FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/rmenc.c
Date: 2022-12-05 20:26:17
Exec Total Coverage
Lines: 250 268 93.3%
Functions: 9 9 100.0%
Branches: 68 80 85.0%

Line Branch Exec Source
1 /*
2 * "Real" compatible muxer.
3 * Copyright (c) 2000, 2001 Fabrice Bellard
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 #include "avformat.h"
22 #include "avio_internal.h"
23 #include "rm.h"
24 #include "libavutil/dict.h"
25
26 typedef struct StreamInfo {
27 int nb_packets;
28 int packet_total_size;
29 int packet_max_size;
30 /* codec related output */
31 int bit_rate;
32 AVRational frame_rate;
33 int nb_frames; /* current frame number */
34 int total_frames; /* total number of frames */
35 int num;
36 AVCodecParameters *par;
37 } StreamInfo;
38
39 typedef struct RMMuxContext {
40 StreamInfo streams[2];
41 StreamInfo *audio_stream, *video_stream;
42 int data_pos; /* position of the data after the header */
43 } RMMuxContext;
44
45 /* in ms */
46 #define BUFFER_DURATION 0
47 /* the header needs at most 7 + 4 + 12 B */
48 #define MAX_HEADER_SIZE (7 + 4 + 12)
49 /* UINT16_MAX is the maximal chunk size */
50 #define MAX_PACKET_SIZE (UINT16_MAX - MAX_HEADER_SIZE)
51
52
53 64 static void put_str(AVIOContext *s, const char *tag)
54 {
55 64 avio_wb16(s,strlen(tag));
56
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80 while (*tag) {
57 16 avio_w8(s, *tag++);
58 }
59 64 }
60
61 40 static void put_str8(AVIOContext *s, const char *tag)
62 {
63 40 avio_w8(s, strlen(tag));
64
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704 while (*tag) {
65 664 avio_w8(s, *tag++);
66 }
67 40 }
68
69 16 static int rv10_write_header(AVFormatContext *ctx,
70 int data_size, int index_pos)
71 {
72 16 RMMuxContext *rm = ctx->priv_data;
73 16 AVIOContext *s = ctx->pb;
74 StreamInfo *stream;
75 const char *desc, *mimetype;
76 int nb_packets, packet_total_size, packet_max_size, size, packet_avg_size, i;
77 int bit_rate, v, duration, flags;
78 int data_offset;
79 AVDictionaryEntry *tag;
80
81 16 ffio_wfourcc(s, ".RMF");
82 16 avio_wb32(s,18); /* header size */
83 16 avio_wb16(s,0);
84 16 avio_wb32(s,0);
85 16 avio_wb32(s,4 + ctx->nb_streams); /* num headers */
86
87 16 ffio_wfourcc(s,"PROP");
88 16 avio_wb32(s, 50);
89 16 avio_wb16(s, 0);
90 16 packet_max_size = 0;
91 16 packet_total_size = 0;
92 16 nb_packets = 0;
93 16 bit_rate = 0;
94 16 duration = 0;
95
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34 for(i=0;i<ctx->nb_streams;i++) {
96 18 StreamInfo *stream = &rm->streams[i];
97 18 bit_rate += stream->bit_rate;
98
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18 if (stream->packet_max_size > packet_max_size)
99 16 packet_max_size = stream->packet_max_size;
100 18 nb_packets += stream->nb_packets;
101 18 packet_total_size += stream->packet_total_size;
102 /* select maximum duration */
103 18 v = av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO);
104
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18 if (v > duration)
105 8 duration = v;
106 }
107 16 avio_wb32(s, bit_rate); /* max bit rate */
108 16 avio_wb32(s, bit_rate); /* avg bit rate */
109 16 avio_wb32(s, packet_max_size); /* max packet size */
110
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16 if (nb_packets > 0)
111 8 packet_avg_size = packet_total_size / nb_packets;
112 else
113 8 packet_avg_size = 0;
114 16 avio_wb32(s, packet_avg_size); /* avg packet size */
115 16 avio_wb32(s, nb_packets); /* num packets */
116 16 avio_wb32(s, duration); /* duration */
117 16 avio_wb32(s, BUFFER_DURATION); /* preroll */
118 16 avio_wb32(s, index_pos); /* index offset */
119 /* computation of data the data offset */
120 16 data_offset = avio_tell(s);
121 16 avio_wb32(s, 0); /* data offset : will be patched after */
122 16 avio_wb16(s, ctx->nb_streams); /* num streams */
123 16 flags = 1 | 2; /* save allowed & perfect play */
124
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16 if (!(s->seekable & AVIO_SEEKABLE_NORMAL))
125 flags |= 4; /* live broadcast */
126 16 avio_wb16(s, flags);
127
128 /* comments */
129
130 16 ffio_wfourcc(s,"CONT");
131 16 size = 4 * 2 + 10;
132
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80 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
133 64 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
