LCOV - code coverage report
Current view: top level - libavformat - rmenc.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 251 269 93.3 %
Date: 2017-12-11 04:34:20 Functions: 9 9 100.0 %

          Line data    Source code
       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         144 :     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         744 :     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          34 :     for(i=0;i<ctx->nb_streams;i++) {
      96          18 :         StreamInfo *stream = &rm->streams[i];
      97          18 :         bit_rate += stream->bit_rate;
      98          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          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          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          16 :     if (!(s->seekable & AVIO_SEEKABLE_NORMAL))
     125           0 :         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          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          64 :         if(tag) size += strlen(tag->value);
     135             :     }
     136          16 :     avio_wb32(s,size);
     137          16 :     avio_wb16(s,0);
     138          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          64 :         put_str(s, tag ? tag->value : "");
     141             :     }
     142             : 
     143          34 :     for(i=0;i<ctx->nb_streams;i++) {
     144             :         int codec_data_size;
     145             : 
     146          18 :         stream = &rm->streams[i];
     147             : 
     148          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          18 :         if (stream->nb_packets > 0)
     168          18 :             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          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          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           8 :             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           4 :             switch(sample_rate) {
     200           0 :             case 48000:
     201             :             case 24000:
     202             :             case 12000:
     203           0 :                 fscode = 1;
     204           0 :                 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           4 :             if (coded_frame_size == 557)
     220           0 :                 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->channels);
     232           4 :             put_str8(s, "Int0"); /* codec name */
     233           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           0 :                 av_log(ctx, AV_LOG_ERROR, "Invalid codec tag\n");
     238           0 :                 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          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          14 :             if (stream->frame_rate.num / stream->frame_rate.den > 65535) {
     256           0 :                 av_log(s, AV_LOG_ERROR, "Frame rate %d is too high\n", stream->frame_rate.num / stream->frame_rate.den);
     257           0 :                 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          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          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         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         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           8 :     if (s->nb_streams > 2) {
     321           0 :         av_log(s, AV_LOG_ERROR, "At most 2 streams are currently supported for muxing in RM\n");
     322           0 :         return AVERROR_PATCHWELCOME;
     323             :     }
     324             : 
     325          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           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           2 :             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           0 :         default:
     357           0 :             return -1;
     358             :         }
     359             :     }
     360             : 
     361           8 :     if (rv10_write_header(s, 0, 0))
     362           0 :         return AVERROR_INVALIDDATA;
     363           8 :     avio_flush(s->pb);
     364           8 :     return 0;
     365             : }
     366             : 
     367         330 : static int rm_write_audio(AVFormatContext *s, const uint8_t *buf, int size, int flags)
     368             : {
     369         330 :     RMMuxContext *rm = s->priv_data;
     370         330 :     AVIOContext *pb = s->pb;
     371         330 :     StreamInfo *stream = rm->audio_stream;
     372             :     int i;
     373             : 
     374         330 :     write_packet_header(s, stream, size, !!(flags & AV_PKT_FLAG_KEY));
     375             : 
     376         330 :     if (stream->par->codec_id == AV_CODEC_ID_AC3) {
     377             :         /* for AC-3, the words seem to be reversed */
     378        4069 :         for (i = 0; i < size; i += 2) {
     379        4040 :             avio_w8(pb, buf[i + 1]);
     380        4040 :             avio_w8(pb, buf[i]);
     381             :         }
     382             :     } else {
     383         301 :         avio_write(pb, buf, size);
     384             :     }
