blob: 9b3eb6a6505db820c7fdd5ba29947dfdf894b5e5
1 | /* |
2 | * LXF demuxer |
3 | * Copyright (c) 2010 Tomas Härdin |
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 <inttypes.h> |
23 | |
24 | #include "libavutil/intreadwrite.h" |
25 | #include "libavcodec/bytestream.h" |
26 | #include "avformat.h" |
27 | #include "internal.h" |
28 | |
29 | #define LXF_MAX_PACKET_HEADER_SIZE 256 |
30 | #define LXF_HEADER_DATA_SIZE 120 |
31 | #define LXF_IDENT "LEITCH\0" |
32 | #define LXF_IDENT_LENGTH 8 |
33 | #define LXF_SAMPLERATE 48000 |
34 | |
35 | static const AVCodecTag lxf_tags[] = { |
36 | { AV_CODEC_ID_MJPEG, 0 }, |
37 | { AV_CODEC_ID_MPEG1VIDEO, 1 }, |
38 | { AV_CODEC_ID_MPEG2VIDEO, 2 }, //MpMl, 4:2:0 |
39 | { AV_CODEC_ID_MPEG2VIDEO, 3 }, //MpPl, 4:2:2 |
40 | { AV_CODEC_ID_DVVIDEO, 4 }, //DV25 |
41 | { AV_CODEC_ID_DVVIDEO, 5 }, //DVCPRO |
42 | { AV_CODEC_ID_DVVIDEO, 6 }, //DVCPRO50 |
43 | { AV_CODEC_ID_RAWVIDEO, 7 }, //AV_PIX_FMT_ARGB, where alpha is used for chroma keying |
44 | { AV_CODEC_ID_RAWVIDEO, 8 }, //16-bit chroma key |
45 | { AV_CODEC_ID_MPEG2VIDEO, 9 }, //4:2:2 CBP ("Constrained Bytes per Gop") |
46 | { AV_CODEC_ID_NONE, 0 }, |
47 | }; |
48 | |
49 | typedef struct LXFDemuxContext { |
50 | int channels; ///< number of audio channels. zero means no audio |
51 | int frame_number; ///< current video frame |
52 | uint32_t video_format, packet_type, extended_size; |
53 | } LXFDemuxContext; |
54 | |
55 | static int lxf_probe(AVProbeData *p) |
56 | { |
57 | if (!memcmp(p->buf, LXF_IDENT, LXF_IDENT_LENGTH)) |
58 | return AVPROBE_SCORE_MAX; |
59 | |
60 | return 0; |
61 | } |
62 | |
63 | /** |
64 | * Verify the checksum of an LXF packet header |
65 | * |
66 | * @param[in] header the packet header to check |
67 | * @return zero if the checksum is OK, non-zero otherwise |
68 | */ |
69 | static int check_checksum(const uint8_t *header, int size) |
70 | { |
71 | int x; |
72 | uint32_t sum = 0; |
73 | |
74 | for (x = 0; x < size; x += 4) |
75 | sum += AV_RL32(&header[x]); |
76 | |
77 | return sum; |
78 | } |
79 | |
80 | /** |
81 | * Read input until we find the next ident. If found, copy it to the header buffer |
82 | * |
83 | * @param[out] header where to copy the ident to |
84 | * @return 0 if an ident was found, < 0 on I/O error |
85 | */ |
86 | static int lxf_sync(AVFormatContext *s, uint8_t *header) |
87 | { |
88 | uint8_t buf[LXF_IDENT_LENGTH]; |
89 | int ret; |
90 | |
91 | if ((ret = avio_read(s->pb, buf, LXF_IDENT_LENGTH)) != LXF_IDENT_LENGTH) |
92 | return ret < 0 ? ret : AVERROR_EOF; |
93 | |
94 | while (memcmp(buf, LXF_IDENT, LXF_IDENT_LENGTH)) { |
95 | if (avio_feof(s->pb)) |
96 | return AVERROR_EOF; |
97 | |
98 | memmove(buf, &buf[1], LXF_IDENT_LENGTH-1); |
99 | buf[LXF_IDENT_LENGTH-1] = avio_r8(s->pb); |
100 | } |
101 | |
102 | memcpy(header, LXF_IDENT, LXF_IDENT_LENGTH); |
103 | |
104 | return 0; |
105 | } |
106 | |
107 | /** |
108 | * Read and checksum the next packet header |
109 | * |
110 | * @return the size of the payload following the header or < 0 on failure |
111 | */ |
112 | static int get_packet_header(AVFormatContext *s) |
113 | { |
114 | LXFDemuxContext *lxf = s->priv_data; |
115 | AVIOContext *pb = s->pb; |
116 | int track_size, samples, ret; |
117 | uint32_t version, audio_format, header_size, channels, tmp; |
118 | AVStream *st; |
119 | uint8_t header[LXF_MAX_PACKET_HEADER_SIZE]; |
120 | const uint8_t *p = header + LXF_IDENT_LENGTH; |
121 | |
122 | //find and read the ident |
123 | if ((ret = lxf_sync(s, header)) < 0) |
124 | return ret; |
125 | |
126 | ret = avio_read(pb, header + LXF_IDENT_LENGTH, 8); |
127 | if (ret != 8) |
128 | return ret < 0 ? ret : AVERROR_EOF; |
129 | |
130 | version = bytestream_get_le32(&p); |
131 | header_size = bytestream_get_le32(&p); |
