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/imgutils.h"
24 #include "libavutil/intreadwrite.h"
25 #include "libavutil/intfloat.h"
26 #include "avformat.h"
27 #include "internal.h"
28 #include "riff.h"
29
30 static const AVCodecTag nuv_audio_tags[] = {
31 { AV_CODEC_ID_PCM_S16LE, MKTAG('R', 'A', 'W', 'A') },
32 { AV_CODEC_ID_MP3, MKTAG('L', 'A', 'M', 'E') },
33 { AV_CODEC_ID_NONE, 0 },
34 };
35
36 typedef struct NUVContext {
37 int v_id;
38 int a_id;
39 int rtjpg_video;
40 } NUVContext;
41
42 typedef enum {
43 NUV_VIDEO = 'V',
44 NUV_EXTRADATA = 'D',
45 NUV_AUDIO = 'A',
46 NUV_SEEKP = 'R',
47 NUV_MYTHEXT = 'X'
48 } nuv_frametype;
49
nuv_probe(const AVProbeData * p)50 static int nuv_probe(const AVProbeData *p)
51 {
52 if (!memcmp(p->buf, "NuppelVideo", 12))
53 return AVPROBE_SCORE_MAX;
54 if (!memcmp(p->buf, "MythTVVideo", 12))
55 return AVPROBE_SCORE_MAX;
56 return 0;
57 }
58
59 /// little macro to sanitize packet size
60 #define PKTSIZE(s) (s & 0xffffff)
61
62 /**
63 * @brief read until we found all data needed for decoding
64 * @param vst video stream of which to change parameters
65 * @param ast video stream of which to change parameters
66 * @param myth set if this is a MythTVVideo format file
67 * @return 0 or AVERROR code
68 */
get_codec_data(AVFormatContext * s,AVIOContext * pb,AVStream * vst,AVStream * ast,int myth)69 static int get_codec_data(AVFormatContext *s, AVIOContext *pb, AVStream *vst,
70 AVStream *ast, int myth)
71 {
72 nuv_frametype frametype;
73
74 if (!vst && !myth)
75 return 1; // no codec data needed
76 while (!avio_feof(pb)) {
77 int size, subtype, ret;
78
79 frametype = avio_r8(pb);
80 switch (frametype) {
81 case NUV_EXTRADATA:
82 subtype = avio_r8(pb);
83 avio_skip(pb, 6);
84 size = PKTSIZE(avio_rl32(pb));
85 if (vst && subtype == 'R') {
86 if ((ret = ff_get_extradata(NULL, vst->codecpar, pb, size)) < 0)
87 return ret;
88 size = 0;
89 if (!myth)
90 return 0;
91 }
92 break;
93 case NUV_MYTHEXT:
94 avio_skip(pb, 7);
95 size = PKTSIZE(avio_rl32(pb));
96 if (size != 128 * 4)
97 break;
98 avio_rl32(pb); // version
99 if (vst) {
100 vst->codecpar->codec_tag = avio_rl32(pb);
101 vst->codecpar->codec_id =
102 ff_codec_get_id(ff_codec_bmp_tags, vst->codecpar->codec_tag);
103 if (vst->codecpar->codec_tag == MKTAG('R', 'J', 'P', 'G'))
104 vst->codecpar->codec_id = AV_CODEC_ID_NUV;
105 } else
106 avio_skip(pb, 4);
107
108 if (ast) {
109 int id;
110
111 ast->codecpar->codec_tag = avio_rl32(pb);
112 ast->codecpar->sample_rate = avio_rl32(pb);
113 if (ast->codecpar->sample_rate <= 0) {
114 av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
115 return AVERROR_INVALIDDATA;
116 }
117 ast->codecpar->bits_per_coded_sample = avio_rl32(pb);
118 ast->codecpar->channels = avio_rl32(pb);
119 ast->codecpar->channel_layout = 0;
120 if (ast->codecpar->channels <= 0) {
121 av_log(s, AV_LOG_ERROR, "Invalid channels %d\n", ast->codecpar->channels);
122 return AVERROR_INVALIDDATA;
123 }
124
125 id = ff_wav_codec_get_id(ast->codecpar->codec_tag,
126 ast->codecpar->bits_per_coded_sample);
127 if (id == AV_CODEC_ID_NONE) {
128 id = ff_codec_get_id(nuv_audio_tags, ast->codecpar->codec_tag);
129 if (id == AV_CODEC_ID_PCM_S16LE)
130 id = ff_get_pcm_codec_id(ast->codecpar->bits_per_coded_sample,
131 0, 0, ~1);
132 }
133 ast->codecpar->codec_id = id;
134
135 ast->need_parsing = AVSTREAM_PARSE_FULL;
136 } else
137 avio_skip(pb, 4 * 4);
138
139 size -= 6 * 4;
140 avio_skip(pb, size);
141 return 0;
142 case NUV_SEEKP:
143 size = 11;
144 break;
145 default:
146 avio_skip(pb, 7);
147 size = PKTSIZE(avio_rl32(pb));
148 break;
