libmpdemux/muxer.c

   1 /*
   2  * This file is part of MPlayer.
   3  *
   4  * MPlayer is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * MPlayer is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with MPlayer; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <inttypes.h>
  23 #include <unistd.h>
  24
  25 #include "config.h"
  26 #include "aviheader.h"
  27 #include "ms_hdr.h"
  28
  29 #include "stream/stream.h"
  30 #include "muxer.h"
  31 #include "demuxer.h"
  32 #include "mp_msg.h"
  33 #include "help_mp.h"
  34 #include "stheader.h"
  35
  36 muxer_t *muxer_new_muxer(int type,stream_t *stream){
  37     muxer_t* muxer=calloc(1,sizeof(muxer_t));
  38     if(!muxer)
  39         return NULL;
  40     muxer->stream = stream;
  41     switch (type) {
  42       case MUXER_TYPE_MPEG:
  43         if(! muxer_init_muxer_mpeg(muxer))
  44           goto fail;
  45         break;
  46       case MUXER_TYPE_RAWVIDEO:
  47         if(! muxer_init_muxer_rawvideo(muxer))
  48           goto fail;
  49         break;
  50       case MUXER_TYPE_RAWAUDIO:
  51         if(! muxer_init_muxer_rawaudio(muxer))
  52           goto fail;
  53         break;
  54 #ifdef CONFIG_LIBAVFORMAT
  55       case MUXER_TYPE_LAVF:
  56         if(! muxer_init_muxer_lavf(muxer))
  57           goto fail;
  58         break;
  59 #endif
  60       case MUXER_TYPE_AVI:
  61       default:
  62         if(! muxer_init_muxer_avi(muxer))
  63           goto fail;
  64     }
  65     return muxer;
  66
  67 fail:
  68     free(muxer);
  69     return NULL;
  70 }
  71
  72 /* buffer frames until we either:
  73  * (a) have at least one frame from each stream
  74  * (b) run out of memory */
  75 void muxer_write_chunk(muxer_stream_t *s, size_t len, unsigned int flags, double dts, double pts) {
  76     if(dts == MP_NOPTS_VALUE) dts= s->timer;
  77     if(pts == MP_NOPTS_VALUE) pts= s->timer; // this is wrong
  78
  79     if (s->muxer->muxbuf_skip_buffer) {
  80       s->muxer->cont_write_chunk(s, len, flags, dts, pts);
  81     }
  82     else {
  83       int num = s->muxer->muxbuf_num++;
  84       muxbuf_t *buf, *tmp;
  85
  86       tmp = realloc_struct(s->muxer->muxbuf, (num+1), sizeof(muxbuf_t));
  87       if(!tmp) {
  88         mp_msg(MSGT_MUXER, MSGL_FATAL, MSGTR_MuxbufReallocErr);
  89         return;
  90       }
  91       s->muxer->muxbuf = tmp;
  92       buf = s->muxer->muxbuf + num;
  93
  94       /* buffer this frame */
  95       buf->stream = s;
  96       buf->dts= dts;
  97       buf->pts= pts;
  98       buf->len = len;
  99       buf->flags = flags;
 100       buf->buffer = malloc(len);
 101       if (!buf->buffer) {
 102         mp_msg(MSGT_MUXER, MSGL_FATAL, MSGTR_MuxbufMallocErr);
 103         return;
 104       }
 105       memcpy(buf->buffer, s->buffer, buf->len);
 106       s->muxbuf_seen = 1;
 107
 108       /* see if we need to keep buffering */
 109       s->muxer->muxbuf_skip_buffer = 1;
 110       for (num = 0; s->muxer->streams[num]; ++num)
 111         if (!s->muxer->streams[num]->muxbuf_seen)
 112           s->muxer->muxbuf_skip_buffer = 0;
 113
 114       /* see if we can flush buffer now */
 115       if (s->muxer->muxbuf_skip_buffer) {
 116         mp_msg(MSGT_MUXER, MSGL_V, MSGTR_MuxbufSending, s->muxer->muxbuf_num);
 117
 118         /* fix parameters for all streams */
 119         for (num = 0; s->muxer->streams[num]; ++num) {
 120           muxer_stream_t *str = s->muxer->streams[num];
 121           if(str->muxer->fix_stream_parameters)
 122             muxer_stream_fix_parameters(str->muxer, str);
 123         }
 124
 125         /* write header */
 126         if (s->muxer->cont_write_header)
 127           muxer_write_header(s->muxer);
 128
 129         /* send all buffered frames to muxer */
 130         for (num = 0; num < s->muxer->muxbuf_num; ++num) {
 131           muxbuf_t tmp_buf;
 132           buf = s->muxer->muxbuf + num;
 133           s = buf->stream;
 134
 135           /* 1. save timer and buffer (might have changed by now) */
 136           tmp_buf.dts = s->timer;
 137           tmp_buf.buffer = s->buffer;
 138
 139           /* 2. move stored timer and buffer into stream and mux it */
 140           s->timer = buf->dts;
 141           s->buffer = buf->buffer;
 142           s->muxer->cont_write_chunk(s, buf->len, buf->flags, buf->dts, buf->pts);
 143
 144           /* 3. restore saved timer and buffer */
 145           s->timer = tmp_buf.dts;
 146           s->buffer = tmp_buf.buffer;
 147         }
 148
 149         free(s->muxer->muxbuf);
 150         s->muxer->muxbuf_num = 0;
 151       }
 152     }
 153
 154     /* this code moved directly from muxer_avi.c */
 155     // alter counters:
 156     if(s->h.dwSampleSize){
 157       // CBR
 158       s->h.dwLength+=len/s->h.dwSampleSize;
 159       if(len%s->h.dwSampleSize) mp_msg(MSGT_MUXER, MSGL_WARN, MSGTR_WarningLenIsntDivisible);
 160     } else {
 161       // VBR
 162       s->h.dwLength++;
 163     }
 164     s->timer=(double)s->h.dwLength*s->h.dwScale/s->h.dwRate;
 165     s->size+=len;
 166
 167     return;
 168 }
 169