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