Commit | Line | Data |
---|---|---|
2ba45a60 DM |
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 { | |
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 | */ | |
f6fa7814 | 86 | static int lxf_sync(AVFormatContext *s, uint8_t *header) |
2ba45a60 DM |
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 | |
f6fa7814 | 123 | if ((ret = lxf_sync(s, header)) < 0) |
2ba45a60 DM |
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, "Unknown format version %"PRIu32"\n", 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->codec->bits_per_coded_sample = (audio_format >> 6) & 0x3F; | |
182 | ||
183 | if (st->codec->bits_per_coded_sample != (audio_format & 0x3F)) { | |
184 | av_log(s, AV_LOG_WARNING, "only tightly packed PCM currently supported\n"); | |
185 | return AVERROR_PATCHWELCOME; | |
186 | } | |
187 | ||
188 | switch (st->codec->bits_per_coded_sample) { | |
189 | case 16: st->codec->codec_id = AV_CODEC_ID_PCM_S16LE_PLANAR; break; | |
190 | case 20: st->codec->codec_id = AV_CODEC_ID_PCM_LXF; break; | |
191 | case 24: st->codec->codec_id = AV_CODEC_ID_PCM_S24LE_PLANAR; break; | |
192 | case 32: st->codec->codec_id = AV_CODEC_ID_PCM_S32LE_PLANAR; break; | |
193 | default: | |
194 | av_log(s, AV_LOG_WARNING, | |
195 | "only 16-, 20-, 24- and 32-bit PCM currently supported\n"); | |
196 | return AVERROR_PATCHWELCOME; | |
197 | } | |
198 | ||
199 | samples = track_size * 8 / st->codec->bits_per_coded_sample; | |
200 | ||
201 | //use audio packet size to determine video standard | |
202 | //for NTSC we have one 8008-sample audio frame per five video frames | |
203 | if (samples == LXF_SAMPLERATE * 5005 / 30000) { | |
204 | avpriv_set_pts_info(s->streams[0], 64, 1001, 30000); | |
205 | } else { | |
206 | //assume PAL, but warn if we don't have 1920 samples | |
207 | if (samples != LXF_SAMPLERATE / 25) | |
208 | av_log(s, AV_LOG_WARNING, | |
209 | "video doesn't seem to be PAL or NTSC. guessing PAL\n"); | |
210 | ||
211 | avpriv_set_pts_info(s->streams[0], 64, 1, 25); | |
212 | } | |
213 | ||
214 | //TODO: warning if track mask != (1 << channels) - 1? | |
215 | ret = av_popcount(channels) * track_size; | |
216 | ||
217 | break; | |
218 | default: | |
219 | tmp = bytestream_get_le32(&p); | |
220 | ret = bytestream_get_le32(&p); | |
221 | if (tmp == 1) | |
222 | lxf->extended_size = bytestream_get_le32(&p); | |
223 | break; | |
224 | } | |
225 | ||
226 | return ret; | |
227 | } | |
228 | ||
229 | static int lxf_read_header(AVFormatContext *s) | |
230 | { | |
231 | LXFDemuxContext *lxf = s->priv_data; | |
232 | AVIOContext *pb = s->pb; | |
233 | uint8_t header_data[LXF_HEADER_DATA_SIZE]; | |
234 | int ret; | |
235 | AVStream *st; | |
236 | uint32_t video_params, disk_params; | |
237 | uint16_t record_date, expiration_date; | |
238 | ||
239 | if ((ret = get_packet_header(s)) < 0) | |
240 | return ret; | |
241 | ||
242 | if (ret != LXF_HEADER_DATA_SIZE) { | |
243 | av_log(s, AV_LOG_ERROR, "expected %d B size header, got %d\n", | |
244 | LXF_HEADER_DATA_SIZE, ret); | |
245 | return AVERROR_INVALIDDATA; | |
246 | } | |
247 | ||
248 | if ((ret = avio_read(pb, header_data, LXF_HEADER_DATA_SIZE)) != LXF_HEADER_DATA_SIZE) | |
249 | return ret < 0 ? ret : AVERROR_EOF; | |
250 | ||
251 | if (!(st = avformat_new_stream(s, NULL))) | |
252 | return AVERROR(ENOMEM); | |
253 | ||
