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path: root/libavformat/nuv.c (plain)
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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
30static 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
36typedef struct NUVContext {
37 int v_id;
38 int a_id;
39 int rtjpg_video;
40} NUVContext;
41
42typedef 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
50static int nuv_probe(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 */
69static 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;
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 (vst->codecpar->extradata) {
87 av_freep(&vst->codecpar->extradata);
88 vst->codecpar->extradata_size = 0;
89 }
90 if (ff_get_extradata(NULL, vst->codecpar, pb, size) < 0)
91 return AVERROR(ENOMEM);
92 size = 0;
93 if (!myth)
94 return 0;
95 }
96 break;
97 case NUV_MYTHEXT:
98 avio_skip(pb, 7);
99 size = PKTSIZE(avio_rl32(pb));
100 if (size != 128 * 4)
101 break;
102 avio_rl32(pb); // version
103 if (vst) {
104 vst->codecpar->codec_tag = avio_rl32(pb);
105 vst->codecpar->codec_id =
106 ff_codec_get_id(ff_codec_bmp_tags, vst->codecpar->codec_tag);
107 if (vst->codecpar->codec_tag == MKTAG('R', 'J', 'P', 'G'))
108 vst->codecpar->codec_id = AV_CODEC_ID_NUV;
109 } else
110 avio_skip(pb, 4);
111
112 if (ast) {
113 int id;
114
115 ast->codecpar->codec_tag = avio_rl32(pb);
116 ast->codecpar->sample_rate = avio_rl32(pb);
117 if (ast->codecpar->sample_rate <= 0) {
118 av_log(s, AV_LOG_ERROR, "Invalid sample rate %d\n", ast->codecpar->sample_rate);
119 return AVERROR_INVALIDDATA;
120 }
121 ast->codecpar->bits_per_coded_sample = avio_rl32(pb);
122 ast->codecpar->channels = avio_rl32(pb);
123 ast->codecpar->channel_layout = 0;
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
156static 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
249static 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 av_packet_unref(pkt);
292 return ret;
293 }
294 if (ret < size)
295 av_shrink_packet(pkt, copyhdrsize + ret);
296 return 0;
297 case NUV_AUDIO:
298 if (ctx->a_id < 0) {
299 av_log(s, AV_LOG_ERROR, "Audio packet in file without audio stream!\n");
300 avio_skip(pb, size);
301 break;
302 }
303 ret = av_get_packet(pb, pkt, size);
304 pkt->flags |= AV_PKT_FLAG_KEY;
305 pkt->pos = pos;
306 pkt->pts = AV_RL32(&hdr[4]);
307 pkt->stream_index = ctx->a_id;
308 if (ret < 0)
309 return ret;
310 return 0;
311 case NUV_SEEKP:
312 // contains no data, size value is invalid
313 break;
314 default:
315 avio_skip(pb, size);
316 break;
317 }
318 }
319
320 return AVERROR(EIO);
321}
322
323/**
324 * \brief looks for the string RTjjjjjjjjjj in the stream too resync reading
325 * \return 1 if the syncword is found 0 otherwise.
326 */
327static int nuv_resync(AVFormatContext *s, int64_t pos_limit) {
328 AVIOContext *pb = s->pb;
329 uint32_t tag = 0;
330 while(!avio_feof(pb) && avio_tell(pb) < pos_limit) {
331 tag = (tag << 8) | avio_r8(pb);
332 if (tag == MKBETAG('R','T','j','j') &&
333 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j') &&
334 (tag = avio_rb32(pb)) == MKBETAG('j','j','j','j'))
335 return 1;
336 }
337 return 0;
338}
339
340/**
341 * \brief attempts to read a timestamp from stream at the given stream position
342 * \return timestamp if successful and AV_NOPTS_VALUE if failure
343 */
344static int64_t nuv_read_dts(AVFormatContext *s, int stream_index,
345 int64_t *ppos, int64_t pos_limit)
346{
347 NUVContext *ctx = s->priv_data;
348 AVIOContext *pb = s->pb;
349 uint8_t hdr[HDRSIZE];
350 nuv_frametype frametype;
351 int size, key, idx;
352 int64_t pos, dts;
353
354 if (avio_seek(pb, *ppos, SEEK_SET) < 0)
355 return AV_NOPTS_VALUE;
356
357 if (!nuv_resync(s, pos_limit))
358 return AV_NOPTS_VALUE;
359
360 while (!avio_feof(pb) && avio_tell(pb) < pos_limit) {
361 if (avio_read(pb, hdr, HDRSIZE) < HDRSIZE)
362 return AV_NOPTS_VALUE;
363 frametype = hdr[0];
364 size = PKTSIZE(AV_RL32(&hdr[8]));
365 switch (frametype) {
366 case NUV_SEEKP:
367 break;
368 case NUV_AUDIO:
369 case NUV_VIDEO:
370 if (frametype == NUV_VIDEO) {
371 idx = ctx->v_id;
372 key = hdr[2] == 0;
373 } else {
374 idx = ctx->a_id;
375 key = 1;
376 }
377 if (stream_index == idx) {
378
379 pos = avio_tell(s->pb) - HDRSIZE;
380 dts = AV_RL32(&hdr[4]);
381
382 // TODO - add general support in av_gen_search, so it adds positions after reading timestamps
383 av_add_index_entry(s->streams[stream_index], pos, dts, size + HDRSIZE, 0,
384 key ? AVINDEX_KEYFRAME : 0);
385
386 *ppos = pos;
387 return dts;
388 }
389 default:
390 avio_skip(pb, size);
391 break;
392 }
393 }
394 return AV_NOPTS_VALUE;
395}
396
397
398AVInputFormat ff_nuv_demuxer = {
399 .name = "nuv",
400 .long_name = NULL_IF_CONFIG_SMALL("NuppelVideo"),
401 .priv_data_size = sizeof(NUVContext),
402 .read_probe = nuv_probe,
403 .read_header = nuv_header,
404 .read_packet = nuv_packet,
405 .read_timestamp = nuv_read_dts,
406 .flags = AVFMT_GENERIC_INDEX,
407};
408
generated by cgit at 2024-05-17 20:31:49 (GMT)