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2ba45a60 DM |
1 | /* |
2 | * NuppelVideo demuxer. | |
3 | * Copyright (c) 2006 Reimar Doeffinger | |
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/intfloat.h" | |
25 | #include "avformat.h" | |
26 | #include "internal.h" | |
27 | #include "riff.h" | |
28 | ||
29 | static const AVCodecTag nuv_audio_tags[] = { | |
30 | { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') }, | |
31 | { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') }, | |
32 | { AV_CODEC_ID_NONE, 0 }, | |
33 | }; | |
34 | ||
35 | typedef struct { | |
36 | int v_id; | |
37 | int a_id; | |
38 | int rtjpg_video; | |
39 | } NUVContext; | |
40 | ||
41 | typedef enum { | |
42 | NUV_VIDEO = 'V', | |
43 | NUV_EXTRADATA = 'D', | |
44 | NUV_AUDIO = 'A', | |
45 | NUV_SEEKP = 'R', | |
46 | NUV_MYTHEXT = 'X' | |
47 | } nuv_frametype; | |
48 | ||
49 | static int nuv_probe(AVProbeData *p) | |
50 | { | |
51 | if (!memcmp(p->buf, "NuppelVideo", 12)) | |
52 | return AVPROBE_SCORE_MAX; | |
53 | if (!memcmp(p->buf, "MythTVVideo", 12)) | |
54 | return AVPROBE_SCORE_MAX; | |
55 | return 0; | |
56 | } | |
57 | ||
58 | /// little macro to sanitize packet size | |
59 | #define PKTSIZE(s) (s & 0xffffff) | |
60 | ||
61 | /** | |
62 | * @brief read until we found all data needed for decoding | |
63 | * @param vst video stream of which to change parameters | |
64 | * @param ast video stream of which to change parameters | |
65 | * @param myth set if this is a MythTVVideo format file | |
66 | * @return 0 or AVERROR code | |
67 | */ | |
68 | static int get_codec_data(AVIOContext *pb, AVStream *vst, | |
69 | AVStream *ast, int myth) | |
70 | { | |
71 | nuv_frametype frametype; | |
72 | ||
73 | if (!vst && !myth) | |
74 | return 1; // no codec data needed | |
75 | while (!avio_feof(pb)) { | |
76 | int size, subtype; | |
77 | ||
78 | frametype = avio_r8(pb); | |
79 | switch (frametype) { | |
80 | case NUV_EXTRADATA: | |
81 | subtype = avio_r8(pb); | |
82 | avio_skip(pb, 6); | |
83 | size = PKTSIZE(avio_rl32(pb)); | |
84 | if (vst && subtype == 'R') { | |
85 | if (vst->codec->extradata) { | |
86 | av_freep(&vst->codec->extradata); | |
87 | vst->codec->extradata_size = 0; | |
88 | } | |
89 | if (ff_get_extradata(vst->codec, pb, size) < 0) | |
90 | return AVERROR(ENOMEM); | |
91 | size = 0; | |
92 | if (!myth) | |
93 | return 0; | |
94 | } | |
95 | break; | |
96 | case NUV_MYTHEXT: | |
97 | avio_skip(pb, 7); | |
98 | size = PKTSIZE(avio_rl32(pb)); | |
99 | if (size != 128 * 4) | |
100 | break; | |
101 | avio_rl32(pb); // version | |
102 | if (vst) { | |
103 | vst->codec->codec_tag = avio_rl32(pb); | |
104 | vst->codec->codec_id = | |
105 | ff_codec_get_id(ff_codec_bmp_tags, vst->codec->codec_tag); | |
106 | if (vst->codec->codec_tag == MKTAG('R', 'J', 'P', 'G')) | |
107 | vst->codec->codec_id = AV_CODEC_ID_NUV; | |
108 | } else | |
109 | avio_skip(pb, 4); | |
110 | ||
111 | if (ast) { | |
112 | int id; | |
113 | ||
114 | ast->codec->codec_tag = avio_rl32(pb); | |