132 | if (version > 1) |
133 | avpriv_request_sample(s, "Format version %"PRIu32, version); |
134 | |
135 | if (header_size < (version ? 72 : 60) || |
136 | header_size > LXF_MAX_PACKET_HEADER_SIZE || |
137 | (header_size & 3)) { |
138 | av_log(s, AV_LOG_ERROR, "Invalid header size 0x%"PRIx32"\n", header_size); |
139 | return AVERROR_INVALIDDATA; |
140 | } |
141 | |
142 | //read the rest of the packet header |
143 | if ((ret = avio_read(pb, header + (p - header), |
144 | header_size - (p - header))) != |
145 | header_size - (p - header)) |
146 | return ret < 0 ? ret : AVERROR_EOF; |
147 | |
148 | if (check_checksum(header, header_size)) |
149 | av_log(s, AV_LOG_ERROR, "checksum error\n"); |
150 | |
151 | lxf->packet_type = bytestream_get_le32(&p); |
152 | p += version ? 20 : 12; |
153 | |
154 | lxf->extended_size = 0; |
155 | switch (lxf->packet_type) { |
156 | case 0: |
157 | //video |
158 | lxf->video_format = bytestream_get_le32(&p); |
159 | ret = bytestream_get_le32(&p); |
160 | //skip VBI data and metadata |
161 | avio_skip(pb, (int64_t)(uint32_t)AV_RL32(p + 4) + |
162 | (int64_t)(uint32_t)AV_RL32(p + 12)); |
163 | break; |
164 | case 1: |
165 | //audio |
166 | if (s->nb_streams < 2) { |
167 | av_log(s, AV_LOG_INFO, "got audio packet, but no audio stream present\n"); |
168 | break; |
169 | } |
170 | |
171 | if (version == 0) |
172 | p += 8; |
173 | audio_format = bytestream_get_le32(&p); |
174 | channels = bytestream_get_le32(&p); |
175 | track_size = bytestream_get_le32(&p); |
176 | |
177 | st = s->streams[1]; |
178 | |
179 | //set codec based on specified audio bitdepth |
180 | //we only support tightly packed 16-, 20-, 24- and 32-bit PCM at the moment |
181 | st->codecpar->bits_per_coded_sample = (audio_format >> 6) & 0x3F; |
182 | |
183 | if (st->codecpar->bits_per_coded_sample != (audio_format & 0x3F)) { |
184 | avpriv_report_missing_feature(s, "Not tightly packed PCM"); |
185 | return AVERROR_PATCHWELCOME; |
186 | } |
187 | |
188 | switch (st->codecpar->bits_per_coded_sample) { |
189 | case 16: st->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break; |
190 | case 20: st->codecpar->codec_id = AV_CODEC_ID_PCM_LXF; break; |
191 | case 24: st->codecpar->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break; |
192 | case 32: st->codecpar->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break; |
193 | default: |
194 | avpriv_report_missing_feature(s, "PCM not 16-, 20-, 24- or 32-bits"); |
195 | return AVERROR_PATCHWELCOME; |
196 | } |
197 | |
198 | samples = track_size * 8 / st->codecpar->bits_per_coded_sample; |
199 | |
200 | //use audio packet size to determine video standard |
201 | //for NTSC we have one 8008-sample audio frame per five video frames |
202 | if (samples == LXF_SAMPLERATE * 5005 / 30000) { |
203 | avpriv_set_pts_info(s->streams[0], 64, 1001, 30000); |
204 | } else { |
205 | //assume PAL, but warn if we don't have 1920 samples |
206 | if (samples != LXF_SAMPLERATE / 25) |
207 | av_log(s, AV_LOG_WARNING, |
208 | "video doesn't seem to be PAL or NTSC. guessing PAL\n"); |
209 | |
210 | avpriv_set_pts_info(s->streams[0], 64, 1, 25); |
211 | } |
212 | |
213 | //TODO: warning if track mask != (1 << channels) - 1? |
214 | ret = av_popcount(channels) * track_size; |
215 | |
216 | break; |
217 | default: |
218 | tmp = bytestream_get_le32(&p); |
219 | ret = bytestream_get_le32(&p); |
220 | if (tmp == 1) |
221 | lxf->extended_size = bytestream_get_le32(&p); |
222 | break; |
223 | } |
224 | |
225 | return ret; |
226 | } |
227 | |
228 | static int lxf_read_header(AVFormatContext *s) |
229 | { |
230 | LXFDemuxContext *lxf = s->priv_data; |
231 | AVIOContext *pb = s->pb; |
232 | uint8_t header_data[LXF_HEADER_DATA_SIZE]; |
233 | int ret; |
234 | AVStream *st; |