     385         330 :     stream->nb_frames++;
     386         330 :     return 0;
     387             : }
     388             : 
     389         325 : static int rm_write_video(AVFormatContext *s, const uint8_t *buf, int size, int flags)
     390             : {
     391         325 :     RMMuxContext *rm = s->priv_data;
     392         325 :     AVIOContext *pb = s->pb;
     393         325 :     StreamInfo *stream = rm->video_stream;
     394         325 :     int key_frame = !!(flags & AV_PKT_FLAG_KEY);
     395             : 
     396             :     /* XXX: this is incorrect: should be a parameter */
     397             : 
     398             :     /* Well, I spent some time finding the meaning of these bits. I am
     399             :        not sure I understood everything, but it works !! */
     400         325 :     if (size > MAX_PACKET_SIZE) {
     401           0 :         av_log(s, AV_LOG_ERROR, "Muxing packets larger than 64 kB (%d) is not supported\n", size);
     402           0 :         return AVERROR_PATCHWELCOME;
     403             :     }
     404         325 :     write_packet_header(s, stream, size + 7 + (size >= 0x4000)*4, key_frame);
     405             :     /* bit 7: '1' if final packet of a frame converted in several packets */
     406         325 :     avio_w8(pb, 0x81);
     407             :     /* bit 7: '1' if I-frame. bits 6..0 : sequence number in current
     408             :        frame starting from 1 */
     409         325 :     if (key_frame) {
     410          33 :         avio_w8(pb, 0x81);
     411             :     } else {
     412         292 :         avio_w8(pb, 0x01);
     413             :     }
     414         325 :     if(size >= 0x4000){
     415          14 :         avio_wb32(pb, size); /* total frame size */
     416          14 :         avio_wb32(pb, size); /* offset from the start or the end */
     417             :     }else{
     418         311 :         avio_wb16(pb, 0x4000 | size); /* total frame size */
     419         311 :         avio_wb16(pb, 0x4000 | size); /* offset from the start or the end */
     420             :     }
     421         325 :     avio_w8(pb, stream->nb_frames & 0xff);
     422             : 
     423         325 :     avio_write(pb, buf, size);
     424             : 
     425         325 :     stream->nb_frames++;
     426         325 :     return 0;
     427             : }
     428             : 
     429         655 : static int rm_write_packet(AVFormatContext *s, AVPacket *pkt)
     430             : {
     431         655 :     if (s->streams[pkt->stream_index]->codecpar->codec_type ==
     432             :         AVMEDIA_TYPE_AUDIO)
     433         330 :         return rm_write_audio(s, pkt->data, pkt->size, pkt->flags);
     434             :     else
     435         325 :         return rm_write_video(s, pkt->data, pkt->size, pkt->flags);
     436             : }
     437             : 
     438           8 : static int rm_write_trailer(AVFormatContext *s)
     439             : {
     440           8 :     RMMuxContext *rm = s->priv_data;
     441             :     int data_size, index_pos, i;
     442           8 :     AVIOContext *pb = s->pb;
     443             : 
     444           8 :     if (s->pb->seekable & AVIO_SEEKABLE_NORMAL) {
     445             :         /* end of file: finish to write header */
     446           8 :         index_pos = avio_tell(pb);
     447           8 :         data_size = index_pos - rm->data_pos;
     448             : 
     449             :         /* FIXME: write index */
     450             : 
     451             :         /* undocumented end header */
     452           8 :         avio_wb32(pb, 0);
     453           8 :         avio_wb32(pb, 0);
     454             : 
     455           8 :         avio_seek(pb, 0, SEEK_SET);
     456          17 :         for(i=0;i<s->nb_streams;i++)
     457           9 :             rm->streams[i].total_frames = rm->streams[i].nb_frames;
     458           8 :         rv10_write_header(s, data_size, 0);
     459             :     } else {
     460             :         /* undocumented end header */
     461           0 :         avio_wb32(pb, 0);
     462           0 :         avio_wb32(pb, 0);
     463             :     }
     464             : 
     465           8 :     return 0;
     466             : }
     467             : 
     468             : 
     469             : AVOutputFormat ff_rm_muxer = {
     470             :     .name              = "rm",
     471             :     .long_name         = NULL_IF_CONFIG_SMALL("RealMedia"),
     472             :     .mime_type         = "application/vnd.rn-realmedia",
     473             :     .extensions        = "rm,ra",
     474             :     .priv_data_size    = sizeof(RMMuxContext),
     475             :     .audio_codec       = AV_CODEC_ID_AC3,
     476             :     .video_codec       = AV_CODEC_ID_RV10,
     477             :     .write_header      = rm_write_header,
     478             :     .write_packet      = rm_write_packet,
     479             :     .write_trailer     = rm_write_trailer,
     480             :     .codec_tag         = (const AVCodecTag* const []){ ff_rm_codec_tags, 0 },
     481             : };

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