115 | ast->codec->sample_rate = avio_rl32(pb); | |
116 | ast->codec->bits_per_coded_sample = avio_rl32(pb); | |
117 | ast->codec->channels = avio_rl32(pb); | |
118 | ast->codec->channel_layout = 0; | |
119 | ||
120 | id = ff_wav_codec_get_id(ast->codec->codec_tag, | |
121 | ast->codec->bits_per_coded_sample); | |
122 | if (id == AV_CODEC_ID_NONE) { | |
123 | id = ff_codec_get_id(nuv_audio_tags, ast->codec->codec_tag); | |
124 | if (id == AV_CODEC_ID_PCM_S16LE) | |
125 | id = ff_get_pcm_codec_id(ast->codec->bits_per_coded_sample, | |
126 | 0, 0, ~1); | |
127 | } | |
128 | ast->codec->codec_id = id; | |
129 | ||
130 | ast->need_parsing = AVSTREAM_PARSE_FULL; | |
131 | } else | |
132 | avio_skip(pb, 4 * 4); | |
133 | ||
134 | size -= 6 * 4; | |
135 | avio_skip(pb, size); | |
136 | return 0; | |
137 | case NUV_SEEKP: | |
138 | size = 11; | |
139 | break; | |
140 | default: | |
141 | avio_skip(pb, 7); | |
142 | size = PKTSIZE(avio_rl32(pb)); | |
143 | break; | |
144 | } | |
145 | avio_skip(pb, size); | |
146 | } | |
147 | ||
148 | return 0; | |
149 | } | |
150 | ||
151 | static int nuv_header(AVFormatContext *s) | |
152 | { | |
153 | NUVContext *ctx = s->priv_data; | |
154 | AVIOContext *pb = s->pb; | |
155 | char id_string[12]; | |
156 | double aspect, fps; | |
157 | int is_mythtv, width, height, v_packs, a_packs, ret; | |
158 | AVStream *vst = NULL, *ast = NULL; | |
159 | ||
160 | avio_read(pb, id_string, 12); | |
161 | is_mythtv = !memcmp(id_string, "MythTVVideo", 12); | |
162 | avio_skip(pb, 5); // version string | |
163 | avio_skip(pb, 3); // padding | |
164 | width = avio_rl32(pb); | |
165 | height = avio_rl32(pb); | |
166 | avio_rl32(pb); // unused, "desiredwidth" | |
167 | avio_rl32(pb); // unused, "desiredheight" | |
168 | avio_r8(pb); // 'P' == progressive, 'I' == interlaced | |
169 | avio_skip(pb, 3); // padding | |
170 | aspect = av_int2double(avio_rl64(pb)); | |
171 | if (aspect > 0.9999 && aspect < 1.0001) | |
172 | aspect = 4.0 / 3.0; | |
173 | fps = av_int2double(avio_rl64(pb)); | |
174 | ||
175 | // number of packets per stream type, -1 means unknown, e.g. streaming | |
176 | v_packs = avio_rl32(pb); | |
177 | a_packs = avio_rl32(pb); | |
178 | avio_rl32(pb); // text | |
179 | ||
180 | avio_rl32(pb); // keyframe distance (?) | |
181 | ||
182 | if (v_packs) { | |
183 | vst = avformat_new_stream(s, NULL); | |
184 | if (!vst) | |
185 | return AVERROR(ENOMEM); | |
186 | ctx->v_id = vst->index; | |
187 | ||
188 | vst->codec->codec_type = AVMEDIA_TYPE_VIDEO; | |
189 | vst->codec->codec_id = AV_CODEC_ID_NUV; | |
190 | vst->codec->width = width; | |
191 | vst->codec->height = height; | |
192 | vst->codec->bits_per_coded_sample = 10; | |
193 | vst->sample_aspect_ratio = av_d2q(aspect * height / width, | |
194 | 10000); | |
195 | #if FF_API_R_FRAME_RATE | |
196 | vst->r_frame_rate = | |
197 | #endif | |
198 | vst->avg_frame_rate = av_d2q(fps, 60000); | |
199 | avpriv_set_pts_info(vst, 32, 1, 1000); | |
200 | } else | |
201 | ctx->v_id = -1; | |
202 | ||
