Commit | Line | Data |
---|---|---|
2ba45a60 DM |
1 | /* |
2 | * CDXL demuxer | |
3 | * Copyright (c) 2011-2012 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 "libavutil/parseutils.h" | |
25 | #include "libavutil/opt.h" | |
26 | #include "avformat.h" | |
27 | #include "internal.h" | |
28 | ||
29 | #define CDXL_HEADER_SIZE 32 | |
30 | ||
31 | typedef struct CDXLDemuxContext { | |
32 | AVClass *class; | |
33 | int sample_rate; | |
34 | char *framerate; | |
35 | AVRational fps; | |
36 | int read_chunk; | |
37 | uint8_t header[CDXL_HEADER_SIZE]; | |
38 | int video_stream_index; | |
39 | int audio_stream_index; | |
40 | } CDXLDemuxContext; | |
41 | ||
42 | static int cdxl_read_probe(AVProbeData *p) | |
43 | { | |
44 | int score = AVPROBE_SCORE_EXTENSION + 10; | |
45 | ||
46 | if (p->buf_size < CDXL_HEADER_SIZE) | |
47 | return 0; | |
48 | ||
49 | /* reserved bytes should always be set to 0 */ | |
50 | if (AV_RN64(&p->buf[24]) || AV_RN16(&p->buf[10])) | |
51 | return 0; | |
52 | ||
53 | /* check type */ | |
54 | if (p->buf[0] != 1) | |
55 | return 0; | |
56 | ||
57 | /* check palette size */ | |
58 | if (AV_RB16(&p->buf[20]) > 512) | |
59 | return 0; | |
60 | ||
61 | /* check number of planes */ | |
62 | if (p->buf[18] || !p->buf[19]) | |
63 | return 0; | |
64 | ||
65 | /* check widh and height */ | |
66 | if (!AV_RN16(&p->buf[14]) || !AV_RN16(&p->buf[16])) | |
67 | return 0; | |
68 | ||
69 | /* chunk size */ | |
70 | if (AV_RB32(&p->buf[2]) < AV_RB16(&p->buf[22]) + AV_RB16(&p->buf[20]) + CDXL_HEADER_SIZE) | |
71 | return 0; | |
72 | ||
73 | /* previous chunk size */ | |
74 | if (AV_RN32(&p->buf[6])) | |
75 | score /= 2; | |
76 | ||
77 | /* current frame number, usually starts from 1 */ | |
78 | if (AV_RB16(&p->buf[12]) != 1) | |
79 | score /= 2; | |
80 | ||
81 | return score; | |
82 | } | |
83 | ||
84 | static int cdxl_read_header(AVFormatContext *s) | |
85 | { | |
86 | CDXLDemuxContext *cdxl = s->priv_data; | |
87 | int ret; | |
88 | ||
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); | |
92 | return ret; | |
93 | } | |
94 | ||
95 | cdxl->read_chunk = 0; | |
96 | cdxl->video_stream_index = -1; | |
97 | cdxl->audio_stream_index = -1; | |
98 | ||
99 | s->ctx_flags |= AVFMTCTX_NOHEADER; | |
100 | ||
101 | return 0; | |
102 | } | |
103 | ||
104 | static int cdxl_read_packet(AVFormatContext *s, AVPacket *pkt) | |
105 | { | |
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; | |
110 | int64_t pos; | |
111 | int ret; | |
112 | ||
113 | if (avio_feof(pb)) | |
114 | return AVERROR_EOF; | |
115 | ||
116 | pos = avio_tell(pb); | |
117 | if (!cdxl->read_chunk && | |
118 | avio_read(pb, cdxl->header, CDXL_HEADER_SIZE) != CDXL_HEADER_SIZE) | |
119 | return AVERROR_EOF; | |
120 | if (cdxl->header[0] != 1) { | |
121 | av_log(s, AV_LOG_ERROR, "non-standard cdxl file\n"); | |
122 | return AVERROR_INVALIDDATA; | |
123 | } | |
124 | ||
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; | |
132 | ||
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; | |
137 | ||
138 | if (cdxl->read_chunk && audio_size) { | |
139 | if (cdxl->audio_stream_index == -1) { | |
140 | AVStream *st = avformat_new_stream(s, NULL); | |
141 | if (!st) | |
142 | return AVERROR(ENOMEM); | |
143 | ||
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; | |
150 | } else { | |
151 | st->codec->channels = 1; | |
152 | st->codec->channel_layout = AV_CH_LAYOUT_MONO; | |
153 | } | |
154 | st->codec->sample_rate = cdxl->sample_rate; | |
155 | st->start_time = 0; | |
156 | cdxl->audio_stream_index = st->index; | |
157 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); | |
158 | } | |
159 | ||
160 | ret = av_get_packet(pb, pkt, audio_size); | |
161 | if (ret < 0) | |
162 | return ret; | |
163 | pkt->stream_index = cdxl->audio_stream_index; | |
164 | pkt->pos = pos; | |
165 | pkt->duration = audio_size; | |
166 | cdxl->read_chunk = 0; | |
167 | } else { | |
168 | if (cdxl->video_stream_index == -1) { | |
169 | AVStream *st = avformat_new_stream(s, NULL); | |
170 | if (!st) | |
171 | return AVERROR(ENOMEM); | |
172 | ||
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; | |
178 | st->start_time = 0; | |
179 | cdxl->video_stream_index = st->index; | |
180 | if (cdxl->framerate) | |
181 | avpriv_set_pts_info(st, 64, cdxl->fps.den, cdxl->fps.num); | |
182 | else | |
183 | avpriv_set_pts_info(st, 64, 1, cdxl->sample_rate); | |
184 | } | |
185 | ||
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); | |
190 | if (ret < 0) { | |
191 | av_free_packet(pkt); | |
192 | return ret; | |
193 | } | |
194 | av_shrink_packet(pkt, CDXL_HEADER_SIZE + ret); | |
195 | pkt->stream_index = cdxl->video_stream_index; | |
196 | pkt->flags |= AV_PKT_FLAG_KEY; | |
197 | pkt->pos = pos; | |
198 | pkt->duration = cdxl->framerate ? 1 : audio_size ? audio_size : 220; | |
199 | cdxl->read_chunk = audio_size; | |
200 | } | |
201 | ||
202 | if (!cdxl->read_chunk) | |
203 | avio_skip(pb, current_size - audio_size - video_size - CDXL_HEADER_SIZE); | |
204 | return ret; | |
205 | } | |
206 | ||
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 }, | |
211 | { NULL }, | |
212 | }; | |
213 | ||
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, | |
219 | }; | |
220 | ||
221 | AVInputFormat ff_cdxl_demuxer = { | |
222 | .name = "cdxl", | |
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, | |
231 | }; |