149 }
150 avio_skip(pb, size);
151 }
152
153 return 0;
154 }
155
nuv_header(AVFormatContext * s)156 static int nuv_header(AVFormatContext *s)
157 {
158 NUVContext *ctx = s->priv_data;
159 AVIOContext *pb = s->pb;
160 char id_string[12];
161 double aspect, fps;
162 int is_mythtv, width, height, v_packs, a_packs, ret;
163 AVStream *vst = NULL, *ast = NULL;
164
165 avio_read(pb, id_string, 12);
166 is_mythtv = !memcmp(id_string, "MythTVVideo", 12);
167 avio_skip(pb, 5); // version string
168 avio_skip(pb, 3); // padding
169 width = avio_rl32(pb);
170 height = avio_rl32(pb);
171 avio_rl32(pb); // unused, "desiredwidth"
172 avio_rl32(pb); // unused, "desiredheight"
173 avio_r8(pb); // 'P' == progressive, 'I' == interlaced
174 avio_skip(pb, 3); // padding
175 aspect = av_int2double(avio_rl64(pb));
176 if (aspect > 0.9999 && aspect < 1.0001)
177 aspect = 4.0 / 3.0;
178 fps = av_int2double(avio_rl64(pb));
179 if (fps < 0.0f) {
180 if (s->error_recognition & AV_EF_EXPLODE) {
181 av_log(s, AV_LOG_ERROR, "Invalid frame rate %f\n", fps);
182 return AVERROR_INVALIDDATA;
183 } else {
184 av_log(s, AV_LOG_WARNING, "Invalid frame rate %f, setting to 0.\n", fps);
185 fps = 0.0f;
186 }
187 }
188
189 // number of packets per stream type, -1 means unknown, e.g. streaming
190 v_packs = avio_rl32(pb);
191 a_packs = avio_rl32(pb);
192 avio_rl32(pb); // text
193
194 avio_rl32(pb); // keyframe distance (?)
195
196 if (v_packs) {
197 vst = avformat_new_stream(s, NULL);
198 if (!vst)
199 return AVERROR(ENOMEM);
200 ctx->v_id = vst->index;
201
202 ret = av_image_check_size(width, height, 0, s);
203 if (ret < 0)
204 return ret;
205
206 vst->codecpar->codec_type = AVMEDIA_TYPE_VIDEO;
207 vst->codecpar->codec_id = AV_CODEC_ID_NUV;
208 vst->codecpar->width = width;
209 vst->codecpar->height = height;
210 vst->codecpar->bits_per_coded_sample = 10;
211 vst->sample_aspect_ratio = av_d2q(aspect * height / width,
212 10000);
213 #if FF_API_R_FRAME_RATE
214 vst->r_frame_rate =
215 #endif
216 vst->avg_frame_rate = av_d2q(fps, 60000);
217 avpriv_set_pts_info(vst, 32, 1, 1000);
218 } else
219 ctx->v_id = -1;
220
221 if (a_packs) {
222 ast = avformat_new_stream(s, NULL);
223 if (!ast)
224 return AVERROR(ENOMEM);
225 ctx->a_id = ast->index;
226
227 ast->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
228 ast->codecpar->codec_id = AV_CODEC_ID_PCM_S16LE;
229 ast->codecpar->channels = 2;
230 ast->codecpar->channel_layout = AV_CH_LAYOUT_STEREO;
231 ast->codecpar->sample_rate = 44100;
232 ast->codecpar->bit_rate = 2 * 2 * 44100 * 8;
233 ast->codecpar->block_align = 2 * 2;
234 ast->codecpar->bits_per_coded_sample = 16;
235 avpriv_set_pts_info(ast, 32, 1, 1000);
236 } else
237 ctx->a_id = -1;
238
239 if ((ret = get_codec_data(s, pb, vst, ast, is_mythtv)) < 0)
240 return ret;
241
242 ctx->rtjpg_video = vst && vst->codecpar->codec_id == AV_CODEC_ID_NUV;
243
244 return 0;
245 }
246
247 #define HDRSIZE 12
248
nuv_packet(AVFormatContext * s,AVPacket * pkt)249 static int nuv_packet(AVFormatContext *s, AVPacket *pkt)
250 {
251 NUVContext *ctx = s->priv_data;
252 AVIOContext *pb = s->pb;
253 uint8_t hdr[HDRSIZE];
254 nuv_frametype frametype;
255 int ret, size;
256
257 while (!avio_feof(pb)) {
258 int copyhdrsize = ctx->rtjpg_video ? HDRSIZE : 0;
259 uint64_t pos = avio_tell(pb);
260
261 ret = avio_read(pb, hdr, HDRSIZE);
262 if (ret < HDRSIZE)
263 return ret < 0 ? ret : AVERROR(EIO);
264
265 frametype = hdr[0];
266 size = PKTSIZE(AV_RL32(&hdr[8]));
267
268 switch (frametype) {
269 case NUV_EXTRADATA:
270 if (!ctx->rtjpg_video) {
271 avio_skip(pb, size);
272 break;