134
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64 if(tag) size += strlen(tag->value);
135 }
136 16 avio_wb32(s,size);
137 16 avio_wb16(s,0);
138
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80 for(i=0; i<FF_ARRAY_ELEMS(ff_rm_metadata); i++) {
139 64 tag = av_dict_get(ctx->metadata, ff_rm_metadata[i], NULL, 0);
140
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64 put_str(s, tag ? tag->value : "");
141 }
142
143
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34 for(i=0;i<ctx->nb_streams;i++) {
144 int codec_data_size;
145
146 18 stream = &rm->streams[i];
147
148
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18 if (stream->par->codec_type == AVMEDIA_TYPE_AUDIO) {
149 4 desc = "The Audio Stream";
150 4 mimetype = "audio/x-pn-realaudio";
151 4 codec_data_size = 73;
152 } else {
153 14 desc = "The Video Stream";
154 14 mimetype = "video/x-pn-realvideo";
155 14 codec_data_size = 34;
156 }
157
158 18 ffio_wfourcc(s,"MDPR");
159 18 size = 10 + 9 * 4 + strlen(desc) + strlen(mimetype) + codec_data_size;
160 18 avio_wb32(s, size);
161 18 avio_wb16(s, 0);
162
163 18 avio_wb16(s, i); /* stream number */
164 18 avio_wb32(s, stream->bit_rate); /* max bit rate */
165 18 avio_wb32(s, stream->bit_rate); /* avg bit rate */
166 18 avio_wb32(s, stream->packet_max_size); /* max packet size */
167
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18 if (stream->nb_packets > 0)
168 9 packet_avg_size = stream->packet_total_size /
169 9 stream->nb_packets;
170 else
171 9 packet_avg_size = 0;
172 18 avio_wb32(s, packet_avg_size); /* avg packet size */
173 18 avio_wb32(s, 0); /* start time */
174 18 avio_wb32(s, BUFFER_DURATION); /* preroll */
175 /* duration */
176
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18 if (!(s->seekable & AVIO_SEEKABLE_NORMAL) || !stream->total_frames)
177 9 avio_wb32(s, (int)(3600 * 1000));
178 else
179 9 avio_wb32(s, av_rescale_q_rnd(stream->total_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO));
180 18 put_str8(s, desc);
181 18 put_str8(s, mimetype);
182 18 avio_wb32(s, codec_data_size);
183
184
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18 if (stream->par->codec_type == AVMEDIA_TYPE_AUDIO) {
185 int coded_frame_size, fscode, sample_rate;
186 4 int frame_size = av_get_audio_frame_duration2(stream->par, 0);
187 4 sample_rate = stream->par->sample_rate;
188 4 coded_frame_size = (stream->par->bit_rate *
189 4 frame_size) / (8 * sample_rate);
190 /* audio codec info */
191 4 avio_write(s, ".ra", 3);
192 4 avio_w8(s, 0xfd);
193 4 avio_wb32(s, 0x00040000); /* version */
194 4 ffio_wfourcc(s, ".ra4");
195 4 avio_wb32(s, 0x01b53530); /* stream length */
196 4 avio_wb16(s, 4); /* unknown */
197 4 avio_wb32(s, 0x39); /* header size */
198
199
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4 switch(sample_rate) {
200 case 48000:
201 case 24000:
202 case 12000:
203 fscode = 1;
204 break;
205 2 default:
206 case 44100:
207 case 22050:
208 case 11025:
209 2 fscode = 2;
210 2 break;
211 2 case 32000:
212 case 16000:
213 case 8000:
214 2 fscode = 3;
215 }
216 4 avio_wb16(s, fscode); /* codec additional info, for AC-3, seems
217 to be a frequency code */
218 /* special hack to compensate rounding errors... */
219
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4 if (coded_frame_size == 557)
220 coded_frame_size--;
221 4 avio_wb32(s, coded_frame_size); /* frame length */
222 4 avio_wb32(s, 0x51540); /* unknown */
223 4 avio_wb32(s, stream->par->bit_rate / 8 * 60); /* bytes per minute */
224 4 avio_wb32(s, stream->par->bit_rate / 8 * 60); /* bytes per minute */
225 4 avio_wb16(s, 0x01);
226 /* frame length : seems to be very important */
227 4 avio_wb16(s, coded_frame_size);
228 4 avio_wb32(s, 0); /* unknown */
229 4 avio_wb16(s, stream->par->sample_rate); /* sample rate */
230 4 avio_wb32(s, 0x10); /* unknown */
231 4 avio_wb16(s, stream->par->ch_layout.nb_channels);
232 4 put_str8(s, "Int0"); /* codec name */
233
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4 if (stream->par->codec_tag) {
234 4 avio_w8(s, 4); /* tag length */
235 4 avio_wl32(s, stream->par->codec_tag);
236 } else {
237 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
238 return -1;
239 }
240 4 avio_wb16(s, 0); /* title length */
241 4 avio_wb16(s, 0); /* author length */
