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 "stheader.h"
  34
  35 muxer_t *muxer_new_muxer(int type,stream_t *stream){
  36     muxer_t* muxer=calloc(1,sizeof(muxer_t));
  37     if(!muxer)
  38         return NULL;
  39     muxer->stream = stream;
  40     switch (type) {
  41       case MUXER_TYPE_MPEG:
  42         if(! muxer_init_muxer_mpeg(muxer))
  43           goto fail;
  44         break;
  45       case MUXER_TYPE_RAWVIDEO:
  46         if(! muxer_init_muxer_rawvideo(muxer))
  47           goto fail;
  48         break;
  49       case MUXER_TYPE_RAWAUDIO:
  50         if(! muxer_init_muxer_rawaudio(muxer))
  51           goto fail;
  52         break;
  53 #ifdef CONFIG_LIBAVFORMAT
  54       case MUXER_TYPE_LAVF:
  55         if(! muxer_init_muxer_lavf(muxer))
  56           goto fail;
  57         break;
  58 #endif
  59       case MUXER_TYPE_AVI:
  60       default:
  61         if(! muxer_init_muxer_avi(muxer))
  62           goto fail;
  63     }
  64     return muxer;
  65
  66 fail:
  67     free(muxer);
  68     return NULL;
  69 }
  70
  71 /* buffer frames until we either:
  72  * (a) have at least one frame from each stream
  73  * (b) run out of memory */
  74 void muxer_write_chunk(muxer_stream_t *s, size_t len, unsigned int flags, double dts, double pts) {
  75     if(dts == MP_NOPTS_VALUE) dts= s->timer;
  76     if(pts == MP_NOPTS_VALUE) pts= s->timer; // this is wrong
  77
  78     if (s->muxer->muxbuf_skip_buffer) {
  79       s->muxer->cont_write_chunk(s, len, flags, dts, pts);
  80     }
  81     else {
  82       int num = s->muxer->muxbuf_num++;
  83       muxbuf_t *buf, *tmp;
  84
  85       tmp = realloc_struct(s->muxer->muxbuf, (num+1), sizeof(muxbuf_t));
  86       if(!tmp) {
  87         mp_tmsg(MSGT_MUXER, MSGL_FATAL, "Muxer frame buffer cannot reallocate memory!\n");
  88         return;
  89       }
  90       s->muxer->muxbuf = tmp;
  91       buf = s->muxer->muxbuf + num;
  92
  93       /* buffer this frame */
  94       buf->stream = s;
  95       buf->dts= dts;
  96       buf->pts= pts;
  97       buf->len = len;
  98       buf->flags = flags;
  99       buf->buffer = malloc(len);
 100       if (!buf->buffer) {
 101         mp_tmsg(MSGT_MUXER, MSGL_FATAL, "Muxer frame buffer cannot allocate memory!\n");
 102         return;
 103       }
 104       memcpy(buf->buffer, s->buffer, buf->len);
 105       s->muxbuf_seen = 1;
 106
 107       /* see if we need to keep buffering */
 108       s->muxer->muxbuf_skip_buffer = 1;
 109       for (num = 0; s->muxer->streams[num]; ++num)
 110         if (!s->muxer->streams[num]->muxbuf_seen)
 111           s->muxer->muxbuf_skip_buffer = 0;
 112
 113       /* see if we can flush buffer now */
 114       if (s->muxer->muxbuf_skip_buffer) {
 115         mp_tmsg(MSGT_MUXER, MSGL_V, "Muxer frame buffer sending %d frame(s) to the muxer.\n", s->muxer->muxbuf_num);
 116
 117         /* fix parameters for all streams */
 118         for (num = 0; s->muxer->streams[num]; ++num) {
 119           muxer_stream_t *str = s->muxer->streams[num];
 120           if(str->muxer->fix_stream_parameters)
 121             muxer_stream_fix_parameters(str->muxer, str);
 122         }
 123
 124         /* write header */
 125         if (s->muxer->cont_write_header)
 126           muxer_write_header(s->muxer);
 127
 128         /* send all buffered frames to muxer */
 129         for (num = 0; num < s->muxer->muxbuf_num; ++num) {
 130           muxbuf_t tmp_buf;
 131           buf = s->muxer->muxbuf + num;
 132           s = buf->stream;
 133
 134           /* 1. save timer and buffer (might have changed by now) */
 135           tmp_buf.dts = s->timer;
 136           tmp_buf.buffer = s->buffer;
 137
 138           /* 2. move stored timer and buffer into stream and mux it */
 139           s->timer = buf->dts;
 140           s->buffer = buf->buffer;
 141           s->muxer->cont_write_chunk(s, buf->len, buf->flags, buf->dts, buf->pts);
 142
 143           /* 3. restore saved timer and buffer */
 144           s->timer = tmp_buf.dts;
 145           s->buffer = tmp_buf.buffer;
 146         }
 147
 148         free(s->muxer->muxbuf);
 149         s->muxer->muxbuf_num = 0;
 150       }
 151     }
 152
 153     /* this code moved directly from muxer_avi.c */
 154     // alter counters:
 155     if(s->h.dwSampleSize){
 156       // CBR
 157       s->h.dwLength+=len/s->h.dwSampleSize;
 158       if(len%s->h.dwSampleSize) mp_tmsg(MSGT_MUXER, MSGL_WARN, "Warning, len isn't divisible by samplesize!\n");
 159     } else {
 160       // VBR
 161       s->h.dwLength++;
 162     }
 163     s->timer=(double)s->h.dwLength*s->h.dwScale/s->h.dwRate;
 164     s->size+=len;
 165
 166     return;
 167 }