUDIO
;
145 st
->codec
->codec_tag
= 0;
146 st
->codec
->codec_id
= AV_CODEC_ID_PCM_S8
;
147 if (cdxl
->header
[1] & 0x10) {
148 st
->codec
->channels
= 2;
149 st
->codec
->channel_layout
= AV_CH_LAYOUT_STEREO
;
151 st
->codec
->channels
= 1;
152 st
->codec
->channel_layout
= AV_CH_LAYOUT_MONO
;
154 st
->codec
->sample_rate
= cdxl
->sample_rate
;
156 cdxl
->audio_stream_index
= st
->index
;
157 avpriv_set_pts_info(st
, 64, 1, cdxl
->sample_rate
);
160 ret
= av_get_packet(pb
, pkt
, audio_size
);
163 pkt
->stream_index
= cdxl
->audio_stream_index
;
165 pkt
->duration
= audio_size
;
166 cdxl
->read_chunk
= 0;
168 if (cdxl
->video_stream_index
== -1) {
169 AVStream
*st
= avformat_new_stream(s
, NULL
);
171 return AVERROR(ENOMEM
);
173 st
->codec
->codec_type
= AVMEDIA_TYPE_VIDEO
;
174 st
->codec
->codec_tag
= 0;
175 st
->codec
->codec_id
= AV_CODEC_ID_CDXL
;
176 st
->codec
->width
= width
;
177 st
->codec
->height
= height
;
179 cdxl
->video_stream_index
= st
->index
;
181 avpriv_set_pts_info(st
, 64, cdxl
->fps
.den
, cdxl
->fps
.num
);
183 avpriv_set_pts_info(st
, 64, 1, cdxl
->sample_rate
);
186 if (av_new_packet(pkt
, video_size
+ CDXL_HEADER_SIZE
) < 0)
187 return AVERROR(ENOMEM
);
188 memcpy(pkt
->data
, cdxl
->header
, CDXL_HEADER_SIZE
);
189 ret
= avio_read(pb
, pkt
->data
+ CDXL_HEADER_SIZE
, video_size
);
194 av_shrink_packet(pkt
, CDXL_HEADER_SIZE
+ ret
);
195 pkt
->stream_index
= cdxl
->video_stream_index
;
196 pkt
->flags
|= AV_PKT_FLAG_KEY
;
198 pkt
->duration
= cdxl
->framerate
? 1 : audio_size
? audio_size
: 220;
199 cdxl
->read_chunk
= audio_size
;
202 if (!cdxl
->read_chunk
)
203 avio_skip(pb
, current_size
- audio_size
- video_size
- CDXL_HEADER_SIZE
);
207 #define OFFSET(x) offsetof(CDXLDemuxContext, x)
208 static const AVOption cdxl_options
[] = {
209 { "sample_rate", "", OFFSET(sample_rate
), AV_OPT_TYPE_INT
, { .i64
= 11025 }, 1, INT_MAX
, AV_OPT_FLAG_DECODING_PARAM
},
210 { "framerate", "", OFFSET(framerate
), AV_OPT_TYPE_STRING
, { .str
= NULL
}, 0, 0, AV_OPT_FLAG_DECODING_PARAM
},
214 static const AVClass cdxl_demuxer_class
= {
215 .class_name
= "CDXL demuxer",
216 .item_name
= av_default_item_name
,
217 .option
= cdxl_options
,
218 .version
= LIBAVUTIL_VERSION_INT
,
221 AVInputFormat ff_cdxl_demuxer
= {
223 .long_name
= NULL_IF_CONFIG_SMALL("Commodore CDXL video"),
224 .priv_data_size
= sizeof(CDXLDemuxContext
),
225 .read_probe
= cdxl_read_probe
,
226 .read_header
= cdxl_read_header
,
227 .read_packet
= cdxl_read_packet
,
228 .extensions
= "cdxl,xl",
229 .flags
= AVFMT_GENERIC_INDEX
,
230 .priv_class
= &cdxl_demuxer_class
,