203 | if (a_packs) { | |
204 | ast = avformat_new_stream(s, NULL); | |
205 | if (!ast) | |
206 | return AVERROR(ENOMEM); | |
207 | ctx->a_id = ast->index; | |
208 | ||
209 | ast->codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
210 | ast->codec->codec_id = AV_CODEC_ID_PCM_S16LE; | |
211 | ast->codec->channels = 2; | |
212 | ast->codec->channel_layout = AV_CH_LAYOUT_STEREO; | |
213 | ast->codec->sample_rate = 44100; | |
214 | ast->codec->bit_rate = 2 * 2 * 44100 * 8; | |
215 | ast->codec->block_align = 2 * 2; | |
216 | ast->codec->bits_per_coded_sample = 16; | |
217 | avpriv_set_pts_info(ast, 32, 1, 1000); | |
218 | } else | |
219 | ctx->a_id = -1; | |
220 | ||
221 | if ((ret = get_codec_data(pb, vst, ast, is_mythtv)) < 0) | |
222 | return ret; | |
223 | ||
224 | ctx->rtjpg_video = vst && vst->codec->codec_id == AV_CODEC_ID_NUV; | |
225 | ||
226 | return 0; | |
227 | } | |
228 | ||
229 | #define HDRSIZE 12 | |
230 | ||
231 | static int nuv_packet(AVFormatContext *s, AVPacket *pkt) | |
232 | { | |
233 | NUVContext *ctx = s->priv_data; | |
234 | AVIOContext *pb = s->pb; | |
235 | uint8_t hdr[HDRSIZE]; | |
236 | nuv_frametype frametype; | |
237 | int ret, size; | |
238 | ||
239 | while (!avio_feof(pb)) { | |
240 | int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0; | |
241 | uint64_t pos = avio_tell(pb); | |
242 | ||
243 | ret = avio_read(pb, hdr, HDRSIZE); | |
244 | if (ret < HDRSIZE) | |
245 | return ret < 0 ? ret : AVERROR(EIO); | |
246 | ||
247 | frametype = hdr[0]; | |
248 | size = PKTSIZE(AV_RL32(&hdr[8])); | |
249 | ||
250 | switch (frametype) { | |
251 | case NUV_EXTRADATA: | |
252 | if (!ctx->rtjpg_video) { | |
253 | avio_skip(pb, size); | |
254 | break; | |
255 | } | |
256 | case NUV_VIDEO: | |
257 | if (ctx->v_id < 0) { | |
258 | av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n"); | |
259 | avio_skip(pb, size); | |
260 | break; | |
261 | } | |
262 | ret = av_new_packet(pkt, copyhdrsize + size); | |
263 | if (ret < 0) | |
264 | return ret; | |
265 | ||
266 | pkt->pos = pos; | |
267 | pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0; | |
268 | pkt->pts = AV_RL32(&hdr[4]); | |
269 | pkt->stream_index = ctx->v_id; | |
270 | memcpy(pkt->data, hdr, copyhdrsize); | |
271 | ret = avio_read(pb, pkt->data + copyhdrsize, size); | |
272 | if (ret < 0) { | |
273 | av_free_packet(pkt); | |
274 | return ret; | |
275 | } | |
276 | if (ret < size) | |
277 | av_shrink_packet(pkt, copyhdrsize + ret); | |
278 | return 0; | |
279 | case NUV_AUDIO: | |
280 | if (ctx->a_id < 0) { | |
281 | av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n"); | |
282 | avio_skip(pb, size); | |
283 | break; | |
284 | } | |
285 | ret = av_get_packet(pb, pkt, size); | |
286 | pkt->flags |= AV_PKT_FLAG_KEY; | |
287 | pkt->pos = pos; | |
288 | pkt->pts = AV_RL32(&hdr[4]); | |
289 | pkt->stream_index = ctx->a_id; | |
290 | if (ret < 0) | |
291 | return ret; | |
292 | return 0; | |
293 | case NUV_SEEKP: | |
294 | // contains no data, size value is invalid | |