254 | st->duration = AV_RL32(&header_data[32]); | |
255 | video_params = AV_RL32(&header_data[40]); | |
256 | record_date = AV_RL16(&header_data[56]); | |
257 | expiration_date = AV_RL16(&header_data[58]); | |
258 | disk_params = AV_RL32(&header_data[116]); | |
259 | ||
260 | st->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
261 | st->codec->bit_rate = 1000000 * ((video_params >> 14) & 0xFF); | |
262 | st->codec->codec_tag = video_params & 0xF; | |
263 | st->codec->codec_id = ff_codec_get_id(lxf_tags, st->codec->codec_tag); | |
264 | st->need_parsing = AVSTREAM_PARSE_HEADERS; | |
265 | ||
266 | av_log(s, AV_LOG_DEBUG, "record: %x = %i-%02i-%02i\n", | |
267 | record_date, 1900 + (record_date & 0x7F), (record_date >> 7) & 0xF, | |
268 | (record_date >> 11) & 0x1F); | |
269 | ||
270 | av_log(s, AV_LOG_DEBUG, "expire: %x = %i-%02i-%02i\n", | |
271 | expiration_date, 1900 + (expiration_date & 0x7F), (expiration_date >> 7) & 0xF, | |
272 | (expiration_date >> 11) & 0x1F); | |
273 | ||
274 | if ((video_params >> 22) & 1) | |
275 | av_log(s, AV_LOG_WARNING, "VBI data not yet supported\n"); | |
276 | ||
277 | if ((lxf->channels = 1 << (disk_params >> 4 & 3) + 1)) { | |
278 | if (!(st = avformat_new_stream(s, NULL))) | |
279 | return AVERROR(ENOMEM); | |
280 | ||
281 | st->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
282 | st->codec->sample_rate = LXF_SAMPLERATE; | |
283 | st->codec->channels = lxf->channels; | |
284 | ||
285 | avpriv_set_pts_info(st, 64, 1, st->codec->sample_rate); | |
286 | } | |
287 | ||
288 | avio_skip(s->pb, lxf->extended_size); | |
289 | ||
290 | return 0; | |
291 | } | |
292 | ||
293 | static int lxf_read_packet(AVFormatContext *s, AVPacket *pkt) | |
294 | { | |
295 | LXFDemuxContext *lxf = s->priv_data; | |
296 | AVIOContext *pb = s->pb; | |
297 | uint32_t stream; | |
298 | int ret, ret2; | |
299 | ||
300 | if ((ret = get_packet_header(s)) < 0) | |
301 | return ret; | |
302 | ||
303 | stream = lxf->packet_type; | |
304 | ||
305 | if (stream > 1) { | |
306 | av_log(s, AV_LOG_WARNING, | |
307 | "got packet with illegal stream index %"PRIu32"\n", stream); | |
308 | return AVERROR(EAGAIN); | |
309 | } | |
310 | ||
311 | if (stream == 1 && s->nb_streams < 2) { | |
312 | av_log(s, AV_LOG_ERROR, "got audio packet without having an audio stream\n"); | |
313 | return AVERROR_INVALIDDATA; | |
314 | } | |
315 | ||
316 | if ((ret2 = av_new_packet(pkt, ret)) < 0) | |
317 | return ret2; | |
318 | ||
319 | if ((ret2 = avio_read(pb, pkt->data, ret)) != ret) { | |
320 | av_free_packet(pkt); | |
321 | return ret2 < 0 ? ret2 : AVERROR_EOF; | |
322 | } | |
323 | ||
324 | pkt->stream_index = stream; | |
325 | ||
326 | if (!stream) { | |
327 | //picture type (0 = closed I, 1 = open I, 2 = P, 3 = B) | |
328 | if (((lxf->video_format >> 22) & 0x3) < 2) | |
329 | pkt->flags |= AV_PKT_FLAG_KEY; | |
330 | ||
331 | pkt->dts = lxf->frame_number++; | |
332 | } | |
333 | ||
334 | return ret; | |
335 | } | |
336 | ||
337 | AVInputFormat ff_lxf_demuxer = { | |
338 | .name = "lxf", | |
339 | .long_name = NULL_IF_CONFIG_SMALL("VR native stream (LXF)"), | |
340 | .priv_data_size = sizeof(LXFDemuxContext), | |
341 | .read_probe = lxf_probe, | |
342 | .read_header = lxf_read_header, | |
343 | .read_packet = lxf_read_packet, | |
344 | .codec_tag = (const AVCodecTag* const []){lxf_tags, 0}, | |
345 | }; |