242 4 avio_wb16(s, 0); /* copyright length */
243 4 avio_w8(s, 0); /* end of header */
244 } else {
245 /* video codec info */
246 14 avio_wb32(s,34); /* size */
247 14 ffio_wfourcc(s, "VIDO");
248
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14 if(stream->par->codec_id == AV_CODEC_ID_RV10)
249 8 ffio_wfourcc(s,"RV10");
250 else
251 6 ffio_wfourcc(s,"RV20");
252 14 avio_wb16(s, stream->par->width);
253 14 avio_wb16(s, stream->par->height);
254
255
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14 if (stream->frame_rate.num / stream->frame_rate.den > 65535) {
256 av_log(s, AV_LOG_ERROR, "Frame rate %d is too high\n", stream->frame_rate.num / stream->frame_rate.den);
257 return AVERROR(EINVAL);
258 }
259
260 14 avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* frames per seconds ? */
261 14 avio_wb32(s,0); /* unknown meaning */
262 14 avio_wb16(s, stream->frame_rate.num / stream->frame_rate.den); /* unknown meaning */
263 14 avio_wb32(s,0); /* unknown meaning */
264 14 avio_wb16(s, 8); /* unknown meaning */
265 /* Seems to be the codec version: only use basic H.263. The next
266 versions seems to add a differential DC coding as in
267 MPEG... nothing new under the sun. */
268
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14 if(stream->par->codec_id == AV_CODEC_ID_RV10)
269 8 avio_wb32(s,0x10000000);
270 else
271 6 avio_wb32(s,0x20103001);
272 //avio_wb32(s,0x10003000);
273 }
274 }
275
276 /* patch data offset field */
277 16 rm->data_pos = avio_tell(s);
278
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16 if (avio_seek(s, data_offset, SEEK_SET) >= 0) {
279 16 avio_wb32(s, rm->data_pos);
280 16 avio_seek(s, rm->data_pos, SEEK_SET);
281 }
282
283 /* data stream */
284 16 ffio_wfourcc(s, "DATA");
285 16 avio_wb32(s,data_size + 10 + 8);
286 16 avio_wb16(s,0);
287
288 16 avio_wb32(s, nb_packets); /* number of packets */
289 16 avio_wb32(s,0); /* next data header */
290 16 return 0;
291 }
292
293 655 static void write_packet_header(AVFormatContext *ctx, StreamInfo *stream,
294 int length, int key_frame)
295 {
296 int timestamp;
297 655 AVIOContext *s = ctx->pb;
298
299 655 stream->nb_packets++;
300 655 stream->packet_total_size += length;
301
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655 if (length > stream->packet_max_size)
302 28 stream->packet_max_size = length;
303
304 655 avio_wb16(s,0); /* version */
305 655 avio_wb16(s,length + 12);
306 655 avio_wb16(s, stream->num); /* stream number */
307 655 timestamp = av_rescale_q_rnd(stream->nb_frames, (AVRational){1000, 1}, stream->frame_rate, AV_ROUND_ZERO);
308 655 avio_wb32(s, timestamp); /* timestamp */
309 655 avio_w8(s, 0); /* reserved */
310
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655 avio_w8(s, key_frame ? 2 : 0); /* flags */
311 655 }
312
313 8 static int rm_write_header(AVFormatContext *s)
314 {
315 8 RMMuxContext *rm = s->priv_data;
316 StreamInfo *stream;
317 int n;
318 AVCodecParameters *par;
319
320
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8 if (s->nb_streams > 2) {
321 av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n");
322 return AVERROR_PATCHWELCOME;
323 }
324
325
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17 for(n=0;n<s->nb_streams;n++) {
326 9 AVStream *st = s->streams[n];
327 int frame_size;
328
329 9 s->streams[n]->id = n;
330 9 par = s->streams[n]->codecpar;
331 9 stream = &rm->streams[n];
332 9 memset(stream, 0, sizeof(StreamInfo));
333 9 stream->num = n;
334 9 stream->bit_rate = par->bit_rate;
335 9 stream->par = par;
336
337
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9 switch (par->codec_type) {
338 2 case AVMEDIA_TYPE_AUDIO:
339 2 rm->audio_stream = stream;
340 2 frame_size = av_get_audio_frame_duration2(par, 0);
341 2 stream->frame_rate = (AVRational){par->sample_rate, frame_size};
342 /* XXX: dummy values */
343 2 stream->packet_max_size = 1024;
344 2 stream->nb_packets = 0;
345 2 stream->total_frames = stream->nb_packets;
346 9 break;
347 7 case AVMEDIA_TYPE_VIDEO:
348 7 rm->video_stream = stream;
349 // TODO: should be avg_frame_rate
350 7 stream->frame_rate = av_inv_q(st->time_base);
351 /* XXX: dummy values */
352 7 stream->packet_max_size = 4096;
353 7 stream->nb_packets = 0;
354 7 stream->total_frames = stream->nb_packets;
355 7 break;
