int a52_fillbuff(sh_audio_t *sh_audio){ int length=0; int flags=0; int sample_rate=0; int bit_rate=0; sh_audio->a_in_buffer_len=0; /* sync frame:*/ while(1){ while(sh_audio->a_in_buffer_len<8){ int c=demux_getc(sh_audio->ds); if(c<0) return -1; /* EOF*/ sh_audio->a_in_buffer[sh_audio->a_in_buffer_len++]=c; } if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8); length = a52_syncinfo (sh_audio->a_in_buffer, &flags, &sample_rate, &bit_rate); if(length>=7 && length<=3840) break; /* we're done.*/ /* bad file => resync*/ if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer,sh_audio->a_in_buffer,8); memmove(sh_audio->a_in_buffer,sh_audio->a_in_buffer+1,7); --sh_audio->a_in_buffer_len; } mp_msg(MSGT_DECAUDIO,MSGL_DBG2,"a52: len=%d flags=0x%X %d Hz %d bit/s\n",length,flags,sample_rate,bit_rate); sh_audio->samplerate=sample_rate; sh_audio->i_bps=bit_rate/8; sh_audio->samplesize=sh_audio->sample_format==AF_FORMAT_FLOAT_NE ? 4 : 2; demux_read_data(sh_audio->ds,sh_audio->a_in_buffer+8,length-8); if(sh_audio->format!=0x2000) swab(sh_audio->a_in_buffer+8,sh_audio->a_in_buffer+8,length-8); if(crc16_block(sh_audio->a_in_buffer+2,length-2)!=0) mp_msg(MSGT_DECAUDIO,MSGL_STATUS,"a52: CRC check failed! \n"); return length; }
// return: packet length int read_video_packet(demux_stream_t *ds){ int packet_start; int res, read; if (VIDEOBUFFER_SIZE - videobuf_len < 5) return 0; // SYNC STREAM // if(!sync_video_packet(ds)) return 0; // cannot sync (EOF) // COPY STARTCODE: packet_start=videobuf_len; videobuffer[videobuf_len+0]=0; videobuffer[videobuf_len+1]=0; videobuffer[videobuf_len+2]=1; videobuffer[videobuf_len+3]=next_nal; videobuf_len+=4; // READ PACKET: res = demux_pattern_3(ds, &videobuffer[videobuf_len], VIDEOBUFFER_SIZE - videobuf_len, &read, 0x100); videobuf_len += read; if (!res) goto eof_out; videobuf_len-=3; mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: packet 0x1%02X len=%d (total=%d)\n",videobuffer[packet_start+3],videobuf_len-packet_start,videobuf_len); // Save next packet code: next_nal = demux_getc(ds); if (next_nal < 0) goto eof_out; videobuf_code_len=4; return videobuf_len-packet_start; eof_out: next_nal = -1; videobuf_code_len = 0; return videobuf_len - packet_start; }
// sync video stream, and returns next packet code int sync_video_packet(demux_stream_t *ds){ if (!videobuf_code_len) { int skipped=0; if (!demux_pattern_3(ds, NULL, MAX_SYNCLEN, &skipped, 0x100)) { if (skipped == MAX_SYNCLEN) mp_msg(MSGT_DEMUXER, MSGL_ERR, "parse_es: could not sync video stream!\n"); goto eof_out; } next_nal = demux_getc(ds); if (next_nal < 0) goto eof_out; videobuf_code_len = 4; if(skipped) mp_dbg(MSGT_PARSEES,MSGL_DBG2,"videobuf: %d bytes skipped (next: 0x1%02X)\n",skipped,next_nal); } return 0x100|next_nal; eof_out: next_nal = -1; videobuf_code_len = 0; return 0; }