273 }
274 case NUV_VIDEO:
275 if (ctx->v_id < 0) {
276 av_log(s, AV_LOG_ERROR, "Video packet in file without video stream!\n");
277 avio_skip(pb, size);
278 break;
279 }
280 ret = av_new_packet(pkt, copyhdrsize + size);
281 if (ret < 0)
282 return ret;
283
284 pkt->pos = pos;
285 pkt->flags |= hdr[2] == 0 ? AV_PKT_FLAG_KEY : 0;
286 pkt->pts = AV_RL32(&hdr[4]);
287 pkt->stream_index = ctx->v_id;
288 memcpy(pkt->data, hdr, copyhdrsize);
289 ret = avio_read(pb, pkt->data + copyhdrsize, size);
290 if (ret < 0) {
291 return ret;
292 }
293 if (ret < size)
294 av_shrink_packet(pkt, copyhdrsize + ret);
295 return 0;
296 case NUV_AUDIO:
297 if (ctx->a_id < 0) {
298 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
299 avio_skip(pb, size);
300 break;
301 }
302 ret = av_get_packet(pb, pkt, size);
303 pkt->flags |= AV_PKT_FLAG_KEY;
304 pkt->pos = pos;
305 pkt->pts = AV_RL32(&hdr[4]);
306 pkt->stream_index = ctx->a_id;
307 if (ret < 0)
308 return ret;
309 return 0;
310 case NUV_SEEKP:
311 // contains no data, size value is invalid
312 break;
313 default:
314 avio_skip(pb, size);
315 break;
316 }
317 }
318
319 return AVERROR(EIO);
320 }
321
322 /**
323 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
324 * \return 1 if the syncword is found 0 otherwise.
325 */
nuv_resync(AVFormatContext * s,int64_t pos_limit)326 static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
327 AVIOContext *pb = s->pb;
328 uint32_t tag = 0;
329 while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
330 tag = (tag << 8) | avio_r8(pb);
331 if (tag == MKBETAG('R','T','j','j') &&
332 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
333 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
334 return 1;
335 }
336 return 0;
337 }
338
339 /**
340 * \brief attempts to read a timestamp from stream at the given stream position
341 * \return timestamp if successful and AV_NOPTS_VALUE if failure
342 */
nuv_read_dts(AVFormatContext * s,int stream_index,int64_t * ppos,int64_t pos_limit)343 static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
344 int64_t *ppos, int64_t pos_limit)
345 {
346 NUVContext *ctx = s->priv_data;
347 AVIOContext *pb = s->pb;
348 uint8_t hdr[HDRSIZE];
349 nuv_frametype frametype;
350 int size, key, idx;
351 int64_t pos, dts;
352
353 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
354 return AV_NOPTS_VALUE;
355
356 if (!nuv_resync(s, pos_limit))
357 return AV_NOPTS_VALUE;
358
359 while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
360 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
361 return AV_NOPTS_VALUE;
362 frametype = hdr[0];
363 size = PKTSIZE(AV_RL32(&hdr[8]));
364 switch (frametype) {
365 case NUV_SEEKP:
366 break;
367 case NUV_AUDIO:
368 case NUV_VIDEO:
369 if (frametype == NUV_VIDEO) {
370 idx = ctx->v_id;
371 key = hdr[2] == 0;
372 } else {
373 idx = ctx->a_id;
374 key = 1;
375 }
376 if (stream_index == idx) {
377
378 pos = avio_tell(s->pb) - HDRSIZE;
379 dts = AV_RL32(&hdr[4]);
380
381 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
382 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
383 key ? AVINDEX_KEYFRAME : 0);
384
385 *ppos = pos;
386 return dts;
387 }
388 default:
389 avio_skip(pb, size);
390 break;
391 }
392 }
393 return AV_NOPTS_VALUE;
394 }
395
396
397 AVInputFormat ff_nuv_demuxer = {
398 .name = "nuv",
399 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
400 .priv_data_size = sizeof(NUVContext),
401 .read_probe = nuv_probe,
402 .read_header = nuv_header,
403 .read_packet = nuv_packet,
404 .read_timestamp = nuv_read_dts,
405 .flags = AVFMT_GENERIC_INDEX,
406 };
407