295 | break; | |
296 | default: | |
297 | avio_skip(pb, size); | |
298 | break; | |
299 | } | |
300 | } | |
301 | ||
302 | return AVERROR(EIO); | |
303 | } | |
304 | ||
305 | /** | |
306 | * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading | |
307 | * \return 1 if the syncword is found 0 otherwise. | |
308 | */ | |
309 | static int nuv_resync(AVFormatContext *s, int64_t pos_limit) { | |
310 | AVIOContext *pb = s->pb; | |
311 | uint32_t tag = 0; | |
312 | while(!avio_feof(pb) && avio_tell(pb) < pos_limit) { | |
313 | tag = (tag << 8) | avio_r8(pb); | |
314 | if (tag == MKBETAG('R','T','j','j') && | |
315 | (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') && | |
316 | (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j')) | |
317 | return 1; | |
318 | } | |
319 | return 0; | |
320 | } | |
321 | ||
322 | /** | |
323 | * \brief attempts to read a timestamp from stream at the given stream position | |
324 | * \return timestamp if successful and AV_NOPTS_VALUE if failure | |
325 | */ | |
326 | static int64_t nuv_read_dts(AVFormatContext *s, int stream_index, | |
327 | int64_t *ppos, int64_t pos_limit) | |
328 | { | |
329 | NUVContext *ctx = s->priv_data; | |
330 | AVIOContext *pb = s->pb; | |
331 | uint8_t hdr[HDRSIZE]; | |
332 | nuv_frametype frametype; | |
333 | int size, key, idx; | |
334 | int64_t pos, dts; | |
335 | ||
336 | if (avio_seek(pb, *ppos, SEEK_SET) < 0) | |
337 | return AV_NOPTS_VALUE; | |
338 | ||
339 | if (!nuv_resync(s, pos_limit)) | |
340 | return AV_NOPTS_VALUE; | |
341 | ||
342 | while (!avio_feof(pb) && avio_tell(pb) < pos_limit) { | |
343 | if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE) | |
344 | return AV_NOPTS_VALUE; | |
345 | frametype = hdr[0]; | |
346 | size = PKTSIZE(AV_RL32(&hdr[8])); | |
347 | switch (frametype) { | |
348 | case NUV_SEEKP: | |
349 | break; | |
350 | case NUV_AUDIO: | |
351 | case NUV_VIDEO: | |
352 | if (frametype == NUV_VIDEO) { | |
353 | idx = ctx->v_id; | |
354 | key = hdr[2] == 0; | |
355 | } else { | |
356 | idx = ctx->a_id; | |
357 | key = 1; | |
358 | } | |
359 | if (stream_index == idx) { | |
360 | ||
361 | pos = avio_tell(s->pb) - HDRSIZE; | |
362 | dts = AV_RL32(&hdr[4]); | |
363 | ||
364 | // TODO - add general support in av_gen_search, so it adds positions after reading timestamps | |
365 | av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0, | |
366 | key ? AVINDEX_KEYFRAME : 0); | |
367 | ||
368 | *ppos = pos; | |
369 | return dts; | |
370 | } | |
371 | default: | |
372 | avio_skip(pb, size); | |
373 | break; | |
374 | } | |
375 | } | |
376 | return AV_NOPTS_VALUE; | |
377 | } | |
378 | ||
379 | ||
380 | AVInputFormat ff_nuv_demuxer = { | |
381 | .name = "nuv", | |
382 | .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"), | |
383 | .priv_data_size = sizeof(NUVContext), | |
384 | .read_probe = nuv_probe, | |
385 | .read_header = nuv_header, | |
386 | .read_packet = nuv_packet, | |
387 | .read_timestamp = nuv_read_dts, | |
388 | .flags = AVFMT_GENERIC_INDEX, | |
389 | }; |