356 default:
357 return -1;
358 }
359 }
360
361
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8 if (rv10_write_header(s, 0, 0))
362 return AVERROR_INVALIDDATA;
363 8 return 0;
364 }
365
366 330 static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
367 {
368 330 RMMuxContext *rm = s->priv_data;
369 330 AVIOContext *pb = s->pb;
370 330 StreamInfo *stream = rm->audio_stream;
371 int i;
372
373 330 write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
374
375
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330 if (stream->par->codec_id == AV_CODEC_ID_AC3) {
376 /* for AC-3, the words seem to be reversed */
377
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4069 for (i = 0; i < size; i += 2) {
378 4040 avio_w8(pb, buf[i + 1]);
379 4040 avio_w8(pb, buf[i]);
380 }
381 } else {
382 301 avio_write(pb, buf, size);
383 }
384 330 stream->nb_frames++;
385 330 return 0;
386 }
387
388 325 static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
389 {
390 325 RMMuxContext *rm = s->priv_data;
391 325 AVIOContext *pb = s->pb;
392 325 StreamInfo *stream = rm->video_stream;
393 325 int key_frame = !!(flags & AV_PKT_FLAG_KEY);
394
395 /* XXX: this is incorrect: should be a parameter */
396
397 /* Well, I spent some time finding the meaning of these bits. I am
398 not sure I understood everything, but it works !! */
399
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325 if (size > MAX_PACKET_SIZE) {
400 av_log(s, AV_LOG_ERROR, "Muxing packets larger than 64 kB (%d) is not supported\n", size);
401 return AVERROR_PATCHWELCOME;
402 }
403
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325 write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
404 /* bit 7: '1' if final packet of a frame converted in several packets */
405 325 avio_w8(pb, 0x81);
406 /* bit 7: '1' if I-frame. bits 6..0 : sequence number in current
407 frame starting from 1 */
408
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325 if (key_frame) {
409 33 avio_w8(pb, 0x81);
410 } else {
411 292 avio_w8(pb, 0x01);
412 }
413
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325 if(size >= 0x4000){
414 14 avio_wb32(pb, size); /* total frame size */
415 14 avio_wb32(pb, size); /* offset from the start or the end */
416 }else{
417 311 avio_wb16(pb, 0x4000 | size); /* total frame size */
418 311 avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
419 }
420 325 avio_w8(pb, stream->nb_frames & 0xff);
421
422 325 avio_write(pb, buf, size);
423
424 325 stream->nb_frames++;
425 325 return 0;
426 }
427
428 655 static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
429 {
430
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655 if (s->streams[pkt->stream_index]->codecpar->codec_type ==
431 AVMEDIA_TYPE_AUDIO)
432 330 return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
433 else
434 325 return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
435 }
436
437 8 static int rm_write_trailer(AVFormatContext *s)
438 {
439 8 RMMuxContext *rm = s->priv_data;
440 int data_size, index_pos, i;
441 8 AVIOContext *pb = s->pb;
442
443
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8 if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
444 /* end of file: finish to write header */
445 8 index_pos = avio_tell(pb);
446 8 data_size = index_pos - rm->data_pos;
447
448 /* FIXME: write index */
449
450 /* undocumented end header */
451 8 avio_wb32(pb, 0);
452 8 avio_wb32(pb, 0);
453
454 8 avio_seek(pb, 0, SEEK_SET);
455
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17 for(i=0;i<s->nb_streams;i++)
456 9 rm->streams[i].total_frames = rm->streams[i].nb_frames;
457 8 rv10_write_header(s, data_size, 0);
458 } else {
459 /* undocumented end header */
460 avio_wb32(pb, 0);
461 avio_wb32(pb, 0);
462 }
463
464 8 return 0;
465 }
466
467
468 const AVOutputFormat ff_rm_muxer = {
469 .name = "rm",
470 .long_name = NULL_IF_CONFIG_SMALL("RealMedia"),
471 .mime_type = "application/vnd.rn-realmedia",
472 .extensions = "rm,ra",
473 .priv_data_size = sizeof(RMMuxContext),
474 .audio_codec = AV_CODEC_ID_AC3,
475 .video_codec = AV_CODEC_ID_RV10,
476 .write_header = rm_write_header,
477 .write_packet = rm_write_packet,
478 .write_trailer = rm_write_trailer,
479 .codec_tag = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 },
480 };
481