235 | uint32_t video_params, disk_params; |
236 | uint16_t record_date, expiration_date; |
237 | |
238 | if ((ret = get_packet_header(s)) < 0) |
239 | return ret; |
240 | |
241 | if (ret != LXF_HEADER_DATA_SIZE) { |
242 | av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n", |
243 | LXF_HEADER_DATA_SIZE, ret); |
244 | return AVERROR_INVALIDDATA; |
245 | } |
246 | |
247 | if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE) |
248 | return ret < 0 ? ret : AVERROR_EOF; |
249 | |
250 | if (!(st = avformat_new_stream(s, NULL))) |
251 | return AVERROR(ENOMEM); |
252 | |
253 | st->duration = AV_RL32(&header_data[32]); |
254 | video_params = AV_RL32(&header_data[40]); |
255 | record_date = AV_RL16(&header_data[56]); |
256 | expiration_date = AV_RL16(&header_data[58]); |
257 | disk_params = AV_RL32(&header_data[116]); |
258 | |
259 | st->codecpar->codec_type = AVMEDIA_TYPE_VIDEO; |
260 | st->codecpar->bit_rate = 1000000 * ((video_params >> 14) & 0xFF); |
261 | st->codecpar->codec_tag = video_params & 0xF; |
262 | st->codecpar->codec_id = ff_codec_get_id(lxf_tags, st->codecpar->codec_tag); |
263 | st->need_parsing = AVSTREAM_PARSE_HEADERS; |
264 | |
265 | av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n", |
266 | record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF, |
267 | (record_date >> 11) & 0x1F); |
268 | |
269 | av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n", |
270 | expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF, |
271 | (expiration_date >> 11) & 0x1F); |
272 | |
273 | if ((video_params >> 22) & 1) |
274 | av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n"); |
275 | |
276 | if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) { |
277 | if (!(st = avformat_new_stream(s, NULL))) |
278 | return AVERROR(ENOMEM); |
279 | |
280 | st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO; |
281 | st->codecpar->sample_rate = LXF_SAMPLERATE; |
282 | st->codecpar->channels = lxf->channels; |
283 | |
284 | avpriv_set_pts_info(st, 64, 1, st->codecpar->sample_rate); |
285 | } |
286 | |
287 | avio_skip(s->pb, lxf->extended_size); |
288 | |
289 | return 0; |
290 | } |
291 | |
292 | static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt) |
293 | { |
294 | LXFDemuxContext *lxf = s->priv_data; |
295 | AVIOContext *pb = s->pb; |
296 | uint32_t stream; |
297 | int ret, ret2; |
298 | |
299 | if ((ret = get_packet_header(s)) < 0) |
300 | return ret; |
301 | |
302 | stream = lxf->packet_type; |
303 | |
304 | if (stream > 1) { |
305 | av_log(s, AV_LOG_WARNING, |
306 | "got packet with illegal stream index %"PRIu32"\n", stream); |
307 | return FFERROR_REDO; |
308 | } |
309 | |
310 | if (stream == 1 && s->nb_streams < 2) { |
311 | av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n"); |
312 | return AVERROR_INVALIDDATA; |
313 | } |
314 | |
315 | if ((ret2 = av_new_packet(pkt, ret)) < 0) |
316 | return ret2; |
317 | |
318 | if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) { |
319 | av_packet_unref(pkt); |
320 | return ret2 < 0 ? ret2 : AVERROR_EOF; |
321 | } |
322 | |
323 | pkt->stream_index = stream; |
324 | |
325 | if (!stream) { |
326 | //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B) |
327 | if (((lxf->video_format >> 22) & 0x3) < 2) |
328 | pkt->flags |= AV_PKT_FLAG_KEY; |
329 | |
330 | pkt->dts = lxf->frame_number++; |
331 | } |
332 | |
333 | return ret; |
334 | } |
335 | |
336 | AVInputFormat ff_lxf_demuxer = { |
337 | .name = "lxf", |
338 | .long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"), |
339 | .priv_data_size = sizeof(LXFDemuxContext), |
340 | .read_probe = lxf_probe, |
341 | .read_header = lxf_read_header, |
342 | .read_packet = lxf_read_packet, |
343 | .codec_tag = (const AVCodecTag* const []){lxf_tags, 0}, |
344 | }; |
345 |