libmpdemux/muxer.c

   1
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <string.h>
   5 #include <inttypes.h>
   6 #include <unistd.h>
   7
   8 #include "config.h"
   9 #include "version.h"
  10
  11 #include "aviheader.h"
  12 #include "ms_hdr.h"
  13
  14 #include "stream/stream.h"
  15 #include "muxer.h"
  16 #include "demuxer.h"
  17 #include "mp_msg.h"
  18 #include "help_mp.h"
  19 #include "stheader.h"
  20
  21 muxer_t *muxer_new_muxer(int type,stream_t *stream){
  22     muxer_t* muxer=calloc(1,sizeof(muxer_t));
  23     if(!muxer)
  24         return NULL;
  25     muxer->stream = stream;
  26     switch (type) {
  27       case MUXER_TYPE_MPEG:
  28         if(! muxer_init_muxer_mpeg(muxer))
  29           goto fail;
  30         break;
  31       case MUXER_TYPE_RAWVIDEO:
  32         if(! muxer_init_muxer_rawvideo(muxer))
  33           goto fail;
  34         break;
  35       case MUXER_TYPE_RAWAUDIO:
  36         if(! muxer_init_muxer_rawaudio(muxer))
  37           goto fail;
  38         break;
  39 #ifdef USE_LIBAVFORMAT
  40       case MUXER_TYPE_LAVF:
  41         if(! muxer_init_muxer_lavf(muxer))
  42           goto fail;
  43         break;
  44 #endif
  45       case MUXER_TYPE_AVI:
  46       default:
  47         if(! muxer_init_muxer_avi(muxer))
  48           goto fail;
  49     }
  50     return muxer;
  51
  52 fail:
  53     free(muxer);
  54     return NULL;
  55 }
  56
  57 /* buffer frames until we either:
  58  * (a) have at least one frame from each stream
  59  * (b) run out of memory */
  60 void muxer_write_chunk(muxer_stream_t *s, size_t len, unsigned int flags, double dts, double pts) {
  61     if(dts == MP_NOPTS_VALUE) dts= s->timer;
  62     if(pts == MP_NOPTS_VALUE) pts= s->timer; // this is wrong
  63
  64     if (s->muxer->muxbuf_skip_buffer) {
  65       s->muxer->cont_write_chunk(s, len, flags, dts, pts);
  66     }
  67     else {
  68       int num = s->muxer->muxbuf_num++;
  69       muxbuf_t *buf, *tmp;
  70
  71       tmp = realloc_struct(s->muxer->muxbuf, (num+1), sizeof(muxbuf_t));
  72       if(!tmp) {
  73         mp_msg(MSGT_MUXER, MSGL_FATAL, MSGTR_MuxbufReallocErr);
  74         return;
  75       }
  76       s->muxer->muxbuf = tmp;
  77       buf = s->muxer->muxbuf + num;
  78
  79       /* buffer this frame */
  80       buf->stream = s;
  81       buf->dts= dts;
  82       buf->pts= pts;
  83       buf->len = len;
  84       buf->flags = flags;
  85       buf->buffer = malloc(len);
  86       if (!buf->buffer) {
  87         mp_msg(MSGT_MUXER, MSGL_FATAL, MSGTR_MuxbufMallocErr);
  88         return;
  89       }
  90       memcpy(buf->buffer, s->buffer, buf->len);
  91       s->muxbuf_seen = 1;
  92
  93       /* see if we need to keep buffering */
  94       s->muxer->muxbuf_skip_buffer = 1;
  95       for (num = 0; s->muxer->streams[num]; ++num)
  96         if (!s->muxer->streams[num]->muxbuf_seen)
  97           s->muxer->muxbuf_skip_buffer = 0;
  98
  99       /* see if we can flush buffer now */
 100       if (s->muxer->muxbuf_skip_buffer) {
 101         mp_msg(MSGT_MUXER, MSGL_V, MSGTR_MuxbufSending, s->muxer->muxbuf_num);
 102
 103         /* fix parameters for all streams */
 104         for (num = 0; s->muxer->streams[num]; ++num) {
 105           muxer_stream_t *str = s->muxer->streams[num];
 106           if(str->muxer->fix_stream_parameters)
 107             muxer_stream_fix_parameters(str->muxer, str);
 108         }
 109
 110         /* write header */
 111         if (s->muxer->cont_write_header)
 112           muxer_write_header(s->muxer);
 113
 114         /* send all buffered frames to muxer */
 115         for (num = 0; num < s->muxer->muxbuf_num; ++num) {
 116           muxbuf_t tmp_buf;
 117           buf = s->muxer->muxbuf + num;
 118           s = buf->stream;
 119
 120           /* 1. save timer and buffer (might have changed by now) */
 121           tmp_buf.dts = s->timer;
 122           tmp_buf.buffer = s->buffer;
 123
 124           /* 2. move stored timer and buffer into stream and mux it */
 125           s->timer = buf->dts;
 126           s->buffer = buf->buffer;
 127           s->muxer->cont_write_chunk(s, buf->len, buf->flags, buf->dts, buf->pts);
 128
 129           /* 3. restore saved timer and buffer */
 130           s->timer = tmp_buf.dts;
 131           s->buffer = tmp_buf.buffer;
 132         }
 133
 134         free(s->muxer->muxbuf);
 135         s->muxer->muxbuf_num = 0;
 136       }
 137     }
 138
 139     /* this code moved directly from muxer_avi.c */
 140     // alter counters:
 141     if(s->h.dwSampleSize){
 142       // CBR
 143       s->h.dwLength+=len/s->h.dwSampleSize;
 144       if(len%s->h.dwSampleSize) mp_msg(MSGT_MUXER, MSGL_WARN, MSGTR_WarningLenIsntDivisible);
 145     } else {
 146       // VBR
 147       s->h.dwLength++;
 148     }
 149     s->timer=(double)s->h.dwLength*s->h.dwScale/s->h.dwRate;
 150     s->size+=len;
 151
 152     return;
 153 }
 154